Molecular and morphological phylogeny of Saccocirridae (Annelida) reveals two cosmopolitan clades with specific habitat preferences

Autor(es)

Di Domenico, M. ^[1] ; Martinez, A. ^[2] ; Lana, P. ^[3] ; Worsaae, K. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Copenhagen. Dept Biol

^[2] Univ Copenhagen. Dept Biol

^[3] Univ Fed Parana. Ctr Marine Studies

^[4] Univ Copenhagen. Dept Biol

• Tipo de documento: Artigo Científico
• Fonte: Molecular Phylogenetics and Evolution; v. 75, p. 202-218, JUN 2014.
• Citações Web of Science: 21

Resumo

Saccocirrids are tiny, slender annelids inhabiting the interstices among coarse sand sediments in shallow waters. The 22 nominal species can be grouped into two morphological groups ``papillocercus{''}and ``krusadensis{''}, based on the absence/presence of a pharyngeal bulbus muscle, absence/presence of ventral ciliary patterns, bilateral/unilateral gonad arrangement and chaetal differences. We present herein the first phylogenetic analyses of Saccocirridae based on four molecular markers and 34 morphological characters, employing maximum likelihood and Bayesian methods. All analyses confirmed the monophyly of each morphological group with high nodal support. As a consequence and based on several apomorphic characters, a new genus, Pharyngocirrus gen. nov., is erected for the ``krusadensis{''}clade. Remarkably, the habitat preferences and trophic guilds are also shown to differ between the two genera, yet show strong consistency within each group. Geographic distribution analyses underscore the family preference for subtropical areas, but reject the previously proposed restriction of Pharyngocirrus gen. nov. to the Indo-Pacific. The finding of two morphologically diverging, cosmopolitan sister clades with different habitat preferences suggest an early ecological diversification of the family, conserved during the later evolution, speciation processes and dispersal of the family. (C) 2014 Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 13/04358-7 - Evolução e morfologia 3D dos apêndices prostomiais (palpos) e glândulas epidérmicas de anelídeos intersticiais, com ênfase nas famílias saccocirridae e protodrilidae
• Beneficiário: Maikon Di Domenico
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 12/08581-0 - Anelídeos intersticiais: sistemática e filogenia de uma fauna negligenciada
• Beneficiário: Maikon Di Domenico
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado