Calastacus Faxon, 1893

Poore, Gary C. B. & Collins, David J., 2009, Australian Axiidae (Crustacea: Decapoda: Axiidea), Memoirs of Museum Victoria 66 (2), pp. 221-287 : 247-248

publication ID	https://doi.org/10.24199/j.mmv.2009.66.20
persistent identifier	https://treatment.plazi.org/id/E74287C8-3D71-8D2D-665F-F990FEF0FAF1
treatment provided by	Felipe (2024-06-21 16:54:11, last updated 2024-06-21 17:27:36)
scientific name	Calastacus Faxon, 1893
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Calastacus Faxon, 1893 View in CoL

Calastacus Faxon, 1893: 194 View in CoL . — Schmitt, 1921: 112. — de Saint Laurent, 1972: 353. — Sakai and de Saint Laurent, 1989: 59. — Kensley, 1989: 961. —Kensley, 1996: 158, 159.

Calocaris (Calastacus) . — Alcock, 1901: 191. — Borradaile, 1903: 539. — De Man, 1925b: 115.

Type species. Calaxius stilirostris Faxon, 1893 , by monotypy.

Diagnosis. Carapace smooth; cervical groove visible laterally over most of distance to anterolateral margin. Rostrum spine-like, laterally weakly dentate, longer than eyestalks, depressed below level of carapace, continuous with lateral carinae; supraocular spines prominent; lateral carina weak; submedian carina absent; median carina smooth; postcervical carina absent. Abdominal somite 1 pleuron triangular; pleuron 2 posteriorly rectangular; pleura 3–5 posteriorly rounded.Eyestalk cylindrical, articulating; cornea unpigmented. Antenna, scaphocerite short. Maxilliped 3 exopod not clearly bent at base of flagellum. Pleurobranchs absent above pereopods 2–4; podobranchs rudimentary on maxilliped 3–pereopod 3, arthrobranchs present; epipods present on maxilliped 2 to pereopod 4. Pereopods 1 asymmetrical, with propodus cylindrical; propodus with spine on upper margin. Pereopods 3–5 propodi with transverse rows of robust setae; dactyli 3 and 4 elongate; dactylus 5 elongate. Pleopods 3–5, appendix interna present. Hermaphroditic. Pleopod 1 article 1 flattened; article 2 subtriangular, two-thirds length of first, folded longitudinally, posterior part distally lobed, anterior part larger, broader, with short appendix interna. Pleopod 2 endopod article 2 elongate, twice length of article 1, mesial margin straight, with basal digitiform appendix interna, appendix masculina divided into 2 equal parts bearing rows of strong setae. Uropodal exopod with transverse suture. Telson without lateral teeth, without posterolateral robust setae; apex deeply rounded and continuous with lateral margins.

Remarks. Calastacus is a genus of six species, C. stilirostris Faxon, 1893 from the central eastern Pacific, C. laevis de Saint Laurent, 1972 from the eastern Atlantic and Mediterranean, C. colpos Kensley, 1996 and C. mexicanus Kensley, 1996 from the Gulf of Mexico ( Kensley, 1996e), C. crosnieri Kensley and Chan, 1998 and C. inflatus Komai, Lin and Chan, 2009 from the north-western Pacific. The genus was diagnosed by de Saint Laurent (1972) whose concept has been followed by later authors. The genus differs from Ambiaxius only in the characteristic pleopods 1 and 2. Pleopod 1 is more elongate than in Ambiaxius and pleopod 2 has a long second segment on the endopod. A seventh species, first from the Indian Ocean, is described below.

References

Alcock, A. 1901. A descriptive catalogue of the Indian deep-sea Crustacea Decapoda Macrura and Anomala, in the Indian Museum. Being a revised account of the deep-sea species collected by the Royal Indian Marine Survey Ship Investigator. Trustees of the Indian Museum: Calcutta. 286 pp.

Borradaile, L. A. 1903. On the classification of the Thalassinidea. Annals and Magazine of Natural History (ser. 7) 12: 534 - 551 + Addendum on p. 638.

De Man, J. G. 1925 b. The Decapoda of the Siboga-Expedition. Part VI. The Axiidae collected by the Siboga-Expedition. Siboga Expeditie Monographie 39 a 5: 1 - 127.

de Saint Laurent, M. 1972. Un Thalassinide nouveau du golfe de Gascogne, Calastacus laevis sp. nov. Remarques sur le genre Calastacus Faxon (Crustacea Decapoda Axiidae). Bulletin du Museum National d'Histoire Naturelle, Paris (2 e serie) 35: 347 - 356.

Faxon, W. 1893. Reports on the dredging operations off the West Coast of Central America to the Galapagos, to the West Coast of Mexico, and in the Gulf of California, in charge of Alexander Agassiz, carried on by the U. S. Fish Commision Steamer Albatross , during 1891, Lieut. - Commander Z. L. Tanner, U. S. N., Commanding. Bulletin of the Museum of Comparative Zoology 24: 149 - 220.

Kensley, B. 1989. New genera in the thalassinidean families Calocarididae and Axiidae (Crustacea: Decapoda). Proceedings of the Biological Society of Washington 102: 960 - 967.

Kensley, B. 1996 e. New species of Calocarididae from the Caribbean Sea and Gulf of Mexico (Crustacea: Decapoda: Thalassinidea). Bulletin of Marine Science 59: 158 - 168.

Kensley, B., and Chan, T. - Y. 1998. Three new species of thalassinidean shrimps (Crustacea, Axiidae and Calocarididae) from Taiwan. Zoosystema 20: 255 - 264.

Komai, T., Lin, F. - J. and Chan, T. Y. 2009. A new mud shrimp species of Calastacus (Crustacea: Decapoda: Thalassinidea) from the South China Sea. Zootaxa 2088: 24 - 30.

Sakai, K., and de Saint Laurent, M. 1989. A check list of Axiidae (Decapoda, Crustacea, Thalassinidea, Anomula), with remarks and in addition descriptions of one new subfamily, eleven new genera and two new species. Naturalists, Publications of Tokushima Biological Laboratory, Shikoku University 3: 1 - 104.

Schmitt, W. L. 1921. The marine decapod Crustacea of California with special reference to the decapod Crustacea collected by the United Staes Bureau of Fisheries steamer ' Albatross' in connection with the biological survey of San Francisco Bay during the years 1912 - 1913. University of California Publications in Zoology 23: 1 - 470.

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Taxonomy

Kingdom	Animalia
Phylum	Arthropoda
Class	Malacostraca
Order	Decapoda
Family	Axiidae