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A New Species of Allodontichthys (Cyprinodontiformes: Goodeidae), with Comparative Morphometrics for the Genus

Mary Rauchenberger
Copeia
Vol. 1988, No. 2 (May 18, 1988), pp. 433-441
DOI: 10.2307/1445884
Stable URL: http://www.jstor.org/stable/1445884
Page Count: 9
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A New Species of Allodontichthys (Cyprinodontiformes: Goodeidae), with Comparative Morphometrics for the Genus
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Abstract

Allodontichthys polylepis, new species, is described from two localities in the upper reaches of the Rio Ameca basin, Jalisco, Mexico. Its distribution is disjunct from that of the rest of the genus, which is restricted to the Rio Armeria and Rio Coahuayana systems. The new species differs from the other three species of Allodontichthys primarily in a higher lateral-line scale count. Shape differences between the four species and between the sexes are examined using multivariate morphometrics, and growth patterns for each sex (as shown by allometric coefficients) are compared. These analyses distinguish A. hubbsi from its congeners, but do not resolve the remaining three species. /// Se describe Allodontichthys polylepis, una nueva especie de la familia Goodeidae, de la cuenca del Río Ameca, cerca de las villas de Ameca y Guachinango, Jalisco, México. Su distribución es descoyuntado de la distribución de los otros de este género, que se limita a las cuencas de los ríos Armeria y Coahuyana. Allodontichthys polylepis se distingue de los tres otros especies de Allodontichthys basicamente por el grande numéro de escamas de la línea lateral. Las diferencias de la forma del cuerpo entre las cuatro especies de este género y entre los dos sexos de A. polylepis se examenen con la metodologia de morfométrico, y los crecimientos alométricos por cada sexo de las cuatro especies que son presentados. Allodontichthys hubbsi se distingue de sus congeneres en estos analisises, pero los tres otros especies no se resolven.

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