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Silvanus difficilis

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Species of beetle

Silvanus difficilis
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Silvanidae
Genus: Silvanus
Species: S. difficilis
Binomial name
Silvanus difficilis
Halstead, 1973

Silvanus difficilis is a species of silvan flat bark beetle widespread in Oriental region. It is introduced to Australia via timber and also to Costa Rica.

Distribution

Many Oriental countries including, Malaya, India, Sri Lanka, Vietnam, Taiwan, Singapore, Sumatra, Java, Christmas Island, Sarawak, Borneo, Philippines, Moluccas, and New Guinea. Also found in Oceanian regions of Solomon Islands, Samoan Islands, and introduced to Australia. There are records from West Africa, Britain, New Ireland and Costa Rica.

Description

Extremely variable species in appearance, very similar to Silvanus lewisi, Silvanus robustus and Silvanus productus. Two distinct forms are described and identified: 'Normal form' and 'New Guinea form'. The 'Normal form' clearly identified from the 'New Guinea form' due to its short temple, and wider and shorter prothorax.

Average length is about 2.17 to 2.64 mm. Body elongated, and slightly depressed. Body color ranges from dull brown to yellow-brown and covered with short, semi-erect, golden pubescence. Head broader than long. Punctures on frontal triangle often ocellate. Eyes are large with temples as long as eye-facets. Antennae broad and clubbed. Pronotum broad and more elongate. Pronotum puncturation is coarse and dense, similar to head. Prosternum with tuberculate surface which become rugose towards sides. Prothorax convex, and elongated. Scutellum large, transverse and pubescent.

Ecology

Adults have been collected from Shorea robusta in India. They have found among commodities imported to Britain from the Oriental region.

References

  1. ^ "A revision of the genus Silvanus Latreille (sl)(Coleoptera: Silvanidae)" (PDF). hbs.bishopmuseum.org. Retrieved 2021-07-08.
  2. Peck, Stewart B.; Heraty, John; Landry, Bernard; Sinclair, Bradley J. (1998). "Introduced Insect Fauna of an Oceanic Archipelago: The Galápagos Islands, Ecuador". American Entomologist. pp. 218–237. doi:10.1093/ae/44.4.218. Retrieved 2021-07-09.
  3. Pal, T.K.; Gupta, T. Sen (April 1977). "A revision ofSilvanus(Coleoptera: Silvanidae) from India". Oriental Insects. pp. 269–284. doi:10.1080/00305316.1977.10434545. Retrieved 2021-07-09.
  4. "Silvanus difficilis Halstead, 1973". Atlas of Living Australia. Retrieved 2021-07-08.
  5. "SILVANUS MUTICUS SHARP, 1899: AN AMERICAN SILVANID FOUND OUT-OF-DOORS IN TWO GREEK ISLANDS" (PDF). Boll. Mus. Civ. St. nat. Venezia, 53 (2002) 2002: 207-211. Retrieved 2021-07-08.
  6. ^ "Systematics of Silvanidae (Coleoptera: Clavicornia) from India and some neighbouring areas" (PDF). ir.nbu.ac.in. Retrieved 2021-07-08.
Taxon identifiers
Silvanus difficilis


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