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Title: Deep-Water Crustacea of the Genus Sergestes (Decapoda, Natantia) from Cook Strait, New Zealand

Author: J. C. Yaldwyn

Publication details: Victoria University of Wellington, Wellington

Part of: Zoology Publications from Victoria University of Wellington

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Deep-Water Crustacea of the Genus Sergestes (Decapoda, Natantia) from Cook Strait, New Zealand

Synopsis of the Subgenus Sergestes s.s

Synopsis of the Subgenus Sergestes s.s.

1 (6) 3rd maxillipeds subequal with 3rd pereiopods.
2 (3) The two distal segments of the 5th pereiopods setose on both margins	The "S. corniculum" group. S. corniculum Kröyer, 1855; S. rubroguttatus Wood-Mason, 1891; S. seminudus Hansen, 1919; S. nipponensis Yokoya, 1933; S. erectus page 8
	Burkenroad, 1940; S. disjunctus Burkenroad, 1940; and S. coalitus Burkenroad, 1940.
3 (2) The two distal segments of the 5th pereiopods setose on only one margin.
4 (5) Third segment of antennular peduncle shorter than first. Petasma with processus uncifer terminally hooked	The "S. arcticus" group. S. arcticus Kröyer, 1855, and S. similis Hansen, 1903. (S. affinis Hansen, 1919 must be a lapsus calami for this species.)
5 (4) Third segment of antennular peduncle subequal or longer than first. Petasma with processus uncifer not terminally hooked	The "S. atlanticus" group. S. atlanticus M.-Edwards, 1830, and S. cornutus Kröyer, 1855.
6 (1) Third maxillipeds greatly enlarged, considerably longer than 3rd pereiopods.
7 (8) The two distal segments of the 5th pereiopods setose on both margins. Petasma with processus uncifer well developed and long pars media	The "S. sargassi" group. S. sargassi Ortmann, 1893; S. henseni (Ortmann, 1893); S. nudus Illig, 1914; S. pectinatus Sund, 1920; S. pestafer Burkenroad, 1937; S. verpus Burkenroad, 1940 and S. index Burkenroad, 1940.
8 (7) The two distal segments of the 5th pereiopods setose on only one margin. Petasma with rudimentary processus uncifer and short pars media.
9 (10) Dactyl of 3rd maxilliped with 4 sub-segments. Outer margin of uropodal exopodite not setose proximally	The "S. vigilax" group. S. armatus Kröyer, 1855; S. vigilax Stimpson, 1860; S. diapontius Bate, 1881; S. halia Faxon, 1893; S. incertus Hansen, 1896, and S. stimulator Burkenroad, 1940.
10 (9) Dactyl of 3rd maxilliped with 6 sub-segments. Outer margin of uropodal exopodite setose for entire length in adult	The "S. edwardsi" group. S. edwardsi Kröyer, 1855; S. orientalis Hansen, 1919; S. tantillis Burkenroad, 1940, and S. semissis Burkenroad, 1940.