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hayashii in having a shorter basal membrane (< 20 vs.
Diagnosis: Trimma habrum is characterized by a bony interorbital as wide as the diameter of the pupil, 8-9 scales in the predorsal midline, 14 unbranched pectoral fin rays, an unbranched fifth pelvic fin ray, no basal membrane joining the fifth pelvic fin rays across the midline, a single full row of cheek scales and sometimes one or two small scales above this row, three rows of scales covering the upper two-thirds of the opercle, and no trace of dark or black pigmentation on the caudal peduncle when preserved.
28), all rays branched except posterior element of last ray, which extends posteriorly for about one-third of distance between its base and first ventral procurrent ray; pectoral fin 14, all rays unbranched, fin reaching posteriorly to a vertical line above a line between urogenital papilla and anal spine; pelvic fin I 5, no frenum, basal membrane absent, first four rays with one sequential branch, fifth ray unbranched and 44-46-52% length of fourth ([bar.
66) unbranched dorsal and ventral rays respectively, middle rays branched, fin reaching posteriorly to a vertical line between middle of urogenital papilla and base of anal spine; pelvic fin I 5, no frenum, basal membrane 25-55% length of fourth ray (n = 15, high variance probably due to delicate nature of membrane, which is easily torn), first four rays with 2-4 sequential branch points, fifth ray branched branched twice dichotomously and 59-68-76% length of fourth (x = 67.
It has 9 dorsal and 8 anal fin rays, 18-19 pectoral rays with the middle ones branched, a single branch point in the fifth pelvic fin ray, which is about 60-70% the length of the fourth, and a basal membrane about 10-20% the length of the fourth ray, 10-11 anterior and 8-9 posterior transverse scale rows, 5-10 scales in the predorsal midline, no cheek scales and a single row of 3 scales on the upper margin of the opercle, and a shallow interorbital trench with no trench posterodorsal to the orbit.
5 mm SL juvenile), middle rays branched, fin reaching posteriorly to between a vertical line above urogenital papilla and base of first ray of anal fin; pelvic fin I 5, no frenum, basal membrane 9-18% length of fifth ray, first four rays with one sequential branch (once with two branch points in fourth ray), fifth ray branched once dichotomously and 56-65-74% ([bar.