Tag Archives: types

New Radiodiscus

Freshly pressed: a paper by Mike Rutherford describing a new species from Trinidad. “Radiodiscus hollidayi, a new species of Charopidae, is described from the island of Trinidad, Trinidad and Tobago. The description is based on conchological features alone: a tiny discoid shell with a distinct protoconch with 6–8 cordlets, fine ribs on the teleoconch, and a deep umbilicus. The snail is found in leaf litter and humus in a variety of forest habitats across Trinidad. A table compares a common set of measurements and characters across 27 other species of Radiodiscus“.

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A nice addition to the fauna of Trinidad, which still deserves an updated checklist on which the author is working.

Reference:
Rutherford, M.G., 2020. A new species of Radiodiscus (Gastropoda: Eupulmonata: Charopidae) from Trinidad and Tobago. – Archiv für Molluskenkunde 149(1): 67-74.

Revision of Cepolis

Recently Tom Watters published one of his revisionary papers on West Indian molluscs. “The genus Cepolis Montfort, 1810 (Cepolidae) is endemic to the Tiburon and Barahona peninsulas of Hispaniola (Greater Antilles). Eight species are recognized in Cepolidae including two new species. The taxonomy of the group is hindered by references to inadequate figures, vague or missing type localities, and other nomenclatural problems. Cepolis Montfort, 1810 is here divided into three distinct genera: Cepolis, Cepolella n. gen. and Laevicepolis n. gen.
New genera: Cepolella n. gen., type species Cepolis definita Fulton, 1908; Laevicepolis n. gen., type species Helix porcellana Grateloup, 1840. New species: Cepolis isomeroides n. sp. from the Massif de la Selle of Haiti; Cepolis infissa n. sp. from the western highlands of the Sierra de Baoruco. New combinations: Cepolis definita (Fulton, 1908), Cepolis trizonaloides (Brown, 1862) and Cepolis trizonalis (Grateloup, 1840) are transferred to Cepolella n. gen.; Cepolis porcellana (Grateloup, 1840) is transferred to Laevicepolis n. gen.“.

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It is most regrettable that Tom Watters died before he could see this paper in print. It has his usual thoroughness and keen eye for details that makes his contributions so valuable for the knowledge of Neotropical biodiversity.

Reference:
Watters, G.T., 2020. Review of the Hispaniolan land snail genus Cepolis Montfort, 1810 (Gastropoda: Helicoidea: Cepolidae). Novapex 21(1): 1-15.

New Brazilian Rectobelus

A paper published last year describing a new species from Brazil is Simone & D’ávila. “Rectobelus levogyrus, a new species of subulinid, is described found in archaeological surveys in Amazon shell mounts (sambaquis) from Costa Marques, Rondônia, Brazil. It is the first sinistral subulinid species recorded in Brazil, and that is its main distinguishing character. A brief taxonomical treatment of the other congener species, R. rectus (Baker, 1927) (the type species, from Venezuela) and R. birabeni (Hylton Scott, 1946) (from Argentina) is included, with figures, as well as a discussion on the validity of the genus“.

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The title of this papers is curious, citing two different subfamily names, which are both outdated as the Subulininae are now considered as belonging to the Achatinidae. This is a very difficult group as the species are separated on minor details which are often not consistently studied in larger series. Many species from the ‘subulinid’ group are supposed to have continuous growth, making size differences difficult to use as a taxonomic characteristic. Moreover, for many species anatomical and molecular data are lacking. In this paper Simone disagrees with the opinion of Hausdorf, who considered Rectobelus H.B. Baker. 1927 as a synonym of Ischnocion Pilsbry, 1907. The latter is placed on MolluscaBase in the subfamily Coeliaxinae. Thus there remains ample room for further research.

Reference:
Simone, L.R.L. & D’ávila, 2019. The discovery of a sinistral Obeliscinae (Eupulmonata, Subulinidae) in Brazil, found in Amazon archaeological shell mounds of Rondônia. – Journal of Conchology 43(4): 327-336.

New streptaxid from Brazil

Salvador & Cunha just published a new paper, describing a new Brazilian species. “A new species of Streptartemon Kobelt, 1905 land snail from Santos, SE Brazil, is herein described as Streptartemon waukeen sp. nov., from specimens originally found in an urban garden. The new species is distributed along coastal urban areas from southern Espírito Santo state to São Paulo state. It can be diagnosed from its congeners by the following features: a comparatively small shell; the penultimate and body whorls bulging and rounded; a small and roughly circular aperture; and the lack of apertural lamellae/teeth. The new species also presents a bursa tract diverticulum, which is a plesiomorphic state in stylommatophoran snails, but absent in most streptaxid genera. Further details of the genital anatomy, as well as DNA barcoding information, are provided“.

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The discovery of this new taxon in urban areas is remarkable. Further collecting should show if this species is confined to anthropological habitats or not.

Reference:
Salvador, R.B. & Cunha, C.M., 2020. A new species of Streptartemon from southeastern Brazil (Gastropoda: Streptaxidae). – Journal of Conchology 43(5): 513-520.

New Pantepui Plekocheilus

Freshly pressed: a paper with additional data on snails from the Eastern Pantepui region, with description of 3 new species. “Recent visits by a herpetologist to hitherto unexplored or ill–explored tepuis in the Pantepui area of Venezuela reveal three new species: Plekocheilus (P.) sanderi, P. (Eurytus) annetae, and P. (E.) timoi. This brings the total number of recognised species in the Pantepui to 27 land snails, of which 23 belong to the dominating superfamily Orthalicoidea“.

sanderi-annetae-timoi

 

Reference:
Breure, A.S.H., 2020. Additional data on Eastern Pantepui Orthalicoidea land snails (Mollusca, Gastropoda). – Journal of Conchology 43(5): 481-496.

New Argentinian Succinea

Recently Miquel et al. investigated the Succineidae from the southern tip of South America and found a new species.

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A new species of Succinea from Santa Cruz Province (Argentina) is described. Succinea argentina sp. nov. is characterized by the following features: a shell of regular growth, 3 to 3.25 whorls, length of 6.0 to 7.15 mm, shell not succineid, opaque walls and conspicuous axial ribs; straw­yellow opaque deciduous peri­ostracum; radular formula: 21-9-C-9-21, with central tooth tricuspid, lateral teeth bicuspid and marginal teeth tricuspid; penis with epiphallus, wrapped in a com­mon sheath, without appendices, and formed by two regions: a long proximal re­gion, which is lined by a mucosa with multiple transverse folds, and a short distal region, which opens into the atrium; vas deferens composed of three main regions – pre­prostatic, prostatic and post­prostatic –, entering the epiphallus subtermi­nally, and covered by a mucosa with multiple folds of different sizes; vagina long, thin and convolute; spermatheca globose, with a long duct that opens in the last portion of the vagina; atrium short“.

As with all succineid species the anatomy plays an important role. Nonetheless it is remarkable that the authors diagnose this species morphology as “not succineid”. There are several other related species occurring in this region from which it is, however, clearly different.

Reference:
Miquel, S.E. et al., 2019. A new species of Succinea Draparnaud from the extreme south of Argentina. – Spixiana, 42: 177-184.

Type material of Cousin

Just published*: a paper on the type material present in the Brussels museum from Cousin, containing both species described by him and by Jousseaume.

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Type material is documented for 28 taxa described by Cousin and Jousseaume on the basis of material collected by Cousin in Ecuador. These taxa belong to 12 families (Achatinidae, Ampullariidae, Bulimulidae, Labyrinthidae, Lymnaeidae, Neocyclotidae, Orthalicidae, Planorbidae, Proserpinellidae, Scolodontidae, Solaropsidae, Succineidae). Type specimens and their labels are figured. In some instances, the specimen labels provide more precise locality information than the literature reference. Isomeria bourcieri var. lutea Cousin, 1887 is now considered a junior objective synonym of Isomeria bourcieri (L. Pfeiffer, 1853)“.

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The paper is an advance-online publication, the correct pagination numbers will follow when it is published in the printed issue later this year. It is a forerunner for a paper on Ecuadorian non-marine molluscs where, together with co-authors, we are still working on.
*There may be some confusion about the publication date. ResearchGate picked up the title of this paper already a while ago when I still had to make my final corrections to the proofs. Both the editor and myself were wondering how that was possible, as I already received requests for the full-text via ResearchGate.

Reference:
Breure, A.S.H., 2020. Type material of taxa described by Cousin and Jousseaume in the Royal Belgian Institute of Natural Sciences, Brussels. – Folia Malacologica 28: 0-0 (advance online). https://doi.org/10.12657/folmal.028.005

New fossil Cerion

Harasewych is well-known for his studies on Cerionidae. He described last year a new fossil from Aruba.

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Cerion uva gouldi is described as a new subspecies to include only fossil and subfossil Cerion uva from Aruba. The name Cerion uva arubanum Baker, 1924 had previously been applied to all Cerion uva from Aruba, living and fossil. A recent molecular study has shown that Cerion uva arubanum, a taxon based on living type material from Aruba, is a synonym of Cerion uva uva (Linnaeus, 1758), with which it shares a preponderance of mitochondrial haplotypes. Cerion uva was widespread on Aruba during the Pleistocene, but became extinct on that island and was subsequently re-introduced from a population near Willemstad in eastern Curacao by humans within the past 800 years. Earlier authors had recognized that fossil Cerion from Aruba differ in morphology from those living on the island today, with fossils being more similar to specimens from western Curacao and Bonaire, while those living on Aruba today are most similar to Cerion uva uva from eastern Curacao. Cerion uva gouldi may be distinguished from living populations of Cerion on Aruba on the basis of its cylindrical rather than ovate shell shape, its more closely spaced whorls, and its round aperture with a uniform rather than anteriorly expanded parietal rim“.

Reference:
Harasewych, M.G., 2019. Cerion uva gouldi, a new fossil subspecies from Aruba (Gastropoda, Pulmonata, Cerionidae). – Proceedings of the Biological Society of Washington, 132(1): 35-39.

New Chilean Bostryx

Just published by Walther & Gryl, a new paper : “Bostryx koehleri n. sp. is described from a dry riverbed in the Atacama Desert north of Paposo, Chile. The new species has been found in an extremely arid region that gets some humidity only through mist from the nearby sea“.

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As the species was found on the alluvial fan of a river, the authors state “it cannot be excluded that we are dealing with a fossil or subfossil species whose shells are washed out and deposited on the alluvial fan as the result of occasional flooding events“. Their suggestion is that the actual habitat of this species is higher up in the mountains.

Reference:
Walther, F. & Gryl, I., 2019. A new species of Bostryx (Gastropoda: Bulimulidae) from the Atacama Desert (Chile). – Archiv für Molluskenkunde, 143 (2): 111-115.

Colombian Stenostylus and Drymaeus

Freshly pressed: a paper on two genera from Colombia with description of new species. The following abstract is given: “The land snails of the genera Drymaeus Albers, 1850 and Stenostylus Pilsbry, 1898, both belonging to the family Bulimulidae, and occurring within northwestern South America are revised and notes on their distribution are given. 78 species of Drymaeus and two of Stenostylus are herein confirmed from Colombia, and are illustrated for comparison. Six new (sub)species are described: Drymaeus (Drymaeus) denticulus, D. (D.) duplexannulus, D. (D.) felix restrepoensis, D. (D.) iniurius, D. (D.) intermissus, D. (D.) luciensis.”

5DrymaeusCOL

The abstract continues: “Drymaeus flexuosus megas Pilsbry, 1944 is now upgraded to species level. A lectotype is designated for Drymaeus roseatus montanus Pilsbry, 1901.
The following nominal taxa are herein synonymised: Bulimus antioquiensis L. Pfeiffer, 1855 = B. baranguillanus L. Pfeiffer, 1853; Bulimus hachensis Reeve, 1850 = B. virgo Lea, 1838 = B. columbianus Lea, 1838; Drymaeus eversus alata Piaget, 1914 = Drymaeus eversus subula Piaget, 1914 = Bulimus violaceus Mousson, 1873 = B. confluens L. Pfeiffer, 1855; Drymaeus cantatus medinanus Pilsbry, 1935 = D. tusagasuganus Pilsbry, 1935 = Bulimulus (Drymaeus) plicatoliratus da Costa, 1898 = Bulimus convexus L. Pfeiffer, 1855; Drymaeus fallax chicoensis Breure, 1977 = Bulimus fallax L. Pfeiffer, 1853; Bulimus trivittatus Mousson, 1869 = B. felix L. Pfeiffer, 1862; Bulimus andicola L. Pfeiffer, 1847 = B. multilineatus Say, 1825; Bulimulus (Drymaeus) comis Preston, 1907 = Bulimus pealianus Lea, 1838; Drymaeus incognita da Costa, 1907 = D. bellus da Costa, 1906 = D. blandi Pilsbry, 1898 = Bulimulus (Drymaeus) smithii da Costa, 1898.
For the following species, precise localities are given for the first time: Drymaeus (Drymaeus) angusta da Costa, 1906, D. (D.) auris (L. Pfeiffer, 1866), D. (D.) baranguillanus (L. Pfeiffer 1853), D. (D.) cognatus Pilsbry, 1901, D. (D.) geometricus (L. Pfeiffer 1846), D. (D.) inclinatus (L. Pfeiffer 1862), D. (D.) spadiceus da Costa, 1906, D. (Mesembrinus) koppelli (G.B. Sowerby III, 1892), D. (M.) muliebris (Reeve 1849).
Newly recorded for the Colombian malacofauna are the following five taxa: Drymaeus (Drymaeus) fordii Pilsbry, 1898, D. (D.) glaucostomus (Albers, 1852), D. (D.) volsus Fulton, 1907, D. (Mesembrinus) interruptus (Preston, 1909).
The following 27 taxa are excluded from the Colombian fauna as we consider them based on erroneous or doubtful records: Stenostylus meleagris (L. Pfeiffer, 1853), Drymaeus (Drymaeus) attenuatus (L. Pfeiffer, 1853), D. (D.) chimborasensis (Reeve, 1848), D. (D.) edmuelleri (Albers, 1854), D. (D.) linostoma (d’Orbigny, 1835), D. (D.) membielinus (Crosse, 1867), D. (D.) phryne (L. Pfeiffer, 1863), D. (D.) poecilus (d’Orbigny, 1835), D. (D.) protractus (L. Pfeiffer, 1855), D. (D.) rugistriatus Haas, 1952, D. (D.) strigatus (Sowerby, 1833), D. (D.) subinterruptus (L. Pfeiffer, 1853), D. (Mesembrinus) cactivorus (Broderip, 1832), D. (M.) deshayesi (L. Pfeiffer, 1845), D. (M.) dubius (L. Pfeiffer, 1853), D. (M.) flavidus (Menke, 1829), D. (M.) granadensis (L. Pfeiffer, 1848), D. (M.) liliaceus (Férussac, 1821), D. (M.) loxanus (Higgins, 1872), D. (M.) manupictus (Reeve, 1848), D. (M.) multifasciatus (Lamarck, 1822), D. (M.) nitidus (Broderip, 1832), D. (M.) pertristis Pilsbry, 1898, D. (M.) pervariabilis (L. Pfeiffer, 1853), D. (M.) studeri (L. Pfeiffer, 1847), D. (M.) translucens (Broderip, 1832)“.

The paper includes distribution maps for most species and a brief analysis of the fact that a number of species have not been recorded again after their initial collection.

Reference:
Breure, A.S.H. & Borrero, F.J., 2019. A review of Stenostylus Pilsbry, 1898 and Drymaeus Albers, 1850 (Mollusca: Gastropoda: Orthalicoidea: Bulimulidae) from Colombia, with description of new species. – Folia conchyliologica, 52: 1-79