Acanthotomicus diaboliculus Cognato and Smith, 2020

Cognato, Anthony I. & Smith, Sarah M., 2020, Acanthotomicus diaboliculus and A. enzoi (Coleoptera: Curculionidae: Scolytinae: Ipini), New Species from Southeast Asia, The Coleopterists Bulletin 74 (3), pp. 538-541 : 539

Acanthotomicus diaboliculus Cognato and Smith , new species

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( Figs. 1–5 )

Diagnosis (Male). Spines on declivital interstriae 1 and 3–9, including larger spines on 3, 7 and 9 distinguishes A. diaboliculus from A. enzoi , which has spines on 2–6 and 9 with larger spines on 4 and 9, and from A. spinosus , which has spines on 2–9 with larger spines on 4–6.

Description. Holotype, male, total mean length 2.33 mm ( paratypes 2.3–2.5 mm, n = 3), 3.33× as long as wide; antennae, head, legs, thorax, and elytra reddish-brown ( Figs. 1–4 ). Head. Epistomal setae present. Frons slightly convex, granulate, scattered punctures; scattered frontal tubercles approximately mid-frons, one larger median tubercle ( Fig. 3 ). Scape longer than funicle; five funicular antennomeres including pedicel; antennal club flattened, longer than wide, with sensillae on anterior face, partitioned by two procurved sutures. Pronotum. Mean width 0.73 mm ( 0.7–0.8 mm, n = 3), 1.23× as long as wide; summit approximately on anterior third, scalpriform rugosities with interspersed setae on anterior half; posterior half of disc shining, shallowly, minutely punctate, with scattered erect hair-like setae; base transverse, curved laterally ( Figs. 1, 2 ). Scutellar shield. Triangular, flush with elytra ( Fig. 1 ). Elytra. Together 1.75× as long as wide, 1.56× longer than pronotum. Elytral base transverse. Discal strial punctures uniseriate, nearly contiguous, shallowly impressed, 1.5× width of interstriae; interstrial setae uniseriate, 1–1.5× width of interstria ( Fig. 2 ). Declivital margin of each elytron with four smaller and three larger subequal acute spines, the smallest as long as two strial punctures and the largest at least as long as three strial punctures; small first spine on interstria 1; large second spine on interstria 3; small third spine on interstria 4; small fourth spine on interstria 5; small fifth spine on interstria 6; large sixth spine on interstria 7; small seventh spine on interstria 8; large eighth spine on interstria 9 and comprising the apex of the declivity; apical third of interstriae 5–9 granulate/tuberculate ( Figs. 1, 2, 4 ). Declivital face with striae 1 and 2 curving laterally, declivital suture setose.

Female. Similar to male in most features except frons concave, glabrous, without median large granule; elytral spines and tubercles reduced in size ( Fig. 5 ).

Type Material. Holotype: male, “ THAI [LAND]: [ Chaiyaphum Province] Phu Khieo N[ational] P[ark] [Wildlife Sanctuary] , vii 2005, Hulcr et al. coll; Aca.spTH32, DNA Ex[tract]” ( MSUC) . Paratypes ( 3): “ THAILAND: Chaiyaphum: [Province] Phu Khieo Wildl.[ife] Res.[ervation] , 8. vii. 2005, Hulcr et al. coll; THA099 : T32” ( MSUC, 1 male) . CHINA: Yunnan, Lijiang, host: Quercus acutissima 1962.VI.2 (label translated by Dr. You Li) ( NMNH, 1 male, 1 female) .

Etymology. Latin diabolus = devil, -iculus = little. A noun in apposition.

Hosts. This species is known from Quercus (Fagaceae) .

Notes. Holotype dissected for DNA extraction; head, pronotum, and remaining body separated and glued to a paper point and pinned. Genbank accession numbers—COI: KF862797 , 16S: KF862718 , 28S: KF862750 , CAD: KF862833 ( Cognato 2013).

Figures

Figs. 1–9. Acanthotomicus diaboliculus, new species, paratype male: 1) Dorsal view; 2) Lateral view; 3) Anterior view; 4) Elytral declivity. 5) Female, elytral declivity. Acanthotomicus enzoi, new species, holotype male: 6) Dorsal view; 7) Lateral view; 8) Anterior view; 9) Elytral declivity.