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Index and abstracts of Vita Malacologica, Nr. 5, October 2007
Abstracts
Description of a new Vexillum species (Gastropoda: Costellariidae) from Indonesia.
Vexillum maduranum spec. nov. is described from the island Java, Indonesia. The species is compared with V. (V.) jukesii (A. Adams, 1853), V. (V.) formosense (Sowerby III, 1889), V. (V.) curviliratum (Sowerby II & III, 1874) and a third not yet described species, erroneously called V. (V.) weberi (Bartsch, 1918). The new species is probably an Indonesian endemic.
Costellariidae (Gastropoda) of the Maldive Islands, with descriptions of nine new species.
Notes on the natural history of the Maldive Islands are followed by a historical outline of the occurrence of Mollusca in the archipelago, in particular the species of Costellariidae.
The following nine species are described as new: Vexillum (Costellaria) cookorum spec. nov., V. (C.) fraudator spec. nov., V. (Pusia) silviae spec. nov., V. (P.) kuboi spec. nov., V. (P.) torotortum spec. nov., V. (P.) thila spec. nov., Thala maldivensis spec. nov., T. aubryi spec. nov., and T. manolae spec. nov. Lectotypes are designated for two Thala species, described as Mitra recurva Reeve, 1845 and M. mirifica Reeve, 1845.
Data on the morphology, systematics, nomenclature (with the main synonyms) and distribution of the 69 species of Costellariidae that have been recorded for the Maldives are presented, with many illustrations, and references to collections where Maldivian specimens are stored. The biogeographic and ecological aspects of the Maldivian Costellariidae are summarized and all species of ostellariidae that are actually known from Eastern Arabia, the Seychelles, the Maldives, and India are listed.
New species of Thala (Gastropoda: Costellariidae) from the Hawaiian Islands, with comments on other Indo-Pacific species.
We show that the three species of Thala known from the Hawaiian Islands are endemic, rather than having broader Indo-Pacific distributions as previously thought. Records of Thala todilla (Mighels, 1845) outside of the Hawaiian Islands are misidentifications, as are records of Thala milium (Reeve, 1845) and Thala exilis (Reeve, 1845) within the Hawaiian Islands. The latter are described as endemic species, Thala lillicoi sp. nov. and Thala hilli sp. nov., respectively. Neotypes are designated for Thala todilla and T. milium, with the later becoming an objective senior synonym of, and the valid name for, Thala illecebra (Melvill, 1927), which is endemic to Japan. Thala angiostoma Pease, 1868, from the Tuamotu Archipelago, is confirmed as a valid species rather than a synonym of T. mirifica (Reeve, 1845). With these revisions, the Recent diversity of Thala increases to 23 species; only 3 species were recognized in 1970. This eight-fold increase in known diversity is concordant with other recent studies showing that levels of diversity and endemism in the Indo-West Pacific have been substantially underestimated.
A new species of Vexillum (Gastropoda, Costellariidae) from the Philippines.
Vexillum albofulvum spec. nov. is described from the Philippines and is compared with V. plicarium (Linnaeus, 1758) and V. pedroi Poppe & Tagaro, 2006 from the same area and the same depth of water between 8 and 25 m.
Mitra (Mitra) marmorea, a new species from Madagascar (Gastropoda: Mitridae)
Mitra (Mitra) marmorea n. sp. from shallow subtidal water of Madagascar resembles several Indo-Pacific Mitridae species. It is at first distinguished from several forms of the variable M. (M.) bovei Kiener, 1838. The new species is also compared to M. (M.) pseudobovei T. & V. Cossignani, 2005, M. (M.) manuellae T. & V. Cossignani, 2006, and M. (Strigatella) abacophora Melvill, 1888.
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