1 (6) 3rd maxillipeds subequal with 3rd pereiopods. |
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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
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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. |
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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. |
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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. |
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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. |