Two new arachnids discovered in Brazilian caves (photos)

Jeremy Hance
May 29, 2013

Scientists have discovered two new species of short-tailed whipscorpions (in the order Schizomida) in limestone caves in Brazil, according to a new paper published in PLoS ONE. The new species—dubbed Rowlandius ubajara and Rowlandius potiguara—add new knowledge to a group of arachnids that is little known in South America 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 new species 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 new species Rowlandius ubajara. Photo by: Santos et al.
Male of new species Rowlandius ubajara. Arrows show size differential of pedipalps (appendages) in males and females. Photo by: Santos et al.

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

Male of new species Rowlandius ubajara. Photo by: Santos et al.
Female of new species 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(5): e63616. doi:10.1371/journal.pone.0063616

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Jeremy Hance
mongabay.com (May 29, 2013).

Two new arachnids discovered in Brazilian caves (photos) .