Penaeus duorarum duorarum Burkenroad — Continued 



Reproduction — Continued P^se 



Ovary development 513 



Spawning 514 



Sex ratio 514 



Postembryonic development 514 



Larvae, postlarvae, and juveniles 514 



Growth 515 



Sex differences in size 516 



Ecology 516 



Food 516 



Substrate 516 



Diel cycle 516 



Movements 517 



Effects of temperature 519 



Effects of salinity 519 



Enemies and diseases 520 



Commercial importance 520 



Penaeus duorarum notialis P^rez Farfante 520 



Taxonomic remarks 521 



Study material 521 



Mexico 521 



Quintana Roo 521 



Colombia 521 



Diagnosis 521 



Description 521 



Rostrum 521 



Carapace 521 



Antennules 522 



Antennae 522 



Thoracic appendages 522 



Abdomen 522 



Petasma 523 



Appendix masculina 523 



ThelycLim 523 



Color -- 523 



Distribution and morphological variations 523 



Relationships 526 



Reproduction 526 



Subadult stage-sexual maturity 526 



Copulation 526 



Ovary development 526 



Spawning 526 



Sex ratio 526 



Postembryonic development 526 



Larvae, postlarvae, and juveniles 5-6 



Growth 526 



Sex differences in size 52 < 



Ecology 527 



Substrate 5-; 



Diel cycle 527 



Movements "^■"' 



Effects of tem]jerature 5-7 



Enemies and diseases ''--' 



Commercial importance ■^■"' 



Penaeus aziecus aztecus Ives ■^-' 



Taxonomic remarks 5-9 



Study material 5-J 



United States 529 



Massachusetts 5-J 



New York 529 



New Jersey 5-9 



