970 research outputs found
Camp Century: Firn temperature measurements (CEN-THM)
No full textFirn temperature data at Camp Century (CEN-THM)
Project leader:
William Colgan ([email protected])
Contact:
Baptiste Vandecrux ([email protected])
Please cite the following study when using these data:
Vandecrux, B., Colgan, W., Solgaard, A.M., Steffensen, J.P., and Karlsson, N.B.(2021). Firn evolution at Camp Century, Greenland: 1966-2100, Frontiers in Earth Science, https://doi.org/10.3389/feart.2021.578978, 2021
Initial sensor depth (in meters) for the long string:
0 2 4 6 8 10 12 14 16 18 21 24 27 30 33 36 39 42 45 48 53 58 63 68 73
Initial sensor depth (in meters) for the short string:
0 1 2 3 4 5 6 7 8 9 11 13 15 17 19 22 25 28 31 34 38 42 46 50 54
Format:
comma separated
first column is the time stamp, the others are firn temperature in degree Celsius
Temporal coverage:
2017-07-26 to 2025-12-09<br
Camp Century: Simulations of firn evolution 1966-2100
No full textThis dataset contains the meteorological forcing, calculated surface energy and mass balance and simulated firn evolution at Camp Century during 1966-2100.
Contact:
Baptiste Vandecrux ([email protected])
Please cite the following study when using these data:
Vandecrux, B., Colgan, W., Solgaard, A.M., Steffensen, J.P., and Karlsson, N.B.(2021). Firn evolution at Camp Century, Greenland: 1966-2100, Frontiers in Earth Science, https://doi.org/10.3389/feart.2021.578978, 202
Camp Century: Firn compaction measurements (CEN-COM)
No full textFirn compaction measurements at Camp Century (CEN-COM)
Contact:
Baptiste Vandecrux ([email protected])
Please cite the following study when using these data:
Vandecrux, B., Colgan, W., Solgaard, A.M., Steffensen, J.P., and Karlsson, N.B.(2021). Firn evolution at Camp Century, Greenland: 1966-2100, Frontiers in Earth Science, https://doi.org/10.3389/feart.2021.578978, 2021
Location:
77.18N -61.11E 1886 m a.s.l
Temporal coverage: 2017-08-01 to 2020-01-19
Temporal resolution: daily snapshots
Instrument design:
The instrument were designed by Mike MacFerrin ([email protected]) after “coffee-can” method (Hulbe and Whillans, 1994; Hamilton et al., 1998) to continuously monitor firn compaction, similar to the method used by Arthern et al. (2010). Each instrument is composed of a line with a weight attached to one end and connected to a spring-loaded potentiometer on the other end. The weight is anchored at the bottom of a borehole, and the potentiometer is placed at the top of the borehole. As the borehole shortens due to firn compaction, the potentiometer reels in the string to maintain tension, and a data logger records the length of string that has been reeled in.
The CEN-COM station was first introduced by Colgan et al. (2018) and then described and used in Vandecrux et al. (2021). Please consider citing these two studies if using this data.
References:
Arthern, R.J., Vaughan, D.G., Rankin, A.M., Mulvaney, R., and Thomas, E.R. (2010). In situ measurements of Antarctic snow compaction compared with predictions of models. J. Geophys. Res. 115, 12 PP.
Colgan, W., Pedersen, A., Binder, D., Machguth, H., Abermann, J., and Jayred, M. (2018). Initial field activities of the camp century climate monitoring programme in Greenland. Geol. Surv. of Denmark Greenland Bull. 41, 75–78. doi:10.34194/geusb.v41.4347
Hamilton, G.S., and Whillans, I.M. (2002). Local rates of ice-sheet thickness change in Greenland. Ann. Glaciol. 35, 79–83.
Hulbe, C., & Whillans, I. (1994). A method for determining ice-thickness change at remote locations using GPS. Annals of Glaciology, 20, 263-268. doi:10.3189/1994AoG20-1-263-268
Vandecrux, B., Colgan, W., Solgaard, A.M., Steffensen, J.P., and Karlsson, N.B.(2021). Firn evolution at Camp Century, Greenland: 1966-2100, Frontiers in Earth Science, https://doi.org/10.3389/feart.2021.578978, 2021
Instrumental set up:
On 1st of August 2017, three instruments were installed:
Instrument #1: Top at 1.4 m depth, end of line at 62.3 m depth
Instrument #2: Top at 0.0 m depth, end of line at 20.0 m depth
Instrument #3: Top at 0.0m depth, end of line at 5.0 m depth
On the 16th of May 2019, these three intruments were unplugged and two new instruments were inserted:
Instrument #1: Top at 0.0 m depth, end of line at 4.9 m depth (+/- 0.2 m)
Instrument #2: Top at 0.0 m depth, end of line at 7.7 m depth (+/- 0.2 m)
Instrument #5 failed and did not record any data.
Field operators: Liam Colgan, Robert S. Fausto, Allan Ø. Pedersen
Data description:
This folder contains transmissions from the station modem.
The three useful columns are the last three: "INST_1_LENGTH_CORRECTED_M" (and INST_2, INST_3, respectively). This shows the length of the 2-m potentiometer cable over time.
To derive borehole length from these measurements, do this:
INIT_BOREHOLE_LEN = depth (m) of the borehole when it was first drilled at the instrument installed.
INIT_CABLE_LEN = length of the cable (m) at the first full day after the instrument was installed (can check your field notes, or just plot & look at the data to see when the trends begin), from the table
CURRENT_CABLE_LEN = length of the cable (m) on any subsequent day
CURRENT_BOREHOLE_LEN = length of the borehole (m) on any subsequent day
Calculate as such:
CURRENT_BOREHOLE_LEN = INIT_BOREHOLE_LEN - INIT_CABLE_LEN + CURRENT_CABLE_LEN
The first weeks of measurements can be affected by the initial settling of the instrument into the snow.<br
Cumberlandica wilsoniana Shea & Colgan & Stanisic 2012, n. sp.
No full text<i>Cumberlandica wilsoniana</i> n. sp. <p>(Figs 7G; 8G; 9G)</p> <p> <b>Etymology</b>. For the type locality.</p> <p> <b>Diagnosis</b>. Shell very small, light brown, biconcave with a strongly depressed spire and tightly coiled whorls, the last considerably expanded. Protoconch sculpture of prominent radial ribs and weak, closely spaced spiral lirae; teleoconch sculpture of numerous, widely spaced radial ribs and cancellate microsculpture. Umbilicus widely open, U-shaped.</p> <p> Type material examined. <b>Holotype.</b> QMMO42154, near Cathedral of Ferns picnic area, Blue Mountains National Park at Mt Wilson, northeast of Blackheath, Upper Blue Mountains, NSW (33° 30´S, 150° 23.96´E), 15.x.1992, coll. J. Stanisic, G. Ingram.</p> <p> <b>Description</b>. Shell very small, light-brown, biconcave with a strongly depressed spire. Whorls 4.25, tightly coiled, the last considerably expanded and descending in front. Sutures impressed. Shell diameter 4.29 mm, height 2.29, H/D 0.53. Protoconch flat, 1.0 whorls, diameter 0.41 mm. Protoconch sculpture consisting of low, spaced, narrow spiral threads and spaced radial ridges, becoming more pronounced toward the protoconch-teleoconch boundary. Teleoconch sculpture of numerous, prominent, quite uniformly spaced, slightly sinuate, orthocline radial ribs. Ribs on body whorl 103, width of interstices on the first teleoconch whorl equal to width of three to less than width of six ribs; on the penultimate whorl equal to width of four to less than six ribs; each rib with two or more overlapping periostracal blades. Interstitial sculpture of low prominent microradial ribs and low, weaker microspiral cords forming beads at their intersection; number of microradials between ribs on the first teleoconch whorl 8–10; on first quarter of body whorl 10–12; microspirals very low. Aperture broadly ovately-lunate. Parietal callus prominent, finely pustulose, transparent. Umbilicus wide U-shaped, diameter 1.22 mm, D/U 3.51. Based on one measured adult.</p> <p>Anatomy unknown.</p> <p> <b>Distribution and habitat</b>. Known only from the type locality at Mt Wilson, Blue Mountains, NSW; found in warm temperate rainforest on basaltic soil at altitude c. 900–1,000m, in litter under logs and rocks.</p> <p> <b>Remarks.</b> The single specimen of <i>Cu. wilsoniana</i> <b>n. sp.</b> was mistakenly thought to be conspecific with <i>Cu. impressa impressa</i> by Stanisic <i>et al</i>. (2010) on the basis of its general resemblance to the type of the species illustrated by Hedley (1924). However, detailed examination has revealed that it does not belong to that species. <i>Cu. wilsoniana</i> <b>n. sp.</b> is included in <i>Cumberlandica</i> on the basis of general shell features, pending further study. The protoconch of <i>Cu. wilsoniana</i> <b>n. sp.</b> has not been examined by SEM but optically it appears to consist of prominent radial ribs which extend over the entire protoconch surface and very insipid, closely spaced spiral lirae. These features combined with the broadly ovate aperture and inflated body whorl make its inclusion here rather tentative. In general shell morphology the species more closely resembles <i>Nautiliropa omicron</i> from far northern NSW and south-eastern Qld. The species has only been collected once in spite of additional searches in the type locality.</p>Published as part of <i>Shea, M., Colgan, D. J. & Stanisic, J., 2012, 3585, pp. 1-109 in Zootaxa 3585</i> on pages 32-3
Hipposideros wollastoni subsp. fasensis Flannery & Colgan 1993
No full text<p> <b> <i>Hipposideros wollastoni fasensis</i> Flannery & Colgan, 1993</b> </p> <p> <i>Rec. Aust. Mus.</i> 45(1): 52, figs 6–10, table 4. (19 March 1993).</p> <p> <b>Common name</b>. Wollaston’s Leaf-nosed Bat.</p> <p> <b>Current name</b>. <i>Hipposideros wollastoni fasensis</i> Flannery & Colgan, 1993; following Simmons (2005).</p> <p> <b>Holotype</b>. M.21876 by original designation. Female young adult, [Field no. FJ58], skull, body in alc., tongue in alc., frozen tissue; collected by T. F. Flannery, 26 February 1990, registered 20 June 1990.</p> <p> <b>Condition</b>. Cranium with fracture in left parietal; both dentaries complete; soft palate retained on skull. Body in alc.: broken left forearm and humerus, hole in left wing membrane between forearm and 5th digit.</p> <p> <b>Type locality</b>. At an alt. of 400–450 m on the hill south of the airstrip at 2Fas village (3°13'S 141°30'E), West Sepik Province, Papua New Guinea.</p> <p> <b>Comments</b>. Described from the holotype only; we are not aware of any subsequent records of the taxon. Provisionally recognized as a full species by Helgen (2007) but retained as a subspecies here, pending formal elevation to species.</p>Published as part of <i>Parnaby, Harry E., Ingleby, Sandy & Divljan, Anja, 2017, Type Specimens of Non-fossil Mammals in the Australian Museum, Sydney, pp. 277-420 in Records of the Australian Museum 69 (5)</i> on page 392, DOI: 10.3853/j.2201-4349.69.2017.1653, <a href="http://zenodo.org/record/5237800">http://zenodo.org/record/5237800</a>
Planorbacochlea hawkesburyana Shea & Colgan & Stanisic 2012, n. comb.
No full textPlanorbacochlea hawkesburyana (Stanisic, 2010) n. comb. (Figs 15B–D; 16B–D; 17B–D; 18A–C; 19B–D; 20F; 21F; 22F; 23F; 24E; 25A, B; 26A, B; 27C–G) Gyrocochlea hawkesburyana Stanisic, 2010: 196 (in Stanisic et al. 2010). Diagnosis. Shell very small, pale orange to cinnamon-brown, biconcave with weakly to strongly depressed spire. Protoconch sculpture strongly spiral consisting of 28 to 30, prominent, closely spaced, beaded spiral cords.Teleoconch sculpture of numerous, prominent, quite uniformly spaced, slightly sinuate, orthocline radial ribs. Ribs on body whorl 69–150. Umbilicus wide cup-shaped. Penis tubular, internally with a conical to loop-shaped apical verge and longitudinal pilasters tapering to the atrium; verge opening through a lateral slit Type material examined. Holotype. AM C.171393, Brooklyn, N side of Brooklyn Rd, Seymours Ck, ca. 100m from Pacific Hwy, NSW (33° 33’ 04” S, 151° 11’ 49” E), 7.viii.1983, coll. M. Shea. Paratypes. AM C.472883, same data as holotype. Other material examined. (All Sydney Basin, NSW) Brooklyn: AM C.346888, AM C.462512, AM C.462496. Turramurra: AM C.318933. Calna Creek: AM C319719, AM C.462434, AM C.462492, AM C.462515. Parriwi Park: AM C.462551, AM C.462552. Mount Wilson: AM C.26351, AM C.63749, AM C.140458, AM C.171394, AM C.360850, AM C.463091, QMMO 28769. Description. Shell very small, pale orange to cinnamon-brown, biconcave with weakly to strongly depressed spire. Whorls 3.12–4.12, tightly coiled, the last inflated and descending in front. Sutures strongly impressed. Shell diameter 2.60–3.68 mm (mean 3.13 mm), height 1.30–2.00 mm (mean 1.64 mm), H/D 0.45–0.55 (mean 0.52). Protoconch flat, of 1.25 whorls, diameter 0.37–0.60 mm. Protoconch sculpture strongly spiral consisting of 28 to 30, prominent, closely spaced, beaded spiral cords and weak closely spaced radial ridges becoming more pronounced toward the protoconch-teleoconch boundary. Teleoconch sculpture of numerous, prominent, quite uniformly spaced, slightly sinuate, orthocline radial ribs. Ribs on body whorl 69–150 (mean 98), width of interstices on the first teleoconch whorl greater than or equal to width of four and six ribs; on the penultimate whorl equal to width of four to less than six ribs;each rib with two or more overlapping periostracal blades. Interstitial sculpture of low prominent microradial ribs and low, weaker microspiral cords forming weak beads at their intersection; number of microradials between ribs on the first teleoconch whorl 5–8; on first quarter of body whorl 5–9; height of microspirals variable. Aperture broadly ovately-lunate. Parietal callus prominent, transparent. Umbilicus wide cup-shaped, diameter 0.76–1.12 mm (mean 0.95 mm), D/U 2.86–4.04 (mean 3.33). Based on 33 measured adults. Reproductive organs with ovotestis containing two clumps of alveoli, with more than two alveolar lobes per clump. Hermaphroditic duct narrow crescent-shaped. Spermatheca with a medium to large-sized oval bulb.Talon large, circular or oval shaped. Penial retractor muscle less than half the length of penis, inserting at the junction of the penis and epiphallus. Epiphallus equal or subequal in length to the penis. Penis tubular, internally with a conical to loop shaped apical verge and longitudinal pilasters tapering to the atrium; verge opening through a lateral slit. Vagina shorter than penis. Distribution and habitat. Broken Bay (Brooklyn), and Middle Harbour, Port Jackson to Mt Wilson, Sydney Basin, NSW; found in dense sclerophyll forest, dry rainforest and warm temperate rainforest, particularly in gullies and along watercourses, living under rocks and logs. Remarks. P. hawkesburyana is similar to P. watagan n. sp. in shell morphology but differs most noticeably in having fewer ribs on the teleoconch There is considerable variability in spire depression and rib spacing on the teleoconch of the various samples of P. hawkesburyana. This may be environmentally-induced variability or reflect on-going lineage differentiation in isolated populations. In particular, the Brooklyn site is distinguished from the others of the species in verge anatomy. In Brooklyn specimens, this is an open sculptured loop or scoop-shaped structure fused to the wall of the penis just below the epiphallus entry, whereas specimens from other sites have a bud-shaped papilla with internal parallel ridges inside the penis. Shells from this site also have more widely spaced and stronger radial ribs on the teleoconch and finer spiral threads on the protoconch. The various specimens for which DNA material was available were shown to be genetically conspecific.Published as part of Shea, M., Colgan, D. J. & Stanisic, J., 2012, 3585, pp. 1-109 in Zootaxa 3585 on pages 37-4
Richmondaropa prava Shea & Colgan & Stanisic 2012, n. comb.
No full textRichmondaropa prava (Hedley, 1924) n. comb. (Figs 30B, C; 32B. C; 34B, C; 36B, C; 38A, B; 39F, G; 40F; 41E, F) Gyrocochlea prava Hedley, 1924: 217. Gyrocochlea prava: Iredale 1937: 323; Iredale 1941a: 268; Smith 1992: 191; Stanisic et al. 2010: 200. Diagnosis. Shell very small, cinnamon brown, biconcave with weakly depressed spire. Protoconch sculpture primarily spiral consisting of 21 prominent, widely spaced, narrow, continuous spiral cords; vague, very weak, underlying radial ridges present. Teleoconch sculpture of numerous, prominent, quite uniformly spaced, slightly sinuate, strongly prosocline radial ribs. Ribs on body whorl 100–117 (mean 104). Umbilicus wide U-shaped to cupshaped. Epiphallus longer than penis, entering penis through a simple pore (verge absent). Penis tubular with an expanded apical portion, internally with 2–3 longitudinal pilasters. Type material examined. Holotype. AM C63491, Upper Tweed River, NSW, coll. W. Petterd. Paratypes. AM C.103621, same data as holotype. Other material examined. NSW-Booyong Nature Reserve: AM C.140225, QMMO 17066. Richmond Range: QMMO 6273, QMMO 10909/ AM C.128499, QMMO 49123. Stotts Island: QMMO 10517, QMMO 78719. Lismore: QMMO 19824, QMMO 77015. Qld-Currumbin Valley: AM C.339711. Description. Shell very small, cinnamon brown, biconcave with weakly depressed spire. Whorls 3.62–4.5 (mean 4.00), tightly coiled, the last weakly expanding and strongly descending in front. Sutures strongly impressed. Shell diameter 3.59–3.93 mm (mean 3.77 mm), height 1.99–2.17 mm (mean 2.09 mm), H/D 0.48–0.77 (mean 0.55). Protoconch flat, of 1.12 whorls, diameter 0.56–0.67 mm. Protoconch sculpture primarily spiral consisting of 21 prominent, widely spaced, narrow, continuous spiral cords; underlying weak radial ridges present. Teleoconch sculpture of numerous, prominent, quite uniformly spaced, slightly sinuate, strongly prosocline radial ribs. Ribs on body whorl 100–117 (mean 104), width of interstices on the first teleoconch whorl equal to width of four to greater than or equal to width of six ribs; on the penultimate whorl equal to width of four to equal to width of six ribs; each rib with single periostracal blade. Interstitial sculpture of low prominent microradial ribs and low, weaker microspiral cords forming weak beads at their intersection; number of microradials between ribs on the first teleoconch whorl 5–8; on first quarter of body whorl 9–10. Aperture broadly ovately-lunate. Parietal callus prominent, transparent. Umbilicus wide U shaped to cup-shaped, diameter 0.82–1.32 mm (mean 1.04 mm), D/U 2.65–4.40 (mean 3.56). Based on 25 measured adults. Reproductive tract with ovotestis containing two clumps of alveoli, with more than two alveolar lobes per clump. Hermaphroditic duct corrugated, crescent-shaped. Spermatheca with a medium-sized circular bulb. Penial retractor muscle inserting on top of penis at the junction of the penis and epiphallus. Epiphallus longer than penis, entering penis through a simple pore (i.e. verge absent). Penis tubular with an expanded apical portion, internally with 2–3 longitudinal pilasters. Vagina shorter than penis. Atrium short. Distribution and habitat. Richmond River to the Border Ranges, north-eastern NSW; found in lowland to mid-altitude rainforest and vine thicket, living under logs. Remarks: Richmondaropa prava (Hedley, 1924) n. comb. is distinguished from the more coastal and parapatric Richmondaropa conjuncta (Iredale, 1941) n. comb. by its larger size, less tightly coiled whorls and more crowded and numerous radial ribs on the teleoconch. R. prava differs from the broadly sympatric Dictyoropa eurythma chiefly by the protoconch sculpture which in R. prava primarily consists of widely spaced, narrow spiral cords in contrast to the broadly reticulate pattern of D. eurythma. Radial elements are present on the protoconch of R. prava but these take the form of weak underlying growth ridges.Published as part of Shea, M., Colgan, D. J. & Stanisic, J., 2012, 3585, pp. 1-109 in Zootaxa 3585 on pages 82-8
Richmondaropa conjuncta Shea & Colgan & Stanisic 2012, n. comb.
No full textRichmondaropa conjuncta (Iredale, 1941) n. comb. (Figs 30D, E; 32D, E; 34D, E; 36D, E; 38C, D) Roblinella conjuncta Iredale, 1941b: 1; Iredale 1941a: 268 (illustration only). Roblinella conjuncta: Smith 1992: 203. Gyrocochlea conjuncta (Iredale): Stanisic et al. 2010: 200. Type locality. Byron Bay, NSW. Diagnosis. Shell very small, cinnamon brown, planispiral with flat to slightly depressed spire. Protoconch sculpture primarily spiral consisting of 17 prominent, widely spaced, narrow, continuous spiral cords; underlying weak radial ridges present. Teleoconch sculpture of numerous, prominent, quite uniformly spaced, slightly sinuate, orthocline to weakly prosocline radial ribs. Ribs on body whorl 67–100 (mean 77). Umbilicus wide U-shaped to cup-shaped. Type material examined. Neotype (here designated) AM C.5311, Byron Bay, NSW (28° 39' S, 153° 37' E), 1908. Other material examined. Byron Bay: AM C.140243, AM C.472888. Brunswick Heads: QMMO 16789. Description. Shell very small, cinnamon-brown, planispiral with flat to slightly depressed spire. Whorls 3.50–4.25, tightly coiled, the last weakly expanding and strongly descending in front. Sutures strongly impressed. Shell diameter 3.46–4.04 mm (mean 3.74 mm), height 1.81–2.26 mm (mean 2.08 mm), H/D 0.50–0.59 (mean 0.55). Protoconch flat, of 1.12 whorls, diameter 0.56–0.67 mm. Protoconch sculpture primarily spiral consisting of 17 prominent, widely spaced, narrow, continuous spiral cords; underlying weak radial ridges present. Teleoconch sculpture of numerous, prominent, quite uniformly spaced, slightly sinuate, orthocline to weakly prosocline radial ribs. Ribs on body whorl 67–100 (mean 77), width of interstices on the first teleoconch whorl greater than or equal to width of six ribs; on the penultimate whorl greater than or equal to width of six ribs; each rib with one or more periostracal blades; with or without overlapping thickenings. Interstitial sculpture of low prominent microradial ribs and low, weaker microspiral cords forming weak beads at their intersection; number of microradials between ribs on the first teleoconch whorl 5–8; on first quarter of body whorl 13–17. Aperture broadly ovately-lunate. Parietal callus prominent, transparent. Umbilicus wide U-shaped to cup-shaped, diameter 0.80–1.16 mm (mean 0.99 mm), D/U 3.32–4.36 (mean 3.79). Based on 11 measured adults. Anatomy unknown. Distribution and habitat. Coastally in the Byron Bay region, north-eastern NSW; found in rainforest and vine thicket; living on underside of logs. Remarks. Iredale (1941) did not provide details about the protoconch of the type of Richmondaropa conjuncta n. comb. when he described the species. The type cannot now be located so that the protoconch sculpture cannot be determined. However, by assigning the species to Roblinella Iredale, 1937 (type: Helix roblini Petterd, 1879) Iredale identified this species as having a primarily spiral protoconch (see note below). Additionally, the comparatively low rib count for the body whorl (approx. 80) given by Iredale (1941b) is distinctive among the nautiliform charopids of north-eastern NSW. The illustration of the species, provided by that author in a publication (Iredale 1941a) preceding that in which the original description appeared (Iredale 1941b), clearly shows the wide rib spacing on the body whorl. Contemporary collections from the coastal rainforests around the Byron Bay area have discovered specimens which align quite closely with Iredale’s description. Hence, in order to stabilise this name a neotype is here designated from this recently collected material. R. conjuncta differs from R. prava by having more tightly coiled whorls and fewer, more widely spaced radial ribs on the teleoconch. This species may only be a regional variant of R. prava, however without DNA results and soft parts to study, full species status is retained pending further study. A second large undescribed planispiral charopid occurs sympatrically with R. conjuncta distinguished by more crowded teleoconch ribs, shallower whorls, wider umbilicus and a cancellate protoconch not dissimilar to ‘Gyrocochlea’ species. A specimen identified as R. conjuncta from the Byron Bay-Brunswick Heads road in the Queensland Museum collections had a higher teleoconch rib count (100), compared to other specimens from the Byron Bay area (up to 90). It is here included with R. conjuncta based on its proximity to the Byron Bay site but may in fact be R. prava. Note. Four species from Tasmania (H. agnewi Legrand, 1871, H. curacoae Brazier, 1871, H. mathinnae Petterd, 1879, H. gadenensis Petterd, 1879), one from South Australia (R. speranda Iredale, 1937) and Endodonta intermedia Odhner, 1917 from the Atherton Tableland, north-eastern Queensland, were originally placed in Roblinella by Iredale (1937) on the basis of spirally lirate protoconch sculpture. Subsequently, R. conjuncta Iredale, 1941 from Northern New South Wales was also assigned to this genus. Stanisic et al. (2010) reassigned R. intermedia to Sinployea Solem, 1983. Here we have assigned R. conjuncta to Richmondaropa n. gen. Detailed examination of the micro-architecture of the protoconchs of the remaining Tasmanian representatives indicates that Roblinella still remains a polyphyletic taxon requiring revision (J. Stanisic unpublished data).Published as part of Shea, M., Colgan, D. J. & Stanisic, J., 2012, 3585, pp. 1-109 in Zootaxa 3585 on pages 83-8
The Effects of Climate Change on Economic Activity in Maine: Coastal York County Case Study
No full textClimate change can have significant ramifications for Maine’s economy. If short-term projections for the next century are accurate, at minimum sea level rise will become increasingly noticeable in association with more severe and destructive coastal storms. Charles Colgan and Samuel Merrill evaluate risk estimates by presenting a case study of the projected consequences of sea level rise and coastal storm damage on the economy of the state’s most vulnerable area, York County’s coastal communities
Planorbacochlea planorbis Shea & Colgan & Stanisic 2012, n. comb.
No full textPlanorbacochlea planorbis (Hedley, 1924) n. comb. (Figs 15G, H; 16G, H; 17G, H; 18F–H; 19G, H; 25C, D; 26C, D; 27H; 28A, B) Gyrocochlea planorbis Hedley, 1924: 217. Gyrocochlea planorbis: Iredale 1937: 323; Iredale 1941a: 268; Smith 1992: 191; Stanisic et al. 2010: 198 (in part). Diagnosis. Shell very small, coppery to orange brown, biconcave with weakly depressed spire. Protoconch sculpture spiral consisting of 24 to 36 prominent, closely spaced, beaded spiral cords and weak, closely spaced radial ridges becoming more pronounced toward the protoconch-teleoconch boundary. Teleoconch sculpture of numerous, prominent, quite uniformly spaced, slightly sinuate, orthocline to opisthocline radial ribs. Ribs on body whorl 75–138. Umbilicus open, U-shaped to wide cup-shaped. Penis club- or pear-shaped with a long tapering distal portion, apically with a scoop-like verge, with a terminal pore and approximately one third length of penis, longitudinal pilasters distally. Type material examined. Holotype. AM C.233, Port Stephens, NSW. Paratypes. AM C.103620, same data as holotype. Other material examined. Port Stephens: AM C.368601, AM C.462535, AM C.463729, AM C.464076, AM C.464083. Uffington State Forest: AM C.309904, AM C.309918, AM C.309923. Dungog: AM C.309910. Chichester State Forest: AM C.309908, AM C.309909, AM C.309916. Davis Creek: AM C.309164. Description. Shell very small, coppery to orange brown, biconcave with weakly depressed spire. Whorls 3.50–4.37, tightly coiled, the last inflated and descending in front. Sutures strongly impressed. Shell diameter 2.87–3.42 mm (mean 3.25 mm), height1.49–2.00 mm (mean 1.76 mm), H/D 0.48–0.54 (mean 0.51). Protoconch of 1–1.25 whorls, diameter 0.37–0.53 mm. Protoconch sculpture spiral consisting of 24 to 36 prominent, closely spaced, beaded spiral cords and weak, closely spaced radial ridges becoming more pronounced toward the protoconch-teleoconch boundary. Teleoconch sculpture of numerous, prominent, quite uniformly spaced, slightly sinuate, orthocline to opisthocline radial ribs. Ribs on body whorl 75–138 (mean 100), width of interstices on the first teleoconch whorl equal to width of four to equal to width of six ribs; on the penultimate whorl equal to width of four to less than six ribs; each rib with two or more overlapping periostracal blades. Interstitial sculpture of prominent microradial ribs and low, weaker microspiral cords forming weak beads at their intersection; number of microradials between ribs on the first teleoconch whorl 6–9; on first quarter of body whorl 7–9; height of microspirals variable. Aperture broadly ovately-lunate. Parietal callus prominent, transparent. Umbilicus open, Ushaped to wide cup-shaped, diameter 0.86–1.25 mm (mean 1.01 mm), D/U 2.98–3.64 (mean 3.31). Based on 29 measured adults. Reproductive tract with ovotestis containing two clumps of alveoli, with more than two alveolar lobes per clump. Hermaphroditic duct narrow to broad crescent-shaped. Spermatheca with a medium-sized oval bulb. Penial retractor muscle inserting at the junction of the penis and epiphallus. Epiphallus equal or shorter than penis entering penis through a verge. Penis club- or pear-shaped with a long tapering distal portion, apically with a scoop-like verge with a terminal pore and approximately one third length of penis; longitudinal pilasters distally. Vagina shorter than penis. Atrium short. Distribution and habitat. Port Stephens in the vicinity of Nelson Bay and Shoal Bay, to the upper Hunter Valley near Muswellbrook and the northern foothills of the Hunter Valley between Dungog, Clarencetown and Chichester State Forest, NSW; found in eucalypt forest and dry vine thickets, living under logs and rocks. Remarks. Planorbacochlea planorbis (Hedley, 1924) n. comb. has spiral protoconch sculpture somewhat similar to P. graemei from the Lake Macquarie area but is readily distinguished from that species by the greater number of ribs on the teleoconch. In contrast, P. manningensis n. sp., which occurs immediately to the north of P. planorbis in the Manning River drainage, generally has even more crowded ribs on the teleoconch. Port Stephens P. planorbis have a shell with a less sunken spire and more gradually increasing whorls compared to other specimens of the species with the exception of those from Davis Creek. Shells from sites around Uffington State Forest are smaller in size compared to the coastal Shoal Bay/ Nelson Bay P. planorbis, with fewer whorls and with the last whorl larger and more inflated.The Davis Creek site occurs much further inland than the other P. planorbis sites and no populations are known nearer than Dungog. The aperture is larger in area and ribs appear higher and more widely spaced in Davis Creek P. planorbis than in specimens from the Port Stephens area or from the Uffington State Forest, Marshdale and Main Creek sites. Anatomically P. planorbis differs from other species in the genus by the internal structure of the penis which exhibits complex transverse pilaster development around the epiphallic entrance and uppermost section of the penis. The anatomy of the verge could only be examined in the Uffington series. There may be a verge present in Port Stephens populations but this could not be determined from the single dissected specimen. The results of this study demonstrate that the definition of this taxon (as Gyrocochlea planorbis) given in Stanisic et al. (2010) was very broad and may have encompassed a number of very localised species rather than populations.Published as part of Shea, M., Colgan, D. J. & Stanisic, J., 2012, 3585, pp. 1-109 in Zootaxa 3585 on pages 50-5
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