Journal
JOURNAL OF MOLLUSCAN STUDIES
Volume 80, Issue -, Pages 562-574Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mollus/eyu048
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Funding
- Direct For Biological Sciences
- Division Of Environmental Biology [1355190] Funding Source: National Science Foundation
- Division Of Ocean Sciences
- Directorate For Geosciences [1130072] Funding Source: National Science Foundation
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The history of the genus Costasiella is summarized. A new species of Costasiella, C. arenaria n. sp., from Lake Worth, Florida, USA is described. For comparative purposes specimens of C. formicaria (Baba, 1959) from Japan and serial sections of C. pallida Jensen, 1985 from Hong Kong have also been examined. These three species, like the type species C. virescens Pruvot-Fol, 1951 and C. coronata Swennen, 2007 from Thailand are not associated with the green alga Avrainvillea, which is the food of most known species of the genus. They share several morphological characters, i.e. pharynx without muscular pouches, radular teeth with narrow, smooth, blade-shaped cusps and short bases, unarmed penises and branches of albumen gland entering the cerata. A molecular phylogeny of 14 species of Costasiella based on four genes (mitochondrial COI and 16S rRNA and nuclear 28S rRNA and H3) supports morphological findings that the species not associated with the green alga Avrainvillea form a monophyletic group within the genus.
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