Bolitogyrus inexspectatus Brunke

Brunke, Adam J. & Solodovnikov, Alexey, 2014, A revision of the Neotropical species of Bolitogyrus Chevrolat, a geographically disjunct lineage of Staphylinini (Coleoptera, Staphylinidae), ZooKeys 423, pp. 1-113 : 59-60

Taxon classification Animalia Coleoptera Staphylinidae

Bolitogyrus inexspectatus Brunke sp. n. Figs 10D, 19 K–M, 24D, 31B (map)

Type locality.

Costa Rica, San Jose, Jigueral.

Type material.

Holotype ♂ (PTC): San Jose, Jigueral, 850 mts., Finca J. Chavez [white printed label] / ex. pore mushrooms on log, ‘25/Feb/1998’, CR#803, P.N. Thomas [white printed label] / ILLUSTRATED [pink printed label] / Holotype, Bolitogyrus inexspectatus Brunke, sp. n. [red printed label].

Diagnosis.

Within the Bullatus Lineage: pronotum with two punctures in the dorsal row (Fig. 7C); dark abdominal segment VIII (except for narrowly pale base); humerus with pale marking wider than half the distance between scutellum and humeral angle (Fig. 10D).

Description.

Measurements ♂ (n=1): HW/HL 1.67; PW/PL 1.50; EW/EL 1.21; ESut/PL 0.85; forebody length 4.0 mm.

Similar to Bolitogyrus divisus and differing only the following: head with faint metallic bronze reflection; pronotal protuberance not paler than rest of disc; elytra with apical margin more distinctly pale, humeral area with broad, semi-circular pale spot reaching beyond half the distance from humerus to scutellum, epipleuron with small, pale spot about midlength; abdominal paratergites paler at base and apex, abdominal sternites with apicolateral pale spots; abdominal segments not distinctly darker than one another; tergite VIII dark with narrowly pale base; genital segment dark; pro- and mesofemur entirely pale, metafemur with small, subapical dark band; head with frontal impression not obscured by sculpture, frons relatively smooth, sculpture weakly formed; posterior protuberances of head entirely impunctate or with one puncture; pronotum without micropunctures on disc; pronotal protuberance weakly developed in lateral view; with two punctures in dorsal row of pronotum; scutellum with several coarse, contiguous and shallow, asetose punctures; lateral lobes of aedeagus with subapical tooth projecting at right angle to dorsoventral plane, tooth completely flattened and rounded at apex (Fig. 19 K–L); lateral lobes in parameral view broadly separated at base by a U-shaped emargination, becoming narrowly separated and parallel in apical half, together forming an arrowhead shape (Fig. 19K); paramere in lateral view flexed ventrad and contacting median lobe; paramere bifurcate, in parameral view, lobes separated by very broadly rounded emargination (Fig. 19K); paramere with only one, large peg seta on one lobe, other lobe with peg setae (Fig. 19L). Female unknown.

Distribution.

Figure 31B. Known only from the type locality in Costa Rica.

Bionomics.

The holotype was collected in February, at a relatively low elevation from a log overhanging a creek ('Rio Chavez’) running through a ravine (P.N. Thomas pers. comm.).

Etymology.

Bolitogyrus inexspectatus externally resembles Bolitogyrus tortifolius and Bolitogyrus pseudotortifolius and it was initially thought that these species could be closely related. The species epithet refers to the ‘unexpected’ discovery of the distinct aedeagal characters of the Divisus Group in this species.

Comments.

Of the species sympatric with Bolitogyrus inexspectatus , Bolitogyrus bullatus is the only similar species. It can be readily distinguished from it by the pronotum with two punctures in the dorsal row.