Scolytodes arcuatus Jordal and Smith

Jordal, Bjarte H. & Smith, Sarah M., 2020, Scolytodes Ferrari (Coleoptera, Scolytinae) from Ecuador: 40 new species, and a molecular phylogenetic guide to infer species differences, Zootaxa 4813 (1), pp. 1-67: 55

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Scolytodes arcuatus Jordal and Smith

sp. nov.

Scolytodes arcuatus Jordal and Smith   , sp. nov.

( Figs 118, 121, 124 View FIGURES 118–126 )

Type material. Holotype, female: Ecuador: Napo Prov., Res. Ethnica Waorani, 1km S Onkone Gare Camp., Trans. Et. , 00°39’10’’S, 76°26’W, 220m elev., July 1996, T.L. Erwin et al. collectors; indiv#000304. The holotype temporarily held in trust at USNM for MECN. GoogleMaps  

Diagnosis. Interstriae 10 sharply carinate to apex. Protibiae without additional mesal tooth, tooth 1 much larger than tooth 2. Lateral carinae on pronotum anteriorly continued as a sharp rim on the anterior margin. A pair of short, sharp carinae continue dorsad from epistoma to level of antennal insertion. Related to S. costabilis Wood, 1974   and S. validus Jordal and Smith   (described below), but distinguished from both by the greatly enlarged tooth 1 on the protibiae, the continuous rim near the anterior margin of the pronotum, and the glabrous elytra.

Description, female. Length 2.7 mm, 2.0 × as long as wide; colour dark brown. Head. Eyes entire, separated above approximately by 3 × their width (upper frons concealed by pronotum). Frons flattened and impressed between eyes to epistoma, a pair of narrow carinae running dorsad from epistoma to level of antennal insertion, smooth and impunctate between; vestiture consisting of long setae along outer margin of impressed area, curved upwards into a tip. Antennal club pilose, asymmetrically attached to funiculus, two procurved sutures, segment 1 and parts of segment 2 corneous. Funiculus 6-segmented. Pronotum reticulate, dull, punctures small, deep, spaced by 1–2 × their diameter, smaller punctures reaching anterior margin, with asperities on anterior half; anterior part of lateral carinae curved towards anterior margin, forming a sharp, continuous rim. Vestiture consisting of 4 long, erect setae (2-0-2). Elytra shiny, smooth; striae regular, lightly impressed, punctures large, deep, separated by 1–2 × their diameter; interstriae 3–4 × broader than striae, punctures one-third the size of strial punctures, confused, some places forming two irregular rows. Interstriae 10 sharply raised to apex. Glabrous. Legs. Procoxae separated by 0.4 × the width of one procoxa. Mesocoxae separated by 0.6 × the width of a procoxa. Protibiae narrow, distal teeth 1 greatly enlarged, twice as large as tooth 2, with 3–4 additional transverse rugae towards tibial base; protibial mucro long, curved posteriorly. Meso- and metatibiae with 8 and 7 socketed teeth on distal two-thirds. Ventral vestiture. Setae on mesanepisternum bifid, on metanepisternum and metasternum simple.

Male. Not known.

Key ( Wood 2007). Keys to couplet 19, S. costabilis   , but differs as noted in the diagnosis.

Etymology. The Latin name arcuatus   is a masculine participle, meaning curved, referring to the distinctly curved anterior part of the lateral carinae on the pronotum.

Biology and distribution. Only known from the type locality in the Ecuadorian Amazon. One specimen was collected by canopy fogging.


Smithsonian Institution, National Museum of Natural History


Museo Ecuadoriano de Ciencias Naturales