Comparative anatomy of siphons in tellinoidean clams (Bivalvia, Tellinoidea)

Autor(es)

Batistao, Alan R. ; Audino, Jorge A. ; Passos, Flavio D.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Morphology; v. 285, n. 8, p. 17-pg., 2024-08-01.

Resumo

Siphons are tubular organs formed by fusion and posterior extension of the marginal mantle folds. They are supposed to have performed key roles in the evolution of bivalves by enabling these animals to occupy several ecological niches. However, anatomical details of these organs are scarce for one of the most diverse lineages of tropical bivalves, the superfamily Tellinoidea. We investigated the siphonal morphology of 15 species, sampling five tellinoidean families, by integrating scanning electron microscopy, confocal microscopy, and histology. The siphons revealed variations in length, pigmentation, tentacles, papillae, and number of nerve cords. Due to the presence of sensorial structures, such as papillae and tentacles, we reclassify the siphons of Tellinoidea from type A to A+. Additional anatomical patterns were identified at family and genus levels. For example, the incurrent siphon shorter than the excurrent and 24 tentacles are putative synapomorphies of Donacidae. We also highlight shared siphonal traits between Donacidae and Solecurtidae as well as between Semelidae and Tellinidae. In addition, our data support the idea of Psammobiidae as a paraphyletic lineage. Overall, we provide an extensive comparative data set on siphonal traits with significant relevance for bivalve taxonomy, functional anatomy, and evolutionary investigations. A detailed investigation of siphonal traits in tellinoidean bivalves, by means of integrative microscopy techniques, provided a comparative data set to discuss functional morphology, evolutionary relationships, and taxonomy of this diverse group of tropical bivalves. The main contributions are the reclassification of siphons of Tellinoidea from type A to A+, putative synapomorphies of Donacidae, and the description of two siphonal architectures, one shared by Donacidae and Solecurtidae, and another shared by Semelidae and Tellinidae. image (AU)

• Processo FAPESP: 19/18834-1 - Diversidade e evolução de sistemas sensoriais em Bivalves: uma abordagem funcional unificada com base em transcriptoma comparativo e microscopia integrativa
• Beneficiário: Jorge Alves Audino
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 22/12606-0 - Do frio para o calor: enriquecendo as coleções de moluscos antárticos da UNICAMP
• Beneficiário: Flávio Dias Passos
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Regular
• Processo FAPESP: 21/00994-2 - Os sifões de Tellinoidea (Mollusca: Bivalvia): uma abordagem anatômico-evolutiva
• Beneficiário: Alan Rodrigo Batistão
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 22/13918-5 - Filogenia molecular e diversidade sifonal da superfamília Tellinoidea (Mollusca, Bivalva)
• Beneficiário: Alan Rodrigo Batistão
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Mestrado
• Processo FAPESP: 18/10313-0 - Consolidação de coleções científicas de invertebrados marinhos: estratégias para conservação da biodiversidade
• Beneficiário: Antonia Cecília Zacagnini Amaral
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático