300 million years apart: the extreme case of macromorphological skeletal convergence between deltocyathids and a turbinoliid coral (Anthozoa, Scleractinia)

Autor(es)

Vaga, C. F. ; Seiblitz, I. G. L. ; Stolarski, J. ; Capel, K. C. C. ; Quattrini, A. M. ; Cairns, S. D. ; Huang, D. ; Quek, R. Z. B. ; Kitahara, M. V.

• Tipo de documento: Artigo Científico
• Fonte: INVERTEBRATE SYSTEMATICS; v. 38, n. 4, p. 13-pg., 2024-01-01.

Resumo

The integration of morphological and molecular lines of evidence has enabled the family Deltocyathidae to be erected to accommodate Deltocyathus species that were previously ascribed to the family Caryophylliidae. However, although displaying the same morphological characteristics as other species of Deltocyathus, molecular data suggested that D. magnificus was phylogenetically distant from Deltocyathidae, falling within the family Turbinoliidae instead. To elucidate the enigmatic evolutionary history of this species and skeletal microstructural features, the phylogenetic relationships of Deltocyathidae and Turbinoliidae were investigated using nuclear ultraconserved and exon loci and complete mitochondrial genomes. Both nuclear and mitochondrial phylogenomic reconstructions confirmed the position of D. magnificus within turbinolids. Furthermore, a novel mitochondrial gene order was uncovered for Deltocyathidae species. This gene order was not present in Turbinoliidae or in D. magnificus that both have the scleractinian canonical gene order, further indicating the taxonomic utility of mitochondrial gene order. D. magnificus is therefore formally moved to the family Turbinoliidae and accommodated in a new genus (Dennantotrochus Kitahara, Vaga & Stolarski, gen. nov.). Surprisingly, turbinolids and deltocyathids do not differ in microstructural organisation of the skeleton that consists of densely packed, individualised rapid accretion deposits and thickening deposits composed of fibres perpendicular to the skeleton surface. Therefore, although both families are clearly evolutionarily divergent, macromorphological features indicate a case of skeletal convergence while these may still share conservative biomineralisation mechanisms. (AU)

• Processo FAPESP: 14/01332-0 - Filogenômica da ordem Scleractinia (Cnidaria, Anthozoa): relações entre evolução da ordem e mudanças climáticas
• Beneficiário: Marcelo Visentini Kitahara
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Jovens Pesquisadores
• Processo FAPESP: 21/06866-6 - Integrando ferramentas e disciplinas para entender o futuro dos corais de águas rasas do Atlântico Sul Ocidental em um planeta em mudanças
• Beneficiário: Marcelo Visentini Kitahara
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores - Fase 2