polgar at ALFANET.IT
Sun Jul 28 04:58:27 CDT 2002
I'm making some misurations on some gobiid (Perciformes: Gobiidae)
specimens and I need some help about general ichthyological anatomy:
How should I count caudal fin procurrent rays (dorsal and ventral)?
I've found out that in some specimens a kind of "papilla" is visible
immeadiatly posterior to the anus. In a specimen of about 15 cm it's almost
triangular in shape and at 2.3 mm before attachment of anal fin. At M.O. it
seems to be longitudinally sulcated and has got three smaller protuberances
in an immediately anterior position: do you know what is it and what's its
meaning? Does it relate with sexual dimorphism?
Please excuse my ignorance in fish anatomy, but It's not exactly my field.
Thank you for any kind of help.
c/o prof L. Bullini
Università degli studi di Roma "La Sapienza"
Department of Genetics and Molecular Biology, "Charles Darwin"
Via dei Sardi, 70
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