Oedichirus glabrihamus, Herman, 2013

Herman, Lee H., 2013, Revision Of The New World Species Of Oedichirus (Coleoptera: Staphylinidae: Paederinae: Pinophilini: Procirrina), Bulletin of the American Museum of Natural History 2013 (375), pp. 1-137 : 87-90

Oedichirus glabrihamus , new species

Figures 40 , 153–156

TYPE MATERIAL: Holotype: Male. ‘‘ Brazil, Chapeco 27 ° 079, 52 ° 369 VII. 1960,600m. F. Plaumann/ Holotype Oedichirus glabrihamus Herman. ’’ Deposited in the Canadian National Collection of Insects, Ottawa.

TYPE LOCALITY: Brazil: Santa Catarina : Chapeco, 27 ° 079S, 52 ° 369W, 600 m.

DIAGNOSIS: Oedichirus glabrihamus is one of five species, including O. sparsipennis , O. speculifrons , O. bullaglaber , and O. apiculus , from Santa Catarina state, Brazil. The dark femorotibial spots will separate O. sparsipennis and O. bullaglaber from O. glabrihamus that lacks the maculations. Tergum III of O. bullaglaber has a median point (as for sternum VIII, fig. 73), O. glabrihamus does not. The aedeagus of the remaining three species, O. glabrihamus , O. apiculus , and O. speculifrons , has an apicoventral process that curves apicolaterally to the right. The aedeagus of O. apiculus has a short, slender, posteriorly directed spiniform process on the right dorsolateral margin of the ventral sclerite just proximad of the base of the apicoventral process (figs. 41, 44) and O. glabrihamus has an acutely pointed lobe in about the same position (fig. 153); O. speculifrons (fig. 211) lacks either a spine or lobe. Sternum VIII of O. speculifrons has a transverse, rounded, subapical ridge that has a low boss at each end from which a low ridge extends anteriorly (fig. 208); O. glabrihamus lacks these ridges and bosses. Sternum VIII of O. glabrihamus has a broad median depression that extends for most of the length of the segment and is bordered laterally by a large cluster of spinelike setae (fig. 155); O. speculifrons has a less dense cluster of setae (fig. 209). In ventral view the aedeagal apicoventral process for O. glabrihamus is short and wide (fig. 154), but long and slender for O. speculifrons (fig. 212). A fourth species, O. misionesiensis , is a part of a cluster of similar species that includes O. speculifrons , O. glabrihamus , and O. apiculus . The left side of the aedeagal apicoventral process of O. misionesiensis has a large, cylindrical peg-boss (fig. 173) that is lacking in O. glabrihamus (fig. 154).

Oedichirus glabrihamus is distinguished from the males of other species in the New World by the symmetrical emargination of sternum VIII (fig. 155) and the stout apicoventral process of the ventral sclerite of the aedeagus (fig. 154). Furthermore, the labrum is quadridentate, the legs lack a femorotibial maculation, abdominal segment III has a paratergal carina, and tergum III has no median point (as in sternum VIII, fig. 73).

DESCRIPTION: Length: 7.1 mm. Length of head: 1.0 mm. Width of head: 0.8 mm. Pronotal length: 1.3 mm. Pronotal width: 1.2 mm. Elytral length: 0.9 mm. Elytral width: 1.1 mm.

Body concolorous reddish brown. Legs reddish brown basally gradually changing to yellowish brown apically and without dark femorotibial spot.

Head wider than long (HW/HL: 1.4). Frontoclypeal ridge incomplete and separated medially. Dorsal surface without V-shaped depression; surface coarsely and densely punctate; punctation evenly distributed; surface polished between punctures and, except for frontoclypeal region, devoid of distinct, impunctate median, basal, or lateral spots. Labrum quadridentate; surface without tubercle near submedial denticle.

Pronotum longer than wide (PL/PW: 1.1). Pronotum polished and with coarse, dense punctation clustered in submedial and sublateral clusters; surface with medial, submedial, and sublateral impunctate spots; surface without submedial punctate groove. Elytra with width greater than length (EW/EL: 1.2); surface feebly convex and coarsely punctate.

Abdomen densely and uniformly punctate; punctures not arranged in rows on most of surface and with subapical impunctate strip; punctation of segments III to VI coarse, punctation of VII and VIII less coarse and less dense. Segment III without paratergite; paratergal carina present and extending beyond spiracle for nearly two thirds of length of segment. Tergum III without median point extending from transverse basal ridge. Tergum VIII with posterior margin broadly rounded and with median region slightly flattened; transverse basal ridge broadly curved anteriorly and without median point. Tergum IX with lateroapical process slightly longer than midbasal length of tergum (LLaP/L9 5 1.1), slightly curved ventrally, and slightly divergent posteriorly from other process; ventromedial margin without posteriorly directed spur (cf. fig. 158).

MALE: Sternum VI unmodified. Sternum VII with clustered row of five moderately closely spaced, slightly thicker setae at middle of posterior margin. Sternum VIII (fig. 155) with broad, moderately deep, symmetrical emargination of posterior margin; emargination about one sixth of length of sternum, wider than deep, and with basal margin narrowly rounded; margin of emargination sclerotized, not membranous; surface with moderately deep, oval, median depression extending from near transverse basal ridge to near base of posterior emargination; depression sparsely and finely punctate; surface adjacent to lateral margin of depression with dense cluster of slightly thicker setae (fig. 155); surface without combs or carinae; transverse basal ridge with middle strongly and abruptly curved anteriorly and without median point (fig. 155). Tergum IX with short, wide process on anterior margin of anteroventral angle. Sternum IX (fig. 156) slightly asymmetrical; anterior margin narrow and strongly rounded; posterior margin wide and broadly rounded; lateral margins broadly rounded.

Aedeagus asymmetrical (fig. 154). Ventral sclerite with apical margin of ventral sclerite broadly curved from left lateral margin to base of large apicoventral process extending from right side of apical margin (fig. 154); apicoventral process wide in ventral view, strongly and evenly tapered to acute apex, strongly curved laterally to right with apex curved anteriorly, and ventral surface broadly and shallowly convex; ventral sclerite with well-developed carina near right lateral margin extending to base and continuous with short, strongly curved anterior margin of apicoventral process; ventral sclerite with acutely pointed lobe on right dorsolateral edge near base of apicoventral process (fig. 153). Parameres curved ventrally, moderately broad basally, flattened, tapered and slender apically, basal half tightly appressed or perhaps fused to median lobe, apical half free of median lobe; parameres reaching to near posterior margin of ventral sclerite.

FEMALE: Unknown.

ETYMOLOGY: The name is from the Latin glaber, ‘‘hairless or smooth,’’ and hamus, ‘‘hook,’’ and refers to the hooked form of the apicoventral process and its smooth, unadorned, polished surface.

DISTRIBUTION: Known only from southern Brazil (fig. 40).

Figures

Figs. 39–40. Oedichirus species. Distribution. 39. Mesoamerica and the Caribbean. 40. South America. (Species described prior to present work preceded with *. Symbols ³ or ♀ signify species known only by the sex indicated. Open circle denotes multiple collecting sites.)

Figs. 153–156. Oedichirus glabrihamus. 153. Aedeagus, right lateral. 154. Aedeagus, ventral. 155. Sternum VIII, male. 156. Sternum IX, male.