Description

Xiphophorus milleri is a small to medium Xiphophorus species. Its body is slender. Nearly a half of specimens have melanophore markings of varying sizes. These are arranged in one of two types of patterns: irregular dark spots on the body; and definite rows of spots on the side. Three tail patterns exist: one with a single small spot (similar to those of X. variatus and X. maculatus), one with a single large spot (similar to that of some X. variatus specimens), and a bar-like pattern (similar to those of X. montezumae and X. pygmaeus). Adult males have deep yellow-orange bellies.[3]

Females grow to 4.5 cm (1.8 in) total length, while males attain 2.5 cm (0.98 in). The males are elongated, while the females appear humpbacked and compact.[4]

Distribution and habitat

Xiphophorus milleri was discovered in a steep-banked stream flowing into Lake Catemaco in Mexico. It prefers clear or white water habitats with sparse green algae growth on a substrate of mostly sand and silt with occasional rocks.[5] X. helleri is found in the same habitat.[6] It appears to be restricted to Lake Catemaco and its tributaries.[2]

Reproduction

Xiphophorus milleri is a livebearer; the female gives birth every 24 to 28 days. The size of each brood normally ranges from 15 to 50 fry. Filial cannibalism is rare.[7]