Arthromacra anoulak, Telnov, 2023

Telnov, Dmitry, 2023, New and poorly-known taxa of Lagriinae Latreille, 1825 (Coleoptera: Tenebrionidae) predominantly from the collections of the Naturkundemuseum Erfurt. 1, Baltic Journal of Coleopterology 23 (1), pp. 1-33 : 1-33

Arthromacra anoulak sp. nov. ( Figs 3–4 )

urn:lsid:zoobank.org:act:A54841AE-3724-4BF5-9E71-13A6A1C7F0E8

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Type material designated. Holotype male NME: LAOS, NE, P: Hua Phan Ban Saleui, Phou Pan (Mt.), 1300-1900m, 03- 30.IV.2014, 20°12'N 104°01'E, lg. Holzschuh [printed] // collection NATURKUNDEMUSEUM ERFURT [printed, label yellow].

Paratypes 7 specimens. 1 male, 2 female & 1 not sexed specimen NME , 1 male & 1 female DTC: same labels as holotype; 1not sexed specimen NME: NE – LAOS, Hua Phan prov. Ban Saleui, Phou Pan (Mt.), 1300-1900m, 11.IV.-15.V.2012, 20°12' N, 104°01' E, leg. C. Holzschuh [printed] // collection NATURKUNDEMUSEUM ERFURT [printed, label yellow] .

Derivatio nominis. Named from Lao ‘anoulak’ (conservation) to point on the importance of the Annamite Range biodiversity hotspot for conservation of biological diversity in south-eastern Asia. Noun in apposition.

Measurements. Holotype male ( Fig. 3A ). Total body length 8 mm; head length 1.2 mm, head width across compound eyes 1.2 mm, pronotal length 1.2 mm, pronotal width across anterior margin 1.05 mm, across median portion 1.15 mm, across base 1.15 mm, elytral length 5.6 mm, combined maximum elytral width across midlength 2.1 mm. Paratypes males 7.8–8 mm, paratypes females 8.5–9.2 mm long.

Description. Holotype male, body elongate, slender, flattened in dorsal aspect. Dorsal and ventral head and elytra uniformly dull khaki green. Dorsal and ventral pronotum dull red. Anterior leg black or yellowish-brown at insertion, trochanter yellowish to reddish brown. Middle and posterior legs black-brown with basal part of femora and trochanters yellowish. Antenna generally black, antennomere two brownish. Abdomen, meso- and metasternum dull khaki green. Maxillary palpus brown with

6 darker terminal palpomere. Head opaque dorsally and ventrally except for a slightly glossy labrum, somewhat flattened in dorsal aspect. Labrum shallowly emarginate at anterior margin. Frontoepistomal impression rather deep, distinct. Anterolateral area of frons strongly projected laterodorsad to hold insertion of antenna. Compound eye large, slightly reniform, shortly notched at anterior margin opposite insertion of antenna, shallowly and broadly emarginate at posterior margin, strongly protruding beyond lateral and dorsal outline of head. Minimum interocular distance twice a length of dorsal eye portion. Tempus short, constricted posteriad, about third a length of dorsal eye portion. Head dorsal punctures dense, irregularly shaped (elliptical to penta- and hexagonal), moderately deep. Intervening spaces generally much narrower than punctures, rugulose-like elevated. Both punctures and intervening spaces with dense isodiametric microsculpture. Head dorsum and venter nearly glabrous, with separate short, inconspicuous setae; setae on labrum and external margin of mandible longer and more prominent. Antenna filiform, moderately long, extending slightly beyond metacoxal cavity when directed posteriad. Basal antennomere short and thickened, about twice as long as antennomere two. Antennomere three about 2.5– 2.6× as long as preceding antennomere and about same length as antennomere four. Antennomeres 5–6 about same length, each about 1.2× as long as each antennomere three and four. Penultimate antennomere slightly shortened. Terminal antennomere elongate, 1.1 mm long, slightly arched distally, about 4.2× as long as penultimate and 1.2–1.3× as long as combined length of two preceding antennomeres. Terminal maxillary palpomere subcultriform. Pronotum opaque dorsally, subopaque to slightly glossy laterally and ventrally, flattened in dorsal aspect, dorsal shape subcylindrical, widest across midlength and base. Anterior and posterior margin subtruncate, without anterior and basal rim. Antero- and posterolateral angle rounded; anterolateral angle barely protruding laterad dorsal view. Dorsal pronotal punctures similar as those on head but somewhat smaller, intervening spaces about as wide as punctures, elevated. Both punctures and intervening spaces with dense isodiametric microsculpture. Disc of pronotum glabrous. Prothoracic hypomeron slightly glossy, densely punctate, in part corrugate, with minute and sparse appressed whitish setae. Anterior margin of pronotum with a row of short, sparse, whitish setae. Scutellar shield small, triangular, rounded at posterior margin, opaque. Elytron elongate, slender, nearly parallel-sided, flattened dorsally. Humerus rounded, humeral callosity barely elevated. Postbasal transverse impression not indicated. Posterior sutural angle rounded in dorsal view. Elytral deflected lateral margin visible in dorsal view except at humerus. Three to four very inconspicuous, barely elevated longitudinal costae on each elytron. Elytral punctures small, rather deep, variably dense. Intervening spaces as wide as to 3× as wide as punctures, opaque and with dense isodiametric microsculpture. Disc of elytron glabrous. Epipleuron complete, sparsely punctate, widest in basal fourth. Metathoracic wings fully developed (functional). Legs long and slender. Femora slender, not clavate. Tibiae shorter than corresponding femora, without modifications. Protarsomeres somewhat widened likely pointing on arboreal lifestyle. Male basal metatarsomere as long as combined length of remaining metatarsomeres. Male tergite VII broadly rounded at posterior margin. Male morphological sternite VII subtruncate medially at posterior margin. Male morphological sternite IX of paired Y-like shaped, apically rather strongly expanded arms. Aedeagus as in Fig. 4 .

Sexual dimorphism. Female ( Fig. 3B ) body comparatively more robust with somewhat wider elytra, minimum interocular distance 2–2.2× a length of dorsal eye portion, terminal antennomere 1 mm long, about 2.5–2.6× as long as penultimate antennomere and 1.2× as long as combined length of two preceding antennomeres, tergite VII and morphological sternite VII rounded at posterior margin.

Differential diagnosis. Due to the densely punctured, in main part greenish dorsum most similar to Arthromacra subopaca (Pic, 1910) ( China: Yunnan) but is different in the opaque dorsum (the dorsum with the glossy intervening spaces between punctures in A. subopaca ), the dark red pronotum (the dorsum uniformly bluish in A. subopaca ), the dark legs and antennae (the legs and antennae pale rufous in A. subopaca ), the comparatively less coarse and sparser elytral punctures, and the slightly larger body.

Ecology. Occurs at 1300–1900 m in primary mid-montane rainforest.

Distribution. Phou-Pan Mountain, Annamite Range, central Laos.

Figures

Fig. 3.Arthromacra anoulak sp. nov., habitus, dorsal view. A – Holotype male; B – Paratype female [not to scale].

Fig. 4.Arthromacra anoulak sp. nov., holotype male, aedeagus in dorsal (A), ventral (B) and lateral (C) view.