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Idiosoma

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For the anatomical structure of mites, see Acari § Morphology.

Idiosoma
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida
Order: Araneae
Infraorder: Mygalomorphae
Family: Idiopidae
Genus: Idiosoma
Ausserer, 1871[1]
Type species
I. sigillatum
Species

29, see text

Synonyms[1]

Idiosoma is a genus of Australian armored trapdoor spiders that was first described by Anton Ausserer in 1871.[3] Originally placed with the Ctenizidae, it was moved to the armored trapdoor spiders in 1985.[4] The name is derived from the Greek ἴδιος (idios), meaning "individual, unique", and σῶμα (soma), meaning "body", referring to the distinctive structure of the abdomen.[3]

The skin of their opisthosoma is hardened, with a flattened end and deep grooves running along the sides. The thickened skin helps to reduce water loss in its dry habitat. It also serves as a kind of plug to shield itself from predators. This phenomenon is called phragmosis and occurs in perfection in the spider genus Cyclocosmia (Ctenizidae). However, some parasitic wasps have evolved paper-thin abdomens and long, slender ovipositors and lay their eggs on the softer skin at the front of the spider's opisthosoma.[5]

It digs burrows up to 32 centimetres (13 in) deep, where the temperature is relatively constant during the seasons. When prey triggers any of the trip-lines radiating from the burrow's entrance, the spider runs out of the burrow to capture ants, beetles, cockroaches, millipedes and moths. This is unlike many trapdoor spiders that very rarely leave their burrow. Males actively look for females, and mating takes place in the female's burrow. She lays her eggs during late spring and early summer. The spiderlings hatch in mid-summer, and stay inside the burrow until early winter, when the climate gets more humid.[5]

The Black rugose trapdoor spider (Idiosoma nigrum) can grow up to 30 millimetres (1.2 in) long. Males can grow up to 18 millimetres (0.71 in) in body length.

Species

As of May 2019 it contains twenty-nine species:[1]

References

  1. ^ a b c "Gen. Idiosoma Ausserer, 1871". World Spider Catalog Version 20.0. Natural History Museum Bern. 2019. doi:10.24436/2. Retrieved 2019-06-12.
  2. ^ a b Rix, M. G.; et al. (2017). "The Australasian spiny trapdoor spiders of the family Idiopidae (Mygalomorphae: Arbanitinae): a relimitation and revision at the generic level". Invertebrate Systematics. 31 (5): 590. doi:10.1071/IS16065.
  3. ^ a b Ausserer, A. (1871). "Beiträge zur Kenntniss der Arachniden-Familie der Territelariae Thorell (Mygalidae Autor)". Verhandlungen der Kaiserlich-Königlichen Zoologisch-Botanischen Gesellschaft in Wien. 21: 117–224.
  4. ^ Raven, R. J. (1985). "The spider infraorder Mygalomorphae (Araneae): Cladistics and systematics". Bulletin of the American Museum of Natural History. 182: 138.
  5. ^ a b Australian Museum Online

Further reading

  • Australian Museum Online (2003): Black Rugose Trapdoor Spider fact sheet — with picture
  • Main, Barbara York (1952): Notes on the genus Idiosoma, a supposedly rare Western Australian trap-door spider. W. Aust. Nat. 3: 130-137.
  • Main, Barbara York (1957): Biology of aganippine trapdoor spiders (Mygalomorphae: Ctenizidae). Aust. J. Zool. 5: 402-473.
  • Main, Barbara York (1985): Further studies on the systematics of ctenizid trapdoor spiders: A review of the Australian genera (Araneae: Mygalomorphae: Ctenizidae). Aust. J. Zool. (suppl. Ser.) 108: 1-84.
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