Suborder Striariidea Cook, 1896

Shear (2000) placed Urochordeumatidae in the superfamily Caseyoidea, due to superficial similarities of the gonopods of Urochordeuma bumpusi to those of members of the genus Caseya Cook & Collins, 1895 . However, closer examination, particularly using scanning electron microscopy, supports placement in the superfamily Striarioidea instead. These features include the presence of a cerotegument (Latin cera = wax, tegumentum = covering; ct, Fig. 1), dorsal ornament of small two-pronged tubercles (Fig. 4), a three-lobed epiproct (Fig. 3) and anteriorly reflexed spinnerets. All of these characters are found in members of the family Striariidae; while species of Caseyidae, the only family of Caseyoidea, lack a cerotegument, have an entirely smooth dorsum, an unlobed epiproct and posteriorly directed spinnerets. Therefore, we remove Urochordeumatidae from Caseyoidea and place it in Striarioidea . As detailed immediately below, U. bumpusi remains in a distinct family from Striariidae, Rhiscosomididae, Apterouridae and Buotidae—its relatives in Striarioidea .