Conexicoxa, Lin, 1986

Strelnikova, O. D. & Yan, E. V., 2023, ON SPLITTING OF THE GENUS NOTOCUPES (COLEOPTERA: ARCHOSTEMATA): NEW DATA ON MORPHOLOGY AND TAXONOMY, Far Eastern Entomologist 488, pp. 1-28 : 16-18

Key to species of the genus Conexicoxa

(С. crassa and С. jurassica were excluded from the identification key due to insufficient information about their diagnostic characters)

1. Beetles with narrow body and narrow pronotum (body length to width ratio 2.7–2.9; pronotum width to length ratio 1.3–1.6) ……………………………….….........…………... 2

– Beetles with wide body and pronotum (body length to width ratio 1.7–2.1, pronotum width to length ratio 1.7–2.2) ...………………………………………………..….…………… 6

2. Abdomen narrowing apically starting from the 3rd sternite, apical sternite 2–2.7 times longer than penultimate one; elytral cells usually of medium-size, cells occupy half distance or more between the veins and clearly do not reach the fields edges ( Fig. 49 ), number of elytral cells in one row differs.………………..................……………….……………... 3

– Abdomen narrowing apically starting from the 4th or the 5th sternite, apical sternite 2.6– 2.9 times longer than penultimate one; elytral cells large, occupy more than half the distance between the vein and almost reach the fields edges ( Figs 48, 50 ), often located close to fields sides; usually 26 cells per one elytral row ...…………….…………….…. 5

3. Apical abdominal sternite 2–2.2 times longer than penultimate one ......….… С. kirghizica

– Apical abdominal sternite 2.5–2.7 times longer than penultimate one ...……..………….... 4

4. Apical abdominal sternite 2.5 times longer than penultimate one, abdominal apex blunt.… ………………………………………………………………………...……….. С. homora

– Apical abdominal sternite 2.7 times longer than penultimate one, abdominal apex acute ... ..……………………………………………………………………….……… С. tripartita

5. Head 2.8 times narrower than pronotum. Body covered with small tubercles, not larger than 0.02 mm in diameter, density is 980 tb/mm 2. Elytral length to width ratio 2.8–3.1. Abdomen narrowing posteriorly from the base of the 4th sternite, apical sternite`s width to length ratio 2.1 ....……………………………………….…………………… С. exigua

– Head 2.3 times narrower than pronotum. Body covered with medium-sized tubercles from 0.02 mm to 0.04 in diameter, density is 720 tb/mm 2. Elytral length to width ratio 4. Abdomen narrowing posteriorly from the base of the 5th sternite, apical sternite`s width equal to length ( Fig. 58 ) .........………………………………………….………… С. longicollis

6. Head narrowing only anteriorly. Elytron 1.4–1.6 times wider than pronotum.…….…..… 7

– Head not narrowing (except С. psilata ). Elytron may be wider than pronotum by more than 1.6 ……………………………………………………………………………….……... 11

7. Body wide, pronotum and elytron both wide ( Fig. 1 ), body length to width ratio 1.7. Elytron not less than 1.6 times wider than pronotum ………………...... С. brachicephala

– Beetle with narrower body, body length to width ratio 2–2.2. Elytron no more than 1.6 times wider than pronotum …………….……………………………………….…….…. 8

8. Epipleuron narrow, 9 times narrower than elytron. Abdominal apical sternite 3 times longer than penultimate one …............…………………………………………….…. С. siniestri

– Epipleuron wide, 5–6 times narrower than elytron. Abdominal apical sternite 2.1–2.5 times longer than penultimate one.……………………………………………………………. 9

9. Pronotum and elytron strongly dentate laterally; about 21 cells in elytral row ……………. ………………………………………………………………………………. C. denticollis

– Pronotum and elytron laterally do not dentate, no less than 25 elytral cells in one row .... 10

10. In one elytral row 25 cells ………………………………………….……. С. martinclosas

– In one elytral row 30 cells ………………………………………….…...….. С. khetanensis

11. Body elongated, length to width ratio 2.1, pronotal width to length ratio 1.7 ( Fig. 6 ) ...… ………………………………………………………………….……………. С. epicharis

– Body is wider, length to width ratio 1.8, pronotal width to length ratio 1.9–2.2.……..… 12

12. Body length to width ratio 2, 28 cells in one elytral row.………………..….… С. stabilis

– Body length to width ratio 1.8, 25–26 cells in one elytral row …………………..……… 13

13. Elytral cells without maculae. Apical abdominal sternite 3 times longer than penultimate one.…………………………………………………………………….……….. С. psilatа

– Elytral cells with 3–4 maculae. Apical abdominal sternite 3.5–4 times longer than penultimate one ..…………………………………………………………………….… 14

14. Apical abdominal sternite 3.5 times longer than penultimate one ..... ..……… С. porrecta

– Apical abdominal sternite 4 times longer than penultimate one.….…………... С. eumeura

Figures

Figs 48–52. Form and size of elytral cells. 48 – large round cells of Rhabdocupes vitimensis; 49 – medium-sized ovate cells of Conexicoxa kirghizica; 50 – square large cells of Notocupes excellens; 51 – multifaceted small cells of Notocupes dundulaensis; 52 – small ovate cells with pronounced intercalary of Rhabdocupes tenuis.

Figs 57–60. Abdomen morphology. 57 – Rhabdocupes rostratus; 58 – Conexicoxa longicollis; 59 – Brachilatus caducus; 60 – Notocupes lapidarius. Scale bar = 1 mm.

Figs 1–4. Types of elytral venation. 1 – Conexicoxa brachicephala (Ponomarenko, 1994); 2 – schematic drawing of Zygadenia spp.; 3 – Z. liui Jarzembowski et al., 2015; 4 – Z. westraliensis (Riek, 1968). (Figs 1, 2, 4 – redrawing with changes from Ponomarenko, 1994, 2006; Martin, 2010). Scale bar = 1.

Figs 5–8. Representatives of the four investigated genera. 5 – Rhabdocupes protensus (Tan et al., 2006); 6 – Conexicoxa epicharis (Tan, Ren et Liu, 2005); 7 – Notocupes picturatus Ponomarenko, 1964; 8 – Brachilatus longicoxa (Soriano et Martinez-Delclòs, 2006). Scale bar = 1 mm.