Mecynocera clausi I.C. Thompson 1888

• Main Author: Bradford-Grieve, Janet M.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2008
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Maxillopoda; Calanoida; Mecynoceridae; Mecynocera; Mecynocera clausi; Corral; Seta; Alfred Wegener Institute
• Online Access: https://zenodo.org/record/6233334; https://doi.org/10.5281/zenodo.6233334

Mecynocera clausi I.C. Thompson, 1888 Mecynocera clausi I.C. Thompson, 1888: 150, pl. 11, figs 1–4. Giesbrecht, 1893: 160, 161, pl. 5, fig. 1, pl. 11, figs 43– 45, pl. 35, figs 21, 22.- Andronov, 1970: 980 –984, figs 1, 2.- Corral, 1972: 37, pl. 11.- Bradford-Grieve 1994: 71, fig. 38. Dolichocera tenuis.- Bernard, 1958: 195, fig. 15 a (not Calocalanus tenuis Farran, 1926). Dolichocerea tenuis.- Bernard, 1963: 160 (not Calocalanus tenuis Farran, 1926). Material examined: 4 males, eastern tropical Atlantic collected by the Alfred Wegener Institute of Polar and Marine Research, Bremerhaven, Germany, ANT XX/ 1, Station 18, 20 o 26 ’S, 0 5 o 55 ’E, 19 November 2002, 0– 300 m. One specimen in formalin (NIWA 45661), two specimens dissected and mounted on slides, one specimen mounted whole on slide (NIWA 45661 / 1-3). Supplementary description of male: Male 0.91 mm total length (Fig. 1 A) Antennules symmetrically developed, neither of them geniculate, with 21 free segments, ancestral segments I–IV, V–VIII, XXVII–XXVIII fused. Antenna (Fig. 2 A) well developed, sexually dimorphic. Basis with 2 setae. Endopod 2 -segmented, segment 1 without setae, segment 2 with 6 + 6 setae. Exopod 6 -segmented, segment 1 short without seta, segment 2 elongate bearing enlarged distal seta, segments 3–6 each with 1 seta. Mandible (Fig. 2 B) with degenerate gnathobase. Palp well developed. Endopod 2 -segmented, segment 1 with 2 setae, segment 2 with 8 setae, 5 of which elongate, exopod with 6 setae. Maxillule (Fig. 2 C) reduced with degenerate inner lobes and endopod with 2 small setae. Exopod with 8 setae, praecoxal epipodite with 6 large setae. Maxilla (Fig. 2 D) reduced to a small, knob-like remnant. Maxilliped (Fig. 2 E) sexually dimorphic. Inner setae of syncoxa, basis and endopod segments absent or very reduced; 1 terminal and 2 outer endopod setae enlarged, plumose, 2 outer setae directed towards base of limb as is typical of Paracalanidae, Calanidae and Eucalanidae. Leg 1 (Fig. 1 B) endopod indistinctly 2 -segmented, segment 1 ...