Calabazas shiner (Aztecula calabazas), first described by Silva, 2004 is a tiny fish. Adults typically reach 2.70 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 Critically Endangered.
Dorsal spines (total): 0; Dorsal soft rays (total): 8 - 9; Anal soft rays: 7 - 9. Having eight (occasionally seven or nine) anal rays; 36-40 lateral line scales, of which 22-37 are pored; 25-28 circumferential scales round the body and 15-17 circumferential scales around the caudal peduncle; 11-13 total gill rakers on the first gill arch and 17-19 on the second; 9-14 infraorbital pores (usually 9-11) in an interrupted canal that extends onto the snout; and 5-8 supraorbital pores (usually 5-6) in either a continuous or interrupted canal .
Behavioural data for Calabazas shiner is currently being reviewed.
Freshwater; benthopelagic. Tropical South America: Rio Panuco basin in central Mexico.
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