Micrathena


The spider genus Micrathena contains more than hundred species, most of them Neotropical woodland orb-weavers. Only three species occur in the eastern United States: females of M. gracilis (the Spined Micrathena) have five pairs of conical tubercles on the abdomen, female M. mitrata have two short posterior pairs, and female M. sagittata (the Arrow-shaped Micrathena) have three pairs. Micrathena sagittata  is found in the eastern United States and throughout Central America. It is a striking spider with a distinctive arrow-shaped abdomen which is largely yellow, with black depressions above and variable red and black patterning below.


Males are up to 5 millimetres (0.20 in) in length (excluding legs), but females are much larger at around 9 millimetres (0.35 in). The males lack spines. They leave a hole in the center of their web to assist in motion. The photos on this page are of the Spined Micrathena and the Arrow Shaped Micrathena.


All photos are copyright to their owners and may not be reproduced without permission. 

Spined Micrathena (M. gracilis)

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Arrow Shaped Micrathena (M. sagittata)

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