Xyleborinus exiguus
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Xyleborinus exiguus lateral; R.K. Osborn |
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Xyleborinus exiguus dorsal; R.K. Osborn |
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Xyleborinus exiguus declivity; R.K. Osborn |
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Xyleborinus exiguus frontal; R.K. Osborn |
Taxonomic history
Bostrichus exiguus Walker, 1859: 260.
Xyleborinus exiguus (Walker): Maiti and Saha, 1986: 109.
Synonyms
Xyleborus muriceus Eichhoff, 1878a: 392. Eggers, 1925: 154.
Xyleborus diversus Schedl, 1954b: 80. Smith et al. 2020b: 345.
Xyleborus perexiguus Schedl, 1971b: 381. Hulcr and Cognato, 2013: 142.
Xyleborus ankius Schedl, 1975c: 361. Hulcr and Cognato, 2013: 142.
Diagnosis
1.8−2.0 mm long (mean = 1.88 mm; n = 5); 2.57−3.0 times as long as wide. This species is distinguished by the declivitaldeclivital:
pertaining to the elytral declivity
face with interstriaeinterstria:
longitudinal spaces along the elytra between the striae, which is not as<br />
impressed and bear smaller punctures.
2 unarmed by tubercles; elytralelytral:
pertaining to the elytra
apexapex:
point or edge furthest from the body; opposite of base
attenuate, with three (usually) pairs of large flattened tubercles; and declivitaldeclivital:
pertaining to the elytral declivity
interstriae flat, interstriaeinterstria:
longitudinal spaces along the elytra between the striae, which is not as<br />
impressed and bear smaller punctures.
2 not impressedimpressed:
a depression in a surface
.
May be confused with
Xyleborinus huifenyinae, X. perpusillus, and X. tritus
Distribution
recorded in the study region from India (Andaman Is.), Cambodia, China (Jiangxi, Yunnan), Laos, Myanmar, Nepal, Taiwan, Thailand, Vietnam; also recorded from Australia, Cook Is., Federated States of Micronesia, Fiji, Guam, Indonesia (Java, Maluku, Sulawesi, Sumatra), East & West Malaysia, Mariana Is., New Guinea, Niue I., Philippines, Samoa, Solomon Is., Tahiti; introduced to West Africa (Angola, Congo, Equatorial Guinea, Gabon, Ghana, Ivory Coast) (Beaver 2005Beaver 2005:
Beaver RA. 2005. A remarkable new species of Cyclorhipidion Hagedorn, and new records of bark and ambrosia beetles from Gabon (Coleoptera: Curculionidae, Scolytinae and Platypodinae). The Entomologistrsquo;s Monthly Magazine 141: 113-119., Wood and Bright 1992), Central America (Costa Rica, Panama) (Kirkendall and Ødegaard 2007) and recently established in Hawaii (Cognato et al. in press).
Host plants
polyphagous (Browne 1961bBrowne 1961b:
Browne FG. 1961b. The biology of Malayan Scolytidae and Platypodidae. Malayan Forest Records 22: 1-255.)
Remarks
Kalshoven (1959b) gives details of brood sizes in various hosts in relation to the size of the brood chamber.
DNA data
Sequences available for COI and CAD.
