Phylogeny of the Cocculinoidea (Mollusca, Gastropoda)
نویسندگان
چکیده
منابع مشابه
Molecular phylogenetics of Caenogastropoda (Gastropoda: Mollusca).
Caenogastropoda is the dominant group of marine gastropods in terms of species numbers, diversity of habit and habitat and ecological importance. This paper reports the first comprehensive multi-gene phylogenetic study of the group. Data were collected from up to six genes comprising parts of 18S rRNA, 28S rRNA (five segments), 12S rRNA, cytochrome c oxidase subunit I, histone H3 and elongation...
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Gene conversion and positive selection are often proposed as mechanisms for the evolution of biological molecules. Changes in sequence similarity have been used as evidence for gene conversion (Crain et al., 1987). Evidence for the evolution of the actin gene family by gene conversion in the echinoderms, Strongylocentrotus purpuratus and Pisaster ochraceus, came from amino acid and DNA sequence...
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In marine invertebrates, polymorphism and polyphenism in mode of development are known as “poecilogony.” Understanding the environmental correlates of poecilogony and the developmental mechanisms that produce it could contribute to a better understanding of evolutionary transitions in mode of development. However, poecilogony is rare in marine invertebrates, with only ten recognized, well-docum...
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of development up to ready-to-hatch juveniles 2.5 mm in length. Based on their morphology and development in egg masses maintained in the laboratory, the embryonic period for B. hodgsoni is estimated to be up to 10 years, and for D. kerguelenensis 13 months. Thus, B. hodgsoni has the largest egg capsules and probably the largest hatchlings of any mollusc. Chemical analyses of D. kerguelenensis ...
متن کاملLoss of trematode parthenitae in Planorbella trivolvis (Mollusca: Gastropoda).
Infection by trematode parthenitae (larval, asexual trematodes) has severe consequences for molluscan hosts, resulting in cessation of reproduction and early mortality. Here we present evidence that the freshwater snail Planorbella trivolvis can lose infections by trematode parthenitae. Of 8 P. trivolvis infected by reniferin parthenitae, 6 died within 2 wk, whereas the remaining 2 snails lost ...
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ژورنال
عنوان ژورنال: Invertebrate Biology
سال: 2005
ISSN: 1077-8306
DOI: 10.1111/j.1744-7410.2003.tb00077.x