Macrobrachium Spence Bate, 1868

Mantelatto, Fernando L., Pileggi, Leonardo G., Pantaleao, Joao A. F., Magalhaes, Celio, Villalobos, Jose Luis & Alvarez, Fernando, 2021, Multigene phylogeny and taxonomic revision of American shrimps of the genus Cryphiops Dana, 1852 (Decapoda, Palaemonidae) implies a proposal for reversal of precedence with Macrobrachium Spence Bate, 1868, ZooKeys 1047, pp. 155-198 : 155

Genus Macrobrachium Spence Bate, 1868

Cryphiops Dana, 1852: 18 [type species: Cryphiops spinulosomanus Dana, 1852] [based on Art. 23.9.3, ICZN 1999]. - Holthuis 1952a: 136. - Holthuis 1955: 51. - Maccagno and Cucchiari 1957: 206 (in list), 213. - Holthuis 1993: 105. - Jayachandran 2001: 14 (in key), 24. - Álvarez et al. 2011: 257.

Bithynis Philippi, 1860: 164 [type species: Bithynis longimana Philippi, 1860 (= Cryphiops caementarius (Molina, 1782))].

Macrobrachium Spence Bate, 1868: 363 [type species: Macrobrachium americanum Spence Bate, 1868]. - Holthuis 1952a: 10. - Holthuis 1955: 53. - Maccagno and Cucchiari 1957: 206 (in list), 214. - Hobbs Jr. et al. 1977: 50. - Rodríguez 1980: 113. - Holthuis 1993: 109. - Chace Jr, Bruce 1993: 8. - Jayachandran 2001: 14 (in key), 49. - Valencia and Campos 2007: 3. - Álvarez et al. 2011: 260. - Dueñas et al. 2012: 69. - Campos 2014: 56.

Eupalaemon Ortmann, 1891: 696, 697 [type species: Palaemon acanthurus Wiegmann, 1836].

Parapalaemon Ortmann, 1891: 696, 731 [type species: Palaemon dolichodactylus Hilgendorf, 1879].

Macroterocheir Stebbing, 1908: 39 [type species: Palaemon lepidactylus Hilgendorf, 1879].

Bithynops Holthuis, 1973: 135 [type species: Bithynops luscus Holthuis, 1973]. - Holthuis 1993: 102. - Hobbs Jr. et al. 1977: 46. - Jayachandran 2001: 14.

Cryphiops (Cryphiops) . - Villalobos Hiriart et al. 1989: 161.

Cryphiops (Bithynops) . - Villalobos Hiriart et al. 1989: 163. - Álvarez et al. 2011: 258.

Type species.

Macrobrachium americanum Spence Bate, 1868, subsequent designation by Fowler (1912).

Diagnosis

(modified from Holthuis 1950, 1952a). Body compressed, generally robust, sometimes slender. Rostrum well developed, compressed, toothed, size varying from shorter to longer than distal margin of scaphocerite. Carapace with anterolateral portion smooth or bearing numerous small spinules. Carapace armed with antennal spine; hepatic spines present in most species, branchiostegal groove present, distinct. Mandible with 3-segmented palp. All maxillipeds with well-developed exopods. Pleurobranchs on third maxilliped and all pereiopods. P1 slender. P2 more robust than other pereiopods, usually longer than entire body in adult males, left and right legs often equal in size and shape or markedly different in several species. P3-P5 with dactylus simple. P5 with propodus bearing numerous transverse rows of setae in distal part of posterior margin. PL1 with endopod much smaller than exopod, endopod of male without appendix interna. Pleon with pleurae smooth in most species or with small spinules. Uropods overreaching telson; exopod with distolateral spine, endopod unarmed. Telson elongate, subtriangular, narrowing posteriorly, with two pairs of dorsal spines, anterior pair placed in middle, posterior pair usually placed midway between anterior pair and posterior margin; posterior margin ending in sharp median point, flanked by two pairs of spines, outer pair usually shorter than inner one, inner pair overreaching apex of telson in most species. See detailed description in Holthuis (1950).

Remarks.

See Discussion.