Phalloceros circummontanus
Phalloceros circummontanus Souto-Santos, Mejia, Arcila & Buckup, 2025
Phalloceros circummontanus
photo by Souto-Santos, I.C.A. et al., 2025

Family:  Poeciliidae (Poeciliids), subfamily: Poeciliinae
Max. size:  4.26 cm SL (male/unsexed)
Environment:  benthopelagic; freshwater
Distribution:  South America: Brazil.
Diagnosis:  Dorsal soft rays (total): 7-9; Anal soft rays: 9-11; Vertebrae: 31-32. This species is distinguished by the following set of characters: tip of the female urogenital papilla oriented caudally; presence of hook in the gonopodial appendix; convexity of the dorsal profile between the tip of the snout and the origin of the dorsal fin in both males and females; dark pigmented lateral spot located modally in the 16th scale; presence of seven or eight dorsal-fin rays, very rarely nine; posterior rounded flap on the gonopodial appendix in small (15.4-21.2 mm SL) specimens; flattened hood-like projection of skin located between the anus and the urogenital papilla of most females; absence of symmetrical hood or hood (Ref. 137470).
Biology:  This species inhabits still water and fast-flowing hill-side streams, with clear, black or turbid water, and a substrate composed of mud, sand and gravel bottoms (Ref. 137470).
IUCN Red List Status: Not Evaluated (N.E.) Ref. (130435)
Threat to humans:  harmless


Source and more info: www.fishbase.org. For personal, classroom, and other internal use only. Not for publication.