Gnathia hamletgast N & Bruce, 2012, sp. nov.

• Main Authors: N, Jörundur Svava R S S O, Bruce, Niel L.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2012
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Gnathiidae; Gnathia; Gnathia hamletgast; Bennett Island
• Online Access: https://doi.org/10.5281/zenodo.6172563; http://treatment.plazi.org/id/357665490E4DFF8EFF7429B9FC9AEFA9

Gnathia hamletgast sp. nov. (Figs 8–9) Material examined. Holotype. 3, 2.6 mm, Bennett Island, Chesterfield reefs, northern reef, 8 May 1979, coral rock, lagoon, coll. N. L. Bruce (MTQ W10740). Description. Body 3.2 times as long as greatest width, widest at pereonite 3; dorsal surfaces polished, sparsely setose. Cephalosome quadrate, 0.8 as long as wide, lateral margins convex; dorsal surface with sparse granules; dorsal sulcus narrow, shallow, extended; translucent region absent; paraocular ornamentation strongly developed, posteromedian tubercle present. Frontolateral processes present. Frontal margin convex, median point with process. External scissura present, narrow, deep. Mediofrontal process present, strong, spatuloid, bifid, without ventral notch, without fine setae. Supraocular lobe pronounced, wide; accessory supraocular lobe not pronounced. Superior frontolateral process present, strong, unequally apically bifid, with 2 long simple setae. Inferior frontolateral process present, apically unequally bifid, without setae. Mesioventral margin straight. Eyes present, elongate, 0.3 as long as cephalosome length, contiguous with head surface, ommatidia arranged in rows, eye colour dark brown. Pereon lateral margins subparallel, with few setae; anteriorly smooth. Pereonite 1 not fused dorsally with cephalosome; dorsolateral margins fully obscured by cephalosome; pereonite 2 wider than pereonite 1; areae laterales absent on pereonite 5; pereonite 6 without lobi laterales; lobuii well-developed, globular. Mandibl e 0.6 as long as width of cephalosome, mandible triangular, weakly curved, evenly; mandible apex 20% total length; mandibular seta present. Carina present, smooth, along entire length. Incisor knob-like, distal denticulation absent. Blade present, dentate, with distinct angle, convex, along proximal 50% of margin. Pseudoblade absent; internal lobe present, rounded, large, smooth; dorsal lobe absent; basal neck short; erisma absent; lamina dentata absent. Pereopods 2–6 without long plumose setae; ...