Thisiomorphus davidsoni, Pollock, Darren A., 2016

Pollock, Darren A., 2016, Revision of Thisiomorphus Pic (Coleoptera: Mycteridae: Eurypinae) with descriptions of eleven new species from Central and South America and a key to genera of Neotropical Eurypinae, Zootaxa 4093 (3), pp. 301-322 : 315

Thisiomorphus davidsoni , new species

( Figs 6 , 34)

Holotype, female, labeled: “Chapada Brazil [-15.460833, -55.75] Acc. No. 2966 // Oct. // [large red label] HOLOTYPE Thisiomorphus davidsoni Pollock ”, in CMNH.

Paratype, female, labeled: Chapada Brazil Acc. No. 2966 // Nov.”, in CMNH.

Derivation of specific epithet. I am pleased to name this new species in honor of Robert (“Bob not Todd”) Davidson, curator of Coleoptera at Carnegie Museum of Natural History, a colleague and good friend.

Diagnosis. Specimens of T. davidsoni are somewhat similar in color to those of T. inaequalis . The former is the only species of Thisiomorphus with reddish pronotum, and distinctly darker (piceous) antennae, head and elytra. By contrast, adults of T. inaequalis possess a reddish head and scutellum contrasting dark antennae and elytra.

Description. Measurements (mm): HL = 1.00; PL = 2.8–3.1; EL = 4.00–4.60; GHW = 1.36–1.40; GPW = 1.52–1.64; GEW = 2.48–2.68; TL = 6.12–6.84. Ratios: EL/GEW = 1.61–1.72; GPW/PL = 1.32–1.36; TL/GEW = 2.47–2.55; GPW/GHW = 1.12–1.17. With characters of Thisiomorphus , and the following:

Body elongate (TL/GEW 2.51), lateral elytral margins subparallel to slightly arcuate.

Color. Antennae uniformly rufo-piceous; maxillary palpi rufous, with distinctly darker piceous distal palpomere; head uniformly dark piceous to near black; pronotum and scutellum rufous; elytra dark piceous with faint bluish metallic lustre; legs and venter piceous, prothorax distinctly lighter, rufous.

Antennae relatively short; antennomeres 3–7 subfiliform; antennomeres 8–10 short, indistinctly widened distally.

Pronotum moderately wider than long (GPW/PL 1.34), slightly wider than head (GPW/GHW 1.15); lateral margins relatively straight, sides subparallel; dorsal surface evenly convex, without depressions.

Male genitalia unknown.

Distribution. The two known specimens are from BRAZIL (Mato Grosso). The locality “Chapada” is interpreted here as “Chapada dos Guimarães” (Davidson, pers. comm.; for more information on this locality and the insect collections from there, see Kunzler et al. 2011).

Figures

FIGURES 1 – 6. Dorsal habitus of Thisiomorphus species. 1. T. andrewsi, n. sp., male holotype; 2. T. bolivianus, n. sp., female holotype; 3. T. brasiliensis, n. sp., male holotype; 4. T. caeruleus, n. sp., female; 5. T. convergens, n. sp., female holotype; 6. T. davidsoni, n. sp., female holotype.