Nephilinae

Nephilidae is a spider family commonly referred to as golden orb-weavers. The various genera in the Nephilidae family were formerly placed in Tetragnathidae and Araneidae. All nephilid genera partially renew their webs.

Reproductive behavior

The genera '' Herennia'', '' Nephilengys'' and ''Nephilingis'' display extreme sexually driven selection. The pedipalps of these genera have become highly derived by evolving enlarged, complex palpal bulbs which break off inside the females' copulatory openings after copulation. The broken palps serve as mating plugs, which makes future matings with a mated female more difficult. These genera of spiders also participate in mate guarding; a mated male will stand guard by his female and chase off other males, thereby increasing the mated male's paternity share. Mated males are castrated in the process of mate plugging, though this may be an advantage in mate guarding, as mated males have been observed to fight more aggressively and win more frequently than virgin males. So while the female spiders are still at least potentially polygamous, the males have become monogamous.

Taxonomy

Up to the late 1980s, following Eugène Simon in 1894, '' Nephila'' and its close relatives were considered to make up the subfamily Nephilinae of the family Araneidae. In 1986, Herbert Walter Levi suggested that ''Nephila'' and '' Nephilengys'' belonged in the family Tetragnathidae, based on the structure of the male palp. Cladistic studies in the 1990s appeared to confirm the relationship between nephilines and Tetragnathidae. Further studies refuted this proposal, but did not resolve the relationship with araneids. In 2006, Matjaž Kuntner removed the group from Araneidae and raised the subfamily Nephilinae to the family Nephilidae. However, molecular phylogenetic studies from 2004 onwards consistently placed nephilids within Araneidae. Accordingly, in 2016, Dimitar Dimitrov et al. returned the group to their traditional position as a subfamily of Araneidae. In 2023, the subfamily was resurrected back to family-level and is recognized as a family in the World Spider Catalog.

Phylogeny

A 2013 molecular phylogenetic study suggested that the genera of Nephilinae were related as shown in the cladogram below. It was this study that supported the split between ''Nephilengys'' and ''Nephilingis''.

Although ''Nephila'' appears not to be monophyletic, the authors of the study did not suggest splitting the genus. The phylogeny suggests that male enforced monogamy, via plugging of the female copulatory ducts by males leaving behind their palpal bulbs, is ancestral to the nephilides, and was lost in ''Nephila'' and ''Clitaetra''.

Genera

, the World Spider Catalog accepts the following genera:
* ''Clitaetra'' Simon, 1889 – Africa, Madagascar, Sri Lanka
* '' Herennia'' Thorell, 1877 – South Asia, Australia
* ''Indoetra'' (previously a subgenus of ''Clitaetra'') Kuntner, 2006 – Sri Lanka
* '' Nephila'' Leach, 1815 – pantropical
* '' Nephilengys'' L. Koch, 1872 – South Asia to north Australia
* ''Nephilingis'' Kuntner, 2013 – tropical South America and Africa
* ''Trichonephila'' (previously a subgenus of ''Nephila'') Dahl, 1911 – pantropical

Distribution

The family has a pan-tropical distribution: species of ''Nephilia'', in particular, are found in tropical and subtropical environments in the Americas, Africa, Asia, and Australia.

See also

* Spider families

References

Further reading

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External links

{{Authority control

Araneomorphae families