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Family Penaeidae 85
3. (2) Rostrum usually not upturned at tip and not extremely attenuate; chromatophores
slate-blue and brown; usually with conspicuously pigmented lateral spot at juncture
of third and fourth abdominal somites; uropods with uniform sprinkling of
chromatophores, degree of transparency uniform throughout (color more dense in
older individuals) P. duorarum
Rostrum usually slightly upturned and attenuate at tip; chromatophores brown and
olive-green; usually lacking lateral spot at juncture of third and fourth abdominal
somites; uropods with reddish-brown to brown areas distally P. aztecus
Genus Trachypenaeus Alcock, 1901
Key to species
[Adapted from Chace, 1972]
Thelycum pubescent, lips of transverse groove strongly biconvex; male with sternal
elevation between coxae of fifth pereopods goblet-shaped, constricted posteriorly ...
T. constrictus
Thelycum naked, lips of transverse groove subhorizontal; male with sternal
elevation between coxae of fifth pereopods triangular, sloping regularly to posterior
apex T. similis