Duckbill flagfin (Leptaulopus erythrozonatus), first described by Gomon, Struthers & Stewart, 2013 is a medium-sized fish. Adults typically reach 27.40 cm in maximum length. It inhabits marine coastal and open-ocean environments. Recorded depth range: 130 to 280 metres. It occurs in Subtropical waters. Diet is predominantly piscivorous, targeting other fish and larger prey. On the IUCN Red List, it is classified as Data Deficient.
Dorsal soft rays (total): 15 - 16; Anal soft rays: 10 - 11; Vertebrae: 44. This species is distinguished by the following characters: D 15-16; A 10-11; vertebrae 26 or 27 + 17 or 18 = 44; lateral line scales 44 + 1, below lateral line 4.5; predorsal scales 20; gill rakers 3 + 12; elongated snout, length 11.5-12.4% SL and 34.6-36.5% HL, which is much longer than eye diameter, dorsoventrally flattened, narrowly rounded from above; narrow bony interorbital, width 3.0-3.5% SL and 8.9-10.3% HL; snout tip to dorsal fin origin 42.5-43.7% SL in distance and 128-129% HL; anal n base 92-9.8% SL and 27.0-29.1% HL; colour of posterior end of maxilla and posterior and ventral margins of preopercle stark white; translucent dorsal fin with 4-6 narrow submarginal stripes from base to outer edge of fin, stripes posteriorly angled obliquely, intervening spaces of fin rays white; caudal fin white with 4-5 red bands crossing each lobe and proximal bands continuous across fin in some .: elongated; Cross section: oval.
Behavioural data for Duckbill flagfin is currently being reviewed.
Marine; demersal; depth range 130 - 280 m . Subtropical South Wales (NE coast of North I.
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