{"refrec":{"BRefID":122148,"RR":"<b>Martin, D.; Gil, J.; Carreras-Carbonell, J.; Bhaud, M.R.</b> (2008). Description of a new species of <i>Mesochaetopterus</i> (Annelida, Polychaeta, Chaetopteridae), with redescription of <i>Mesochaetopterus xerecus</i> and an approach to the phylogeny of the family. <i>Zool. J. Linn. Soc. 152(2)</i>: 201-225. <a href=\"https://dx.doi.org/10.1111/j.1096-3642.2007.00342.x\" target=\"_blank\">https://dx.doi.org/10.1111/j.1096-3642.2007.00342.x</a>","BEntID":116228,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Zool. J. Linn. Soc. 152(2)</i>: 201-225. <a href=\"https://dx.doi.org/10.1111/j.1096-3642.2007.00342.x\" target=\"_blank\">https://dx.doi.org/10.1111/j.1096-3642.2007.00342.x</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Martin, D.; Gil, J.; Carreras-Carbonell, J.; Bhaud, M.R.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Martin, D. <i>et al.</i>","Englishabstract":"<i>Mesochaetopterus rogeri</i> sp. nov., a new large chaetopterid polychaete from the Mediterranean Sea, is described. The analyses of partial sequences from the nuclear 18S rRNA (643 bp) and the mitochondrial cytochrome oxidase I (577 bp) genes of representative individuals of all known chaetopterid genera indicated the initial assignment of the new species into <i>Mesochaetopterus</i>. These analyses also supported the monophyly of the family and revealed two well-supported clades: <i>Chaetopterus/Mesochaetopterus</i> and <i>Spiochaetopterus/Phyllochaetopterus. Mesochaetopterus rogeri</i> sp. nov. is close to <i>Mesochaetopterus xerecus</i>, which is redescribed here from newly collected material. <i>Mesochaetopterus rogeri</i> sp. nov. was characterized as follows: (1) two long tentacles with dorsal transversal black bands of alternating widths (sometimes with two additional longitudinal light-brown bands); (2) region A with nine chaetigers (up to 12), with 13-19 modified chaetae in the fourth chaetiger; (3) region B with three flat segments, with accessory feeding organs in the second and third segments; (4) sandy straight tubes, 2.5-m long or more, vertically embedded in the sand. In the Bay of Blanes, <i>M. rogeri</i> sp. nov. occurs between 6- and 9-m deep (but also up to 30-m deep), in a patchy distribution (< 1 individual m<sup>-2</sup>), with maximum densities in April/June (likely to be the result of recruitment events), and minimum densities in September/November (likely to be a behavioural response to increasing sediment dynamics). Although it was originally thought that <i>M. rogeri</i> sp. nov. could be an introduced species, we argue that it is probably a native of the Mediterranean that has been overlooked by scientists up to now. 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