Dryocoetoides tuberculatus, Silva & Atkinson & Martínez & Cruz, 2020

Silva, Mauricio Pérez, Atkinson, Thomas H., Martínez, Armando Equihua & Cruz, Manuel Pérez De La, 2020, Description of new species of Ambrosiodmus Hopkins and Dryocoetoides Hopkins (Curculionidae: Scolytinae: Xyleborini) from Mexico, Zootaxa 4869 (3), pp. 444-450 : 447-448

Dryocoetoides tuberculatus new species Pérez & Atkinson

( Figs 9–12 )

Diagnosis. In Wood’s monograph (2007) this species would come out near D. truncatellus (Schedl) ( Figs 13–16 ) from which it differs by larger size, shining declivity, and more numerous, confused interstrial granules. In overall appearance it resembles D. rusticus Wood from which it differs by its smaller size, more slender body, steeper declivity with the second interstriae not impressed.

Female: Length 2.8–2.9 mm, elytra 1.65 mm, pronotum 1.26 mm long, 1.13 mm wide; body robust, color uniformly reddish brown.

Frons reticulate with abundant small granules to level of antennal insertion. Short, slender setae associated with granules; much longer setae along epistomal margin.

Antennal club flattened; anterior face with two procurved sutures visible; first two segments corneous, third pubescent; posterior face with two distally displaced sutures visible (type 3 of Hulcr et al., 2007). Funicle with five segments.

Pronotum slightly longer than wide; anterior margin rounded, armed with small teeth. Anterior area covered with abundant small asperities, becoming smaller and less abundant on posterolateral areas. Pronotal disc densely, shallowly punctured, with some small hair-like setae; surface finely reticulate.

Elytra parallel-sided to declivity; disc occupying 65% of total length. Striae not impressed, punctures uniseriate, moderately deep, each associated with a fine, recumbent seta. Interstriae three times as wide as striae, with confused punctures, becoming granulate posteriorly. Interstrial setae confused, longer posteriorly. Surface of disc slightly rugose horizontally.

Declivity convex, steep, occupying 35% of elytral length, surface shining. Striae slightly impressed, punctures and setae larger than on disc. Interstriae armed with numerous, confused granules, similar in size on all interstriae. Interstrial vestiture similar in size and abundance to that of disc. Posterolateral margin of declivity weakly elevated, subserrate.

Male: Unknown.

Type Material. Holotype: female, MÉXICO: Tabasco, Huimanguillo, km 29 Carr. Huimanguillo-Fco. Rueda, 29/III/2013, trampa de alcohol, M. Pérez De la Cruz ( CNIN). Paratypes (4). MÉXICO: Veracruz, Lázaro Cárdenas, Estación Biológica Los Tuxtlas, 18.5752°, -95.0928°, 11/IX/2019, Eugenia capulí (Myrtaceae) , T. H. Atkinson ( CEAM, 1; CIUT, 1; USNM, 1; UTIC, 1).

Biology. This species was collected in 4 cm diameter cut branches of Eugenia capuli in Los Tuxtlas. All specimens were collected from a single gallery system which had a single tunnel to the exterior opening into a flattened chamber between growth rings at a depth of 1 cm. Other species in this genus are polyphagous.

Hosts. Eugenia capulí (Myrtaceae) .

Etymology. The name reflects the large number of small tubercles completely covering the elytral declivity.

Figures

FIGURES 9–12. Female of Dryocoetoides tuberculatus, holotype. 10. Dorsal view; 11. Lateral view; 12. Elytral declivity; 13. frons. Photos by M. Pérez Silva. Specimen data: México: Tabasco, Huimanguillo, km 29 Carr. Huimanguillo-Fco. Rueda, 29/III/2013, alcohol trap, M. Pérez De la Cruz (CNIN).

FIGURES 13–16. Female of Dryocoetoides truncatellus. 14. Dorsal view; 15. Lateral view; 16. Elytral declivity; 17. frons. Photos by T.H. Atkinson. Specimen data: Brazil: Sergipe: Parque Nacional de Itabaiana, UV light trap, -10.76686o, -37.3402o, 7-X-2011, A.P. Costa (collection Universidade Estadual Paulista, Ilha Solteira, São Paulo, Brazil).