Etmopterus

Jayna A. Schaaf-da Silva & David A. Ebert, 2006, Etmopterus burgessi sp. nov., a new species of lanternshark (Squaliformes: Etmopteridae) from Taiwan., Zootaxa 1373, pp. 53-64 : 62-63

[[ Etmopterus ]]

Key to the Etmopterus species of Western North Pacific

1a. Dermal denticles not arranged in longitudinal rows ..................................................... 2

1b. Dermal denticles arranged in longitudinal rows ........................................................... 3

2a. Upper teeth with 4-5 cusplets, gill openings very short .................... E. decacuspidatus

2b. Upper teeth usually 2 cusplets, gill openings fairly large ............................. E. unicolor

3a. Pelvic-fin flank marking without a posterior branch ................................. E. splendidus

3b. Pelvic-fin flank marking with a posterior branch 4 ..................................................... 11

4a. Second dorsal fin surface lacking dermal denticles. Central caudal marking <5% TL .. ......................................................................................................................... E. molleri

4b. Second dorsal fin surface with dermal denticles present. Central caudal marking usually>5% TL .................................................................................................................. 5

5a. Caudal peduncle relatively long, 13.7-15.5% TL. Branches of flank marking very long; posterior branch extending well past the second dorsal fin ............ E. brachyurus

5b. Caudal peduncle relatively short, 11.1-12.8% TL. Branches of flank marking short; posterior branch not extending past second dorsal fin .................................................. 6

6a. Gill openings moderately long, snout narrow. Ventral surface of snout lacking dermal denticles. Color in life brown above, black below........................................... E. lucifer

6b. Gill openings very long, snout broad. Ventral surface of snout covered with thick dermal denticles. Color in life dark gray above, black below............................ E. burgessi