Leiodidae, Fleming, 1821

Švec, Zdeněk, 2022, Leiodidae (Coleoptera) of the Hainan Island with new faunistic records from China and with notes on the unique body modifications in the genus Agathidium, Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 62 (1), pp. 155-164 : 156-157

Key to the Leiodidae of Hainan Island

1 Antennal insertion not visible in dorsal view. Head without any occipital carina or elevated crest ( Leiodinae ). Anterior tibia without or at most with several feeble spines on its lateral and/or apical margin ( Pseudoliodini , Agathidiini ). ............................................... 2

– Antennal insertion visible in dorsal view. Head with distinct occipital strongly elevated carina or elevated crest ( Cholevinae ).Anterior tibiae with closely set row of flat wide spines laterally and also with some thorns ventrally (Ptomaphaginini). Pronotum transversally strigose ( Ptomaphaginus Portevin, 1914 ) ................. 5

2(1) Tibiae oval or a little depressed dorso-ventrally, not angular in cross-section, without any longitudinal carinas ( Pseudoliodini ). Mesoventrite excavate between longitudinal carina and procoxal rest ( Dermatohomoeus Hlisnikovský, 1963 ). Elytra densely irregularly punctured with exception of traces of two punctured double rows near suture. Ventral plates of tegmen exceed top of parameres, terminating in long butterfly wing-shaped process ( Fig. 19 ). Body length 2.1–2.4 mm. ............................................ D. pennatus sp. nov.

– At least pro- and mesotibiae angular in cross-section bearing usually two low longitudinal carinae or ribs, each equipped with row of short stiff setae all along their length ( Agathidiini ). Posterior pronotal angles not developed, base continues to lateral margin in fluent arc in lateral view. Beetles are capable of partial to complete conglobation ( Agathidium Panzer, 1797 ). ................... 3

3(2) Metaventrite strongly shortened, without femoral lines (subg. Macroceble ). Sutural striae not developed. Dorsum without microsculpture. Lateral outline of pronotum broadly rounded in lateral view (as in Figs 5 , 11 ). ............................................................. 4

– Metaventrite not shortened; with femoral lines (subg. Agathidium s. str.). Dorsum without microsculpture. Supraocular carina distinctly raised anteriorly near clypeus. Lateral outline of pronotum with shortly rounded angle in lateral view ( Fig. 3 ). Sutural striae not developed. Aedeagus of type C, apex of tegmen resembles skittle pin in dorsal view ( Fig. 2 ). Spermatheca with pear-shaped basal part and simply bowed distal thin part ( Fig. 4 ). Body length 1.8–2.0 mm. ..... ............................................ A. (A.) pilulum sp. nov.

4(3) Dorsal surface unobtrusively, very feebly sparsely and finely punctured, punctures separated by 8–10 or more times their diameter. Longitudinal mesoventral carina and lateral lines not developed. Aedeagus of type A with short basal part, tegmen terminates apically with long rounded process ( Fig. 7 ). Spermatheca slim, cylindrical, S-shaped ( Fig. 8 ). Body length 1.6–1.9 mm. ................................. A. (Macr.) cornigerum sp. nov.

– Dorsal surface distinctly moderately densely punctured, punctures separated by about 4–6 times their diameter. Longitudinal mesoventral carina and lateral lines developed. Aedeagus of type A with elongate basal part, tegmen truncate apically with lateral plate on each side ( Figs 9, 10 ). Body length 2.3 mm. ............... ..................................... A. (Macr.) apiforme sp. nov.

5(1) Pronotal strigosity denser than that on elytra. Elytral apex with bush of strong setae. Aedeagus pyriform in dorsal view. Body length 2.6 mm. ................................ ...................... P. wuzhishanicus Wang & Zhou, 2015

– Pronotal strigosity as dense as that on elytra. Elytral apex lacks bush of setae. Aedeagus oblong ovoid. Body length 2.8 mm. ................................................ .............................. P. newtoni Wang & Zhou, 2015

Figures

Figs 17–19. 17 – metatibia; 18 – metatarsus; 19 – aedeagus dorsally. 17, 18 – Agathidium (Macroceble) apiforme sp. nov.; 19 – Dermatohomoeus pennatus sp. nov.

Figs 1–8. 1, 2, 6, 7 – aedeagus laterally and tip of aedeagus dorsally. 3, 5 – lateral view of body. 4, 8 – spermatheca. 1–4 – Agathidium (Agathidium) pilulum sp. nov.; 5–8 – Agathidium (Macroceble) cornigerum sp. nov. Scale bars in Figs 1, 2, 4, 6, 7, 8 = 0.1 mm; 3, 5 = 0.5 mm.

Figs 9–12. 9, 10 – aedeagus laterally and tip of aedeagus dorsally. 11 – lateral view of body.12 – spermatheca. 9–11 – Agathidium (Macroceble) apiforme sp. nov.; 12 – Dermatohomoeus pennatus sp. nov. Scale bars in Figs 9, 10 = 0.2 mm; 11 = 0.5 mm; 12 = 0.1 mm.