''Progradungula'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...

n large-clawed spiders that was first described by

Raymond Robert Forster Raymond Robert Forster (19 June 1922 – 1 July 2000) was a New Zealand arachnologist and museum director. He was a Fellow of the Entomological Society of New Zealand. Biography Forster was born in Hastings, New Zealand in 1922, and was educa ...

& Michael R. Gray in 1979. it contains only two species: '' P. carraiensis'' and '' P. otwayensis''. The name is derived from Latin ''pro'' ("before"), and the genus name ''

Gradungula ''Gradungula'' is a monotypic genus of South Pacific large-clawed spiders containing the single species, ''Gradungula sorenseni''. It is only found in New Zealand. __TOC__ Etymology The genus name is derived from Latin ' "step" and ' "claw", ...

'', referring to the ancient ancestry of the genus. It is the first discovered web-building

cribellate Cribellum literally means "little sieve", and in biology the term generally applies to anatomical structures in the form of tiny perforated plates. In certain groups of diatoms it refers to microscopically punctured regions of the frustule, or o ...

spider in a "primitive"

araneomorph The Araneomorphae (also called the Labidognatha) are an infraorder of spiders. They are distinguishable by chelicerae (fangs) that point diagonally forward and cross in a pinching action, in contrast to the Mygalomorphae (tarantulas and their cl ...

spider family and helped establish the idea that all araneomorph spiders evolved from cribellate ancestors. These spiders have an uncommon web-making technique and prey-capturing behavior. A small (approximately 25 by 6 mm), tilting, ladder-like platform of cribellate capturing silk is supported by an overhead structure of threads linked to the rock walls and consists of two parallel stabilizing silk lines.

References

{{Taxonbar, from=Q2010549 Araneomorphae genera Gradungulidae Spiders of Australia Taxa named by Raymond Robert Forster