Pseudochillus (Micropseudochillus) indochinensis 2015

Fouquè, René, 2015, A review of the genera Indostola, Tagenostola, Indochillus, Pseudethas, and Pseudochillus gen. nov. in South East Asia (Coleoptera: Tenebrionidae: Stenosini), Acta Entomologica Musei Nationalis Pragae 55 (1), pp. 217-242 : 237-239

Pseudochillus (Micropseudochillus) indochinensis sp. nov.

( Figs 12, 13 , 26 , 36 )

Type locality. South Laos, Saravan Province, 40 km SW Saravan, Tad Lo Lodge.

Type material. HOLOTYPE: ♂, ‘ S-LAOS: Prov. Saravan / ca. 40 km SW Saravan / Tad Lo Lodge , at light / 28.- 29.v. 1996, 300 m / leg. Schillhammer (13).ʼ ( NHMW). PARATYPE: ‘ VIETNAM mer. / Vung Tao / 14.- 26.4.1989 / lgt. Snížek.ʼ (1 ♀ NMPC).

Description. Body length 4.2 mm (3.9–4.2 mm), body width 1.1 mm. Body dark brown, legs and antennae slightly paler.

Head length/width ratio 1.12, head widest at anterior margin of eyes. Tempora widest at posterior margin of eyes, from there slowly narrowed at distance equal to ⅔ eye length, than rounded and sharply narrowed to cervix. Genae arched from posterior margin of eyes to widest place, there arched and directly narrowed to clypeus. Clypeus concave with small tooth situated slightly to the right ( Fig. 13 ). Suborbital keel flat, indistinct. Eye groove starting from posterior margin of eye and reaching the cervical constriction. The latter prominent, situated before level of interior margin of eyes and slightly concave. Occiput without impression. Frons with two distinct impressions. Ratio of head/cervix widths 1.70. Eyes ( Fig. 36 ) completely divided by genae, dorsal part with 21 facets in 3 rows, ventral part with 8 facets arranged in arched row. Punctation slightly elongate, larger than that on vertex, almost disappearing towards clypeus and surrounding impressions. Punctures on vertex almost touching each other. Punctures on vertex and on genae with thick, yellow, forward-oriented setae 1.5–2.0 times longer than puncture diameter. Clypeus also with prominent setae oriented to the middle of clypeus and of same length as those on vertex. Interspaces between punctures strongly wrinkled.Antennae ( Fig. 26 ) with rusty yellow setae oriented forwards. Setae cut and flattened on top and there also widest, setae on middle antennomeres as long as 0.4 length of these antennomeres.Antennomeres 2–11 combined twice as long as pronotum width; antennomeres 4–9 elliptical, antennomere 3 clubshaped, antennomeres 2 and 10 trapezoidal, last antennomere cut latero-apically; antennomere 10 longest and widest, all antennomeres wider than long, antennomere 3 only 1.1 times longer than antennomere 4; length ratio of antennomeres 2–11 100: 123: 114: 114: 105: 114: 100: 100: 127: 73, width ratio 141: 164: 164: 173: 173: 173: 173: 173: 182: 127.

Pronotum longer than wide (1.11), widest at the end of second fifth; width of head / anterior edges of pronotum / widest point of pronotum / posterior edges of pronotum ratio 100: 75: 88: 65. Anterior corners obtusely rounded, not protruding. Posterior corners almost rectangular. Pronotal base straight. Anterior margin very finely convex. Lateral margin markedly cordiform. Pronotum laterally arched, with mid-longitudinal impression in posterior third. Punctation dense and large as on the vertex, rounded. Punctures almost touching each other, interspaces strongly wrinkled. Punctures with pale setae oriented forwards. Setae on entire pronotum as long as ¾ puncture diameter and very fine.

Elytra oval, widest behind middle; 3.2 times longer and 1.8 times wider than pronotum, elytra length/width ratio 1.95. Base of elytra concave, narrower than pronotal base (0.79). Each elytron with 10 rows of punctures, 8 on dorsal side, 2 on deflexed part. Intervals 3, 5, 7 and 9 keeled, interval 7 starts after first (anterior) quarter, interval 5 ends in last (posterior) fifth, keels on top with very fine teeth and with yellow close-fitting setae. Setae thin and sharp, as long as puncture diameter. Remaining intervals flat. Intervals not forming humeral corners. Punctures shallow and indistinct, rounded and as large as those on pronotum, with very fine setae as long as ½ puncture diameter. Distance between punctures in row 1.5–2.0 wider than puncture diameters. Interspaces gently wrinkled. Epipleura with one row of punctures throughout its whole length, its punctures somewhat smaller than in row 10, smaller towards apex. Humeral calli absent, apterous.

Legs finely covered with light adherent hairs. Middle and hind tibiae in males with 4–5 inner small teeth, all tibiae in females without small inner teeth. Posterior tibia width/length ratio 0.17.

Abdomen with very small rounded punctures, posteriorly smaller, only last two ventrites with larger punctures. Interspaces finely wrinkled. Distance between punctures on first three ventrites twice longer than puncture diameter, on last two ventrites equal to puncture diameter. Ventrites with very fine setae as long as two puncture diameters.

Aedeagus ( Fig. 43 ) length approximately 1.1 mm.

Diagnosis. Pseudochillus (M.) indochinensis sp. nov. can be distinguished from P. (M.) palawanus sp. nov. and P. (M.) thailandicus sp. nov. by very short and adherent setae on elytra, punctures on elytra shallow and indistinct, distance between punctures in row on elytra equal to 1.5–2.0 diameter of the punctures, while both remaining species have longer erected setae on elytra. Pseudochillus (M.) palawanus also has deep punctures on elytra and distance between punctures in row on elytra is smaller than diameter of these punctures. Pseudochillus (M.) thailandicus also has deep punctures on elytra and mid-longitudional impression on occiput.

Etymology. Named after Indochina, old name of the region in SE Asia where the type species was collected.

Distribution. Laos: Saravan Province and Vietnam: Bà Rịa-Vũng Tàu Province.

Figures

Figs 10–16. 10–12 – dorsal view:10 – Pseudochillus (Micropseudochillus) palawanus sp.nov., holotype♂, Philippines (Palawan); 11 – P.(M.) thailandicus sp. nov., holotype ♂, Thailand.; 12 – P.(M.) indochinensis sp. nov., paratype ♀, Vietnam. 13 – P.(M.) indochinensis sp. nov., tooth on clypeus; 14–15 – humeral corner: 14 – P.(Kaszabochillus) helferi sp. nov.; 15 – P.(Pseudochillus) bangaloreanus (Kaszab, 1981). 16 – P.(P.) bangaloreanus (Kaszab, 1981), punctures on epipleura. Scale bar = 4 mm (Figs 10–12).

Figs 17–26. Antenna. 17 – Indochillus cristatus Koch, 1941. 18 – Pseudochillus (Pseudochillus) bangaloreanus (Kaszab, 1981). 19 – P.(P.) aalbui sp. nov. 20 – P.(Kaszabochillus) andamanus (Kaszab, 1981). 21 – P.(K.) helferi sp.nov. 22 – Indostola kaengkrachanensis sp.nov. 23 – I.pulchella Medvedev, 1991.24 – Pseudochillus (Micropseudochillus) palawanus sp. nov. 25 – P.(M.) thailandicus sp. nov. 26 – P.(M.) indochinensis sp. nov. Scale bar = 1 mm.

Figs 27–36. Lateral view of head with eyes. 27 – Indostola pulchella Medvedev, 1991. 28 – I. kaengkrachanensis sp. nov.29 – Indochillus cristatus Koch, 1941. 30 – Pseudochillus (Pseudochillus) bangaloreanus (Kaszab, 1981). 31 – P. (P.) aalbui sp. nov. 32 – P.(Kaszabochillus) andamanus (Kaszab, 1981). 33 – P.(K.) helferi sp. nov. 34 – Pseudochillus (Micropseudochillus) palawanus sp. nov. 35 – P.(M.) thailandicus sp. nov. 36 – P.(M.) indochinensis sp. nov.

Figs 37–43. Aedeagus. 37 – Indostola kaengkrachanensis sp. nov. 38 – I. pulchella Medvedev, 1991. 39 – Pseudochillus (Pseudochillus) bangaloreanus (Kaszab, 1981). 40 – Pseudochillus (P.) aalbui sp. nov. 41 – Pseudochillus (Micropseudochillus) palawanus sp. nov. 42 – P.(M.) thailandicus sp. nov. 43 – P.(M.) indochinensis sp. nov. Scale bars: 0.5 mm (Figs 37, 38, 40–42), 1 mm (Fig. 39, 43).