Micrathena horrida

M. horrida is found in forest environments throughout its range.^[2]

Females range from 7.0 to 11.5 mm in total length, while males are smaller at 4.5 to 5.0 mm.^[2] The female has an orange-brown carapace with darker brown sclerotized areas and some dark gray markings above the rim. The sternum and legs are orange-brown, while the abdomen is gray to orange with black markings. The abdomen typically bears twelve or more prominent humps or tubercles, distinguishing it from related species like M. gracilis which has only ten humps.^[2]

Males have a brown carapace and grayish brown sternum, with lighter brown legs. The male abdomen is brown with white patches along the margin and some gray and black pigment above. A distinctive feature of males is the segmented posterior abdomen. The male can be identified by characteristics of the palpus, particularly the paracymbium having a keel almost parallel to the axis of the cymbium.^[2]

Some individuals display a bold pattern of black patches on white on the dorsum of the abdomen. The carapace sometimes has dimples, and the abdomen of females may be slender with humps or have a tail-like extension.^[2]