Arbanitis robertsi

Arbanitis robertsi
near Gerringong, Australia
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Class:	Arachnida
Order:	Araneae
Infraorder:	Mygalomorphae
Family:	Idiopidae
Genus:	Arbanitis
Species:	A. robertsi
Binomial name
Arbanitis robertsi (Main & Mascord, 1974)
Synonyms [1]
Dyarcyops robertsiMain & Mascord, 1974 Misgolas robertsi(Main & Mascord, 1974)

Arbanitis robertsi is a species of tube-dwelling spider in the family Idiopidae found in and near rainforests in New South Wales and Queensland, Australia. A mid to large sized spider which builds a tube of web that extends from the burrow. The tube is attached to rocks, tree ferns or the base of trees. Thousands of these tubes were recorded by Sid Jackson in November 1922 at the south eastern end of Wallis Lake. "Up to three feet long, and half an inch wide". Situated on damp ground, close to freshwater streams. ^{[2] [3]}

Description

Body length of the female is 27mm, male 17 mm. The male is a darker brown colour and with longer legs than the female. The burrow is usually straight, or slightly inclined with no brood shaft. The burrow usually extends around 30 cm underground. The tube above ground is usually seen around 15 to 20 cm above ground level. The tube is loosely connected to the burrow at ground level, and pulling the tube breaks it above ground and leaves the spider safe underground.

Tube spiders may live in colonies, where tubes are attached to each other, resembling organ pipes. The tubes are camoflauged with particles of earth, moss and lichen. The vibration of crawling insects on the tube is said to alert the spider to potential prey. ^{[4] [5]} Prey is caught at the opening of the tube, including moths, beetles and other crawling insects. ^[3]

Egg sac

The egg sac is 24 mm x 15 mm, rectangular in shape, constructed of white silk, secured within the burrow by the female. Eggs around 50 in number, a golden yellow colour, non glutinous. ^[3]

Taxonomy

A. robertsi was first described as Dyarcyops robertsi by Barbara York Main & Ramon Mascord in 1974, ^{[1] [6]} and was transferred to the genus, Misgolas in 1992 by Graham Wishart, ^{[7] [8]} and then to the genus, Arbanitis, in 2017 by Michael Rix and others. ^{[7] [9]}

References

1. Zicha, Ondrej. "BioLib: Biological library: Arbanitis robertsi". www.biolib.cz. Retrieved 1 January 2022.
2. McKeown, Keith C. (1952). Australian Spiders. Australian Museum: Sirius Books. p. 139.
3. Australian Spiders in Colour - Ramon Mascord. 1970 SBN 589 07065 7, page 12
4. "Tube Spiders". Australian Museum. Retrieved 15 August 2020.
5. "Arbanitis robertsi". Atlas of Living Australia. Retrieved 15 August 2020.
6. Barbara York Main; Ramon Mascord (1 January 1974). "Description and natural history of a "tube-building" species of dyarcyops from New South Wales and Queensland (Mygalomorphae : Ctenizidae)". Journal of the Entomological Society of Australia (N.S.W.). 8: 15–21. ISSN   0071-0725. Wikidata   Q107367468.
7. Natural History Museum Bern. "NMBE - World Spider Catalog: Arbanitis robertsi". wsc.nmbe.ch. Retrieved 1 January 2022.
8. Graham Wishart (1992). "New species of the trapdoor spider genus Misgolas Karsch (Mygalomorphae: Idiopidae) with a review of the tube-building species" (PDF). Records of the Australian Museum. 44 (3): 263–278. doi:10.3853/J.0067-1975.44.1992.35. ISSN   0067-1975. Wikidata   Q92173316.
9. Michael G. Rix; Robert J. Raven; Barbara Y. Main; Sophie E. Harrison; Andrew D. Austin; Steven J. B. Cooper; Mark S. Harvey (2017). "The Australasian spiny trapdoor spiders of the family Idiopidae (Mygalomorphae : Arbanitinae): a relimitation and revision at the generic level". Invertebrate Systematics. 31 (5): 566–634. doi:10.1071/IS16065. ISSN   1445-5226. Wikidata   Q56034666.