Material: 1 adult specimen, holotype (MNHNPy 1027), station DW 47, East coast of Taiwan, N/ O 'Fishery Researcher 1 ', TAIWAN 2000, 22º56.0'N 121 º 25.6 'E, 498 m; 02/08/ 2000, coll. Bouchet, RicherIRD & Chan.
Description: a comparatively small Colossendeis, trunk (Fig. 3 A, B) typical of the genus, glabrous, unarticulated and without tubercles on lateral processes or anterior of cephalon; lateral processes separated by less than their own diameter. Ocular tubercle a tall dome bearing a distal pointed “spire”; anterior eyes evident, unpigmented. Abdomen fusiform, held above the horizontal, extending to tip of first coxa of fourth leg. Proboscis longer than trunk, widest at onethird its length, thence tapering rapidly distally (form C 2 of Fry and Hedgpeth, 1969); initially rising from the cephalon, distally turning down.
Palp (Fig. 3 A) of 10 articles, third and fifth articles (P 3 and P 5) of equal length, P 6 to P 10 subequal. Oviger of 10 articles, articles 4 and 6 elongate, slender; strigilis (Fig. 3 C)with simply crenulate compound spines on articles 7 to 10, terminal claw nearly half length of tenth article, not forming pseudochela, but with flattened expansion along ventral margin.
Third leg (Fig. 3 D, E) coxae subequal, naked; long articles sparsely setose, femur shorter than first tibia, second tibia longest; tarsus twothirds length of propodus, main claw one quarter length of propodus, these three together one fifth length of second tibia (‘brevitarsal’).
Measurements of holotype (mm): trunk length (anterior of cephalon to tip of 4 th lateral process) 4.1; width across 2 nd lateral processes 1.7; proboscis length 5.33; palp article 3 (P 3) 2.35, P 5 2.35, P 6 0.66, P 7 0.66, P 8 0.55, P 9 0.55, P 10 0.66; third leg, first coxa 0.59, second coxa 0.6, third coxa 0.59, femur 9.5, first tibia 12.24, second tibia 13.53, tarsus 1.0, propodus 1.5, main claw 0.4.
Etymology: from the Greek ‘ mykterismos ’, meaning ‘turning up the nose, sneering’, alluding to the holotype holding its proboscis in a raised position (adjective).
Remarks: There is no described species of Colossendeis with sixth and seventh palp articles subequal and tarsus twothirds of the propodus length. With the third and fifth palp articles subequal, and a narrowly tapering proboscis, the present species resembles the Melanesian species C. pipetta and C. sinuosa; however, both of those species have their proboscides distally tubular, and tarsus longer than propodus. Gonopores were not evident, so the gender of the present specimen is not known.