Biology:Orsonwelles
| Orsonwelles | |
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| Orsonwelles graphicus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Subphylum: | Chelicerata |
| Class: | Arachnida |
| Order: | Araneae |
| Infraorder: | Araneomorphae |
| Family: | Linyphiidae |
| Genus: | Orsonwelles Hormiga, 2002[1] |
| Type species | |
| O. polites Hormiga, 2002
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| Species | |
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13, see text | |
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| Range of Orsonwelles in the Hawaiian Islands | |
Orsonwelles is a genus of United States dwarf spiders that was first described by G. Hormiga in 2002.[2] They are all native to the Hawaiian Islands, each species occurring on a single island, often at high elevations. One species has not been collected since the 1890s, and is believed to be extinct. The name honors the actor and film-maker Orson Welles. Many of the species names commemorate elements from Welles' films, radio productions, or roles.
The first species were described in 1900 by the French naturalist Eugène Simon, who described Orsonwelles malus (as Labulla torosa) and Orsonwelles graphicus (as Labulla graphica).[3] In 2002, Gustavo Hormiga described eleven new species, establishing the new genus Orsonwelles. The Labulla species became torosus and graphicus because Orsonwelles is a masculine noun.[2]
Description
The carapace and abdomen are dark brown to gray. A light band runs down the middle of the carapace. The abdomen is oval-shaped, and sometimes has light blotches or chevron-shaped markings on the dorsal surface. The second limb segments on the third and fourth leg pairs have one to six trichobothria, a trait unique among the Linyphiidae. Their chelicerae are massive and have many cheliceral teeth.[2]
They are nocturnal, remaining hidden during the day and appearing upside down in the center of their webs at night. Large chelicerae with teeth allow them to be generalist predators, feeding on a variety of arthropods, including moths and terrestrial amphipods.[2] Several species of Argyrodes, a genus of smaller spiders and occasional kleptoparasites of Orsonwelles, have been found caught in their webs.[4]
They primarily live in remnants of rainforests and mixed mesic forests. Many are restricted to higher elevations, where environmental disturbance is less severe and non-native species less common, but some species occur in disturbed areas as low as 500 m (1,600 ft) above sea level.[2]
In part, due to island gigantism, a phenomenon causing lineages on islands to evolve larger than their mainland relatives, Orsonwelles contains the largest known members of the family Linyphiidae. Females reach body lengths of 8.06 to 14.07 millimetres (0.317 to 0.554 in), and males reach 6.2 to 11.35 millimetres (0.244 to 0.447 in). The largest individuals recorded are in the species O. malus. The next largest is Laminacauda gigas, attaining body lengths of just under 10 millimetres (0.39 in).[2]
Species
Each species is endemic to a single island, with six species on Kauai, three on Oahu, two on Molokai, and one each on Maui and the Island of Hawaii.[2][5] The species O. torosus of Kauai is believed to be extinct, as it was last collected in the 1890s and has not been collected since.
(As of May 2019) it contains thirteen species:[1]
- Orsonwelles ambersonorum Hormiga, 2002 – Oahu (Named for Welles' 1942 film The Magnificent Ambersons)
- Orsonwelles arcanus Hormiga, 2002 – Oahu (Named for Welles' 1955 film Mr. Arkadin (also known as Confidential Report; arcanus meaning "hidden" or "confidential" in Latin))
- Orsonwelles bellum Hormiga, 2002 – Kauai (Named for Welles' 1938 radio drama The War of the Worlds (bellum meaning "war" in Latin))
- Orsonwelles calx Hormiga, 2002 – Kauai (Named for Harry Lime, Welles' character in Carol Reed's 1949 film The Third Man (calx meaning "lime" in Latin))
- Orsonwelles falstaffius Hormiga, 2002 – Maui (Named for the character Falstaff, played by Welles in his 1966 film Chimes at Midnight)
- Orsonwelles graphicus (Simon, 1900) – Hawaii (Graphicus, Latin: "belonging to painting or drawing")
- Orsonwelles iudicium Hormiga, 2002 – Kauai (Named for Welles' 1962 film The Trial (iudicium meaning "judgement" or "trial" in Latin))
- Orsonwelles macbeth Hormiga, 2002 – Molokai (Named for Welles' 1948 film Macbeth)
- Orsonwelles malus Hormiga, 2002 – Kauai (Named for Welles' 1958 film Touch of Evil (malus meaning "evil" in Latin))
- Orsonwelles othello Hormiga, 2002 – Molokai (Named for Welles' 1952 film Othello)
- Orsonwelles polites Hormiga, 2002 (type) – Oahu (Named for Welles' 1941 film Citizen Kane (polites meaning "citizen" in Greek))
- Orsonwelles torosus (Simon, 1900) – Kauai (Torosus, Latin for "muscular" or "fleshy")
- Orsonwelles ventus Hormiga, 2002 – Kauai (Named for Welles' unfinished film The Other Side of the Wind (ventus meaning wind in Latin))
See also
- Endemism in the Hawaiian Islands
- List of organisms named after famous people (born 1900–1949)
- List of Linyphiidae species (I–P)
- Predatoroonops, a genus of spiders with species named after characters from the 1987 film Predator
References
- ↑ 1.0 1.1 Gloor, Daniel; Nentwig, Wolfgang; Blick, Theo; Kropf, Christian (2019). Gen. Orsonwelles Hormiga, 2002. Natural History Museum Bern. doi:10.24436/2. http://www.wsc.nmbe.ch/genus/1513. Retrieved 2019-06-16.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Hormiga, G. (2002). "Orsonwelles, a new genus of giant linyphiid spiders (Araneae) from the Hawaiian Islands". Invertebrate Systematics 16 (3): 369–448. doi:10.1071/IT01026. http://www.gwu.edu/~spiders/content/publications/Hormiga%202002.pdf.
- ↑ Simon, E. (1900), "Arachnida", in Sharp, D., Fauna Hawaiiensis, or the zoology of the Sandwich Isles: being results of the explorations instituted by the Royal Society of London promoting natural knowledge and the British Association for the Advancement of Science, University Press, Cambridge, pp. 463–464, https://archive.org/stream/faunahawaiiensis02shar#page/n493/mode/2up, retrieved 2020-05-18
- ↑ Rivera, Malia; Gillespie, Rosemary G. (2010). "New species of endemic kleptoparasitic spiders of the genus Argyrodes (Araneae: Theridiidae) in the Hawaiian Islands". Pacific Science 64 (2): 221–231. doi:10.2984/64.2.221. http://scholarspace.manoa.hawaii.edu/bitstream/10125/23103/1/vol64n2-221-232.pdf.
- ↑ Hormiga, Gustavo; Arnedo, Miquel; Gillespie, Rosemary G. (2003). "Speciation on a Conveyor Belt: Sequential Colonization of the Hawaiian Islands by Orsonwelles Spiders (Araneae, Linyphiidae)". Systematic Biology 52 (1): 70–88. doi:10.1080/10635150390132786. PMID 12554442.
External links
- Orsonwelles at the World Spider Catalog
- The Hormiga Laboratory at George Washington University
Wikidata ☰ Q2977464 entry
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