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1 August 2002 THE OCCURRENCE OF ABDOMINAL URTICATING HAIRS DURING DEVELOPMENT IN THERAPHOSINAE (ARANEAE, THERAPHOSIDAE): PHYLOGENETIC IMPLICATIONS
Fernando Pérez-Miles
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Abstract

The occurrence of abdominal urticating hair types throughout juvenile development is studied in five Uruguayan theraphosid species of different genera. Adults of three of these species have urticating hairs of Types III and IV while the other two species have Types III and I. Considering spider size as an estimator of development, Type I or IV occurred early, in small juveniles, while Type III hairs always occurred after the other types during development. The homology of urticating hairs and their use in phylogenetic studies of Theraphosinae is discussed. Sexual dimorphism in the occurrence of urticating hair types is analyzed and a hypothetical explanation is proposed.

RESUMEN. La presencia de pelos urticantes abdominales a través del desarrollo es estudiada en juveniles de cinco especies de terafósidas uruguayas de géneros diferentes. Los adultos de 3 de estas especies presentan pelos urticantes tipo III y IV mientras que las otras dos presentan los tipos III y I. Considerando el tamaño como indicador del desarrollo los tipos I o IV aparecen tempranamente mientras que los pelos tipo III ocurren siempre después que los otros tipos, durante el desarrollo. Se discute la homología de los pelos urticantes y su uso en la filogenia de Theraphosinae. Se propone una explicación para el dimorfismo sexual encontrado en estos pelos para algunas especies de terafósidas.

Fernando Pérez-Miles "THE OCCURRENCE OF ABDOMINAL URTICATING HAIRS DURING DEVELOPMENT IN THERAPHOSINAE (ARANEAE, THERAPHOSIDAE): PHYLOGENETIC IMPLICATIONS," The Journal of Arachnology 30(2), 316-320, (1 August 2002). https://doi.org/10.1636/0161-8202(2002)030[0316:TOOAUH]2.0.CO;2
Received: 1 July 2001; Published: 1 August 2002
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