A new species of Labidocera (Copepoda, Calanoida, Pontellidae) from the Arabian Gulf

in Crustaceana
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A new species of marine epiplanktonic copepod of the genus Labidocera Lubbock, 1853 (Calanoida, Pontellidae), Labidocera kuwaitiana sp. nov., is described from the coastal waters of the Arabian Gulf [=Persian Gulf] near Kuwait. The species belongs to the ‘darwinii’ species group because it has an endopod on the left fifth leg of the male, but differs distinctly from other members of the group in having a dorsal process on the genital double-somite in the female and a greatly elongated, toothed process on segments XXI-XXIII at the prehensile antennule in the male. The new species is closely related to L. acutifrons (Dana, 1849), but may be distinguished from L. acutifrons by details of the urosome and fifth leg in the female and details of the fifth leg and prehensile antennule in the male. The size of the eye lenses in Labidocera kuwaitiana sp. nov. males is shortly discussed. A key to the species of the ‘darwinii’ group is presented.

A new species of Labidocera (Copepoda, Calanoida, Pontellidae) from the Arabian Gulf

in Crustaceana

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References

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Figures

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    Labidocera kuwaitiana sp. nov., female. A-E, holotype, F, paratype; A, habitus, dorsal; B, habitus, lateral; C, urosome, dorsal; D, urosome, ventral; E, urosome, left lateral; F, genital double-somite, dorsal. Arrows indicate the dorsally extended process on the genital double-somite. Scale bars = 0.1 mm.

  • View in gallery

    Labidocera kuwaitiana sp. nov., female. A-D, holotype; A, right antennule, lateral view; B, right antennule, articulated segments 1-6 (ancestral segments I-X); C, anterior head with rostrum, ventral; D, anterior head with rostrum, right lateral. Scale bars = 0.1 mm.

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    Labidocera kuwaitiana sp. nov., female. A-D, holotype; A, antenna; B, mandible, gnathobase; C, mandible, palp; D, maxillule. Scale bar = 0.1 mm.

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    Labidocera kuwaitiana sp. nov., female. A-B, holotype; A, maxilla; B, maxilliped. Scale bar = 0.1 mm.

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    Labidocera kuwaitiana sp. nov., female. A-E, holotype; A, P1, anterior; B, P2, anterior; C, P3, anterior; D, P4, anterior; E, P4 basis, posterior. Scale bar = 0.1 mm.

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    Labidocera kuwaitiana sp. nov., female, P5. A, B, holotype; C, D, paratype; A, C, anterior; B, D, posterior. Scale bar = 0.1 mm.

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    Labidocera kuwaitiana sp. nov., male. A-E, allotype; A, habitus, dorsal; B, habitus, lateral; C, urosome, dorsal; D, anterior head with rostrum, lateral; E, anterior head with rostrum, ventral. Scale bars = 0.1 mm.

  • View in gallery

    Labidocera kuwaitiana sp. nov., male, prehensile antennule. A, allotype, whole antennule; B, paratype, articulated segments 9-12 (ancestral segments XIX-XXIV). Scale bars = 0.1 mm.

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    Labidocera kuwaitiana sp. nov., male, P5. A, B, allotype; C, paratype 1; D-F, paratype 2; A, leg with chela closed, posterior; B, right exopod (first and second segments only, third segment is lacking), anterior; C, right exopod, with third segment present, anterior; D, leg with chela open, posterior; E, right exopod, anterior; F, left exopod second segment. Scale bars = 0.1 mm.

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    Position and size of eye lenses in Labidocera kuwaitiana sp. nov. A-C, males, dorsal view; D, female, dorsal view. This figure is published in colour in the online edition of this journal, which can be accessed via http://booksandjournals.brillonline.com/content/journals/15685403.

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