Filling a blank in bivalve taxonomy: an integrative analysis of Cyamioidea (Mollusca: Bivalvia)

Abstract This contribution provides the first integrative study of Cyamioidea, a group of bivalves largely neglected in the past. By combining information obtained from shell morphology, gross anatomy, histology, reproductive biology and DNA sequencing, the distinctive characters of Cyamioidea are d...

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Bibliographic Details
Published in:Zoological journal of the Linnean Society 2020-10, Vol.190 (2), p.558-591
Main Authors: Zelaya, Diego G, Güller, Marina, Ituarte, Cristián
Format: Article
Language:English
Subjects:
Animal embryos
Biology
Bivalvia
Cyamiidae
Cyamioidea
DNA sequences
DNA sequencing
Embryos
Epithelium
Filaments
Gametocytes
Gills
Histology
Mollusks
Morphology
Oocytes
Spawning
Taxonomic revision
Taxonomy
Veneroidea
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Summary:Abstract This contribution provides the first integrative study of Cyamioidea, a group of bivalves largely neglected in the past. By combining information obtained from shell morphology, gross anatomy, histology, reproductive biology and DNA sequencing, the distinctive characters of Cyamioidea are determined, and the taxa belonging to this superfamily are revised. Gaimardioidea, previously considered as a distinct superfamily, is reduced to family level (Gaimardiidae), which, along with Cyamiidae, are assigned to Cyamioidea. All studied cyamioideans share a common reproductive character: the presence of a true follicular epithelium surrounding each developing oocyte, which persists after spawning, surrounding the developing embryos and participating in their anchorage to the gill filaments. Several morphological and anatomical characters support the distinction of Gaimardiidae and Cyamiidae. Based on that information, the placement of Gaimardia and Kidderia in Gaimardiidae, and that of Cyamiocardium, Cyamiomactra, Cyamium, Heteromactra, Pseudokelly, Ptychocardia and Reloncavia in Cyamiidae, is confirmed. Jukesena, historically placed in Veneroidea, is here allocated to Cyamiidae. Neoleptonidae, previously also attributed to Cyamioidea, are reallocated to Veneroidea.
ISSN:0024-4082
1096-3642
DOI:10.1093/zoolinnean/zlz144