Thisiomorphus

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 : 305

Key to species of Thisiomorphus

1 Body distinctly and convexly ovate ( Fig. 8 ), tricolored: forebody with green metallic reflection, elytra rufo-testaceous with metallic blue apices........................................................................ T. festivus n. sp.

- Body more elongate and/or parallel-sided; elytra uniform in color, or at least without transversely marked color difference…2

2 Pronotum distinctly lighter in color than elytra ( Figs 1–2, 6 , 9–11 )............................................... 3

- Dorsum of more uniform dorsal color, without distinct contrast between pronotum and elytra......................... 8

3 Elytra with distinct green/blue metallic sheen............................................................... 4

- Elytra without metallic sheen............................................................................ 7

4 Head and scutellum dark piceous, same color as elytra; frontal grooves deeply impressed, subparallel ( Fig. 6 )................................................................................................... T. davidsoni n. sp.

- Head and scutellum rufous, much lighter in color than elytra ( Figs 2 , 9–10 ); frontal grooves less deeply impressed, and/or convergent anteriorly..................................................................................... 5

5 Pronotum distinctly wider than long (GPW / PL = 1.61–1.66)................................................... 6

- Pronotum slightly wider than long (GPW / PL = 1.27).......................................... T. inaequalis n. sp.

6 Maximum width of pronotum anterad midlength, sides divergent anteriorly; elytra subparallel-sided; head relatively wide, GPW/GHW = 1.16; size smaller, TL = 5.0 mm; known from Brazil...................................... T. latus Pic

- Maximum width of pronotum at hind angles, sides convergent anteriorly; elytra distinctly ovate; head relatively narrow, GPW/ GHW = 1.35–1.43; size larger, TL = 6.7–7.9 mm; known from Bolivia............................. T. bolivianus n. sp.

7 Head and elytra piceous; pronotum and legs reddish; elytra smooth, without indications of longitudinal carinae; dorsal vestiture of uniform color...................................................................... T. andrewsi n. sp.

- Head piceous posteriorly, anteriorly yellow; elytra piceous; pronotum yellow except for posterior margin piceous; legs yellow and piceous; elytra with indications of longitudinal carinae; dorsal vestiture lighter in color along elytral suture ( Fig. 11 )............................................................................................ T. osaensis n. sp.

8 Lateral margins of pronotum parallel-sided, posterolateral angles distinct ( Fig. 12 ); pronotum relatively long (GPW/PL 1.18– 1.30), not distinctly wider than head (GPW/GHW 0.87–1.08); known from Costa Rica and Panama.......... T. solisi n. sp.

- Lateral margins of pronotum slightly arcuate, divergent anteriorly, or distinctly convergent anteriorly; pronotum relatively wider (GPW/PL 1.30–1.65)............................................................................. 9

9 Dorsum, especially elytra, with at least a trace of blue to purple metallic sheen.................................... 10

- Dorsum without blue to purple metallic lustre.............................................................. 11

10 Pronotum very wide (GPW/PL 1.65), lateral margins relatively straight, distinctly convergent anteriorly ( Fig. 5 ); GPW/GHW 1.27; known from Brazil................................................................. T. convergens n. sp.

- Pronotum narrower (GPW/PL 1.30–1.43), lateral margins evenly arcuate, greatest width near midlength ( Fig. 4 ); GPW/GHW 1.08–1.15; known from Costa Rica and Panama............................................... T. caeruleus n. sp.

11 Lateral margins of pronotum arcuate, greatest width at about midlength; pronotal disc with pair of distinct, slightly oblique depressions; antennae relatively long, antennomeres distinctly filiform; known from Brazil............ T. brasiliensis n. sp.

- Lateral margins of pronotum relatively straight, slightly convergent anteriorly, greatest width posterior of midlength; pronotal disc without distinct, paired depressions; antennae short, antennomeres almost submoniliform; known from Ecuador............................................................................................. T. curticornis n. sp.

Figures

FIGURES 7 – 12. Dorsal habitus of Thisiomorphus species. 7. T. curticornis, n. sp., male holotype; 8. T. festivus, n. sp., male holotype; 9. T. inaequalis, n. sp., male holotype; 10. T. latus Pic, holotype; 11. T. osaensis, n. sp., female; 12. T. solisi, n. sp., male holotype.

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.