Penaeus schmitti Burkenroad — Continued 



Description — Continued Page 



Thelycum 493 



Color 493 



Distribution and morphological variations 493 



Relationships 495 



Reproduction -- 495 



Subadult stage-sexual maturity 495 



Copulation - 495 



Ovary development 496 



Spawning 496 



Sex ratio 496 



Postembryonic development 496 



Larvae, postlarvae, and juveniles 496 



Growth 497 



Sex differences in size 497 



Ecology 497 



Food 497 



Substrate 497 



Diel cycle 497 



Movements 497 



Effects of temperature 498 



Effects of salinity 498 



Enemies and diseases 498 



Commercial importance 498 



Penaeus duorarum duorarum Burkenroad 499 



Taxonomic remarks 500 



Study material 501 



United States 501 



Maryland 501 



Virginia 501 



North Carolina 501 



Georgia 501 



Florida 501 



Alabama 502 



Mississippi 502 



Louisiana 502 



Texas 502 



Mexico 502 



Tamaulipas 502 



Veracruz 502 



Campeche 502 



Yucatdn 502 



Quintana Roo 502 



Bermuda Islands 502 



Diagnosis 502 



Description 503 



Rostrum 503 



Carapace 504 



Antennules 504 



Antennae 504 



Thoracic appendages 504 



Abdomen 505 



Petasma 505 



Appendix masculina 506 



Thelycum 506 



Color 506 



Distribution and morphological variations 508 



Relationships 508 



Reproduction 512 



Subadult stage-sexual maturity 512 



Copulation 513 



