Coptoborus tristiculus (Wood, 1975) Smith & Cognato, 2021

Smith, Sarah M. & Cognato, Anthony I., 2021, A revision of the Neotropical genus Coptoborus Hopkins (Coleoptera, Curculionidae, Scolytinae, Xyleborini), ZooKeys 1044, pp. 609-720 : 609

Coptoborus tristiculus (Wood, 1975) comb. nov. Figure 18A-C, M

Xyleborus tristiculus Wood, 1975b: 401.

Type material.

Holotype (NHMUK), examined.

New records.

Ecuador: Napo Prov. [= Orellana Prov.], Res[erva]. Ethnica Waorani, 1 km S. Okone Gare Camp, Trans[ect]. Ent[omology]., 00°39'10"S, 076°26'W, 220 m, October 1996, T.L. Erwin et al. collectors, insecticidal fogging, terra firme forest, trans[ect] 7, sta[tion] 8, Erwin lot #1728 (ICB, 1); as previous except: October 1995, trans[ect] 2, sta[tion] 10, Erwin lot #1190 (ICB, 1); as previous except: January 1996, trans[ect] 7, sta[tion] 7, Erwin lot #1467 (NMNH, 1).

Diagnosis.

2.2-2.3 mm (mean = 2.23 mm; n = 2), 2.2-2.3 × as long as wide. This species is distinguished by the elytral apex broadly rounded and entire, posterolateral margin continuously and smoothly carinate to striae 6 and not extended posteriad, declivital interstrial setae fine, hair-like, longer than the width of interstriae 2 and abundantly covering declivity, declivital interstriae granulate, granules large and distinct, declivital striae 1 and 2 distinctly impressed.

Similar species.

C. brigman , C. leia , Euwallacea perbrevis .

Distribution.

Brazil (Mato Grosso), Ecuador* (Orellana).

Biology.

The type series were collected by Roger Beaver in Brazil. The type series have field notebook codes C47, D-35, Nos. 170, 172, No. E-18 on their locality labels ( Wood 1975b). These specimens were collected from two small cut trees of Protium ( Burseraceae ) with stem diameters between 3.5-4.5 cm. Two gallery systems were investigated and branched rather irregularly in the transverse plane of the wood, penetrating ~2 cm deep, and were without enlargements or brood chambers (R.A. Beaver, pers. comm., 11 November 2020). Specimens were also collected by canopy fogging.

Remarks.

This species was omitted from Wood (2007). In his description Wood (1975b) allied this species to Xyleborus molestulus which he later placed in Theoborus ( Wood and Bright 1992: 661) but which has recently been recognized as a synonym of Euwallacea perbrevis (Schedl, 1951) ( Smith et al. 2020). This species shares the diagnostic characteristics of Coptoborus and is here transferred.

Figures

Figure 18. Dorsal, lateral, frontal and declivital view of Coptoborus tristiculus 2.2 - 2.3 mm (A-C, M), C. uhura holotype, 2.0 mm (D-F, N), C. vasquez holotype, 2.4 mm (G-I, O), C. vespatorius, 2.55 - 2.8 mm (J-L, P). All photographs by SMS.