Gollum

Last, Peter R. & Gaudiano, Joe P., 2011, Gollum suluensis sp. nov. (Carcharhiniformes: Pseudotriakidae), a new gollumshark from the southern Philippines, Zootaxa 3002, pp. 17-30 : 29

Key to species of the genus Gollum

1 Snout elongate, preoral length shorter or subequal to mouth width, direct preorbital snout length less than 1.5 times interorbital space; head length less than 10 times nostril width; eye about 1.4–1.5 times nostril length; ventral head uniformly dusky, not strongly contrasted with similar dorsal coloration along its lateral margin; ventral lobe of caudal fin dusky, not strongly contrasted with rest of fin; no dark submarginal bar on caudal fin; monospondylous centra 44–45, total centra 151–154.......................................................................... G. suluensis sp. nov. (Sulu Sea, Philippines) Snout very elongate, preoral length slightly exceeding mouth width, direct preorbital snout length more than 1.5 times interorbital space; head length about 10 times nostril width; eye about 1.8–1.9 times nostril length; ventral head pale, strongly contrasted with darker dorsal coloration along its lateral margin; ventral lobe of caudal fin white in fresh material, strongly contrasted with rest of fin; dark submarginal bar on caudal fin; monospondylous centra 50–53, total centra 162–168.......................................................................... G. attenuatus (Garrick) (south-west Pacific)