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Characteristics of Endler's livebearers versus guppies

Although they can look similar at first glance, there are distinct differences between Endler's livebearers and guppies.

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Characteristic Endler’s Guppy
Male Accent Colors Males usually show metallic orange, metallic green and velvety black. Males may appear to have a sword (coloration in the caudal fin rays that give the appearance of a swordtail, etc.), but these colored rays remain in the round. The dorsal fin is small and usually clear. Males show blues, reds, greens, golds, oranges, blacks, etc., but most of these colors are matte, not metallic. Guppy swordtails, topswords and lyretails are not only colorations, but the lower and upper rays themselves extend past the round caudal plane. In guppies, it can be clear or sport various colors and often has extended rays.
Female Accent Colors Females have a translucent caudal peduncle. The gravid spot of female Endler’s is much smaller and does not go as far up the flanks as it does in guppies. A female guppy’s caudal peduncle area is opaque. The gravid spot is larger and goes farther up the flanks in guppies.
Body Shape Males and females are not as stocky as guppies. Endler’s also have thinner caudal peduncles. Guppies are more stocky than Endler’s livebearers, especially at the caudal peduncle.
Gonopodium In Endler’s, the thin gonopodium has one hook, a pointed end and a small palp. The gonopodium is thick with several hooks, a rounded end and a large, thick palp.
Size Males are about an inch and females about a quarter inch longer. Males can reach almost 1.5 inches, and females can grow to 2.5 inches.
Brood Size Small broods of a dozen to 15 fry Female guppies the same size have broods of 20 to 30 or more.
Body color Male and female  are a plain golden gray. Guppies are usually gray or silvery gray.
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