Gobie pygmée guêpe, Wasp pygmygoby, Hime-aogi-haze, ヒメアオギハゼ,

Description
Dorsal spines (total): 7; Dorsal soft rays (total): 7-8; Anal spine: 1; Anal soft rays: 8-9; Pectoral fin rays: 12-15. Pelvic fin rays: I + 5; Lateral ligne scales: 22-26; Transverse scales: 6-9; Depth of body: 4.4-4.6 in SL. Second to fourth rays longest and subequal in length, reaching to interspace between two dorsal fins when adpressed, first ray of dorsal fin usually branched, anterior element of last element branched; Pectoral reaching just posteriorly to a vertical in line from just beyond anal spine to about second segmented ray, rays unbranched; Pelvic fin widely separate with very low connecting membrane, distance between bases of fins; Subequal to base of each pelvic fin; first four rays with one sequential branch, fifth ray with one dichotomous branch (two terminal tips) or rarely unbranched, 40 %-65 % length of fourth ray, which reaches posteriorly to below anal spine to about second segmented ray; Scales on preopercle, opercle and pectoral-fin base cycloid, breast scales cycloid on midline, ctenoid or cycloid to sides, but scale between bases of pelvic fins cycloid, and sometimes anteriormost: 1-2 scales on midline of belly cycloid, remaining scales ctenoid; Scales extending to above middle of eye; Scales below dorsal fin with small accessory scales; Pectoral fin base with two vertical rows of cycloid scales, central scale vertically elongate in anterior row and dorsal-most scale vertically elongate in second row; Prepelvic area with 5-7 rows of cycloid and ctenoid scales. Max. length: 2.3 cm SL. Depth range: 7 - 46 m.

Color
Head and anterior half of body largely yellow with scattered grey spots due to dense concentrations of melanophores; Cheek yellowish-grey; Posterior half of body (from below posterior end of first dorsal fin) grading anteriorly from yellowish grey to black on caudal peduncle; First dorsal fin yellowish to largely grey, with yellowish tinge; second dorsal and anal fins with thin basal black stripe, followed distally by broad yellowish-orange stripe and then a thin submarginal black line; Distal margin of fins white; Caudal fin white; Pelvic fins yellowish-grey, with white outer margin; Pectoral fin a translucent orange.

Etymology
Trimma: from Greek, trimma, -atos = something crushed.
flavatrum: from Latin, flavus = yellow + from Latin, āter = dull black. Name given in allusion to the unusual yellow and black coloration of the species.
Original description: Trimma flavatrum Hagiwara & Winterbottom, 2007 - Type locality: Nishikomi Cave, 28°13'54"N, 129°10'35"E, Amami-Oshima Island, Setouchi Town, Oshima County, Nansei Islands, Kagoshima Prefecture, Japan, depth: 8 meters.

Distribution
Southeastern Indian Ocean, western Pacific: Indonesia, east to Marshall Islands, Fiji and Samoa, north to Japan, south to Rowley Shoals (Western Australia), Queensland (Australia) and New Caledonia.

Biology
Inhabits caves, recesses and overhangs, often hovering upside-down. This species forms small schools which are sometimes mixed with other species.

Last update: 9, April 2023