| Family: |
Characidae (Characins; tetras), subfamily: Stevardiinae |
| Max. size: |
5.1 cm SL (male/unsexed) |
| Environment: |
benthopelagic; freshwater |
| Distribution: |
South America: Río Cachiyacu, a tributary of the Río Huallaga, Amazon basin in Peru. |
| Diagnosis: |
Dorsal soft rays (total): 10-10; Anal soft rays: 13-15; Vertebrae: 36-37. Creagrutus cerritulus can be easily distinguished from all congeners by the following unique characters: mouth distinctly ventrally positioned; dentary and premaxilla dentition strongly spatulate with the central and adjacent cusps of similar size; anterior portion of the dentary strongly bent forming a nearly 120° angle relative to the posterior portion of the lower jaw and resulting in the cutting edges of the dentary teeth running parallel to the distal axis of the jaw; symphyseal interdigitations present on the lingual surface between the contralateral premaxillae; a notch along the posterior margin of the maxilla present which serves for the insertion of the ligamentum primordiale; distal tips of the mesethmoid wings anteriorly bent; very tight association between the posterior, cuneiform process of the vomer and the anterior portion of the parasphenoid; intestine distinctly elongated; size of stomach reduced; and swimbladder reduced, especially the posterior chamber (Ref. 116020). |
| Biology: |
Inhabits river characterized by moderate to strong currents over a substrate composed primarily of pebbles and rocks. The water was reddish in color, alkaline, with high conductivity (10000 μS/cm) and 'very salty' water. Collected along with only six other fish species. |
| IUCN Red List Status: |
Not Evaluated (N.E.) Ref. (130435)
|
| Threat to humans: |
harmless |
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