Tag Archives: annulariidae

New Hispaniolan Annulariids

Already some months ago, Thomas Watters published a new revision dealing with Hispaniolan annulariids (Watters & Larson, 2017).

The annulariid genera Chondropomella, Chondropomium, and Clydonopoma are believed to have originated from the Tiburon/Barahona Peninsula in isolation from the rest of Hispaniola. Chondropomium has colonized the rift valley and adjacent river valleys between the Tiburon Peninsula and the remainder of Hispaniola. It is primarily limited to xeric lowlands, rarely found above 200 m elevation. Little is known about the rare Chondropomella but they seem to occur in the rift valley in xeric areas as well. In contrast, Clydonopoma is endemic to the Sierra Baoruco with a single species in the adjacent eastern Massif de la Selle and occupies the upland mesic forests and pine savannahs between 200–4000 m. The most widely distributed species, Chondropomium weinlandi, has been the subject of considerable confusion concerning the nature of its many color forms or subspecies, as well as its valid name. This species was investigated using phylogenetic methods and compared to congeners and related genera. A phylogenetic study aimed at elucidating relationships among these taxa analyzed a partitioned matrix of nuclear (ITS 1) and mitochondrial (CO1, 12S, 16S) DNA sequences in a Maximum-likelihood framework under the GTR+G substitution model. Contrary to Bartsch’s 1946 assessment that C. weinlandi is a complex of subspecies, it is here shown to be a single, highly polymorphic species for color. The new genus Superbipoma is recognized based on phylogenetic, radular, and conchological evidence. It contains two species: S. asymmetricum (Henderson and Simpson, 1902) and S. superbum (Pilsbry, 1933). Eleven species of Chondropomium are recognized including two new species: C. caelicum and C. sardonyx; three species of Chondropomella and nine species of Clydonopoma, including one new species, Clydonopoma titanum, are recognized. A calcified operculum is the ancestral condition for the Annulariidae. In Clydonopoma and Chondropomella the operculum is a particularly complex calcified structure termed the pseudolamella. This structure has been lost in Chondropomium and Superbipoma”.

As usual, this paper is very thorough, well organised and includes a phylogenetic study based on a multi-locus analysis.

Reference:
Watters, G.T. & Larson, P., 2017. A revision of the Hispaniolan genera Chondropomella, Chondropomium, and Clydonopoma (Gastropoda: Annulariidae), with the recognition of a new genus, Superbipoma: phylogenetic, radular, and conchological evidence. – Nautilus, 131 (3):163-201.

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Hispaniolan Weinlandipoma

Freshly pressed: a review by Thomas Watters of twenty Weinlandipoma species from Hispaniola, with description of seven new taxa: W. charybdis, W. corbis, W. formonense, W. gregoi, W. pruinosum, W. silmarilium, and W. tylotum. Species are distributed on either the Massif de la Hotte or the Massif de la Selle on the Tiburon Peninsula of the island. Most are locally endemic, often confined to a single mountain peak or slope or island. All are currently susceptible to extinction.

This is another sound contribution of Watters to the malacofauna of the Caribbean area.

Reference:
Watters, G.T., 2017. A review of Weinlandipoma (Gastropoda, Littorinoidea, Annulariidae) from the Tiburon Peninsula of Hispaniola: imperiled local endemics. – Basteria, 81 (4-6): 65-89.

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 Hispaniola

Today two papers by Thomas Watters describing new species from the island of Hispaniola. Watters’ (2016a) abstract is “Chondropoma bellavittatum new species is described for the Haitian species referred to by Bartsch, 1946, as Chondropoma semilabre Lamarck, 1822. This latter species is shown to be a different taxon from the Bahamas”.

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The second paper, which appeared in the same journal, deals with a new species from the eastern part of the island. “Parachondria joyeuse is described from the eastern Dominican Republic. The new species is characterized by a thin, high- spired, nearly smooth shell and a peculiar color pattern. It is placed in Parachondria with reservation”.

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References:
Watters, G.T., 2016a. Identification and redescription of the Haitian Chondropoma semilabre of Bartsch, 1946, non Lamarck, 1822 (Gastropoda: Annulariidae). – The Nautilus, 130 (1): 23–25.
Watters, G.J., 2016b. Parachondria joyeuse: a peculiar new species of Hispaniolan Annulariidae (Gastropoda: Littorinoidea). – The Nautilus, 130 (4): 164–165.

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.

A new Tudora from Venezuela

In the most recent number of Basteria Hovestadt published a short paper on the Peninsula de Paraguaná in Venezuela, describing a new Annulariid species: Tudora paraguanensis. The new species is the first record of Tudora from the South American mainland, and although the collected specimens are regarded as ‘subfossil’, it cannot be excluded that the finding of living specimens is possible.

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Reference:
Hovestadt, A. A new Tudora (Gastropoda, Hypsogastropoda, Annulariidae) from Peninsula de Paraguaná, Venezuela. – Basteria, 80:149-151.