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Di Domenico, Maikon; Martínez, A.; Lana, Paulo; Worsaae, Katrine. (2014). Molecular and morphological phylogeny of Saccocirridae (Annelida) reveals two cosmopolitan clades with specific habitat preferences. Molecular Phylogenetics and Evolution. 75: 202-218.
347650
10.1016/j.ympev.2014.02.003 [view]
Di Domenico, Maikon; Martínez, A.; Lana, Paulo; Worsaae, Katrine
2014
Molecular and morphological phylogeny of Saccocirridae (Annelida) reveals two cosmopolitan clades with specific habitat preferences
Molecular Phylogenetics and Evolution
75: 202-218
Publication
World Polychaeta Database (WPolyDb)
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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.
Molecular systematics, Molecular biology
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Pharyngocirrus Di Domenico, Martínez, Lana & Worsaae, 2014 (original description)
Pharyngocirrus burchelli (Silberbauer, 1969) (new combination reference)
Saccocirrus Bobretzky, 1872 (taxonomy source)
Saccocirrus alanhongi Bailey-Brock, Dreyer & Brock, 2003 accepted as Pharyngocirrus alanhongi (Bailey-Brock, Dreyer & Brock, 2003) (new combination reference)
Saccocirrus archboldi Kirsteuer, 1967 accepted as Pharyngocirrus archiboldi (Kirsteuer, 1967) (new combination reference)
Saccocirrus burchelli Silberbauer, 1969 accepted as Pharyngocirrus burchelli (Silberbauer, 1969) (new combination reference)
Saccocirrus eroticus Gray, 1969 accepted as Pharyngocirrus eroticus (Gray, 1969) (new combination reference)
Saccocirrus gabriellae Marcus, 1946 accepted as Pharyngocirrus gabriellae (Marcus, 1946) (new combination reference)
Saccocirrus goodrichi Jouin-Toulmond & Gambi, 2007 accepted as Pharyngocirrus goodrichi (Jouin-Toulmond & Gambi, 2007) (new combination reference)
Saccocirrus jouinae Brown, 1981 accepted as Pharyngocirrus jouinae (Brown, 1981) (new combination reference)
Saccocirrus krusadensis Alikuhni, 1948 accepted as Pharyngocirrus krusadensis (Alikuhni, 1948) (new combination reference)
Saccocirrus labilis Yamanishi, 1973 accepted as Pharyngocirrus labilis (Yamanishi, 1973) (new combination reference)
Saccocirrus sonomacus Martin, 1977 accepted as Pharyngocirrus sonomacus (Martin, 1977) (new combination reference)
Saccocirrus tridentiger Brown, 1981 accepted as Pharyngocirrus tridentiger (Brown, 1981) (new combination reference)
Saccocirrus uchidai Sasaki, 1981 accepted as Pharyngocirrus uchidai (Sasaki, 1981) (new combination reference)
Pharyngocirrus burchelli (Silberbauer, 1969) (new combination reference)
Saccocirrus Bobretzky, 1872 (taxonomy source)
Saccocirrus alanhongi Bailey-Brock, Dreyer & Brock, 2003 accepted as Pharyngocirrus alanhongi (Bailey-Brock, Dreyer & Brock, 2003) (new combination reference)
Saccocirrus archboldi Kirsteuer, 1967 accepted as Pharyngocirrus archiboldi (Kirsteuer, 1967) (new combination reference)
Saccocirrus burchelli Silberbauer, 1969 accepted as Pharyngocirrus burchelli (Silberbauer, 1969) (new combination reference)
Saccocirrus eroticus Gray, 1969 accepted as Pharyngocirrus eroticus (Gray, 1969) (new combination reference)
Saccocirrus gabriellae Marcus, 1946 accepted as Pharyngocirrus gabriellae (Marcus, 1946) (new combination reference)
Saccocirrus goodrichi Jouin-Toulmond & Gambi, 2007 accepted as Pharyngocirrus goodrichi (Jouin-Toulmond & Gambi, 2007) (new combination reference)
Saccocirrus jouinae Brown, 1981 accepted as Pharyngocirrus jouinae (Brown, 1981) (new combination reference)
Saccocirrus krusadensis Alikuhni, 1948 accepted as Pharyngocirrus krusadensis (Alikuhni, 1948) (new combination reference)
Saccocirrus labilis Yamanishi, 1973 accepted as Pharyngocirrus labilis (Yamanishi, 1973) (new combination reference)
Saccocirrus sonomacus Martin, 1977 accepted as Pharyngocirrus sonomacus (Martin, 1977) (new combination reference)
Saccocirrus tridentiger Brown, 1981 accepted as Pharyngocirrus tridentiger (Brown, 1981) (new combination reference)
Saccocirrus uchidai Sasaki, 1981 accepted as Pharyngocirrus uchidai (Sasaki, 1981) (new combination reference)
Authority
The original author is Bobretzky, as from Bobretzky, 1872: 249 where he mentions Saccocirridae in text flow in ... [details]
Etymology
authors: "From the Latin, ‘‘Pharyngo’’ (pharynx), as a reference to the characteristic ventral pharynx; ... [details]
Taxonomy
Di Domenico et al (2014) split the genus on morphology and molecules and habitat, with members of the former ... [details]
