synspilum - melanurus

synspilus is a Junior Synonym of Paraneetroplus melanurus

Abstract
The genus Paraneetroplus (Teleostei: Cichlidae) currently consists of 11 species that naturally occur from southern Mexico
south to Panama. Paraneetroplus melanurus (Günther 1862) is found in the Lago de Petén system of Guatemala, and
P. synspilus (Hubbs 1935) in the Río Grijalva-Usumacinta system, and other systems in Mexico, Belize, and Guatemala.
Reported morphological differences between the two nominal species in the literature are vague but center around characteristics
of a dark band that begins at the caudal fin and tapers anteriorly near mid-body. This band is reported as straight
(horizontal) in P. melanurus but ventrally sloped in P. synspilus. Some authors have previously suggested that these two
forms are not distinct. The purpose of this study was to conduct a systematic morphological comparison of P. melanurus
and P. synspilus to further investigate their validity. We examined meristic, morphometric, and geometric morphometric
characters and failed to recover diagnostic differences between these two forms. The characters proposed to separate them
do not allow for their differentiation, and we conclude that P. synspilus is a junior synonym of P. melanurus. A re-description
of P. melanurus is provided on the basis of existing type material and additional material recently collected.

http://www.mapress.com/zootaxa/2011/f/z02833p014f.pdf

Thanks for your contridution on the forum, but not everybody read english .... And what is the purpose of this post.

Thank for this information but it's only a morphometric study...
In the last phylogenetic studies, the 2 species are very near like Thorichthys affinis and Thorichthys meeki. So why not ?
But something very hard to understand : Paraneetroplus !
If melanurus is a Paraneetroplus, I think we can call all mexican cichlid Paraneetroplus.