Spinipterus Acsi (Spinipterus acsi), first described by Akama & Ferraris, 2011 is a tiny fish. Adults typically reach 3.20 cm in maximum length. It inhabits freshwater systems including rivers, streams, and lakes. It occurs in Tropical waters. It is broadly omnivorous, taking invertebrates, plant matter, and detritus. On the IUCN Red List, it is classified as Data Deficient.
Dorsal spines (total): 2; Dorsal soft rays (total): 5. The genus being monotypic, its species diagnosis is that of the genus. A genus of the auchenipterid subfamily Auchenipterinae that is distinguished from all other auchenipterid genera by the following combination of derived features: pectoral- and dorsal-fin spines with four rows of serrations running from base to the tip of the spines; (2) lateral margins of skull roofing bones ornamented with a single row of spines; (3) groove along dorsal midline posterior to dorsal fin, in which the adducted dorsal fin rests. Also the new genus has a unique combination of fin-ray meristics that are summarized as follows: D- II,4-5; P- I,5-6; V- i,5 (i,4 on opposite side); A- iv,16; C- i,7,9,i .: elongated.
Behavioural data for Spinipterus Acsi is currently being reviewed.
Freshwater; benthopelagic. Tropical South America: Peru (known only from the type locality).
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