Labriphimedia meikae sp. nov.

Figs 2-6

urn:lsid:zoobank.org:act: BD138120-DFEB-4939-8848-7E6D79EE9B4C

Material examined

Holotype

♂, 6 mm, NIWA 84598.

Additional material

Two paratypes of unknown sex, 5.2 mm and 5 mm, NIWA 31826, same station data as holotype.

Locus typicus

NEW ZEALAND: TAN0705/251, 24 April 2007, 42°59ˮ45’ S, 178°59ˮ44’ E – 42°59ˮ28’ S, 179°0ˮ19’ E, 520- 530 m.

Etymology

This species is named for Ms Meike Snyder, the dear aunt of the senior author.

Description

LENGTH. Based on male holotype, 6 mm.

HEAD (Fig. 2A). Eyes reniform; rostrum only weakly curved; anterior margin with small rounded sculptured spine (which looks pointed in dorsal view), anteroventral corner with rounded lobe. Antenna 1 (Fig. 2B) peduncular article 1 with a long posteroventral spine reaching the distal margin of the peduncular article 2 and a shorter dorsal spine; peduncular article 2 with short spine; peduncular article 3 and flagellum unknown. Antenna 2 (Fig. 2D) peduncular article 2 with short rounded gland cone and longer bifid medial process; peduncular article 4 slightly drawn out laterally; peduncular article 5 and flagellum unknown. Upper lip (Fig. 2G) wider than long, emarginate. Mandibles (Fig. 2E) with smooth incisors and a spine-like lacinia mobilis on the left mandible (the right mandible apparently does not have a lacinia mobilis); palp 3-articulate, ratios of articles 1-3 1:1.4:1.2. Lower lip (Fig. 2C) inner lobes absent, distally rounded. Maxilla 1 (Fig. 3A) inner plate with 6 plumose setae on the inner margin; outer plate with 11 spine-like serrate setae; palp 2-articulate, well developed, longer than outer plate, with 9 apical setae. Maxilla 2 (Fig. 2F) inner plate slightly shorter and subequal in width compared to outer plate. Maxilliped (Fig. 3 B-E) inner plate long, rectangular with slender plumose setae apically and 2 rows mediomarginally; outer plate with tapering apex, bordered with plumose setae; palp article 1 as long as articles 2 and 3 combined; article 2 weakly produced medially, not guarding along article 3; there may be an inconspicuous 4th article.

PEREON (Fig 2A). Pereonite 1 enlarged, about 3-4 x as long as pereonite 2. Pereonites 5-7 with pointed and drawn out posteroventral angles. Pereonite 7 without mid-dorsal carina, dorsodistal margin with 2 large narrow pointed spines, space between spines wide. Gnathopod 1 (Fig. 4A) coxa ventrally acute, ventral and anterior margin smooth apart from 2 minute notches with microtrichs; basis longest; ischium elongate, slightly longer than merus; carpus slightly longer than propodus; dactylus and propodus forming a chela, inner margin of dactylus serrate apically; setation, apart some setae on basis, only on chela. Gnathopod 2 (Fig. 4B) larger than gnathopod 1; coxa ventrally acute, ventral and anterior margin smooth apart from 2 minute notches with microtrichs; basis longest, ischium longer than merus; merus expanded distally; carpus and propodus subequal in length; propodus with groups of setae posteromarginally and apically; distal propodus extension wider than dactylus; chelate. Pereopod 3 (Fig. 5A) coxa longer than preceding coxae, posteroventrally acute, ventral margin apart from 2 minute notches with microtrichs smooth; basis and ischium with rounded lobe on apical margin. Pereopod 4 (Fig. 5B) coxa pointed distally and posteromarginally, ventral margin smooth apart from some minute notches with microtrichs; basis and ischium with rounded lobe on apical margin. Pereopod 5 (Fig. 5C) coxa with long pointed posteroventral spine; basis posterior margin with 2 spines: posterodorsal spine pointed, posteroventral corner subquadrate; posterior margin weakly serrate; ischium anterodistally pointed; merus posteroventral lobe elongate; carpus to dactylus unknown. Pereopod 6 (Fig. 6A) of similar shape as pereopod 5, but basis wider with a pointed posteroventral corner and bearing an angular posterodorsal process. Pereopod 7 (Fig. 6 B-C) coxa small with pointed posteromarginal spine; basis posteroventrally with spine, directed ventrally, posterior margin weakly serrate; merus posteroventral lobe elongate.

PLEON (Fig. 2A). Pleonite 1 without mid-dorsal carina, with 2 large, pointed spines, space between spines widely excavate, similar to the arrangement on pereonite 7. Epimeron 1 posterior margin with 1 mid-lateral spine, posteroventral corner with short point. Pleonite 2 without mid-dorsal carina; with 2 large, pointed spines, space between spines wide. Epimeron 2 posterior margin with 1 mid-lateral spine, posteroventral corner pointed. Pleonite 3 without mid-dorsal carina; dorsodistal margin with 2 straight spines, shorter than those on pereonite 7 and pleonites 1-2. Epimeron 3 posterior margin with 1 well developed lateral, smooth spine, posteroventral corner produced into smooth spine. Urosomite 1 longest, smooth. Urosomite 2 shortest. Telson (Fig. 6G) emarginate.

Distribution

Chatham Rise, New Zealand (South-western Pacific), 520- 530 m.