Helcogramma lacuna Williams & Howe, 2003
Cavern triplefin
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Family:  Tripterygiidae (Triplefin blennies), subfamily: Tripterygiinae
Max. size:  4.4 cm TL (male/unsexed)
Environment:  benthopelagic; marine; depth range 1 - 7 m
Distribution:  Eastern Indian Ocean: Thailand, in the Andaman Sea. This is the only species of the fuscospinna species complex occurring in the Eastern Indian Ocean (Ref. 52308).
Diagnosis:  Dorsal spines (total): 16-17; Dorsal soft rays (total): 10-11; Anal spines: 1-1; Anal soft rays: 20-20; Vertebrae: 37-37. Description: Dorsal rays III +XIII- XIV + 10-11, 1-2 free pterygiophores; anal fin I, 20; pectoral rays 16-17 (usually 1+9+7); pelvic fin I,2; caudal rays 13, branched 9, procurrent 9 each in both dorsal and ventral. Vertebrae 11+ 26; last pleural and epipleural ribs on 11th vertebral centrum. Lateral line continuous, pored scales 21-27 (usually 25); scales ctenoid; largest (twice in size) at the area posterior to pectoral-fin base and below the lateral line; head, nape, belly, and pectoral-fin base scaleless. Mandibular sensory pores 5-12 + 5-10 + 5-12 (usually 9+5+8); orbital cirri minute (Ref. 52308, 90102). Male overall dusky, head darker ventrally, body with 7-8 bars, irregular and faint; female tan to dusky brown with bars more faint (Ref. 90102).
Biology:  Adults inhabit sand channels in patch reefs (Ref. 90102). Eggs are hemispherical and covered with numerous sticky threads that anchor them in the algae on the nesting sites (Ref. 240). Larvae are planktonic which occur primarily in shallow, nearshore waters (Ref. 94114).
IUCN Red List Status: Least Concern (LC); Date assessed: 06 May 2010 Ref. (124695)
Threat to humans:  harmless
Country info:   

Entered by: Busson, Frédéric - 04.11.04
Modified by: Reyes, Rodolfo B. - 06.10.21

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