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A new deep-sea genus and species of the family Asterocheridae (Copepoda, Siphonostomatoida) from the continental margin off Angola (East Equatorial Atlantic)

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Gerulusosacculus commutabilis, a new genus and species of the family Asterocheridae Giesbrecht, 1899 (Copepoda: Siphonostomatoida) is described, based on specimens collected with a bottom trawl from the continental margin off equatorial Africa (Angola) at a depth of 1288-1289 m. The new genus is added to a group of 9 genera of asterocherids (Australomyzon Nicholls, 1944; Bythocheres Humes, 1988; Cheramomyzon Humes, 1989; Collocheres Canu, 1893; Collocherides Stock, 1971; Dermatomyzon Claus, 1889; Glyptocheres Humes, 1987; Ophiurocheres Humes, 1998; Rhynchomyzon Giesbrecht, 1895), which is distinguished by the 5-segmented urosome in the female and the 6-segmented urosome in the male. Gerulusosacculus differs from all other genera in this group in having an elongate body, a dorso-ventrally flattened prosome, the genital somite of female and male 2.3 times as wide as long, the rostrum with a broad edge, the terminal claw of the antenna and of the maxilliped divided into two parts by a transverse suture, the swimming legs 1-4 with slender setae bearing short setules, the lobe-like leg 5, and the elongate caudal rami. The variability and the asymmetry of the armature of the swimming legs 2-4 are additional remarkable features of G. commutabilis. Gerulusosacculus commutabilis, une espèce nouvelle d'un genre nouveau, de la famille des Asterocheridae Giesbrecht, 1899 (Copepoda, Siphonostomatoida) est décrite, à partir de femelles et mâles récoltés à l'aide d'un chalut, au large de l'Afrique équatoriale (Angola) à la profondeur de 1288-1289 m. Le nouveau genre s'ajoute à un groupe de 9 genres (Australomyzon Nicholls, 1944; Bythocheres Humes, 1988; Cheramomyzon Humes, 1989; Collocheres Canu, 1893; Collocherides Stock, 1971; Dermatomyzon Claus, 1889; Glyptocheres Humes, 1987; Ophiurocheres Humes, 1998; Rhynchomyzon Giesbrecht, 1895) qui se distinguent par l'urosome de la femelle à 5 somites et l'urosome du mâle à 6 somites. Gerulusosacculus diffère de tous les genres de ce groupe en possédant un corps allongé, un prosome aplati dorso-ventralement, le somite génital chez la femelle et le mâle 2,3 fois plus large que long, un rostre à bord large, la griffe terminale de l'antenne et du maxillipède divisé en deux parties, les pattes 1-4 pourvues de soies grêles portant de courtes sétules, une P5 en forme de lobe et de longues rames furcales. La variabilité notable et l'asymétrie de l'armature des pattes natatoires 2-4 constituent un caractère remarquable de G. commutabilis.

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/content/journals/10.1163/1568540042900286
2004-10-01
2016-12-05

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