Nannoxyropsis, Delapieve & A. & Reis, 2017

Delapieve, Maria Laura S., A., Pablo Lehmann & Reis, Roberto E., 2017, An appraisal of the phylogenetic relationships of Hypoptopomatini cascudinhos with description of two new genera and three new species (Siluriformes: Loricariidae), Neotropical Ichthyology 15 (4), No. e 170079, pp. 1-38 : 30

Nannoxyropsis , new genus

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Type-species. Nannoxyropsis acicula .

Included species. Nannoxyropsis ephippia (Aquino, Sabaj, 2016) [New Combination]; and Nannoxyropsis acicula , new species.

Diagnosis. Nannoxyropsis is diagnosed as monophyletic based on three exclusive synapomorphies: posterior ventral corner of canal cheek plate towards ventral midline (char. 69.1); row of odontodes aligned along trunk midline, adjacent and immediately ventral to lateral line canal (char. 98.1); and one enlarged odontode at posterior margin of median lateral plates of caudal peduncle (char. 99.1).

Comparisons. The species of Nannoxyropsis are distinguished from other hypoptopomatins by having two rows of aligned odontodes along the trunk midline, that lie adjacent and immediately dorsal and ventral to the lateral line canal (vs. one row in Oxyropsis or no aligned odontodes); by the posterovental corner of the canal cheek plate that projects towards the ventral midline (vs. canal cheek plate not projected medially); and by the presence of one distinctly enlarged odontode at the posterior margin of the median lateral plates of the caudal peduncle (vs. enlarged odontode absent). The species of Nannoxyropsis can be additionally differentiated from Oxyropsis by having a round to compressed caudal peduncle in cross section (vs. depressed caudal peduncle in cross-section); and by the last seven plates of the mid-ventral series having the same size as the adjacent plates in the median series (vs. the last mid-ventral plates having at most half the size of the adjacent median series plates).

Etymology. Nannoxyropsis is from the Greek nannos, meaning small, and Oxyropsis , a genus of Hypoptopomatini , in reference to the small size of the species included.

Gender. Feminine.