Mexican topminnow

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Mexican topminnow

fish

Also known as: Goodeidae

Learn about this topic in these articles:

classification

In atheriniform: Annotated classification
Family Goodeidae (Mexican topminnows)Live-bearing, but male lacks elaborate intromittent organ found in poeciliids. About 10 genera, in rivers draining the Mexican Plateau; length to about 10 cm (4 in.).Family JenynsiidaeSmall fishes with asymmetrical genital organs; 1 genus; rivers of South America.Family Anablepidae (four-eyed
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viviparity

In atheriniform: Natural history
In the Mexican topminnows (Goodeidae) viviparity has developed, the embryos absorbing nourishment within the oviduct of the mother by means of threadlike outgrowths. In the live-bearers (Poeciliidae), an abundant group in the American tropics and subtropics, sexual dimorphism affects many parts of the body. Males have a…
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