A Morphological and Allozymic Analysis of Species in the Gobionellus Oceanicus Complex (Pisces: Gobiidae)
Morphological and allozymic investigations were conducted on the three nominal species Gobionellus gracillimus, G. hastatus and G. oceanicus, termed here the Gobionellus oceanicus complex. Gulf of Mexico samples of the complex differed in lateral scale row number from Caribbean and South Atlantic samples, while samples from the eastern coast of the United States included both forms and many specimens with intermediate values as well. No fixed differences were found between the two morphotypes at 21 presumptive gene loci. Allelic frequencies for specimens of the two forms from a syntopic collection suggested limited genetic divergence between northern and southern populations with south to north introgression. Gobionellus gracillimus was not distinguishable using the diagnostic characters offered in its original description. A single species, Gobionellus oceanicus, is recognized, of which G. gracillimus and G. hastatus are junior synonyms.
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Document Type: Research Article
Publication date: 01 November 1989
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