Allotrochus cubensis, Irmler, 2015

Irmler, Ulrich, 2015, Osoriinae of Cuba with description of new species and an identification key (Coleoptera: Staphylinidae), Acta Entomologica Musei Nationalis Pragae 55 (1), pp. 145-172 : 146-147

Allotrochus cubensis sp. nov.

( Figs 1A,C,D , 5A )

Type locality. Cuba, Sierra Maestra.

Type material. HOLOTYPE: ♂ ( NMPC): ‘ Cuba, N. Sierra Maestra [~ 20°07′N, 76°33′W], Oct. 1928, leg. Dr. Rambousek’. PARATYPES: 3 ♂♂ 4 ♀♀ ( NMPC, IES, UIC): with same labels as holotype ; 19 spec. ( NMPC, UIC): Prov. Granma, La Platica, P.N. Turquino, saddle below La Mariposa, ca. 0.8 km SE La Platica (by air), 1050 m elevation, sifting of leaf litter and decaying wood in the low secondary evergreen forest with rather rich understory (76°52.09′W, 20°00.05N), 24.vi.2012, leg. Deler-Hernández & M. Fikáček ; 1 spec. ( NMPC): same region, but La Siguapa ca. 1.5 km SE (by air) (76°52.08′W, 20°00.02′N), 1290 m elevation, sifting of leaf litter in evergreen forest, 25.vi.2012, leg. Cala-Riquelme ; 7 spec. ( NMPC): same region, but slope below Pico Naranjo ca. 0.4 km N La Platica (by air) (76°53.03′W, 20°00.09′N), 950 m elevation, sifting of rather dry leaf litter and decaying wood in the secondary bushes with thin litter layer, 24.vi.2012, leg. Deler-Hernández & M. Fikáček ; 13 spec. ( NMPC, UIC): same region, but trail to ca. 0.5 km S (by air) from La Platica (76°53.03′W, 20°00.05′N), 950 m elevation, sifting of leaf litter and decaying wood in the secondary forest with many tree ferns and rich understory vegetation, 23.–27.vi.2012, leg. Deler-Hernández & M. Fikáček.

Diagnosis. The species resembles Allotrochus marginatus ( Sharp, 1887) in size and punctation. It can be easily differentiated from A. marginatus by the distinctly rectangular shoulders that each carries a shortly prominent tooth. Furthermore, the elytra are wider and shorter in A. cubensis than in A. marginatus . Finally, the parameres are widened to the rectangular apex, whereas the parameral apex is smoothly rounded in A. marginatus .

Description. Length: 3.0 mm. Colouration: Light reddish; elytra and base of abdominal segments III–VII darker reddish; legs and antennae dark yellow.

Head 0.37 mm long, 0.59 mm wide; small eyes not prominent and as long as temples; lateral margin in sinuate curve from neck to beginning of slightly wider supraocular margin, then evenly rounded in smooth curve to front edge; temples behind eyes with deep netlike microsculpture; vertex with sparse and fine punctation; distance between punctures at least twice as wide as diameter of punctures; between normal punctures with sparse micro-punctation; interstices between punctures partly with extremely weak microsculpture, but surface mostly shiny; with row of supraocular setiferous punctures; on each side, with long seta on line between posterior edge of eyes; interstice between setae nearly 10 times wider than distance of setae to eyes.

Antennae nearly as long as head and pronotum combined; first antennomere thick, more or less rectangular, and as long as second and third combined; second antennomere globular; third triangular; antennomeres 4 to 6 more or less quadrate; antennomeres 7 to 10 wider than long and with apical crown of short bristles; all antennomeres with apical setae.

Pronotum 0.56 mm long, 0.78 mm wide; widest in anterior half; slightly narrowed to obtusely rounded anterior angles; evenly narrowed to posterior angles; anterior angles slightly prominent; thus, front edge slightly emarginate; lateral margin distinct; beginning at posterior angles and ending at front edge including anterior angles; posterior edge not margined; punctation sparse and fine, still sparser than on head, but slightly deeper; interstices between punctures irregularly wide, but on average more than twice as wide as diameter of punctures; with sparse micro-punctation; surface without microsculpture; polished and shiny; setiferous punctures in lateral margin and at anterior edge.

Elytra 0.62 mm long, 0.82 mm wide; with distinct rectangular shoulders and slightly prominent tooth; disc with weak coriaceous ground sculpture and irregularly coarse punctation; punctures on average larger than on pronotum.

Abdomen with netlike microsculpture and moderately dense punctation; punctures distinctly coarser than on pronotum and head; tergite X widened to apex and with numerous pores; sternite X with uplifted central part at apex; apical edge of that part emarginate and with long setae.

Aedeagus with rectangular central lobe ending in obtuse apex; parameres slightly longer than central lobe; widened to apex; with more or less rectangular angles at apex.

Etymology. The specific name refers to the country of Cuba.

Distribution. This species is known from Granma and Santiago de Cuba provinces, Cuba, in the Sierra Maestra mountain range.

Figures

Figs 1–4: Morphological details of Cuban Osoriinae. 1 – Allotrochus cubensis sp. nov.; 2 – Nacaeus dejectus (Sharp, 1887); 3 – Thoracophorus cubensis sp. nov.; 4 – Antillosorius martini sp. nov. Body parts: A – aedeagus in lateral/ ventral aspect; B – paramere; C – last abdominal tergite; D – last abdominal sternite; E – antenna; F – protibia in posterior aspect. Scale bars: 0.1 mm.

Fig. 5. Head, pronotum and elytra, showing shape, punctation and microsculpture. A – Allotrochus cubensis sp. nov.; B – Thoracophorus brevicristatus Horn, 1871; C – T. guadalupensis Cameron, 1913; D – T. cubensis sp. nov.; E – Espeson moratus Schaufuss, 1882; F – Nacaeus planellus (Sharp, 1887). Scale bars: 0.2 mm (A–E), 0.5 mm (F).