Cyclorhipidion distinguendum
Cyclorhipidion distinguendum lateral; R.K. Osborn |
Cyclorhipidion distinguendum dorsal; R.K. Osborn |
Cyclorhipidion distinguendum declivity; R.K. Osborn |
Cyclorhipidion distinguendum declivity; R.K. Osborn |
Cyclorhipidion distinguendum frontal; R.K. Osborn |
Taxonomic history
Xyleborus distinguendus Eggers, 1930: 205.
Cyclorhipidion distinguendum (Eggers): Maiti and Saha 2004: 105.
Synonyms
Xyleborus fukiensis Eggers, 1941b: 225. Smith et al. 2020b: 186.
Xyleborus ganshoensis Murayama, 1952: 16. Smith et al. 2020b: 186.
Diagnosis
2.5−3.11 mm long (mean = 2.78 mm; n = 15); 2.6−3.0 times as long as wide. This species is distinguished by the short, steep declivitydeclivity:
downward slope of either the pronotum or elytra
that is approximately 25% of total elytralelytral:
pertaining to the elytra
length, armed with large tuberclestubercle:
a small knob-like or rounded protuberance of the exoskeleton
on interstriaeinterstria:
longitudinal spaces along the elytra between the striae, which is not as<br />
impressed and bear smaller punctures.
1 and 3, interstriaeinterstria:
longitudinal spaces along the elytra between the striae, which is not as<br />
impressed and bear smaller punctures.
2 always unarmed; posterolateralposterolateral:
relating to end of the side part/portion
margins rounded; and declivitaldeclivital:
pertaining to the elytral declivity
interstriae 1 setaeseta:
small hair-like or scale-like structure
in 3 confusedconfused:
of markings, having indefinite outlines or running together as lines or spots without definite pattern; usually referring to punctures
rows and interstriaeinterstria:
longitudinal spaces along the elytra between the striae, which is not as<br />
impressed and bear smaller punctures.
2 setaeseta:
small hair-like or scale-like structure
in 2 confusedconfused:
of markings, having indefinite outlines or running together as lines or spots without definite pattern; usually referring to punctures
rows.
May be confused with
This species most closely resembles C. pelliculosum and C. triste.
This species is a part of the challenging C. pelliculosum= species group. Species in the group are most easily distinguished by the rows of setaeseta:
small hair-like or scale-like structure
along declivitaldeclivital:
pertaining to the elytral declivity
interstriae 1and 2. See table below:
species |
declivital declivital: |
declivital declivital: |
total body length (mm) |
total body length/width ratio |
lateral lateral: |
interstriae 2 granules |
interstriae 1 & 3 granules |
C. achlys Smith, Beaver, and Cognato, 2022 |
3 |
1 |
3.4 |
3.09 |
steeply rounded |
absent |
present |
C. beaveri Lin and Smith, 2022 |
1 |
1 |
1.68−1.85 |
2.91−3.05 |
steeply rounded |
present |
present |
2 |
1 |
1.6−2.4 |
2.5−3.29 |
steeply rounded |
absent |
present |
|
2 |
2 |
2.2 |
3.14 |
steeply rounded |
absent |
present |
|
C. cognatoi Lin and Smith, 2022 |
2 |
1 |
2.95−3.28 |
2.82−2.93 |
steeply rounded |
absent |
present |
C. distinguendum |
3 |
2 |
2.5−3.11 |
2.6−3.0 |
steeply rounded |
absent |
present |
2 |
1 |
2.75−3.0 |
2.75−3.0 |
steeply rounded |
absent |
present |
|
1 |
1 |
2−2.2 |
2.75−3.07 |
steeply rounded |
absent |
present |
|
3 |
1 |
3.2−3.5 |
2.67−3.0 |
steeply rounded |
rare, on basalbase: |
present |
|
C. taedulum Smith, Beaver, and Cognato, 2022 |
2 |
1 |
2.7 |
3 |
steeply rounded |
absent |
present |
2 |
2 |
2.7−3.0 |
2.5−3.0 |
steeply rounded |
Often on apicalapex: |
present |
|
2 |
1 |
2.92−3.47 |
2.78 |
steeply rounded |
absent |
absent |
|
1 |
1 |
1.65−1.8 |
3.09−3.4 |
obliquely truncateobliquely truncate: |
absent |
present |
Distribution
China (Beijing, Fujian, Hong Kong, Jiangxi, Yunnan), India (Uttarakhand), Japan, South Korea, Nepal, Taiwan, Thailand, Vietnam. Recently established in the United States (Hoebeke et al. 2018Hoebeke et al. 2018:
Hoebeke ER, Rabaglia RJ, Kniacute;žek M, Weaver JS. 2018. First records of Cyclorhipidion fukiense (Eggers) (Coleoptera: Curculionidae: Scolytinae: Xyleborini), an ambrosia beetle native to Asia, in North America. Zootaxa 4394: 243-250. https://doi.org/10.11646/zootaxa.4394.2.7; Smith and Cognato 2022Smith and Cognato 2022:
Smith SM, Cognato AI. 2022. New exotic beetles found in the United States among pseudocryptic Cyclorhipidion species (Coleoptera: Curculionidae: Scolytinae: Xyleborini) revealed via a multigene phylogeny. Insect Systematics and Diversity Insect Systematics and Diversity 6(4), 2. https://doi.org/10.1093/isd/ixac014) and France (Dodelin 2018Dodelin 2018:
Dodelin B. 2018. Espegrave;ce invasive nouveau pour la faune de France Scolyte Cyclorhipidion fukiense installeacute; en Europe. https://entomodata.wordpress.com/2018/04/24/cyclorhipidion-fukiense-installe-en-europe/) as C. fukiense.
Host plants
recorded from Castanea, Cyclobalanopsis, Lithocarpus, and Quercus (Fagaceae), and probably with a close association with Fagaceae (Beaver et al. 2014)
DNA data
Sequences available for COI and CAD.
COI: MN199576; MN199577; MN619886; MN619887; MN199578; MN619888; MN619889; MN619890; OM867005; OM867000
CAD: MN620171; MN620172; MN620173; MN620174; MN199595; MN199593; MN199594; OM891125; OM891120