Acknowledgements Work was supported in part by an award
from the Gulf and South Atlantic Fisheries Development Foundation
(Project 70-04-20000/11824), the National Marine Fisheries
Service (Marfin Project 87-FF-0426), and the Texas
Agricultural Experiment Station Project H-6703). Views expressed
in the paper are those of the authors and do not necessarily
reflect views of the sponsors. This paper is no. 40 in the series
‘Genetic Studies in Marine Fishes’ and contribution no. 130 of
the Center for Biosystematics and Biodiversity at Texas A&M
University.