Two new arachnids discovered in Brazilian caves (photos)



Scientists have discovered two of short-tailed whipscorpions (in the order Schizomida) in limestone in Brazil, according to a new paper published in PLoS ONE. The new species—dubbed and —add new knowledge to a group of that is little known in outside of the Amazon.

“Schizomids occur mostly in poorly sampled habitats, like the soil leaf litter, termite and ant nests, and caves,” the researchers write, noting that these habitats are under-explored in South America. “Subterranean habitats in particular can harbor large schizomid populations, and are a promising source of undescribed species.”

Species in the Schizomida order are generally quite small (under one centimeter) and are identified by their short tails, known to scientists as flagellum. Males of each species posses distinct tails, which the females grip during mating.

While both the were discovered in limestone caves, the scientists believe they may survive outside caves as well. Even the absence of eye-spots—found in both the new species—does not mean they are cave dependent, since many short-tailed whipscorpions lack eye-spots. More research, however, is needed before their full distribution can be determined.

Male of Rowlandius ubajara. Arrows show size differential of pedipalps (appendages) in males and females. Photo by: Santos et al.

Female of Rowlandius ubajara. Arrows show size differential of pedipalps (appendages) in males and females. Photo by: Santos et al.

Female of Rowlandius potiguara. Photo by: Santos et al.

CITATION: Santos AJ, Ferreira RL, Buzatto BA (2013) Two New Cave-Dwelling Species of the Short-Tailed Whipscorpion Genus Rowlandius (Arachnida: Schizomida: Hubbardiidae) from Northeastern Brazil, with Comments on Male Dimorphism. PLoS ONE 8: e63616. doi:10.1371/journal.pone.0063616

This article was written for Mongabay.com and re-posted on Focusing on Wildlife.

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