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Nototanoides trifurcatus gen. nov., sp. nov. is described and illustrated from the Gulf of Mexico. Nototanoides differs from the other genera of the family by the male possessing a vestigial maxilliped. It most closely resembles the genera Nototanais and Androtanais. In addition to the differences of the maxillipeds the males of Nototanoides can be separated by the 4-segmented antenna 1 and the females are distinguished by the trifurcate spine on the second segment of the palp of the maxilliped. A key to known genera of the family Nototanaidae is presented. Sieg and Heard (1983) reported the tanaidacean Teleotanais gerhchi Lang, 1956, from the west coast of Florida, constituting the first record of the family Nototanaidae Sieg, 1976, from the Gulf of Mexico. Recently, specimens of a second member of this family, representing a new genus and species, have been made available to us by David K. Camp and Eric N. Powell. These specimens were collected on hard bottoms in both the eastern and western Gulf of Mexico. Nototanoides gen. nov. Diagnosis With eyelobes; an tenna 1 of female 3-segmented, in male 4-segmented. Female mandible with strong pars molaris; endite of maxilla 1 with 9 terminal spines, palp with 2 setae distally; maxilliped without coxa, basis fused medially, endite also fused medially. Males with mandibles, maxilla 1, maxilla 2, and labium greatly reduced, unrecognizable; maxilliped vestigial with basis and endite fused medially; epignath present. Female marsupium formed by 4 pairs of oostegites. Sexual dimorphism of cheliped not well marked, but distinctly larger in male. Pereopods 4-6 with dactylus and terminal spine coalesced to claw. Five pairs of pleopods, endopod with distal setae on inner margin. Uropods biramous, endopodite 2-segmented. Type-species: Nototanoides trifurcatus sp. nov Gender: Masculine. Etymology The ending -0ides indicates that this genus is related to Norotanais Richardson, 1906. Remarks Nototanoides is placed in the family Nototanaidae because t h e basis of the maxilliped is fused medially, the dactyl and terminal spine of pereopods 4-6 are coalesced to form a claw, the uropodal endopod is only 2-segmented and the eyelobes are well developed. It is excluded from the Leptocheliidae Lang, 1973, because the Manuscript received May 6 , 1985; accepted September 24, 1985. members of that family are characterized by having an unfused maxilliped and the endopod of the uropod consisting of 3 or more articles (see Sieg 1984a). Nototanoides cannot be included in the Paratanaidae Lang, 1949, because the members of this family have the basis as well as the endite of the maxilliped typically enlarged and the male differs totally in body shape from the female. The general body structure, armament of pereopods, and general shape of antenna 1 indicate that Nototanoides is most closely related to the nototanaid genera Androtanais Sieg, 1973, and Nototanais. Androtanais, known only from the male, is characterized by having (1) antenna 1 with 5 articles, (2) only remnants of the maxilla present, and (3) a nearly normally developed maxilliped (only the endite reduced) with medially fused basis. The male “cheliped” of Androtanais indicates sexual dimorphism, unless the female is atypical for the family. This opinion is supported by the fact that the male “cheliped” of Androtanais is subchelate while in the known females of the other nototanaid genera it is chelate. In Nototanais the male also has an antenna 1 of 5 articles, but the third article is much shorter than in Androtanais. Nototanais is also characterized by having a relatively normal maxilliped with the endite unfused. Sexual dimorphism of the cheliped is quite apparent. In males development of the propodus, fixed finger, and sometimes the carpus is much more pronounced and enlarged than in females. Nototanoides differs from Androtanais and Nototanais by the male having an antenna 1 with 4 articles (third article very small), less sexual dimorphism of the chelipeds (the male cheliped is much larger and stronger than t h a t of the female but otherwise similar), and a strongly reduced male maxilliped (basis small and fused medially, palp lacking, endite fused). In the female of Nototanoides, the endite of maxilla 1 has only 9 terminal spines instead of 10 as in Nototanais. As in Androtanais, the endite of the maxilliped is almost totally fused in Nototanoides. By contrast, males of Nototanoides and Nototanais have greatly reduced mouthparts with only the reduced palp of maxilla 1 remaining.

gulf research reports

Tanaidacea (Crustacea: Peracardia) of the Gulf of Mexico. IV. On Nototanoides trifurcatus Gen. Nov., Sp. Nov., with a Key to the Genera of the Nototanaidae