Oedichirus echinatus, 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 : 76-78

Oedichirus echinatus , new species

Figures 40 , 123–128

TYPE MATERIAL: Holotype: Male. ‘‘ Brazil, PR, San Jose dos Pinheiros Curitiba, 975 m II-7- 1970, JM & BA Campbell/ Holotype Oedichirus echinatus Herman. ’’ Deposited in the Canadian National Collection of Insects, Ottawa.

TYPE LOCALITY: Brazil: Paraná: São Jose dos Pinheiros (5 Pinhais) (25 ° 319S, 49 ° 139W), Curitiba, 975 m. (Left antennmere 11, left protarsus, and right metatibia and metatarsus are missing. Curitiba and São Jose dos Pinhais are towns in a large urbanized region. The coordinates and elevation given here are for S.J. Pinhais and were taken from Times Books, 1999.)

DIAGNOSIS: Oedichirus echinatus is one of three New World species with a median point extending from the transverse basal ridge of tergum III (as on sternum VIII, fig. 73). The other two species, O. bullaglaber and O. bullahirtus , can be separated from O. echinatus by the dark femorotibial maculae and the quadridentate labral margin; the latter species lacks the maculae and has only two labral denticles. Furthermore, sternum VIII of O. echinatus has a symmetrical emargination, a large, submedial cluster of spinelike setae (fig. 127), and a rather deep, sparsely punctate, ovoid, median depression, whereas for O. bullaglaber (figs. 73, 74) and O. bullahirtus (figs. 84, 85) the emargination is asymmetrical, the sternal surface has a submedial tumescence near the emargination, and both lack a submedial cluster of spinelike setae. The parameres of O. echinatus are fused to the median lobe, are short and strongly curved, and do not reach the apex of the median lobe (figs. 124–126). The parameres of the other two species are fused to the median lobe only basally and are long, reaching to near the apex of the ventral sclerite (figs. 70 and 71; 80 and 81).

Among the New World species the labrum is bidentate in only O. echinatus , O. lunatus , and O. procerus ; all the others have four denticles and one has six. Oedichirus procerus is separated from O. echinatus by the long, gracile form and concave elytral disc and O. lunatus is distinguished by the long, strongly curved, lateroapical process of tergum IX (fig. 168).

DESCRIPTION: Length: 5.9 mm. Length of head: 0.7 mm. Width of head: 0.9 mm. Pronotal length: 1.1 mm. Pronotal width: 1.0 mm. Elytral length: 0.9 mm. Elytral width: 1.0 mm.

Body concolorous dark reddish brown. Legs pale reddish brown to yellowish brown; femorotibial joint without dark maculation.

Head about a third wider than long (HW/ HL: 1.3). Frontoclypeal ridge incomplete, separated medially. Dorsal surface without V-shaped depression; surface coarsely and sparsely punctate; punctation present across middle and across base of head, and laterally from base of antennae to base of head; surface with large polished, impunctate spot anteriorly and subbasally. Labrum bidentate; denticle small and laterad of median emargination; surface with minute, submarginal tubercle adjacent to median emargination.

Pronotum about a fifth longer than wide (PL/PW: 1.2). Pronotum polished, with coarse, moderately dense punctation, and with moderately large impunctate spots; surface deeply and coarsely punctate, punctate submedial groove on basal two thirds. Elytra about one fifth wider than long (EW/ EL: 1.2); surface flat medially and coarsely punctate.

Abdominal terga III and IV densely punctate and without transverse rows of punctures; terga V and VI with punctures arranged in poorly defined, irregular transverse rows; segment VII moderately densely punctate; segment VIII more sparsely and less coarsely punctate. Segment III without paratergite; paratergal carina present and extending slightly beyond spiracle. Tergum III with median point extending from transverse basal ridge (as for tergum VIII, fig. 73). Tergum VIII with posterior margin shallowly and broadly rounded; transverse basal ridge with apically open median point. Tergum IX with lateroapical process moderately longer than midbasal length of tergum (LLaP/L9 5 1.4), slightly bent ventrally, and approximately parallel to other process; ventromedial margin without posteriorly directed spur (cf. fig. 158).

MALE: Sternum VI unmodified. Sternum VII (fig. 128) flattened medially and with wide, median cluster of moderately long, spinelike setae; posterior margin sinuate and broadly lobed medially. Sternum VIII (fig. 127) with moderately wide, moderately deep, symmetrical emargination of posterior margin; emargination about one fifth of length of sternum, wider than deep, with base shallowly rounded (fig. 127), and without membranous margin; surface laterad and proximad of emargination with broad, moderately deep, median depression; depression with polished surface, without punctation or pubescence, and bordered laterally by large cluster of spinelike setae; setal cluster bordered medially and laterally by ridge; cluster of setae depressed between carinae; ridges at diagonal to longitudinal axis; transverse basal ridge broadly curved anteriorly and without median point. Tergum IX with long, moderately wide process on anterior margin of anteroventral angle. Sternum IX (fig. 123) moderately asymmetrical; anterior margin moderately wide and broadly rounded; posterior margin wide and broadly rounded; lateral margins broadly sinuate.

Aedeagus asymmetrical (figs. 124–126). Ventral sclerite with emarginate apical margin and with lobe on each side of emargination (fig. 125); left lobe shorter than right and both posteriorly directed; ventral sclerite without apicoventral process extending from posterior margin and with strongly developed, ventrally directed carina adjacent to right lateral margin and extending from just distad of basal foramen to apex of lobe on lateral side of apex (fig. 125). Parameres short, fused to median lobe, moderately broad, and curved ventrally; right paramere broader, longer, and more strongly curved (fig. 124) than left (fig. 126). Internal sac with three spinelike processes (figs. 124–126).

FEMALE: Unknown.

ETYMOLOGY: The name is from the Latin echinatus , ‘‘spiny or prickly,’’ and refers to the sublateral cluster of short, spinelike setae on sternum VIII of the male.

DISTRIBUTION: Known only from the state of Paraná in southern Brazil (fig. 40).

REMARKS: The holotype is darkly pigmented and appears to be well sclerotized and a mature adult, but the aedeagus is weakly sclerotized and lightly pigmented.

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. 123–128. Oedichirus echinatus. 123. Sternum IX, male. 124. Aedeagus, right lateral. 125. Aedeagus, ventral. 126. Aedeagus, left lateral. 127. Sternum VIII, male. 128. Sternum VII, male (CLSM).