Millerichthys Costa. Monotypic
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https://doi.org/ 10.1590/1982-0224-20180007 |
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https://doi.org/10.5281/zenodo.3716499 |
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https://treatment.plazi.org/id/03A77E10-FFBF-FF9B-FC8A-7869F83FFEEF |
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Carolina |
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Millerichthys Costa. Monotypic |
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Millerichthys Costa. Monotypic (( M. robustus (Miller & Hubbs)) small-sized (30 mm SL), annual genus, that is distributed in southern Mexico. The species is diagnosed by the following apomorphies: reduced mesopterygoid; conical and elongate ventral process of posttemporal; long posterior series of supraorbital neuromasts; absence of transverse dark bar crossing the eye; three transverse yellow stripes on the anal fin of males; and black spots along the caudal-fin base of females ( Costa, 1998). Its phylogenetic relationship with other Rivulidae remains unclear. Costa (1998), proposed three synapomorphies to support the sister relationship of Millerichthys Costa with Rachoviini: a dorsally pointed preopercle, reduced neural prezygapophyses of caudal vertebrae, and a reduced dark pigmentation in females. However, Costa (2004) hypothesized the genus as the sister taxon of Cynolebiasinae based on three different synapomorphies: mesopterygoid small, posterior tip not contacting metapterygoid; hypurals completely fused; frontal scales in transverse pattern without distinct central scale.
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