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Deep-Water Crustacea of the Genus Sergestes (Decapoda, Natantia) from Cook Strait, New Zealand
Definition of Subgenera and Synopsis of Species
Definition of Subgenera and Synopsis of Species
Subgenus Sergestes S.S. M.-Edwards, 1830
- 1940. Sergestes s.s. Burkenroad, Ann. Mag. Nat. Hist. ser. 11, vi: 38.
- 1945. Sergestes s.s. Burkenroad, Trans. Conn. Acad. Arts Sci., 36: 587 footnote 11.
- 1955. Sergestes s.s. Dennell, Jour. Linn. Soc. London Zool. XLII: 399.
Species of Sergestes s.l. with specialised luminescent modifications of the gastrohepatic gland (organs of Pesta) but without dermal photophores. Supraorbital and hepatic spines may be present or absent in adult. Ovary confined to cephalothorax. Colour in life due to red subcuticular chromatophores mainly concentrated on the anterior part of the body.
The type species of the subgenus is the same as for the genus, S. atlanticus M.-Edw., 1830.
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
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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. | |
| 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. |
Subgenus Sergia Stimpson, 1860
- 1860. Sergia Stimpson, Proc. Acad. Nat. Sci. Philad. 1860: 46.
- 1940. Sergia Burkenroad, Ann. Mag. Nat. Hist. ser. 11, VI: 43.
- 1945. Sergia Burkenroad, Trans. Conn. Acad. Arts Sci. 36: 587 footnote 11.
- 1955. Sergia Dennell, Jour. Linn. Soc. London Zool. XLII: 399.
Species of Sergestes s.l. without specialised luminescent modifications of the gastrohepatic gland (organs of Pesta). With or without dermal photophores, which when present may or may not have cuticular lenses. Supraorbital and hepatic spines absent in adult (secondary hepatic prominences may sometimes be present). Ovary may extend into the abdomen. Adult with red cuticular pigment distributed over entire body and appendages in life.
The type species of the subgenus is Sergia remipes Stimpson, 1860. This is a late mastigopus stage which Burkenroad claims (1945) to have identified with this group of the genus Sergestes.
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Synopsis of the Subgenus Sergia
| 1 (4) Dermal photophores (lens-bearing or lens-less) present on body and appendages. | |
| 2 (3) Photophores of the lens-bearing type | The "S. challengeri" group. S. prehensilis Bate, 1881 (syn. S. gloriosus Stebbing); S. challengeri Hansen, 1903; S. fulgens Hansen, 1919; S. lucens Hansen, 1922; S. talismani Barnard, 1947 (nov. nom. for S. splendens Hansen); S. scintillans Burkenroad, 1940, and S. stellatus Burkenroad, 1940. |
| 3 (2) Photophores of the lens-less"opaque spot" type | The "S. robustus" group. S. robustus Smith. 1882; S. bisulcatus Wood-Mason, 1891; S. phorcus Faxon, 1893; S. gardineri Kemp, 1913; S. splendens Sund, 1920 (syn. S. richardi Hansen, S. crassus Hansen); S. grandis Sund, 1920; S. plumeus Illig, 1927; S. regalis Gordon, 1939; S. creber Burkenroad, 1940; S. extenuatus Burkenroad, 1940; S. maxim us Burkenroad, 1940; S. potens Burkenroad, 1940; S. bigemmeus Burkenroad, 1940; S. inequalis Burkenroad, 1940, and S. filictum Burkenroad. 1940. |
| 4 (1) No dermal photophores present on body or appendages. Integument membraneous | The "S. japonicus" group. S. tenuiremis Kröyer, 1855; S. japonicus Bate, 1881 (syn. S. mollis Smith); S. kröyeri Bate, 1881 (syn. S. tropicus Sund); S. profundus Bate, 1888; S. inous Faxon, 1893 and S. laminatus Burkenroad, 1940. |
| Incertae sedis | S. colosii Cecchini, 1933 (description not seen), and S. (Sergestes) sundi Dennell, 1955 (nomen nudum apparently an unpublished name supplied by Burkenroad, see p. 393). |