Vetigastropod phylogeny and a new concept of Seguenzioidea: independent evolution of copulatory organs in the deep‐sea habitats

2007/12/07 by Yasunori Kano · 21 citations
Earth and Planetary Sciences · Environmental Science · #Aquatic Invertebrate Ecology and Behavior #Marine Biology and Ecology Research #Marine Bivalve and Aquaculture Studies

paper · doi:10.1111/j.1463-6409.2007.00316.x

openalex publication_date 2007/12/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29

Abstract

Bayesian and maximum‐likelihood phylogenies of Vetigastropoda (Mollusca: Gastropoda) were reconstructed by separate and combined analyses of one mitochondrial (cytochrome oxidase I, COI) and two nuclear (histone H3 and 18S rRNA) gene sequences, with an emphasis on dense taxonomic sampling. More than 70 vetigastropod species belonging to 13 families and 25 subfamilies constituted a robust clade against the two outgroup clades Neomphalina and Cocculinoidea. The phylogenetically controversial family Seguenziidae appeared as a derived Vetigastropoda and constituted a highly supported clade with eucycline and cataegine trochids, and three skeneimorphs ( Adeuomphalus , Ventsia and Xyloskenea ). These taxa herein treated as the superfamily Seguenzioidea are morphologically very diverse and grouped only by the combination of symplesiomorphies in the shell, radular and head‐foot characters. Anatomical peculiarities of Seguenziidae, including the presence of the penis and seminal receptacle, are all apomorphic conditions independently derived from those in higher gastropod clades, as a consequence of the small size and in response to deep‐sea habitats, where sperm storage seems to be especially beneficial with low numerical density of individuals and limited periodic cues for gametogenesis. Indeed, internal or semi‐internal fertilization has been evolved at least six times in Vetigastropoda, essentially in deep‐sea lineages, with weak phylogenetic constraints. Other new vetigastropod clades with high support values include: Turbinidae + Tegulinae (Trochidae) + Skeneidae s.s. , Clypeosectidae + Lepetodrilidae, Anatominae (Scissurellidae) + Bathyxylophila (Skeneidae) and Lepetodriloidea + Scissurellidae + Bathyxylophila .

Citations

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• Major adaptive radiation in neritopsine gastropods estimated from 28S rRNA sequences and fossil records

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• Morphological, ecological and molecular characterization of the enigmatic planispiral snail genus Adeuomphalus (Vetigastropoda: Seguenzioidea)
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• <p class="HeadingRunIn"><strong>The Family Seguenziidae Verrill, 1884 in the Northeast Pacific, including a comment on excessive numbers of taxonomic data portals</strong></p>
• 3D-interactive microanatomy ofVentsia tricarinataWarén & Bouchet, 1993 (Vetigastropoda: Seguenzioidea) from Pacific hydrothermal vents
• Phylogenetic analysis of the gastropod genus Calliotropis Seguenza, 1902 (Vetigastropoda: Calliotropidae), including fossil and living species
• Calliotropis [wikipedia]
• Chilodontaidae [wikipedia]