798 research outputs found
Attenborougharion gen. nov. (Mollusca: Pulmonata: Helicarionidae): a likely case of convergent evolution in southeastern Tasmania
No full textHyman, Isabel T., Köhler, Frank (2017): Attenborougharion gen. nov. (Mollusca: Pulmonata: Helicarionidae): A Likely Case of Convergent Evolution in Southeastern Tasmania. Records of the Australian Museum 69 (2): 65-72, DOI: 10.3853/j.2201-4349.69.2017.1676, URL: http://dx.doi.org/10.3853/j.2201-4349.69.2017.167
Brevisentis Hyman 2007
No full textBrevisentis Hyman, 2007 Brevisentis Hyman, 2007: 93. Type species Helix jacksoniensis Gray, 1834 (OD). Description. External morphology: Shell 4.4–4.8 whorls, glossy, spire and apex slightly raised. Protoconch sculptured with incised spiral grooves; teleoconch with microscopic spiral grooves. Whorl profile rounded above and below evenly convex periphery. Internal walls of early whorls complete; umbilicus open, very narrow U-shape. Mantle laps small to moderately long, not fused, uniform in colour. Mantle lobes small to very small, not fused. Caudal apparatus as for family; caudal foss vertical slit in tail. Mantle cavity: Mantle with visible minor blood vessels; pigmentation of black and white spots, orange spots in some specimens of B. jacksoniensis. Digestive system: Oesophageal crop absent. Genital system: Carrefour embedded in albumen gland; talon shallowly embedded (B. jacksoniensis) or free (B. atratus). Free oviduct short (B. atratus) or short to long (B. jacksoniensis); capsular gland present; internal longitudinal pilasters absent. Bursa copulatrix inserted on vagina, short to moderately short, less than or equal to half spermoviduct length; duct of bursa copulatrix wide, distinguishable from bursa copulatrix, internally with longitudinal pilasters. Vagina internally with longitudinal pilasters. Epiphallus enters penis laterally, through short to medium length verge; folded over top of penis and attached by connective tissue. Penis interior variable, consisting of pustules at apical end (sometimes partially fused) and longitudinal (B. jacksoniensis) or irregular (B. atratus) ridges at basal end; diverticulum on penis absent. Penial sheath enclosing only penis; penis retractor muscle attached to epiphallus. Epiphallus internally with longitudinal pilasters. Epiphallic retractor caecum absent. Flagellum present; flagellum and distal part of epiphallus with internal cryptae forming external projections. Spermatophore soft capsule with firm tail pipe, open at one end; tail pipe short and spiralling, sculptured with moderately short branching spines close to capsule, without sculpture at end of tail. Radula: Relatively long and narrow. Central tooth with small ectocones; mesocone lanceolate, longer than tooth base. Lateral and marginal tooth fields distinguishable. Lateral teeth with endocone smaller than central tooth ectocones; ectocone equal in size to those on central tooth; mesocone longer than tooth base. Marginal teeth with endocones absent; ectocones shorter and narrower than the mesocone, not subdivided into extra teeth. Remarks. This genus was created by Hyman (2007) for two species previously included in Melocystis, the latter genus being placed in synonymy with Nitor. A detailed account of the history of this group and its anatomy is given by Hyman (2007). Brevisentis differs from all other Australian helicarionid snails in having the short, wide and coiled flagellum, correspondingly spinose spermatophore, absent epiphallic caecum and extremely short vagina seen in the semislug genera Helicarion, Mysticarion, Parmavitrina and Peloparion. Brevisentis can also be readily differentiated externally from Nitor, the only confamilial snail genus with a range overlapping that of Brevisentis, by its rounded whorl profile and longer mantle laps.Published as part of Hyman, Isabel T. & Ponder, Winston F., 2010, A morphological phylogenetic analysis and generic revision of Australian Helicarionidae (Gastropoda: Pulmonata: Stylommatophora), and an assessment of the relationships of the family 2462, pp. 1-148 in Zootaxa 2462 (1) on page 44, DOI: 10.11646/zootaxa.2462.1.1, http://zenodo.org/record/531271
Phylogeny and systematic revision of the helicarionid semislugs of eastern Queensland (Stylommatophora, Helicarionidae)
No full textHyman, Isabel T., Köhler, Frank (2019): Phylogeny and systematic revision of the helicarionid semislugs of eastern Queensland (Stylommatophora, Helicarionidae). Contributions to Zoology 88 (4): 351-451, DOI: 10.1163/18759866-20191416, URL: http://dx.doi.org/10.1163/18759866-2019141
Stanisicarion Hyman & Ponder 2010
No full text<i>Stanisicarion Hyman & Ponder, 2010</i> <p> <i>Stanisicarion</i> Hyman & Ponder, 2010: 49.</p> <p> Type species <i>Helixarion freycineti</i> Férussac, 1821 (by original designation); masculine.</p> <p> <i>Macularion</i> Stanisic, 2010 in Stanisic et al., 2010: 312.</p> <p> Type species <i>Vitrina aquila</i> Cox, 1868 (by original designation); masculine.</p> <p>Remarks</p> <p> <i>Stanisicarion</i>, which is of masculine gender, was originally introduced for <i>Helixarion freycineti</i> Férussac, 1821 and <i>Vitrina virens</i> Pfeiffer, 1849, both previously included in <i>Fastosarion</i> (Hyman & Ponder, 2010). These two nominal species are distinguished from the rest of <i>Fastosarion</i> by their pustulose penis interior, the presence of a penial verge, the presence of only a short penial tunica, a less reduced shell, and less developed or fused shell lobes and lappets (Hyman & Ponder, 2010). In the same year, the genus <i>Macularion</i> was described for another former member of <i>Fastosarion</i>, <i>Vitrina aquila</i> Cox, 1868, based on the more prominent spiral sculpture on its shell and the strongly textured body surface of the animal.</p> <p> We show herein that <i>Stanisicarion</i> and <i>Macularion</i> are sister taxa, each containing just a single species. Together they represent Clade C in the mitochondrial phylogeny. They have less reduced shells with a higher whorl count than most moderate Qld semislugs, with strongly pustulose shell lappets (most easily visible in <i>S. freycineti</i> when the animal is at rest). The extent of the mantle lobes and shell lappets was difficult to compare, given the differing degrees of contraction present in preserved material; if there is a difference, it is very slight. The reproductive system had a vagina with deep internal pilasters (although pilasters were not always observed in the capsular gland) and where eggs could be observed, they always had deep spiralling grooves, in contrast to the smooth spherical eggs seen in <i>Fastosarion</i>. The epiphallic caecum was short and hooked with the penis retractor muscle attaching near its base, and the penis had primarily pustulose internal sculpture, a small, elongate verge partially fused to the penial wall, and a penial tunica that in most specimens covered around half of the penis. In addition, the two genera grouped closely in the phylogenetic tree.</p> <p>The genus as delineated herein is consistent with Clade C in the mtDNA phylogenies (figs. 1–3).</p> <p>Differential diagnosis</p> <p> <i>External appearance</i>: Shell medium-sized to large (14–20 mm), golden to greenish amber, glossy, ear-shaped, 3.5–4.4 whorls, subglobose with a low spire, last whorl large, whorls rounded. Protoconch and teleoconch with very fine spiral grooves.Mantle lobes and shell lappets moderately large, completely covering shell when extended, pustulose, spotted; slime network prominent; tail keeled towards tip; caudal horn moderately small.</p> <p> <i>Genitalia</i>: Spermoviduct of 3–5 lobes, embedded in digestive gland. Talon and carrefour embedded in albumen gland. Spermoviduct folded in zig-zag pattern. Free oviduct with oval, orange-brown capsular gland; interior of free oviduct with deep longitudinal pilasters, interior of capsular gland with folds in the thickened, glandular walls. Vagina moderately short, internally with longitudinal pilasters. Bursa copulatrix long, with slender duct and oval to elongate sac, inserted on the vagina. Penis long, slender, internally pustulose with no pilasters. Penis tunica covering only distal half of penis, attached by muscle fibres to middle of epiphallus; epiphallus enters penis through a short, conical verge, partially fused to penial wall, tip free; epiphallus 2 longer than epiphallus 1; epiphallic caecum situated in middle of epiphallus, short to moderately short, curved, penis retractor muscle attached at or near base; long, slender epiphallic flagellum with axial filament present, coiled and twisted irregularly. Spermatophore a soft-walled capsule with hard, smooth tail-pipe; tail-pipe mostly smooth, towards terminal end sculptured with a single spiraling toothed ridge.</p>Published as part of <i>Hyman, Isabel T. & Köhler, Frank, 2019, Phylogeny and systematic revision of the helicarionid semislugs of eastern Queensland (Stylommatophora, Helicarionidae), pp. 351-451 in Contributions to Zoology 88 (4)</i> on page 439, DOI: 10.1163/18759866-20191416, <a href="http://zenodo.org/record/8343061">http://zenodo.org/record/8343061</a>
Figure 3 in Homoplasy in shells discombobulated the taxonomy: revision of the larger helicarionid land snails of northern Queensland, Australia (Stylommatophora: Helicarionidae)
No full textFigure 3. Comparison of intra- and interspecific genetic p distances for mitochondrial gene COI.Published as part of Hyman, Isabel T. & Köhler, Frank, 2022, Homoplasy in shells discombobulated the taxonomy: revision of the larger helicarionid land snails of northern Queensland, Australia (Stylommatophora: Helicarionidae), pp. 1727-1799 in Journal of Natural History 56 (41-44) on page 1750, DOI: 10.1080/00222933.2022.2136017, http://zenodo.org/record/738068
FIGURE 5 Ancestral state reconstructions. A. Whorl count. B. Body length. C in Phylogeny and systematic revision of the helicarionid semislugs of eastern Queensland (Stylommatophora, Helicarionidae)
No full textFIGURE 5 Ancestral state reconstructions. A. Whorl count. B. Body length. C. Altitude.Published as part of Hyman, Isabel T. & Köhler, Frank, 2019, Phylogeny and systematic revision of the helicarionid semislugs of eastern Queensland (Stylommatophora, Helicarionidae), pp. 351-451 in Contributions to Zoology 88 (4) on page 391, DOI: 10.1163/18759866-20191416, http://zenodo.org/record/834306
FIGURE 33 in Phylogeny and systematic revision of the helicarionid semislugs of eastern Queensland (Stylommatophora, Helicarionidae)
No full textFIGURE 33 Distribution of Clade C species. ▲ = S. aquila, ● = S. freycineyti, ◻ = S. wolvi.Published as part of Hyman, Isabel T. & Köhler, Frank, 2019, Phylogeny and systematic revision of the helicarionid semislugs of eastern Queensland (Stylommatophora, Helicarionidae), pp. 351-451 in Contributions to Zoology 88 (4) on page 441, DOI: 10.1163/18759866-20191416, http://zenodo.org/record/834306
Homoplasy in shells discombobulated the taxonomy: revision of the larger helicarionid land snails of northern Queensland, Australia (Stylommatophora: Helicarionidae)
No full textHyman, Isabel T., Köhler, Frank (2022): Homoplasy in shells discombobulated the taxonomy: revision of the larger helicarionid land snails of northern Queensland, Australia (Stylommatophora: Helicarionidae). Journal of Natural History 56 (41-44): 1727-1799, DOI: 10.1080/00222933.2022.2136017, URL: http://dx.doi.org/10.1080/00222933.2022.213601
FIGURE 13 in Phylogeny and systematic revision of the helicarionid semislugs of eastern Queensland (Stylommatophora, Helicarionidae)
No full textFIGURE 13 Genitalia of F. comerfordae, MO63985, Broken River NP. A. Reproductive system. Arrow shows the junction of the penis and epiphallus. B. Penis interior. C. Spermatophore. Scale bars 1 mm (B, C), 2 mm (A).Published as part of Hyman, Isabel T. & Köhler, Frank, 2019, Phylogeny and systematic revision of the helicarionid semislugs of eastern Queensland (Stylommatophora, Helicarionidae), pp. 351-451 in Contributions to Zoology 88 (4) on page 409, DOI: 10.1163/18759866-20191416, http://zenodo.org/record/834306
FIGURE 15 in Phylogeny and systematic revision of the helicarionid semislugs of eastern Queensland (Stylommatophora, Helicarionidae)
No full textFIGURE 15 Genitalia of F. griseolus, MO55568, Bobby Range. A. Reproductive system. Arrow shows the junction of the penis and epiphallus. B. Penis interior. Scale bars 1 mm (B), 2 mm (A).Published as part of Hyman, Isabel T. & Köhler, Frank, 2019, Phylogeny and systematic revision of the helicarionid semislugs of eastern Queensland (Stylommatophora, Helicarionidae), pp. 351-451 in Contributions to Zoology 88 (4) on page 411, DOI: 10.1163/18759866-20191416, http://zenodo.org/record/834306
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