Grallenia dimorpha Allen & Erdmann, 2017
photo by Allen, G.R. & M.V. Erdmann

Family:  Gobiidae (Gobies), subfamily: Gobiinae
Max. size:  1.45 cm SL (male/unsexed); 1.64 cm SL (female)
Environment:  reef-associated; marine; depth range 8 - 18 m
Distribution:  Western Pacific: Papua New Guinea.
Diagnosis:  Dorsal spines (total): 7-7; Dorsal soft rays (total): 8-11; Anal spines: 1-1; Anal soft rays: 9-11; Vertebrae: 27-27. This species is distinguished by the following characters: D VI + I,8-11 (usually 10); A I,9-11 (usually10); fully erect first dorsal fin of male differs from female, male fin rectangular with fifth spine longest and female fin triangular with first spine forming elongate filament; no pelvic frenum nor head pores; longitudinal scales 25-30, often continuous from posterior pectoral-fin base to caudal-fin base, but anterior half of body mainly scaleless; body depth at pelvic-fin origin 13.4-15.6% SL; colour of male in life translucent with a mid-lateral row of five widely separated and progressively shorter posteriorly, horizontal, orange-brown lines, each surrounded by yellowish hue and with a faint, narrow, vertical, brown line extending ventrally, forming overall T-shaped marking; dorsal fins with a pair of prominent stripes, the outermost relatively broad and yellow-orange, inner stripe situated just above fin base, narrower and orange-red with black margin; anal fin yellowish with distinctive black margin; caudal fin is yellowish with irregular translucent areas mainly on upper part of basal half; female similar, but fins translucent without both the distinctive stripes on dorsal fins and black margin on anal fin; series of five ovate, progressively smaller, brown blotches along lower side interspersed with brilliant white markings, beginning at pectoral-fin base, continuing to posterior caudal peduncle (Ref. 116128).
Biology:  Lives on sandy substrate (Ref. 116128).
IUCN Red List Status: Not Evaluated (N.E.) Ref. (130435)
Threat to humans:  harmless
Country info:   
 


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