Xyloterini LeConte, 1876

Johnson, Andrew J., Hulcr, Jiri, Knížek, Miloš, Atkinson, Thomas H., Mandelshtam, Michail Yu., Smith, Sarah M., Cognato, Anthony I., Park, Sangwook, Li, You & Jordal, Bjarte H., 2020, Revision of the Bark Beetle Genera Within the Former Cryphalini (Curculionidae: Scolytinae), Insect Systematics and Diversity 4 (3), No. 1, pp. 1-81 : 44

Xyloterini LeConte, 1876

=Xyloteri LeConte, 1876: 356.

=Xyloteroideae Lindemann, 1877: 165.

=Xyloteridae Eichhoff, 1878b: 411.

=Trypodendrinae Trédl, 1907: 70 (Unavailable name).

=Xyloterinae Nüsslin, 1911a: 432.

= Xyloterini Reitter, 1913: 28 .

=Xyloterina Balachowsky, 1949: 196.

=Trypodendrina Nunberg, 1954: 16.

=Trypodendrini Browne, 1961: 45.

=Trypodendroninae Wood, 1978: 114.

Type of tribe

Xyloterus Erichson, 1836 .

Diagnosis

Eye divided. Mycangia present on females.

Female

Female: Frons typically convex. Eye completely divided. Antennae with five funicle segments. Pronotum in dorsal view broadly rounded anteriorly, mostly with marginal asperities. Lateral margins of pronotum rounded. Vestiture typically with only hair-like setae. All tarsal segments cylindrical. Tibiae flattened with socketed denticles extending over at least apical quarter. A fungus-carrying organ (mycangium) visible as a setose opening on the latero-ventral side of the prothorax on the hypomeron.

Male

Similar to female in most characters, but pronotum in dorsal view quadrate and in Trypodendron , frons typically concave. Penis apodemes of a similar length or longer than penis body, separated at apex. Tegmen with a median apodeme or no apodemes, open dorsally. Spiculum gastrale reduced, much thinner than the thickness of penis apodemes. Basal sclerites complex and developed. Males of Xyloterinus politus are reportedly flightless and do not leave the natal gallery.

Distribution

Holarctic and Southeast Asia.

Remarks

All thorough molecular studies to date have indicated a strongly supported nested position among several former Cryphalini genera, sister to Coriacephilus or Cryphalus . We note that Indocryphalus

may be paraphyletic based on the two taxa included in some molecular studies and with morphology ( Cognato et al. 2015).

Included genera

Indocryphalus Eggers, 1939 ; Trypodendron Stephens, 1830 ; Xyloterinus Swaine, 1918 .