Phosinella angusta (Laseron, 1956*)

Phosinella angusta (Laseron, 1956)

    Recovered from lumun-lumun nets deployed 40 meters deep off the north coast of Mactan Island, Cebu Province, central Philippines. Original images by George Hecht of the Florida Museum of Natural History, identifications by Harry Lee and Marien Faber and image editing by Bill Frank.

* Without close attention to authorship of this species, great confusion may result. To wit (chronologically):

Rissoina angusta Hedley, 1898 (p. 104, text figure <http://www.biodiversitylibrary.org/item/21753#page/116/mode/1up>) VALID species (reassigned due to misplacement at suprafamilial level): Pyramidelloides angusta (Hedley, 1898) [Eulimidae fide Warén, 1983; vide infra]

Rissoina angusta Preston, 1908 (p. 197 <http://www.biodiversitylibrary.org/item/109280#page/271/mode/1up>; pl. 14, fig.1 <http://www.biodiversitylibrary.org/item/109280#page/287/mode/1up>); type figure also at <http://www.marinespecies.org/aphia.php?p=image&pic=98336>). Potentially UNAVAILABLE: PRIMARY JUNIOR HOMONYM of R. angusta Hedley, 1898. This biotaxon is not closely related to any of the other two treated here [Rissoinidae].

Phintorene angusta Laseron, 1956 (p. 407, fig. 50): type figure at <http://www.marinespecies.org/aphia.php?p=image&pic=98808> VALID species (reassigned due to subjective synonymy, generic level): Phosinella angusta (Laseron, 1956) [Rissoinidae].

Hedley, C., 1898. Descriptions of new Mollusca, chiefly from New Caledonia. Proceedings of the Linnean Society of New South Wales.23: 97-105.

Laseron C.F., 1956. The families Rissoinidae and Rissoidae (Mollusca) from the Solanderian and Dampierian zoogeographical provinces. Australian Journal of Marine and Freshwater Research 7(3): 384-484. October.

Preston, H.B., 1908. Descriptions of new species of land, marine and freshwater shells from the Andaman Islands. Records of the Indian Museum 2(2):187-210, pls. 14-17.

Warén, 1983. An anatomical description of Eulima bilineata Alder with remarks on and a revision of Pyramidelloides Nevill (Mollusca, Prosobranchia, Eulimidae). Zoologica Scripta 12(4): 273-294.

Abstract: “The anatomy and biology of Eulima bilineata Alder is described and compared with Pyramidelloides miranda (A. Adams) and P. angusta (Hedley). All the species are parasitic on ophiuroids, have a ptenoglossate radula, an acrembolic proboscis with a pair of salivary glands close to the buccal mass and a reduced stomach with two histologically different digestive glands. The males have a well developed penis, the female a partly open or closed pallial oviduct. The central nervous system is concentrated. The sub- and supraoesophageal ganglia are completely integrated in the nerve ring. In Eulima, the supraoesophageal ganglion is split into two parts. Few differences were found between the species investigated, and it is concluded that Pyramidelloides should be classified in Eulimidae, not in Rissoidae where it has been placed previously.”

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