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Conjoined twins in the burrowing crayfish, Virilastacus rucapihuelensis Rudolph & Crandall, 2005 (Decapoda, Parastacidae)

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[The occurrence of two pairs of newly hatched conjoined twins is reported in an oviposition of a female-phase, intersex specimen of the burrowing parastacid Virilastacus rucapihuelensis, caught in the peatlands of Rucapihuel, southern Chile. These conjoined twins were found among 49 normal, stage 1 juveniles and constitute the third reported case of Siamese juveniles in freshwater astacids. Their external morphological traits are described, as well as the type and extent of their fusion; a morphological comparison is made between them and previous cases of conjoined twins in Astacoidea. The stage of embryonic development when they would have formed, and the probable causes of their origin, are also analysed. Se reporta el hallazgo de dos parejas de gemelos siameses, recientemente eclosionados, en una ovipostura de un espécimen intersexo en fase hembra del parastácido excavador. Virilastacus rucapihuelensis, capturado en los humedales de la localidad de Rucapihuel en el sur de Chile. Estos siameses se encontraron con otros 49 juveniles en estado 1 normales y constituyen el tercer caso reportado de juveniles siameses en astácidos de agua dulce. En ellos se describen sus rasgos morfológicos externos, como así mismo el tipo y extensión de su fusión, se establece una comparación morfológica entre ellos y con aquellos casos previos de siameses en Astacoidea. También se analiza el momento del desarrollo embrionario en que ellos se habrían formado y las probables causas de su origen., The occurrence of two pairs of newly hatched conjoined twins is reported in an oviposition of a female-phase, intersex specimen of the burrowing parastacid Virilastacus rucapihuelensis, caught in the peatlands of Rucapihuel, southern Chile. These conjoined twins were found among 49 normal, stage 1 juveniles and constitute the third reported case of Siamese juveniles in freshwater astacids. Their external morphological traits are described, as well as the type and extent of their fusion; a morphological comparison is made between them and previous cases of conjoined twins in Astacoidea. The stage of embryonic development when they would have formed, and the probable causes of their origin, are also analysed. Se reporta el hallazgo de dos parejas de gemelos siameses, recientemente eclosionados, en una ovipostura de un espécimen intersexo en fase hembra del parastácido excavador. Virilastacus rucapihuelensis, capturado en los humedales de la localidad de Rucapihuel en el sur de Chile. Estos siameses se encontraron con otros 49 juveniles en estado 1 normales y constituyen el tercer caso reportado de juveniles siameses en astácidos de agua dulce. En ellos se describen sus rasgos morfológicos externos, como así mismo el tipo y extensión de su fusión, se establece una comparación morfológica entre ellos y con aquellos casos previos de siameses en Astacoidea. También se analiza el momento del desarrollo embrionario en que ellos se habrían formado y las probables causas de su origen.]

Affiliations: 1: Departamento de Ciencias Básicas, Universidad de Los Lagos, Casilla 933, Osorno, Chile

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/content/journals/10.1163/156854008x369528
2008-12-01
2016-09-30

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