Euwallacea validus
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Euwallacea validus lateral; R.K. Osborn |
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Euwallacea validus dorsal; R.K. Osborn |
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Euwallacea validus declivity; R.K. Osborn |
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Euwallacea validus frontal; R.K. Osborn |
Taxonomic history
Xyleborus validus Eichhoff, 1876a: 202.
Euwallacea validus (Eichhoff): Wood and Bright, 1992: 694.
Diagnosis
3.9−4.1 mm long (mean = 4.0 mm; n = 5); 2.50−2.73 times as long as wide. This species is distinguished by the pronotumpronotum:
the dorsal surface of the thorax
appearing subquadratesubquadrate:
almost quadrate, with oblique corners
(type 3) from dorsaldorsal:
of or relating to the upper surface; opposite of ventral
view; outer margin of protibiaeprotibia:
tibia of the first pair of legs
round; declivital interstriaeinterstria:
longitudinal spaces along the elytra between the striae, which is not as<br />
impressed and bear smaller punctures.
1 granulategranulate:
pertaining to a coarse, grainy surface texture
; posterolateralposterolateral:
relating to end of the side part/portion
margin of declivitydeclivity:
downward slope of either the pronotum or elytra
carinate never granulategranulate:
pertaining to a coarse, grainy surface texture
; and moderately large size.
It can be further separated from the strongly morphologically similar species E. interjectus by the declivitydeclivity:
downward slope of either the pronotum or elytra
steeply sloped; declivitaldeclivital:
pertaining to the elytral declivity
strial punctures deep giving the declivitydeclivity:
downward slope of either the pronotum or elytra
a rugged appearance; and tuberclestubercle:
a small knob-like or rounded protuberance of the exoskeleton
mostly absent from the apicalapex:
point or edge furthest from the body; opposite of base
half of interstriaeinterstria:
longitudinal spaces along the elytra between the striae, which is not as<br />
impressed and bear smaller punctures.
2.
May be confused with
Euwallacea funereus, E. interjectus, and E. velatus
Distribution
China (Anhui, Chongqing, Fujian, Hubei, Yunnan), Japan, South Korea, Nepal, Taiwan, Vietnam; introduced and established in USA (Wood 1975, Cognato et al. 2015Cognato et al. 2015:
Cognato AI, Hoebeke ER, Kajimura H, Smith SM. 2015. History of the exotic ambrosia beetles Euwallacea interjectus and Euwallacea validus (Coleoptera: Curculionidae: Xyleborini) in the United States. Journal of Economic Entomology 108: 1129-1135. https://doi.org/10.1093/jee/tov073, Gomez et al. 2018aGomez et al. 2018a:
Gomez DF, Rabaglia RJ, Fairbanks KEO, Hulcr J. 2018a. North American Xyleborini north of Mexico: a review and key to genera and species (Coleoptera, Curculionidae, Scolytinae). ZooKeys 768: 19-68. https://doi.org/10.3897/zookeys.768.24697) and Europe (France) (Dodelin 2023Dodelin 2023:
Dodelin B (2023) Euwallacea validus (Eichhoff, 1876) nouveau scolyte pour l’Europe. https://entomodata.wordpress.com/2023/11/30/euwallacea-validus-eichhoff-1876-nouveau-scolyte-pour-leurope/)
Host plants
polyphagous, attacking both gymnosperm and angiosperm trees (Wood and Bright 1992Wood and Bright 1992:
Wood SL, Bright DE. 1992. A catalog of Scolytidae and Platypodidae (Coleoptera), Part 2: Taxonomic index. The Great Basin Naturalist Memoirs 13: 1-1533.)
DNA data
Sequences available for COI and CAD.
Additional COI sequences from across Asian and North Ameircan populations are given in Cognato et al. 2015Cognato et al. 2015:
Cognato AI, Hoebeke ER, Kajimura H, Smith SM. 2015. History of the exotic ambrosia beetles Euwallacea interjectus and Euwallacea validus (Coleoptera: Curculionidae: Xyleborini) in the United States. Journal of Economic Entomology 108: 1129-1135. https://doi.org/10.1093/jee/tov073.
