Bruchidius siliquastri

Bruchidius siliquastri is a species of bean weevil.[1] It was first found in pods of Cercis siliquastrum in China, and has thence been found in several continents.[2][3] Its length ranges from 2.8 to 3.7 millimetres (0.11 to 0.15 in). Its body is short and ovate, with a black integument. The apex of its femora and the ventral part of its hind tarsi are reddish. Its vestiture is made of thin and short setae; dorsally setae are a whitish colour, denser on the scutellum. Its pygidium is also covered with setae.[1] Its name is derived from its host plant.

Bruchidius siliquastri
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Insecta
Order:
Coleoptera
Suborder:
Polyphaga
Infraorder:
Cucujiformia
Superfamily:
Chrysomeloidea
Family:
Chrysomelidae
Subfamily:
Bruchinae
Genus:
Bruchidius
Species:
B. siliquastri
Binomial name
Bruchidius siliquastri
Delobel, 2007

Description

Male

The head of the male is short, with bulging eyes. Its frons lacks a carina. Its pronotum is very convex, wider at the base, while the elytra are short; its third stria possesses a small tooth. The hind femora are incrassate, with a carinate mesoventral margin. The hind tibiae are apically widened, with both dorsomesal and ventral carinae that are strong. Its first tarsomere does not have an apical denticle ventrally.[1]

On its abdomen, ventrite 5 is emarginate, as long as the 4th sternite. Its first ventrite has a patch of short erect setae basally, which are somewhat scaly. Its pygidium is subcircular, with its apex turned under. The median lobe of its genitalia has a total length of 0.27 mm; its ventral valve is subtriangular and rather sclerotised, bearing sensilla and a row of 10-13 setae on each side. Its internal sac possesses 2 or 3 pointed denticles. The apex of its parameres contain abundant setae.[1]

Female

The female is similar to the male, but its last abdominal ventrite is not emarginate and is longer than its 4th; the pygidium is narrower than the male's, bearing a pair of foveae, which are 0.3–0.4 mm long and 0.1 mm wide. Its spermatheca is narrow and curved, with an elongated apical diverticulum. The opening of its spermathecal gland duct is basal, contiguous with its opening. Its vagina shows a large sclerite on its dorsal side, slightly behind the spermathecal duct opening. Its bursa copulatrix does not exhibit spines.[1]

Distribution

Firstly described from Southern France, it is also known in China (from where the species probably originates) and has since been reported on several occasions in the Americas, Europe and Asia.

References
  1. Kergoat, Gael Joseph; Delobel, Pierre; Delobel, Alex (2007). "Phylogenetic relationships of a new species of seed-beetle infesting Cercis siliquastrum L. in China and in Europe (Coleoptera: Chrysomelidae: Bruchinae: Bruchini)". Annales de la Société Entomologique de France. 43 (3): 265–271. doi:10.1080/00379271.2007.10697522. ISSN 0037-9271.
  2. Gavrilović, Bojan; Savić, Dragiša (2013). "Invasive bruchid species Bruchidius siliquastri Delobel, 2007 and Megabruchidius tonkineus (Pic, 1914) (Insecta: Coleoptera: Chrysomelidae: Bruchinae) new in the fauna of Serbia – review of the distribution, biology and host plants". Acta Entomologica Serbica. 18 (1/2): 129–136.
  3. Barclay, Maxwell VL. "Bruchidius Siliquastri Delobel, 2007 (Chrysomelidae, Bruchinae) new to Britain." The Coleopterist 23 (2014): 41-44.

Further reading
  • Hizal, Erdem, and N. Nihan Parlak. "Bruchidius terrenus and Bruchidius siliquastri (Coleoptera: Chrysomelidae: Bruchinae)-first records for Turkey."Florida Entomologist 96.1 (2013): 66-70.
  • Stojanova, Anelia M., Zoltán György, and Zoltán László. "A new seed beetle species to the Bulgarian fauna: Bruchidius siliquastri, Delobel (Coleoptera: Chrysomelidae: Bruchinae)." Ecologia Balkanica 3.1 (2011): 117-119.
  • Yus Ramos, Rafael, et al. "Biological cycle of Bruchidius siliquastri Delobel, 2007 (Coleoptera: Bruchidae) on Cercis siliquastrum L. first record from peninsular Spain." Boletín de la SEA 45 (2009): 349-356.
  • Hoebeke, E. Richaed, et al. "First North American records of the east palearctic seed beetle Bruchidius terrenus (Coleoptera: Chrysomelidae: Bruchinae), a specialist on mimosa (Albizia julibrissin, Fabaceae)." Florida Entomologist 92.3 (2009): 434-440.
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