Silvanus lewisi
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Insecta
Order:
Coleoptera
Suborder:
Polyphaga
Superfamily:
Cucujoidea
Family:
Silvanidae
Genus:
Silvanus
Species:
S. lewisi
Binomial name
Silvanus lewisi
Reitter, 1876

Silvanus lewisi, sometimes known as Asian silvanid beetle,[1] is a species of silvan flat bark beetle found throughout the Oriental region and introduced to many parts of the world.[2][3][4]

Distribution

Found throughout the Afro-Oriental tropics, including Congo, Ghana, India, Sri Lanka, China, Vietnam, Taiwan, Japan, Malaysia, Singapore, Java, and Borneo.[2] It also found in Oceanian islands such as the Solomon Islands, the Philippines, and Australia. Meanwhile, it has been introduced to the Western world and can be found in Great Britain and the United States.[2][5]

Description

The average length is about 2.07-2.50 mm. The body is dull yellow-brown in color and covered with short, semi-erect, golden pubescence. The head is broader than it is long, and the width across the eyes is less than the width of the pronotum across anterior angles. The eyes are extremely large and prominent, but the temples are very small (shorter than an eye facet).[2] The antennae have segments 1-6 slightly more elongate. The prothorax is convex and elongated. The anterior angles of the pronotum are produced into spines about half as long as the eyes. The vertex of the head and the pronotum are covered in coarse and dense punctures. The scutellum is moderately large, transverse and pubescent. The elytra are about twice as long as broad and widest near the middle.[6]

Biology

The adults are observed from various stored food products and dunnage.[2][7] At light, they hide under bark of tree stumps. Adults are found from desiccated coconut from Sri Lanka and found on tapioca flour from Thailand as well as on rice and pulses from Myanmar. In African records, they have found from the residues of bark and gum arabic, freshly fallen coconut palms in Ghana, Nigerian groundnut kernels and red beans from Mombasa.[6]

Recorded plant species include: Shorea robusta, Bombax, Sterculia campanulata, Terminalia bialata, Cocos nucifera.[6]

References

  1. ↑ "Asian silvanid beetle: Silvanus lewisi Reitter,1876". Invasive.org. Retrieved 2021-07-09.
  2. 1 2 3 4 5 "A revision of Silvanus (Coleoptera: Silvanidae) from India" (PDF). bishopmuseum. Retrieved 2021-07-09.
  3. ↑ Halstead, David G. H.; Mifsud, David (2003). "Silvanidae and Laemophloeidae (Coleoptera : Cucujoidea) from the Maltese Islands (Central Mediterranean)". Retrieved 2021-07-09.
  4. ↑ Frank, J. Howard; McCoy, Earl D. (1992). "Introduction to the Behavioral Ecology of Immigration. The Immigration of Insects to Florida, with a Tabulation of Records Published Since 1970". The Florida Entomologist. pp. 1–28. doi:10.2307/3495477. Retrieved 2021-07-09.
  5. ↑ D., Ouellette, Gary (2018). "Intercepted Silvanidae [Insecta: Coleoptera] From The International Falls, MN [USA] Port-Of-Entry". The Great Lakes Entomologist. Retrieved 2021-07-09.{{cite web}}: CS1 maint: multiple names: authors list (link)
  6. 1 2 3 "Systematics of Silvanidae (Coleoptera: Clavicornia) from India and some neighbouring areas" (PDF). ir.nbu.ac.in. Retrieved 2021-07-08.
  7. ↑ Zimmerman, Michael L. (1990). "Coleoptera Found in Imported Stored-Food Products Entering Southern California and Arizona between December 1984 through December 1987". The Coleopterists Bulletin. pp. 235–240. Retrieved 2021-07-09.


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