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John Bokma MexIT
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Which tiger-rump?

Monday, June 5, 2006 | 0 comments

Someone suggested today to me that the "tiger-rump" tarantula spider I've encountered on several of my field trips might be Cyclosternum fasciatum or Metriopelma zebrata. As someone still quite new to tarantulas, I had never heard of the latter. So I did some research using Google to get more information on the Costa Rican Dwarf Tigerrump.

After looking at some pictures, I checked out the website one of those pictures was on. A Dutch website, and being Dutch myself, I had no problem with reading the information, which roughly translates to:

This 5 centimeters large species looks a lot like Cyclosternum fasciatum. However, the first stripe on the abdomen misses a part. Moreover, the legs don't have the noticable orange-brown hairs. The male doesn't have tibial hooks.

Adult male tarantula with tibial hook visible.
Adult male tarantula with tibial hook visible.

If this information is correct, then I can eliminate Metriopelma zebrata as a possible option for the tarantula spiders I have seen, since the adults are over 5 cm, and the male does have tibial spurs. As for the orange-brown hairs on the leg, clearly visible in a juvenile of this species I keep.

The question remains, however, am I seeing Costa Rican tiger-rumps in Mexico, or is it a different species altogether. If not, did those beautiful tarantulas got introduced into Mexico?

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