Leucon (Crymoleucon) breidensis, Gamo, 1987

Mühlenhardt-Siegel, Ute, 2011, New and known species of the family Leuconidae (Cumacea, Peracarida) from Antarctic deep-sea basins 3117, Zootaxa 3117 (1), pp. 1-68 : 14

L. (C.) breidensis Gamô, 1987

Previous records. described for Breid Bay ( Princess Ragnhild Coast) (275–289 m). Diagnosis. Close to L. sagitta but carapace much longer than the first four free thoracic segments combined

(equal in length in L. sagitta ) and with a distinct large ocular lobe. New records. ( Figures 8–10 ) E Weddell Sea: ANDEEP III #81: 1 subadult male, 1 female with developed oostegites, 2 subadult females; W Weddell Sea: ANDEEP III #133: 19 specimens, ZMH K 42934 . Morphometric measurements: Antenna 1: relative length of peduncle articles 1 to 3: 41/29/30; maxilliped 3: B/ R ratio 1.5, relative length of articles I to D: 9/24/29/20/18; pereiopod 1: broken off after basis; pereiopod 2: B/ R ratio 0.8, relative length of articles I to D: 4/21/26/16/33; pereiopod 3: B/ R ratio 1.1, relative length of articles I to D: 18/31/25/18/8; pereiopod 4: B/ R ratio 1.2, relative length of articles I to D: 16/24/40/16/4; pereiopod 5: B/ R ratio 0.7, relative length of articles I to D: 14/23/37/19/7. Uropod measurements: pleotelson length to width: 1.2; pleotelson 0.8 times as long as uropod peduncle; uropod endopod shorter than exopod; uropod endopod basal to distal article: 2.0 .

Figures

FIGURE 8. Leucon (C.) cf. breidensis Gamô, 1987, SEM photos Carapace and free thoracic segments (above), antennal notch (middle), dorsomedian serration (below).

FIGURE 9. Leucon (C.) cf. breidensi Gamô, 1987s, A1: antenna 1, Mxp2: maxilliped 2, Mxp3: maxilliped 3, P1: pereiopod 1 (broken after basis), P2: pereiopod 2, P3: pereiopod 3; scale bars: 50 µm (A1) and 200 µm (Mxp3, P1, P2, P3); scale bars: 200 µm.

FIGURE 10. Leucon (C.) cf. breidensis Gamô, 1987, P4: pereiopod 4, P5: pereiopod 5, U: pleotelson and right uropod.