MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
The Combing of Cribellar Silk by the Prithine Misionella mendensis, with Notes on Other Filistatid Spiders (Araneae: Filistatidae)
LOPARDO, L.; RAMÍREZ, M. J.
AMERICAN MUSEUM NOVITATES
American Museum of Natural History
Año: 2007 vol. 3563 p. 1 - 1
We present the first observations of the combing and attaching behavior in the subfamilyPrithinae (Filistatidae), taken from Misionella mendensis. We compare its web architecture withthat of other prithines (Pritha nana and Pikelinia sp. from Chile) and filistatines (Kukulcaniahibernalis and Filistata insidiatrix). The combing behavior of M. mendensis corresponds to thestereotyped type I combing behavior, as is known for other filistatids. However, M. mendensisattaches the cribellar segments in a unique way, splitting the cribellar segment longitudinally andpushing each half to the substrate, attaching the silk with the tarsi of both legs IV simultaneously.These stereotyped movements result in web units of a very characteristic structure. We report thesame split attachment behavior in the prithine Pikelinia tambilloi. We scored these observationsinto a previous dataset for filistatid relationships. Because of the missing observations onattachment behavior in the North American basal genus Filistatinella, the sister group of all otherprithines, the evolution of split cribellar strands is a potential synapomorphic characteristic for thePrithinae, or at least the subgroup excluding its basal taxon.