Nemateleotris helfrichi Randall & Allen, 1973
Helfrichs' dartfish
Nemateleotris helfrichi
photo by Randall, J.E.

Family:  Microdesmidae (Wormfishes), subfamily: Ptereleotrinae
Max. size:  6 cm TL (male/unsexed)
Environment:  reef-associated; depth range 25 - 90 m
Distribution:  Pacific Ocean: eastwards to the Tuamoto Islands, north to the Ryukyu Islands.
Diagnosis:  Dorsal spines (total): 7-7; Dorsal soft rays (total): 29-31; Anal spines: 1-1; Anal soft rays: 26-28. Description: Characterized by lavender body; yellowish anterior head; top of head with violet stripe; median fins yellowish; anal fin with blue submarginal band; tips of pelvic fins, black; longitudinal scale series 140-160; elevated first dorsal fin, not extending beyond anterior one-third of second dorsal fin; posterior body scales with ctenii, usually less than 10; posterior most rays of dorsal and anal fins usually unbranched; depth of body 4.9-5.6 in SL (Ref. 90102).
Biology:  Occurs in relatively deep water. Found over small patches of sand, rubble, or hard open bottoms of steep seaward reefs. Rarely found in less than 40 m and frequently occurs in pairs. Monogamous (Ref. 52884). Feeds on zooplanktons (Ref. 89972).
IUCN Red List Status: Least Concern (LC); Date assessed: 12 March 2015 Ref. (120744)
Threat to humans:  harmless
Country info:   

Entered by: Torres, Armi G. - 27.01.95
Modified by: Valdestamon, Roxanne Rei - 20.10.14

Source and more info: For personal, classroom, and other internal use only. Not for publication.

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