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A new species of ariid catfish, Notarius biffi n. sp., from the eastern Pacific, is described. The spe- cies is distinguished from other eastern Pacific species of Notarius by the following features: mouth small (width 34.2-39.3% head length); eye large (diameter 3.8-4.5% standard length); mandibulary barbels short (length 10.2-13.1% standard length); distance between anterior nostrils short (17.9- 20.8% head length); caudal peduncle relatively slender (depth 6.1-6.7% SL); gill rakers on the first arch 11-12. N. insculptus (Jordan and Gilbert, 1883) new combination is redescribed herein. This species is distinguished from other eastern Pacific Notarius as follows: highly developed, sculp- tured epioccipital bones, forming with the supraoccipital a basally wide complex process which tapers drastically posteriorly; supraoccipital process length 0.7-0.9 in the base of the complex pro- cess; predorsal plate narrow and crescent-shaped; mouth large (width 45.8-54.8% head length); maxillary barbels long (length 26.7-30.3% standard length). Based on mitochondrial phylogenetic evidence (combined cytochrome b and ATP synthase 8/6 data set with 1937 base pairs) and general morphology, the amphiamerican genus Notarius is expanded to include a total of 14 species, eight of which are presented as new combinations ( N. cookei, N. insculptus, N. kessleri, N. luniscutis, N. neogranatensis, N. phrygiatus, N. quadriscutis, and N. rugispinis). The nomenclatural status of the eastern Pacific ariids Hexanematichthys henni, Arius hassleriana, A. festae, A. labiatus, A. plan- iceps, and A. osculus is discussed. Finally, a key to identify seven described species of Notarius from the eastern Pacific is presented.

zootaxa

Description of Notarius biffi n. sp. and redescription of N. insculptus (Jordan and Gilbert) (Siluriformes: Ariidae) from the eastern Pacific, with evidence of monophyly and limits of Notarius