Arthrobrachus solervicensi, Estrada, Patricia, 2016

Estrada, Patricia, 2016, Species of the genus Arthrobrachus Solier, 1849 (Coleoptera: Melyridae) distributed to the East of the Andes, Zootaxa 4092 (3), pp. 371-387 : 383-385

Arthrobrachus solervicensi n. sp.

( Figure 9 )

Holotype: Male from Neuquen, Köler //32473// Mus. Arg. Cs. Nat. // Arthrobrachus solervicensi Estrada, 2015 (handwritten) // Holotype. Deposited in MACN.

Paratypes: Two males labelled as follows: col. A. Breyer // Neuquen, leg. Köhler // Mus. Arg. Cs. Nat. // Arthrobrachys testaceolimbatus Stein (handwritten) // Arthrobrachus solervicensi Estrada, 2015 // Paratype. Deposited in MACN (1 ♂). Neuquen, leg. Köhler // Mus. Arg. Cs. Nat. // Arthrobrachys testaceolimbatus Steinh. (handwritten) //324723// circular (black) // Arthrobrachus solervicensi Estrada, 2015 // Paratype. Deposited in MACN (1 ♂).

Etymology. in honour to Professor Jaime Solervicens A., in recognition to the teacher and mentor in the area of the Natural Sciences. For his friendship, example, stimulus, and support in my professional and personal development.

Diagnosis. Generally with five mesally dilated preapical antennomeres ( Fig. 9 i); pronotum with slightly marked circular impression near hind angles; metasternum with two brush-like short rows of setae located on elevated base; epipleura wide, sides convergent at the apex, without denticles in the inner margin; ventrite 6 of males with a single transverse plate, distal edge with strong V shaped emargination ( Fig. 9 h); last tergite subsquare, distal angles rounded, distal margin lightly emarginate ( Fig. 9 h); parameres short, apex wide, truncate, with light central V-shaped emargination, each with a long median and a short lateral tuft of hairs; tegminal plate flat ( Fig. 9 a–c); median lobe sclerotized, flection area wide ( Fig. 9 d–f).

Description. Average body length 3.95 mm (range: 3.5–4.5 mm), length: width ratio 2.05:1, sides subparallel; fine punctures in head and pronotum, dense in head and scattered in pronotum, punctuation on elytra coarse and dense; vestiture of thick, short, erect, abundant hairs; head and pronotum black, rest of the body dark testaceous, elytra light testaceous, generally with dark borders; legs orange. Four measured specimens.

Head: Included eyes almost as wide as the apex of the pronotum (0.993:1); antennae almost as long as the pronotum (0.994:1), generally with five mesally dilated preapical antennomeres ( Fig. 9 i).

Thorax: Pronotum wider than long (1.4:1), moderately convex transversely and longitudinally, base wider than the apex (1.52:1) and narrower than the humeral region (0.875:1), anterior margin slightly convex, anterior and posterior margins very fine, lateral margins curved, lateral edges of disc flattened, circular impression slighty marked near basal angles; elytra 1.59 (±0.06) longer than wide, sides subparallel, rounded toward the apex, disc moderately convex, slightly declined in the distal fourth, lateral edges marked, somewhat flattened, almost as wide as the epipleura and of uniform width until the apex; epipleura wide, sides convergent at the apex; metasternum with two brush-like short rows of setae located on elevated base; legs scarcely punctate and subglabrous, all the tibiae with thin spines in the outer margin.

Abdomen: Male ventrite 5 moderately curved ventrally, distal margin lightly emarginated at center; ventrite 6 with a single transverse sclerotized plate, distal edge with a strong V shaped emargination, base with subtriangular less sclerotized central area; last tergite subsquare with rounded distal angles and less sclerotized basal central area, distal margin lightly emarginated ( Fig. 9 h); segment 9 with tergum almost membranous, like a narrow strip, with fine sternal arms and moderately long apodema ( Fig. 9 g). Genitalia: Parameres short and wide, moderately convex, sides subparallel, apical margin truncated with light central V shaped emargination and with a long mesal and a short lateral tuft of hairs on each side, lateral margins slightly bent mesally, from a lateral view its ventral margin forming an obtuse angle with the tegmen, base of parameres with marked dorsal flange; lateral arms of tegmen moderately thick and parallel, convergent at the base, tegminal plate flat, weakly sclerotized, distal margin emarginated, apodeme flat, hooklike ( Fig. 9 a–c); median lobe sclerotized, subcylindrical, sides strongly convergent toward the apex, straight from a lateral view, forming an obtuse angle with the apodeme, apex acuminate, dorsal surface membranous at apical half, flection area wide, apodeme long ( Fig. 9 d–f).

Distribution. ARGENTINA ( Fig. 10 ): Provinces of Neuquén (IPCN, MACN) and Río Negro (IPCN, MACN).

Figures

FIGURE 9. Arthrobrachus solervicensi n. sp: Male genitalia: Tegmen and parameres: a: dorsal view; b: ventral view; c: lateral view; Median lobe: d: dorsal view; e: ventral view; f: lateral view. Terminal segments of the abdomen: g: IX segment; h: V, VI ventrites and last tergum; Antenna: i. Scale 0.5 mm.

FIGURE 10. Geographic distributions of: A. antonioi n. sp, red line area; A. armandoi n. sp. dark blue solid area; A. eloisae n. sp. green solid area; A. flavomarginatus, light green horizontal lines area; A. nigromaculatus, blue vertical lines area; A. ruftarsis, light blue solid area; A. solervicensi n. sp. dark cyan horizontal lines area.