| Summary: | Byblisoides monicae n. sp. (Figs. 1–5) Type material . Holotype: NIWA 18651, ovigerous female (many eggs), 29 mm, Ross Sea, Antarctica, 75.6333°S 168.5333°E, 407 m, 17/01/1959, NZOI stn A460. Paratype: NIWA 126934, male, 25 mm, collected with holotype. No other ampeliscids were recorded from this station. Other material examined . NIWA 42763, 1 specimen, Ross Sea Antarctica, 75.6217°S 169.8045°E, 520–522 m, 14/02/2008, TAN0802/61, shelf, mud; NIWA 42765, 1 specimen, Ross Sea, Antarctica, 75.6205°S 169.8113°E, 520–522 m, 14/02/2008, TAN0802/61, shelf, mud. Ampelisca barnardi Nicholls, 1938 and an undescribed species of Ampelisca were also recorded from this station. Diagnosis . Anteroventral corner of head acute, produced to length of anterior margin of head. Antenna 1 short, reaching to three-fourths of antenna 2 peduncle article 4, flagellum with 3 articles. Coxa 1 ventral margin angled anteriorly, uneven. Pereopod 5 basis posterior margin uneven, sinuous. Pereopod 7 carpus anterior margin without plumose setae. Pereopod 7 basis posteroventral corner rounded. Uropod 2 inner ramus bearing marginal robust setae. Description . Based on holotype female, 29 mm length. Head anteroventral corner produced forward, reaching almost level with anterodorsal corner, anterior margin, excavate at antenna 2 insertion, antennal lobe concave, with 2 acute points, rostrum absent, head longer than deep, ventral margin straight. Antenna 1 short, reaching to just past half length of antenna 2 peduncle article 4; peduncle article 1 subequal in length to article 2 (1.1 ×), article 2 longer than article 3 (> 4 ×), article 3 shorter than article 1 (0.2 ×); flagellum shorter than peduncle, comprising of 3 articles (article 3 longest), ventral margin of peduncle article 1 and both margins of flagellum with long plumose, slender setae. Antenna 2 comparatively stout, reaching to just under half of body length; 1.8 × length of head; peduncular article 4 subequal in length to article 5, article 5 ventral and dorsal margin slightly serrate, ...
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