1,354,481 research outputs found
What\u27s My Research? with Marie Lee and Zachary Stahlschmidt
No full textPlease join us on October 19th at noon at the Digital Wall in the Library (1st floor) for “What’s My Research?” presentations by Marie Lee and Zachary Stahlschmidt. Marie’s work focuses on preserving the cultural heritage of China\u27s Kam/Dong minority. Through a diverse range of media, including photographs, short films, videos, and written records, she has documented the Kam arts, crafts, and culture. Dr. Stahlschmidt is a behavioral and physiological ecologist. Students are integral to all aspects of his research group, and together they use insects to examine the effects of environmental change on animals.
A light lunch will be served
What\u27s My Research? with Marie Lee and Zachary Stahlschmidt
No full textPlease join us on October 19th at noon at the Digital Wall in the Library (1st floor) for “What’s My Research?” presentations by Marie Lee and Zachary Stahlschmidt. Marie’s work focuses on preserving the cultural heritage of China\u27s Kam/Dong minority. Through a diverse range of media, including photographs, short films, videos, and written records, she has documented the Kam arts, crafts, and culture. Dr. Stahlschmidt is a behavioral and physiological ecologist. Students are integral to all aspects of his research group, and together they use insects to examine the effects of environmental change on animals.
A light lunch will be served
Crassispira bruehli Stahlschmidt & Fraussen, 2014, n. sp.
No full textCrassispira bruehli n. sp. Figures 1–5 Type material. Holotype: MNHN IM- 2000-23314 (11.4 mm). Paratype 1: MNHN IM- 2000-23315 (11.2 mm). Paratypes 2–3: SMF- 336431 / 2 (9.8 mm, 9.8 mm). Paratypes 4–5: ANSP- 454324 (10.3 mm, 10.7 mm). Paratypes 6–11: PS- 020259 (9.3 mm, 10.1 mm, 10.6 mm, 11.1 mm, 11.5 mm, 11.5 mm). Paratype 12: KF (10.8 mm). Paratype 13: Conchology Inc. (10.2 mm). All from type locality. Type locality. Philippines, Palawan, Balabac Island, 15– 65 m. Distribution. Only known from the Palawan region. So far reported from Balabac Island (dredged at 15–65 m; type material), Puerto Princessa (dredged at 10–30 m; voucher specimens PS- 020289), Taytay Bay (dredged at 20–25 m; voucher specimens PS- 020290), and Port Barton (dredged at 20–25 m; voucher specimens PS- 020291). Description. Shell small to medium sized, up to 11.5 mm in length, b/l 0.37–0.40, a/l 0.36–0.40, narrowly claviform with narrow aperture; 6–7 teleoconch whorls; suture moderately deep, whorls moderately convex. Aperture narrowly pyriform with a very short, broad and deeply notched siphonal canal. Callus moderately strong, forming a rounded nodule in posterior angle of aperture, intruding to some degree into opening of anal sinus. Columella thin, smooth and glossy. Outer apertural lip thin, convex in side-view, crenulated, with a very weakly developed stromboid notch and a moderately deep, openly U-shaped anal sinus, which is directed slightly adapically. Fasciole weak and indistinct. Adult sculpture of stout, rounded axial ribs, commencing at the subsutural band and extending well over the base, overridden by spiral cords, 8–9 on first teleoconch whorl, 8–9 on penultimate whorl. No distinct varices, but the second last axial rib (situated about one-third whorl back from lip) being the strongest followed by a very weak axial rib behind lip. Spiral cords on spire whorls wide and flat, with very narrow interstices; a total of 5–7 on first teleoconch whorl to around 7 on penultimate whorl. Around 20 spiral cords on last whorl becoming somewhat narrower towards rostrum while interstices becoming gradually wider. Colour whitish-cream to light brown with moderate to dark brown axial streaks between axial ribs and in some cases diffuse brown markings on the last whorl, subsutural cord spotted with light to moderate brown, aperture and columella whitish-cream. Protoconch narrowly domed, of 1–1.5 whorls, first whorl depressed, second one weakly convex; suture shallow; white or cream tinged, smooth except for growth lines near termination, transition to teleoconch not well detectable. Radula (based on Paratype 1 MNHN- 23315; figs. 4–5) of the 1 -0-0- 0-1 type (following terminology of Kantor & Taylor, 2000). Marginal plates elongated, narrow, flattened distal end with well-defined, double cutting edges. No preserved soft parts and operculum available for study (the radula was extracted from a dried remnant found in one shell). Remarks. The true generic position of Crassispira bruehli n. sp. and C. pulchrepunctata Stahlschmidt & Bozzetti, 2007 is doubtful, and assignment to the genus Crassispira Swainson, 1840 (type species: Pleurotoma bottae Kiener, 1840 from eastern Pacific) is only tentative. The presence of broad and rounded axial ribs in combination with faint spiral cords is also found in several Crassispira species in the eastern Pacific such as C. ballenaensis Hertlein & Strong, 1951. The radula, however, with its well-defined, double cutting edges, is similar to radulae of members of the genus Funa Kilburn, 1988. Crassispira bruehli n. sp. is only remotely allied to C. pulchrepunctata Stahlschmidt & Bozzetti, 2007 (figures 6–7) and differs by its smaller size, denser axial sculpture, broader spiral cords, and different coloration. Etymology. Crassispira bruehli n. sp. is named in honour of Dr. Carsten Brühl in appreciation of his friendship and the intensive supervision of the first author’s doctoral thesis.Published as part of Stahlschmidt, Peter & Fraussen, Koen, 2014, Two new turrid species (Gastropoda: Pseudomelatomidae) from the Palawan region, the Philippines, pp. 89-93 in Zootaxa 3784 (1) on pages 89-91, DOI: 10.11646/zootaxa.3784.1.7, http://zenodo.org/record/28580
Inquisitor armillatus Stahlschmidt & Fraussen, 2014, n.sp.
No full textInquisitor armillatus n.sp. Figures 8–10 Type material. Holotype: MNHN IM- 2000-23316 (15.2 mm), Philippines, Palawan, Roxas, off Green Island Bay, 15– 35 m. Paratype 1: SMF- 336430 (12.8 mm), same locality as holotype. Paratypes 2–4: PS- 020260 (15.4 mm, 15.6 mm, 15.9 mm), same locality as holotype. Paratype 5: KF (13.7 mm), same locality as holotype. Paratypes 6–7: ANSP- 454323 (15.4 mm, 15.8 mm), Philippines, Palawan, Cuyo Island, 15– 25 m. Paratype 8: Conchology Inc. (14.8 mm), same locality as paratypes 6–7. Type locality. Philippines, Palawan, Roxas, off Green Island Bay, 15– 35 m. Distribution. Only known from the northeastern part of Palawan. So far reported from Green Island Bay (dredged at 15–35 m; type material), Cuyo Island (15–25 m, type material), and Taytay Bay (dredged at 20–25 m; voucher specimens PS- 020292). Description. Shell fairly small for the genus, up to 19.1 mm in length (specimen from Taytay Bay), b/l 0.34–0.37, a/l 0.36–0.42, narrowly claviform with narrow aperture; 7–8 teleoconch whorls; suture moderately deep, whorls moderately convex, barely shouldered. Aperture narrowly pyriform with a short, deeply notched siphonal canal. Callus moderately developed, forming a rounded nodule in posterior angle of aperture, not intruding into opening of anal sinus and hence scarcely constricting it. Columella thin, smooth and glossy. Fasciole moderately weak. Outer apertural lip thin, convex in side-view, crenulated, with a well-developed stromboid notch and a moderately deep, openly U-shaped anal sinus, which is directed slightly adapically. Sculptured by weak axial ribs, intervals about 2–3 times broader than axial ribs; 8–10 on first teleoconch whorl, 11– 12 on penultimate whorl (including varices), the last varix situated about on-third whorl back from lip. Spiral cords on spire whorls moderately wide and gently rounded, with equally wide interstices; a total of 3–5 on first teleoconch whorl to 8–11 on penultimate whorl. Spiral cords on last whorl becoming narrower towards rostrum while interstices becoming gradually wider. Colour whitish-cream with a light to dark brown spiral band situated above the suture at the abapical part of each teleoconch whorl. Last whorl with two bands, one at the first adapical third and the second one ending at the abapical part of the siphonal canal. Interior of aperture white tinged. Protoconch narrowly domed, of 2–2.5 whorls, first whorl depressed, second one weakly convex; suture shallow; white tinged, smooth except for very weak growth lines near termination. No soft parts or operculum available for study. Remarks. With its remarkable coloration, Inquisitor armillatus n. sp. remotely resembles the South African Inquisitor arctatus Kilburn, 1988 (Figs. 11–13) but the former species attains a much smaller size (around 15 mm compared to around 50 mm), has a shorter siphonal canal, a less pronounced parietal nodule, and fainter spiral cords. Etymology. The specific name is derived from the Latin expression armillatus meaning “wearing a bracelet” which refers to the dark brown colored spiral band.Published as part of Stahlschmidt, Peter & Fraussen, Koen, 2014, Two new turrid species (Gastropoda: Pseudomelatomidae) from the Palawan region, the Philippines, pp. 89-93 in Zootaxa 3784 (1) on pages 91-93, DOI: 10.11646/zootaxa.3784.1.7, http://zenodo.org/record/28580
Bathyferula, a new Caribbean deep-water turrid genus (Gastropoda: Turroidea), with description of a large-sized new species
No full textStahlschmidt, Peter, Lamy, Dominique, Fraussen, Koen (2012): Bathyferula, a new Caribbean deep-water turrid genus (Gastropoda: Turroidea), with description of a large-sized new species. Zootaxa 3158: 65-68, DOI: 10.5281/zenodo.21059
Benthofascis angularis Tucker & Tenorio & Stahlschmidt 2011, new species
No full textBenthofascis angularis new species Figures 2, A–D Type material. Holotype in MNHN 23067and paratype in P. Stahlschmidt collection both found among red and green algae, low limestone reef with some taller kelp, 12–15 m, Duke of Orleans Bay, Esperance, southwest Western Australia. Type locality. 30 m, off Cape le Grande, Esperance, southwest Western Australia. Range. Known only from Esperance, Western Australia. Description. Shell is small but is solid and ovate-fusiform. The holotype is 27.5 mm long and 11.1 mm wide. The paratype is 25.3 mm long and 11.0 mm wide. Color pattern consists of yellow bands over white. Three colored bands are present on the teleoconch whorls with one at the shoulder, one near midbody and the other at the anterior end. The midbody and anterior end bands may fuse into a single band. Spire is mostly white but a pale yellow band is located on the last teleoconch whorl. The holotype has 5.5 whorls including the protoconch. Sculpture on the protoconch consists of fine spirals. There are 4 or 5 spirals on the early sutural ramps of the teleoconch. The spirals are more pronounced than the axials, which appear to be enhanced growth lines. The number of spirals is reduced on the sutural ramps of the outer teleoconch whorls to two. Here, only growth lines cross the interspaces between the spirals. The body whorl is ornamented by spiral grooves. On the posterior half of the shell these grooves are widely spaced but they are set closer together on the anterior half of the body whorl. They are not overly distinct and best seen under magnification. The sides of the body whorl are slightly convex anterior to the shoulder angle. The shoulder is distinct almost carinate. The aperture is narrow with a deep sinus, the lip is thin, straight and is produced medially. Inner shell walls are resorbed (Fig. 2D). The columella is nearly straight but does have a medial prominence. There is also a groove near its posterior end just where the columella meets the body whorl. This forms a denticle inside the aperture. The anal sinus is not symmetrical and is deepest at the suture. The protoconch is paucispiral, blunt and swollen looking. The operculum is leaf-shaped with a terminal nucleus (Fig. 2A). It is fairly large and covers much of the apertural opening. The operculum of the holotype is 5.92 mm long. The radula was not observed. Discussion. This species can be distinguished from all other species of Benthofascis by the angular, almost carinate shoulder. In respect to the shell shape Benthofacies angularis is most similar to B. lozoueti. Both species are easily separated by the smooth body of B. angularis and the difference in the protoconch which is covered with minute and numerous spirals in B. lozoueti and only 5 spirals in B. angularis. In addition both species differ in respect to the inner whorls: in B. angularis the inner whorls are resorbed, but B. lozoueti appears to lack internal shell remodelling. The sutural ramps of early teleoconch whorls have reduced development of axials resembling B. pseudobiconica (Fig.2J). However, the shoulder of that species is much less angular than that of B. angularis. The shoulder of B. biconica (Figs. 1A & B) is subangular but not as angular as that of B. angularis. The latter species also differs in ornamentation of the sutural ramps of early teleoconch whorls from B. biconica. The spirals and axials on the sutural ramps of B. angularis are not strongly developed. On the outer sutural ramps simple growth lines replace the axials. In B. biconica, the spirals are much larger than the axials but the axials between adjacent spirals are much larger than are the growth lines. This species is also the only Benthofascis species collected from Western Australia. More importantly, the holotype was collected in only 12–15 m water depth. With only a few exceptions other species of Benthofascis occur in deeper water. Etymology. The name refers to the angular shoulders that characterize the species.Published as part of Tucker, J. K., Tenorio, M. J. & Stahlschmidt, P., 2011, The genus Benthofascis (Gastropoda: Conoidea): A revision with descriptions of new species, pp. 1-14 in Zootaxa 2796 (1) on pages 6-7, DOI: 10.11646/zootaxa.2796.1.1, http://zenodo.org/record/529015
FIGURES 8–9 in Bathyferula, a new Caribbean deep-water turrid genus (Gastropoda: Turroidea), with description of a large-sized new species
No full textFIGURES 8–9. Hindsiclava macilenta (Dall, 1889) 42.4 mm, Barbados, off St James, PSC-020162.Published as part of Stahlschmidt, Peter, Lamy, Dominique & Fraussen, Koen, 2012, Bathyferula, a new Caribbean deep-water turrid genus (Gastropoda: Turroidea), with description of a large-sized new species, pp. 65-68 in Zootaxa 3158 on page 67, DOI: 10.5281/zenodo.21059
The genus Benthofascis (Gastropoda: Conoidea): A revision with descriptions of new species
No full textTucker, J. K., Tenorio, M. J., Stahlschmidt, P. (2011): The genus Benthofascis (Gastropoda: Conoidea): A revision with descriptions of new species. Zootaxa 2796 (1): 1-14, DOI: 10.11646/zootaxa.2796.1.1, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.2796.1.
Benthofascis pseudobiconica Tucker & Tenorio & Stahlschmidt 2011, new species
No full text<i>Benthofascis pseudobiconica</i> new species <p>Figures 2, E–K; 4, E & F</p> <p> <b>Type material.</b> Holotype: MNHN 23069, 39.8mm x 12.8 mm, off Cape Moreton, Queensland, Australia. Paratypes: USNM 902891, 2 specimens from the Indian Ocean of South Australia; USNM 845059, 2 specimens from 80 fathoms, Stradbroke Island, Moreton Bay, Queensland, Australia; ANSP 424978, 4 specimens from 100 fathoms, off Cape Moreton, Queensland, Australia; ANSP 303729, 2 specimens from 80 fathoms, off Cape Moreton, Queensland, Australia; SMF 335128, 1 specimen from trawlers at 200 m, on sand and rubble, off Bundaberg, central coast of Queensland, Australia; SBMNH 424098, 1 specimen from shell dredge at 160 m, east of Mooloolaba, southern Queensland, Australia; Peter Stahlschmidt collection, 2 specimens from 100–120 m, off Capricorn Channel, Queensland, Australia; AMS C.110615, 2 specimens from 132–155 m, off Mooloolaba, Queensland, 26º40'S, 153º36'E; AMS C.392807, 2 specimens from 128–183 m, E of Caloundra, Queensland, 26º48'S, 153º, 35'E; AMS C.373105, 2 specimens from 71–77 m, 5.7 km E of Mistral Point, Sydney, New South Wales, 33º56.470'S, 151º19.630'E (wet).</p> <p> <b>Other specimens.</b> AMS C.383084, 4 specimens from 216–227 m, off Swain Reefs, off Hixson Cay, Queensland, 22º33'S, 153º26'E; AMS C.468236, 1 specimen from 115–176 m deep, East of Moreton Bay, Queensland, 26º55'S, 153º33'E, dredged 1969; AMS C.111073, 2 specimens from 201 m, off S end of Fraser Island, Queensland, 27º57'S, 153º51.050'E; AMS C.388791, 2 specimens from 66m, 5.6 km E of North Head, Sydney, New South Wales, 33º49.600S, 151º21.700E, dredged 18 January 1973, station SBS 21; AMS C.397151, 2 specimens from 128–137 m, off Tweed Heads, New South Wales, 28º19'S, 153º50'E; AMS 392811, 5 specimens from 187 m, SE of Swain Reefs, Queensland, 22º20.2'S, 153º17.130'E; AMS C.388787 3 specimens from 66 m, 5.6 km E of North Head, Sydney, New South Wales, 33º49.5'S, 151º21.8'E, dredged 26 April 1973, station SBS 1; AMS C.373099, 3 specimens from 71–77 m, 5.7 km E of Mistral Point, Sydney, New South Wales, 33º56.470'S, 151º19.630'E (wet); AMS C.388789, 11 specimens from 71–77 m, 5.7 km E of Mistral Point, Sydney, New South Wales, 33º56.470'S, 151º19.630'E, dredged, 20 July 1972, Station: SBS 2; AMS C.388794, 10 specimens from 115–176 m deep, East of Moreton Bay, Queensland, 26º55'S, 153º33'E, dredged 1969; AMS C.110614, 5 specimens from 101–128 m, East of Caloundra, Queensland, 26º45'– 26º50'S, 153º34'– 153º36'E; AMS C.101223, 6 specimens from 128–183 m, 12–15 miles NNE of Cape Moreton, Queensland, 27º00'S, 153º34'– 153º36'E; AMS C.388788, 3 specimens from 115–175 m, off Moreton Bay, Queensland, 27º10'S, 153º, 40'E; AMS C.372589, 3 specimens from 9 m, Twofold Bay, New South Wales, 37º5'S, 149º55'E; AMS C.468231, 1 specimen from 201 m, off S end of Fraser Island, Queensland, 27º57'S, 153º51.050'E; AMS C.388782 4 specimens from 73 m, off Tweed Heads, New South Wales, 28º17'S, 153º44'E; AMS C.468234 1 specimen from 71–77 m, 5.7 km E of Mistral Point, Sydney, New South Wales, 33º56.470'S, 151º19.630'E (wet); ANSP 310029, 4 specimens from 100 fathoms, off Cape Moreton, Queensland, Australia; SBMNH 424099, 1 specimen from shell dredge at 160 m, east of Mooloolaba, southern Queensland, Australia.</p> <p> <b>Type locality.</b> Cape Moreton, Queensland, Australia</p> <p> <b>Range.</b> Queensland and New South Wales, Australia.</p> <p> <b>Description.</b> Shell moderate in size, up to 42.4 mm long, solid, ovate-fusiform. We examined a total of 42 specimens that could be accurately measured. These averaged 27.8 mm long (range = 12.8–42.4 mm). They averaged 9.9 mm wide (range = 5.7–14.9 mm). Color pattern is banded with tan to yellow bands separated by areas of white. Three colored bands are present on the teleoconch whorls with one at the shoulder, one near midbody and the other at the anterior end. Sutural ramp has a colored band at the suture and a white area anterior to the colored band. Larger specimens have 6.7 to 7 whorls including the protoconch. Sculpture on the protoconch consists of fine spiral grooves. There are more than 4 spirals on the early to middle teleoconch sutural ramps. The spirals and axials are of the same size and do not produce a punctate appearance. The number of spirals is reduced on the outer teleoconch sutural ramps to two or three that are crossed by growth lines. The teleoconch is ornamented by closely set spirals separated by narrow interspaces. The sides of the body whorl are slightly convex but not flattened. The shoulders are indistinct. The aperture is narrow with a deep sinus, the lip is thin, straight and is produced medially. Inner shell walls are resorbed (Fig. 2K). The columella is nearly straight. There is a groove near its posterior end just where the columella meets the body whorl. This forms a denticle inside the aperture. The anal sinus is not symmetrical and is deepest at the suture. The protoconch is paucispiral, blunt and swollen looking. The operculum is leaf-shaped with a terminal nucleus. It is fairly large and covers most of the apertural opening. The operculum of a specimen (AMS C.373099) with a shell length of 17.3 mm measured 3.65 mm in length. Previous drawings of the radula suggested that it is simple with a barb and blade (see Powell 1966; Tucker & Tenorio 2009, as <i>B. biconica</i>). However, the tooth has more internal structure than previously known (Figs. 4E & F). The barb is blunt tipped and is about one-third as long as the blade. The distal end of the blade is elevated above the shaft of the tooth and slopes to meet the tooth shaft. There is no anterior fold but there is a C-fold. This fold demonstrates that the tooth is enrolled a minimum of 360 degrees. There are no serrations and no terminating cusp. There is a fold on the shaft of the tooth that begins posterior to the distal end of the blade. This fold extends to the waist of the tooth (Fig. 4E). The tooth has a slight but distinct waist.</p> <p> <b>Discussion.</b> This species has been confused with <i>Benthofascis biconica</i> (Figs. 1A–C), which it does resemble. The comparison to <i>B. biconica</i> is given under that species but in summary the two can be separated by body whorl shape and ornamentation of the first two whorls. In <i>B. biconica</i> the shoulders are more angular than in <i>B. pseudobiconica</i>. The early whorls of <i>B. biconica</i> have spirals and axials strongly developed, whereas in <i>B. pseudobiconica</i> the axials are hardly developed at all initially. <i>B</i>. <i>angularis</i> (Figs. 2A & C) has even more angular shoulders than does <i>B. pseudobiconica</i>.</p> <p> <b>Etymology.</b> The name underscores the similarities that the new species shares with <i>Benthofascis biconica</i>.</p>Published as part of <i>Tucker, J. K., Tenorio, M. J. & Stahlschmidt, P., 2011, The genus Benthofascis (Gastropoda: Conoidea): A revision with descriptions of new species, pp. 1-14 in Zootaxa 2796 (1)</i> on pages 7-9, DOI: 10.11646/zootaxa.2796.1.1, <a href="http://zenodo.org/record/5290155">http://zenodo.org/record/5290155</a>
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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