| Title | Molecular and morphological phylogeny of Saccocirridae (Annelida) reveals two cosmopolitan clades with specific habitat preferences |
| Abstract | 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. |
| Source | Molecular phylogenetics and evolution (Print) 75, pp. 202–218 |
| Keywords | ProtodrilidaTotal evidenceSystematicsInterstitial habitatsMeiofauna |
| Journal | Molecular phylogenetics and evolution (Print) |
| Editor | Academic Press,, Orlando, FL, Stati Uniti d'America |
| Year | 2014 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.ympev.2014.02.003 |
| Authors | Di Domenico, M.; Martinez, A.; Lana, P.; Worsaae, K. |
| Text | 417487 2014 10.1016/j.ympev.2014.02.003 ISI Web of Science WOS 000335286700016 Protodrilida Total evidence Systematics Interstitial habitats Meiofauna Molecular and morphological phylogeny of Saccocirridae Annelida reveals two cosmopolitan clades with specific habitat preferences Di Domenico, M.; Martinez, A.; Lana, P.; Worsaae, K. Univ Copenhagen; Univ Fed Parana; Univ Estadual Campinas 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. 75 Published version Articolo in rivista Academic Press, 1055 7903 Molecular phylogenetics and evolution Print Molecular phylogenetics and evolution Print Mol. phylogenet. evol. Print Molecular phylogenetics and evolution. Print alejandro.martinezgarcia MARTINEZ GARCIA ALEJANDRO |
