Tag Archives: West Indies

Phylogenetic data on Sagdoidea

As an advance online publication, recently appeared the paper by Sei et al. on the phylogenetic relationships within the Sagdoidea.

The abstract reads: “We performed multi-locus, time-calibrated phylogenetic analyses of Jamaican Pleurodontidae to infer their relationships within pulmonate land snails. These analyses revealed that Sagdoidea, with about 200 species in the Caribbean Basin and neighbouring regions, is the sister group of Helicoidea with about 4700 species worldwide and that these superfamilies diverged 61–96 Ma. Morphological disparity in Sagdoidea is similar to that in Helicoidea despite its much lower species richness. Helicoidea originated in the New World and colonized the Old World 46–64 Ma. Pleurodontids and sagdids colonized Jamaica 15.0–18.4 and 12.8–16.5 Ma, respectively, consistent with geological estimates of Jamaican subaerial emergence by mid-Miocene. Allopatric convergence in shell morphologies required caution in using fossils from outside the geographic range of ingroup taxa to calibrate molecular clock estimates. Estimates of ages of clades varied by 24–55%, depending on the calibration points included. We use these results to revise Helicoidea and Sagdoidea. Pleurodontids from Jamaica and the Lesser Antilles were reciprocally monophyletic but other putative pleurodontids grouped basally in Helicoidea as Labyrinthidae (new family), or with Sagdidae. Newly recognized members of Sagdoidea are Solaropsinae and Caracolinae (Solaropsidae), Polydontinae (Sagdidae) and Zachrysiidae (new family). Pleurodontidae is restricted to two subfamilies, Pleurodontinae, in the Lesser Antilles, with Gonostomopsinae, a synonym, and Lucerninae resurrected for the Jamaican endemic genera Lucerna, Dentellaria, Thelidomus and Eurycratera. Lucerna and Dentellaria have been treated as subgenera of Pleurodonte, but rendered it paraphyletic in our analyses”.

This is a nice piece of research for which the authors did extensive DNA research with 3 loci and divergence time analysis. This resulted in a major taxonomical revision of the group, defining the Pleurodontidae and erecting the Labyrinthidae and Zachrysiidae.

Reference:
Sei, M., Robinson, R.G., Geneva, A.J. & Rosenberg, G., 2017. Doubled helix: Sagdoidea is the overlooked sister group of Helicoidea (Mollusca: Gastropoda: Pulmonata). – Biological Journal of the Linnean Society, XX: 1-32 [advance online publication, hence the correct reference will be different].

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A brief Barbados visit

Today I saw the paper published by Franke already in 2015. Because of its interests for this blog, it is summarised here.

During a short visit to Barbados, the author found specimens of Pseudopineria barbadensis Kraus, 1996 and describes its habitat. From the same site a second species is reported, Truncatella barbadensis Pfeiffer, 1856.

Reference:
Franke, S., 2015. Fundortbestätigung: Pseudopineria barbadensis Kraus 1996 (Pulmonata: Urocoptidae) auf der Insel Barbados. – Mittheilungen Club Conchylia, 25: 19-22.

An overlooked designation

Taxonomy of fossils and recent species sometimes intertwines as demonstrated by a new publication of Kadolsky.

A nice update for the correct names of the Hispaniolan malacofauna.

Reference:
Kadolsky, D., 2017. On the type species of the genus Galactochilus Sandberger, 1875, with a review of the identity of Helix cornumilitare Linnaeus, 1758 and of its misidentifications (Gastropoda: Helicoidea). – Archiv für Molluskenkunde, 146: 97-110.

Photo of the day (173): Drymaeus

The group ‘Speurneuzen’ makes nearly every week a hike on the Island of Curaçao, usually to look for cultural-historical objects, but always to enjoy nature. This week they followed a new trail made by ‘Uniek Curaçao’ from Fort Kloof to Ascuncion. From their photo report I show a small batch of Drymaeus elongatus on a Wayaca tree.

The picture was made by Fred Chumaceiro.

Review of part of Hispaniolan Annulariidae

The third post on Watters’ 2016 papers concerns his review of the Paracondria (Chondropomorus) complex. “Nineteen species are recognized including eight new species: Parachondria anatolensis n. sp., Parachondria arcisensis n. sp., Parachondria daedalus n. sp., Para- chondria heatheraikenae n. sp., Parachondria isabellinus n. sp., Parachondria muchai n. sp., Parachondria silvaticus n. sp., and Parachondria stigmosus n. sp. Distributional and habitat notes are given for additional taxa. Chondropoma marinum “Weinland” Reeve, 1863, is regarded as a nomen dubium. Chondropoma (Chondropomorus) moroni Bartsch, 1946, is reidentified as Crossepoma emilianum (Weinland, 1862). Chondropoma simplex Pfeiffer, 1852, regarded by Bartsch (1946) as a Chondropomorus, is considered a Chondropoma”.

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Reference:
Watters, G.J., 2016. Review of the Hispaniolan Parachondria (Chondropomorus) complex (Gastropoda: Littorinoidea: Annulariidae). – Zootaxa, 4127 (2): 245–275.

New Annulariidae from Dominican Republic

Thomas Watters has published last year a series of papers on Antillean Annulariidae which have not been mentioned here. Today I start with a paper on the Dominican Republic; the abstract reads “A new genus and species of Annulariidae are described from the Dominican Republic: Tessaripoma n. gen. and Tessaripoma arenarium n. sp. The genus also contains T. hooksi (Watters & Duffy, 2010) and T. alyshae (Watters & Duffy, 2010). The genus is endemic to the eastern end of the Hoya de Enriquillo between the Tiburon/Barahona Peninsula and the remainder of Hispaniola”.

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Reference:
Waters, G.T., 2016. A new genus and species of Annulariidae (Gastropoda) from the Dominican Republic: Tessaripoma n. gen. and Tessaripoma arenarium n. sp. –  Novapex, 17 (2-3): 51–54.