eggs and hatchlings of the mexican salamander pseudoeurycea cephalica (caudata: plethodontidae)

Clicks: 239
ID: 221672
1998
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Abstract
Eggs and hatchlings of Pseudoeurycea c. cephalica from Parque Nacional Lagunas de Zempoala, Morelos, Mexico are described for the first time. The eggs are similar to eggs of P. cephalica manni and P. belli in being unstranded. Egg capsules resemble P. nigromaculata and P. juarezi in having two gelatinous envelopes. The embryos have extensively webbed hands and feet with a continuous reduction in webbing during embryogenesis, supporting the hypothesis that webbing of the feet is a paedomorphic character. The hatchlings are uniform grayish-black dorsally and slightly paler ventrally. They are robust with broad heads and short tails and lack both vomerine and maxillary teeth. Lack of dentition has previously been found in juveniles of P. belli.
Se describe por primera vez huevos y recién nacidos de Pseudoeurycea cephalica cephalica procedentes del Parque Nacional Lagunas de Zempoala, Morelos, México. Los huevos se paracen a los de P. cephalica manni y P. belli en que no están unidos entre sí por ningún cordón. Se parecen en cuanto a constitución a los de P. nigromaculata y P. juarezi en tener dos capas gelatinosas. Los embriones tienen los pies y manos palmeados, produciéndose una reducción de la superficie palmeada a lo largo de la embriogénesis, lo cual confirma que el palmeado de pies y manos es un carácter pedomórfico. Los recién nacidos son de color gris negruzco, uniforme dorsalmente y de color más claro ventralmente. Son robustos, con cabeza ancha, cola corta y carecen de dientes tanto vomerinos como maxilares. Esta falta de dentición ya fue encontrada anteriormente en juveniles de P. belli.
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Authors ;Thomas Bille
Journal science journal of university of zakho
Year 1998
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