Morphology of two deep-sea Olivella from the southwestern Atlantic, with a record of a radula-less Olivellinae species (Neogastropoda: Olivoidea: Olividae)
Pimenta, A.D.; Simone, L. R. L. (2021). Morphology of two deep-sea Olivella from the southwestern Atlantic, with a record of a radula-less Olivellinae species (Neogastropoda: Olivoidea: Olividae). Archiv. Molluskenkd. (2004) 150(1): 31-43. https://dx.doi.org/10.1127/arch.moll/150/031-043
In: Archiv für Molluskenkunde (2004). Schweizerbart: Stuttgart. ISSN 1869-0963, more
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| Keywords |
Gastropoda [WoRMS]; Mollusca [WoRMS]; Olivella Swainson, 1831 [WoRMS]; Olivella Swainson, 1831 [WoRMS]
Marine/Coastal |
| Author keywords |
Mollusca; Gastropoda; Anatomy; Anasser; Olivina; radula morphology |
| Authors | | Top |
- Pimenta, A.D.
- Simone, L. R. L.
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| Abstract |
Two deep-sea species from southeast Brazil, originally assigned to different subgenera of Olivella, are anatomically described. Olivella (Olivina) klappenbachi and Olivella (Anasser) careorugula, both described by Absalão & Pimenta (2003), present typical Olivellinae anatomy, with internal absorption of the shell wall and a non-spiralized visceral mass, the absence of a valve of Leiblein and gland of Leiblein, and a large cuticularized and muscular stomach. Olivella klappenbachi presents the typical radular morphology of Olivellinae, while Olivella careorugula lacks a radula and odontophore, which is unique among known olivids. A well-founded phylogenetic classification of Olivella at the generic/subgeneric level is still lacking, and the numerous proposed subgenera are mostly based on the structure of the pillar. A broader taxonomic study incorporating both morphological and molecular data is still necessary. |
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