W. H. Suijker & G. E. Collier
Новый вид икромечущих карпозубых из семейства Rivulidae из Гвианы.
Rivulus mahdiaensis, a new killifish from central Guyana (Cyprinodontiformes: Rivulidae)Abstract
Rivulus mahdiaensis, new species, was found in a small creek, a tributary of the Potaro River, near Mahdia, central Guyana. Males differ from all other species of the genus Rivulus by possessing elongate anal and dorsal fins, and an extremely large and lyre-shaped caudal fin with long extensions. Females differ from other species of the genus, except for three closely related species, by the presence of a narrow, dark longitudinal band on the sides. R. mahdiaensis possesses a unique karyotype (2n=38 ) among members of this group. Comparison of mitochondrial DNA sequences place this species as a member of a monophyletic clade which includes other small species from the Guyana shield and adjacent areas of northeastern South America.
W. H. Suijker & G. E. Collier
Zootaxa 1246: 1–13 (2006)