| Family: |
Characidae (Characins; tetras), subfamily: Aphyoditeinae |
| Max. size: |
2.11 cm SL (male/unsexed) |
| Environment: |
benthopelagic; freshwater |
| Distribution: |
South America: Marajó Island, Brazil. |
| Diagnosis: |
Dorsal soft rays (total): 10-11; Vertebrae: 31-33. This species differs from all members of the genus Tyttobrycon by the possession of tricuspid premaxillary teeth, tri- or pentacuspid maxillary teeth and four broad tricuspid anterior dentary teeth (vs. all teeth conical in the jaws). It can be further diagnosed from all congeners, except T. dorsimaculatus, by having 5-7 premaxillary teeth (vs. 8-9), and from T. dorsimaculatus by having only scattered melanophores on the dorsal fin (vs. dorsal fin with a conspicuous black spot). The presence of adipose fin separates this species from T. hamatus and T. spinosus (vs. adipose fin absent) (Ref. 94718).
Description: Dorsal-fin rays ii,8-9; anal-fin rays iii-iv,12-14; pectoral-fin rays i,8-10; pelvic-fin rays i,7; 3 longitudinal scale rows below lateral line at pelvic-fin origin; 28- 31longitudinal scale row, including pored scales (Ref. 94718). |
| Biology: |
Collected from temporary streams, drying completely during the dry season (September to February) and flowing on the rainy season (March to August). Small groups of adults were found on the bottom and marginal portions of the streams in April. Juveniles in large schools were collected along the bottom of the stream in August (Ref. 94718). |
| IUCN Red List Status: |
Least Concern (LC); Date assessed: 07 November 2018 Ref. (130435)
|
| Threat to humans: |
harmless |
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