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Rosyface vs Tennessee Shiner
#1
Guest_itsme_*
Posted 31 May 2011 - 09:06 AM
Thanks!
#2
Guest_gerald_*
Posted 31 May 2011 - 09:42 AM
Leuciodus: 7-9 (usually 8 ) anal rays, dorsal origin directly above or barely posterior to pelvic origin, distinct gold stripe above dark lateral stripe.
A back-lit photo may work for counting anal rays. The Tennessee basin "rubellus" are now "micropteryx". The Ohio/New R are the true rubellus.... and dont forget to consider N.photogenis too.
Does anyone have a reliable way of separating Notropis rubellus from Notropis leuciodus without killing (or stressing) them? I am looking at specimens from Copper Creek, Virginia, Clinch/Tennessee River drainage.
Thanks!
Edited by gerald, 31 May 2011 - 09:42 AM.
#3
Guest_ashtonmj_*
Posted 31 May 2011 - 09:42 AM
#4
Guest_itsme_*
Posted 31 May 2011 - 10:21 AM
Rubellus: 9-11 (usually 10)anal rays, dorsal origin distinctly posterior to pelvic origin, faint or no gold stripe above dark lateral stripe.
Leuciodus: 7-9 (usually 8 ) anal rays, dorsal origin directly above or barely posterior to pelvic origin, distinct gold stripe above dark lateral stripe.
A back-lit photo may work for counting anal rays. The Tennessee basin "rubellus" are now "micropteryx". The Ohio/New R are the true rubellus.... and dont forget to consider N.photogenis too.
That sounds do-able. Thanks, Gerald! Still pretty subtle, though. The NANFA Forum: Where the experts hang out!
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I think I can pick out photogenis pretty well. So micropteryx is now a described species? Can you give me a citation to look up? Thanks!
#5
Guest_itsme_*
Posted 31 May 2011 - 10:24 AM
Do they have a dark caudal spot? Is the lateral line HEAVILY stitched? Where is the dorsal fin origin in relation to the pelciv fin origin?
Oh, yeah, I guess rubellus doesn't really have the caudal spot, huh? Stitching too, that's good. I was going to go on fin origins, but Freshwater Fishes of Virginia seemed to indicate that this was quite variable and maybe not reliable. Thanks, Matt! Experts indeed!
#6
Guest_tricolor_*
Posted 31 May 2011 - 03:45 PM
Edited by tricolor, 31 May 2011 - 03:45 PM.
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