The RTA clade is a clade of entelegyne Araneomorphae. It includes 39 families and around half of all known entelegyne species. Members of the RTA clade have a particular knob (or apophysis) on their palps known as the retrolateral tibial apophysis, ot RTA (Coddington and Levi 1991; Coddington 2005 and references therein). In many cases, the RTA apparently plays a role in facilitating copulation (Huber 1994, 1995).
- Coddington, J.A. 2005. Phylogeny and Classification of Spiders. Pp. 18-24 in D. Ubick, P. Paquin, P.E. Cushing, and V. Roth (eds.) Spiders of North America: an Identification Manual. American Arachnological Society.
- Coddington, J.A. and H.W. Levi. 1991. Systematics and evolution of spiders. Annual Review of Ecology and Systematics 22: 565-592.
- Huber, B.A. 1994. Copulatory mechanics in the funnel-web spiders, Histopona torpida and Textrix denticulata (Agelenidae, Araneae). Acta Zoologica 75: 379-384.
- Huber, B.A. 1995. The retrolateral tibial apophysis in spiders--shaped by sexual selection? Zoological Journal of the Linnean Society 113: 151-163.
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