Carpophilus (Myothorax) brunneus, Chen & Hui & Huang, 2020

Chen, Xiaoxiao, Hui, Ziyan & Huang, Min, 2020, One new species and one newly recorded species in the subgenus Myothorax Murray 1864 from China (Coleoptera: Nitidulidae: Carpophilinae: Carpophilus), Zootaxa 4822 (3), pp. 434-438 : 435

Carpophilus (Myothorax) brunneus sp. nov.

( Figs. 1–11 )

Specimens examined. Holotype, ♂: Shaanxi Province, Yangling District , south campus of Northwest A &F University, economic arboretum garden, 1-IX-2016, Xiaoxiao Chen ( NWAFU) . Paratypes, 5♂, 2♀, 1-IX-2016; 1♂ 2♀, 28-VIII-2016; 1♂, 2♀, 24-VI-2016, otherwise same collection date as holotype; 2♂, 1♀, Yunnan Province, Xishuangbanna, Menglun Town , 29-III-2017 , Xiaoxiao Chen (NWAFU).

Description (Male). Length 3.1 mm, width 1.3 mm, height 0.8 mm. Body moderately convex dorsally and ventrally. Dorsal surface chestnut-brown with antennae, margins of pronotum, elytra and legs yellowish-brown, ventral surface reddish-brown with metaventrite dark brown. Dorsal and ventral surface slightly shiny, with recumbent and conspicuous grayish-yellow setae ( Figs. 1–2 ).

Head and pronotum with large and coarse punctures, 1.5× diameter of eye facet; interspaces smooth, 0.3–2.5 diameters apart. Elytra with scattered and coarse punctures smaller than punctures on pronotum, dense along elytral suture; interspaces smooth, 0.4–1.6 diameters apart. Prosternum and mesoventrite with coarse punctures, 1.6× diameter of eye facet; interspaces alutaceous, 0.5–1.2 diameters apart. Metaventrite with deep punctures smaller than punctures on prosternum; interspaces microreticulate, 0.1–3.2 diameters apart. Abdominal ventrite 1, posterior margin of ventrites 2–3, posterior two-thirds of ventrite 4 and hypopygidium with sparse and fine punctures.

Head 0.6× as long as distance between eyes. Lobes of labrum clearly exposed, with deep excision ( Fig. 5 ). Mandible with a sharp tooth apically and a moderately raised tooth subapically ( Fig. 6 ). Antennae 0.8× as long as head width, antennomere 2 subequal to 3, clavate; antennomere 8 disc-like; antennal club compact, distinctly shorter than one-half length of antennomeres 1–8 combined ( Fig. 3 ). Pronotum evenly convex and broadened basally with width 1.5× length, anterior margin emarginate, posterior margin subtruncate, lateral sides arcuate and widest basally; anterior and posterior angles blunt. Scutellar shield pentagonal. Elytra slightly shorter than combined width, posterior margin obliquely truncate. Pygidium subtruncate apically.

Terminal maxillary palpomere elongate and subconical ( Fig. 4 ). Terminal labial palpomere widened toward truncate apex. Mentum pentagonal. Antennal grooves strongly convergent posterior to mentum. Prosternum not carinate, its process slightly carinate between procoxae, slightly widening posterior to procoxae and bending to mesoventrite, narrow and widely rounded apically ( Fig. 7 ). Submesocoxal line deviating from posterior edge of coxal cavity two-thirds of the way to lateral edge and arcuately approaching anterior fifth of metanepisternum. Metaventrite distinctly concave along midline. Distance between metacoxae subequal to that between mesocoxa, longer than distance between procoxae. All tibiae slender, subtriangular, with outer subapical angles weakly produced, slightly narrower than antennal club width. Tarsi considerably narrower than tibiae, claws simple.

Tegmen of aedeagus well sclerotized, pointed apically, outer margins membranous and transparent along subapical fourth but not reaching apex, inner and outer margins of tegmen nearly straight, slightly curved subapically in dorsal view ( Figs. 8–9 ). Sternite VIII transverse, medial process moderately emarginate apically, lateral process pointed and slightly exceeding the horizontal position of the medial process ( Fig. 10 ).

Female. Differs from male in: elytra darker around scutellar shield and near posterior margin; elytra with smaller punctures; tibia slender. Ovipositor lightly sclerotized, gonocoxite without intragonocoxal invagination and with long gonostylus apically, gonostylus with width 0.2 times length and with 1–2 long setae apically ( Fig. 11 ).

Variability. Length 2.7–3.5 mm, width 0.9–1.7 mm, dorsal surface with coloration from yellowish brown to dark brown.

Comparative diagnosis. The new species is similar to C. (M.) mutilatus Erichson, 1843 , but may be distinguished by the following: lateral margins of pronotum more arcuate; punctures on pronotum coarser; pygidium truncate apically; disc of mesoventrite with more sparse punctation; tegmen with lateral margin membranous subapically.

Bionomics. Specimens were collected from rotten apples, peaches and guava.

Etymology. The specific epithet is derived from the Latin adjective “ brunneus ”, meaning “brown”, referring to the color of the elytra.

Figures

FIGURES 1–11. Carpophilus (Myothorax) brunneus sp. nov.: (1) male habitus, dorsal, (2) male habitus, ventral, (3) right antenna, dorsal, (4) left maxillary palp, dorsal, (5) labrum, (6) left mandible, dorsal, (7) prosternal process, (8) tegmen, dorsal, (9) tegmen, lateral, (10) sternite VIII, (11) ovipositor. Scale bars: 1 mm (Figs. 1–2), 0.1 mm (Figs. 8–11).