Title
Morphological and anatomical differentiation of three land snails of the genus **Rhynchotrochus** (Gastropoda: Pulmonata: Camaenidae) Morphological and anatomical differentiation of three land snails of the genus **Rhynchotrochus** (Gastropoda: Pulmonata: Camaenidae)
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
London ,
Subject
Biology
Source (journal)
The journal of molluscan studies. - London, 1976, currens
Volume/pages
75(2009) :1 , p. 1-8
ISSN
0260-1230
1464-3766
ISI
000262525800001
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Land snails of the Papua New Guinean camaenid genus Rhynchotrochus are described on the basis of shell shape, shell colour and banding pattern. We compared morphological and anatomical differentiation in three of the species, viz. R. albocarinatus, R. taylorianus and R. williamsi. The three species can be distinguished by their shell colour and banding pattern, as well as by their shell and reproductive morphology. Rhynchotrochus albocarinatus has a white, subglobose shell with up to five bands and a white to chocolate-brown outer lip. The penis is longer than the vas deferens and the length of the oviduct (LO) is approximately one-third that of the vagina. The subdepressed, trochiform shell of R. taylorianus is highly variable with respect to shell colour and banding pattern. The penis is approximately as long as the epiphallus and shorter than the vas deferens; the LO is approximately two-thirds that of the vagina. Rhynchotrochus williamsi has a white, unbanded, globose shell with a white to light pink outer lip and a dark protoconch. The penis is markedly shorter than the vas deferens or epiphallus which are approximately of the same length; the oviduct is approximately half as long as the vagina. Within R. taylorianus, there is substantial variation in shell colour, shell banding pattern and reproductive morphology that may confuse identification. We also document on one specimen of R. albocarinatus that has two interconnected penises. Since both penises were not connected to the spermoviduct, copulation as a male should have been prevented in this specimen.
E-info
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