A Remarkable Species Flock of Pupfishes, Genus Cyprinodon, from Yucatán, México

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Abstract
Four species of Cyprinodon occur in Laguna Chichancanab, an endorheic basin in the interior of the Yucatan Peninsula, Mexico. Three of these are described as new. Each new species has unique traits that separate it from the 4th pupfish in the lake, C. beltrani Alvarez, and from all other known pupfishes. C. maya sp. nov. is a carnivore characterized by large size (to 100 mm TL) and stout build; C. labiosus sp. nov. has highly modified lips; and C. sinus sp. nov. is a mid-water planktivore with the lower jaw almost vertical. All 4 spp. live in complete sympatry throughout the basin. They most closely resemble C. variegatus artifrons Hubbs, which inhabits the margins of the Yucatan Peninsula.

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