Oedichirus bullahirtus, 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 : 57-60

Oedichirus bullahirtus , new species

Figures 40 , 80–88

TYPE MATERIAL: Holotype. Male. ‘‘Bras. Sao Paulo Cantareira 9.8.14? Mráz/ optatus Sharp det Rambousek/v Rambousek vgl. m typus in Mus. London/Chicago NHMus M.Bernhauer collection/ Holotype Oedichirus bullahirtus Herman. ’’ Deposited in the Field Museum of Natural History. (Left antennomeres 3–11 and right maxillary palpomeres 3 and 4 are missing. On the locality label the ‘‘t’’ in Cantareira is faded and the pin hole goes through the second ‘‘r,’’ so both require particular attention to decipher.)

PARATYPES: Two females. Brazil: (São Paulo state): São Paulo, Mráz. Deposited in the Field Museum of Natural History.

TYPE LOCALITY: Brazil: São Paulo: Cantareira (23 ° 279S, 46 ° 389W). ( Paynter and Traylor [1991: 121], from which the coordinates were taken, indicate this site is a northern suburb of São Paulo. The northern edge of the city is contiguous with a large, forested, mountainous area labeled as ‘‘Parque de Cantareira’’ on Google Earth.)

DIAGNOSIS: This species and only two others in the New World have a median point

on tergum III (as on tergum VIII, fig. 73). They are from the neighboring states of São Paulo ( O. bullahirtus ), Paraná ( O. echinatus ), and Santa Catarina ( O. bullaglaber ). The legs of O. bullahirtus and O. bullaglaber are bicolored, those of O. echinatus are unicolorous. The males of O. bullahirtus and O. bullaglaber have a moderately asymmetrical emargination of sternum VIII (figs. 73, 84), whereas the emargination is symmetrical for O. echinatus (fig. 127). The females of O. echinatus are not known.

Sternum VIII of the males of O. bullahirtus and O. bullaglaber has a subapical, submedial tumescence to the right of a small, asymmetrical emargination of the posterior margin. The males of the two species can be separated as follows: the median tumescence of sternum VIII of O. bullahirtus has a few setae (fig. 84), the surface is nearly flat (fig. 85), and the posterior and right margins are moderately well developed and slope sharply (fig. 85), whereas O. bullaglaber lacks setae on the tumescence (fig. 73), the surface is rounded (fig. 74), and the posterior and right margins are indistinct and slope gradually (fig. 74). As for the aedeagus, the posterior margin of the ventral sclerite of O. bullahirtus is entire (fig. 81), but has a rounded, submedial notch in O. bullaglaber (fig. 71). The internal sac of O. bullahirtus has a long, spiniform process (fig. 83); O. bullaglaber has a short spurlike process (figs. 77, 78). Sternum VIII has a well developed median point on sternum VIII in O. bullaglaber (fig. 73), but it is more weakly developed in O. bullahirtus (fig. 84).

The females of O. bullahirtus and O. bullaglaber are separated by the unicolored body of the former and the bicolored body of the latter. The median gonocoxal plate and the vulvar plate of the two species are similar (cf. figs. 88 and 79).

DESCRIPTION: Length: 7.0– 9.7 mm. Length of head: 0.8–1.0 mm. Width of head: 1.1–1.3 mm. Pronotal length: 1.4–1.7 mm. Pronotal width: 1.0– 1.3 mm. Elytral length: 1.0– 1.2 mm. Elytral width: 1.1–1.3 mm.

Body concolorous dark reddish brown; head and pronotum nearly black, elytra and abdomen slightly paler, black to dark reddish brown. Legs yellowish brown with dark femorotibial spot; femoral maculation dark reddish brown, large, and distinct; tibial spot developed only as slightly darker infusion, small, and indistinct.

Head wider than long (HW/HL: 1.3). Frontoclypeal ridge incomplete, separated medially. Dorsal surface without V-shaped depression; surface coarsely punctate; punctation dense medially and laterally and sparser basally. Labrum quadridentate; surface without tubercle near submedial denticle.

Pronotum longer than wide (PL/PW: 1.3). Pronotum polished and with coarse, moderately dense punctation; basal half with submedial punctures arranged in indistinct row. Elytral length about a tenth less than width (EW/EL: 1.1); surface slightly convex and coarsely punctate.

Abdomen segments evenly and coarsely punctate and without transverse rows of punctures; segments III to VI with coarser, denser punctation than VII and VIII. Segment III without paratergite; paratergal carina extending to about middle of segment, but poorly developed beyond spiracle. Tergum III with median point extending from transverse basal ridge. Tergum VIII with truncate posterior margin; transverse basal ridge with apically open median point. Tergum IX with lateroapical process about a fifth longer than midbasal length (LLaP/L9 5 1.2), moderately bent ventrally, and approximately parallel to or slightly divergent from other process; ventromedial margin without posteriorly directed spur (cf. fig. 158).

MALE: Sterna VI and VII unmodified. Sternum VIII with shallow, asymmetrical emargination (fig. 84); emargination about one seventh of length of segment, wider than deep, and with basal margin moderately broadly rounded; posterior margin laterad of median emargination slightly emarginate; surface with large, median tumescence proximad of emargination (fig. 85); tumescence asymmetrical, higher posteriorly and to right side of midline; tumescence steeply sloped, nearly perpendicular, on posterior and right sides and gradually sloped on anterior and left sides; tumescence with moderately distinct posterior and right margins; tumescence with surface nearly flat (fig. 85), polished, and with a few setate punctures (fig. 84); surface laterad of emargination with shallow, elliptical depression (fig. 85); depression with translucent integument on apical half to apical third; surface without comb or hyaline margin; transverse basal ridge with weakly developed median point (figs. 84, 85). Tergum IX with small rounded lobe on anterior margin of anteroventral angle. Sternum IX (fig. 86) slightly asymmetrical; anterior margin moderately wide and slightly rounded; posterior margin broadly and shallowly rounded; lateral margins broadly rounded.

Aedeagus asymmetrical (figs. 80–82). Ventral sclerite with broad, moderately deep, subapical depression, with low rounded ridge on right side, and without apicoventral process extending from posterior margin; posterior margin of ventral sclerite entire, without notch (fig. 81). Parameres moderately wide basally and tapered apically; parameres fused to median lobe from base to near apex, parameres free of median lobe apically. Internal sac with long, spiniform process (fig. 83).

FEMALE: Sternum VIII with irregularly sinuate transverse basal ridge; posterior margin rounded and slightly sinuate. Tergum IX with anteroventral angles separated medially (fig. 87). Median gonocoxal plate anteriad of vulvar plate trapezoidal medially and anterior margin nearly straight medially and lateral margins steeply sloped lateroposteriorly (fig. 87); gonocoxal plate posteriad of vulvar plate tapered to broadly rounded posterior margin. Vulvar plate embedded in gonocoxal plate anteriorly (fig. 87). Anterior vulvar lobe (fig. 88) embracing anterior and right lateral margin of posterior vulvar lobe; surface largely membranous, wrinkled, and with indeterminate ornamentation. Posterior vulvar lobe with most of surface covered with cobble (fig. 88). Vulva with indeterminate orientation.

ETYMOLOGY: The name is from the Latin bulla, ‘‘knob or boss,’’ and hirtus, ‘‘hairy,’’ and refers to the setose surface of the subapical tumescence of sternum VIII of the male.

DISTRIBUTION: The species is known from the state and city of São Paulo (fig. 40).

REMARKS: The holotype and the two females were identified as O. optatus in the Field Museum collection, but differ from that species by the labral denticulation, color pattern of the legs, median point of the transverse basal ridge of tergum III, and features of sternum VIII of the males and aedeagus.

Four species, O. bicristatus , O. brunneus , O. bullahirtus , and O. ohausi are reported herein from the state of São Paulo. Of these only O. bullahirtus has a median point (as in sternum VIII, fig. 73) on tergum III. Among the four species, only O.brunneus and O. bullahirtus have bicolored legs, the other two have concolorous legs.

Two females from São Paulo are identified herein as O. bullahirtus . They share with the holotype the presence of a median point and paratergal carina on tergum III, bicolored legs, and unicolored body. These shared features, particularly the median point of tergum III, along with collections from nearby sites seem sufficient to propose their conspecificity with the holotype of O. bullahirtus .

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. 80–87. Oedichirus bullahirtus. 80. Aedeagus, right lateral. 81. Aedeagus, ventral. 82. Aedeagus, left lateral. 83. Aedeagus, laterodorsal, apical third. 84. Sternum VIII, male. 85. Sternum VIII, setae removed, male. 86. Sternum IX, male. 87. Segment IX, ventral, female.

Fig. 88. Oedichirus bullahirtus. Segment IX, vulvar plate, enlarged (CLSM).