Diochus newtoni, Irmler, 2017

Irmler, Ulrich, 2017, A review of the Neotropical genus Diochus ERICHSON, 1840 (Coleoptera: Staphylinidae: Staphylininae), Beiträge Zur Entomologie = Contributions to Entomology 67 (1), pp. 1-62 : 14-15

Diochus newtoni spec. nov.

urn:lsid:zoobank.org:act:FD5C80C7-1C1E-4C8C-9D48-8FEC23D9365F

Figs 19A–C , 38K , 42G

Type material: male, Holotype: Panama: Panama Prov., Cerro Campano , 3200 ft. elev., Berlese, cloud forest leaf litter, 14., 23.2.1976, leg. A. Newton ( FMNH).

Paratypes: 3 males, 4 females with same data as holotype ( FMNH, UIC) .

Diagnosis: Regarding the overall shape of the aedeagus, D. newtoni is closely related to D. schuelkei . The paramere is nearly identical to that of D. schuelkei , except the structure of the lateral triangular process, which is straightly upright in D. schuelkei , but curved and spoon-like in D. newtoni . Furthermore, colouration of D. newtoni is brown, whereas it is nearly black in D. schuelkei . It can be easily identified by the extremely small eyes from all other species of the group. The eyes are still smaller than those of D. inornatus .

Description: Length: 4.7 mm. Colouration: dark brown, legs and antennae light brown.

Head: 0.60 mm long, 0.50 mm wide; eyes small; not prominent; EL: HL 0.15; temples five times as long as eyes; distinctly divergent to posterior angles; PW: EW = 1.30, posterior margin curved; posterior angles obtuse; setiferous punctures deep, wide midline impunctate; along midline with line of five to six setiferous punctures; laterad with dense punctation; without microsculpture; surface shiny.

Antennae as long as head and half of pronotum combined; first antennomere elongate; nearly as long as second and third antennomere combined; second and thrid antennomere conical; nearly twice as long as apical width; antennomeres four and five quadrate; following antennomere wider than long; eighth antennomere 1.5 times as wide as long; all antennomeres with moderately long stetae at apex; all antennomeres exept first antennomere pubscent.

Pronotum: 0.74 mm long, 0.58 mm wide; sides aproximately parallel; anterior margin widely rounded; without distinct anterior angles; posterior margin shortly rounded with weak obtuse angles; lateral margin extremely fine; in dorsal aspect nearly invisible; setiferous punctures deep; along wide impunctate midline with three pairs of punctures in anterior half; interstice between anterior pair nearly twice as wide as between posterior pairs; few more punctures laterad; along lateral margin several punctures; wihtout microsculpture; surface polished.

Elytra: 0.65 mm long, 0.71 mm wide; sides posteriorly divergent; widest at posterior margin; shoulders obtusely rounded; deep setiferous punctation in four irregular lines; four lines on disc; first line at suture with 7 to 8 punctures; along lateral margin with several long setae; with moderately deep coriaceous ground sculpture; surface less shiny than head and pronotum.

Abdomen with dense pubescence.

Aedeagus with thick seminal vesical; 0.6 times as long as total length of central lobe; basal inner duct looped; ending in wide funnel-like structure with apical forceps; filamentous apical duct forming one coil; parameres projecting central lobe; with two long setae at apex; laterad with trinagular process; process apically widened to irregular spoon-like structure; shaft with few sensillae at base. Spermatheca 0.26 mm long; 0.11 mm wide; bursa copulatrix in asymmetric position to coild duct; coiled duct oval; shoe-like.

Etymology: The species is named to honour the tremendous work of Alfred Newton, Chicago, USA, for the knowledge of the Neotropical Staphylinidae .

Figures

Figs 42: Fore-bodies of Diochus antennalis (A), D. tricolor (B), D. amazonensis (C), D. hermani (D), D. plaumanni (E), D. hibbsi (F), D. newtoni (G), D. novus (H); scale bar: 0.5 mm.

Figs 18–21: Diochus inornatus-group: D. plaumanni (18), D. newtoni (19) and Diochus maculicollis-group: D. brooksi (20), D. ecuadoriensis (21); aedeagus (A), paramere (B) and antenna (C); scale bar: A, B: 0.1 mm, C: 0.2 mm.

Fig. 38: Spermathecae of Diochus longicornis-group: D. longicornis (A), D. tarsalis (B), D. ashei (C), D. guianensis (D), D. unicolor (E); Diochus inornatus-group: D. inornatus (F), D. hanagarthi (G), D. antennalis (lateral aspect H), D. hermani (I), D. hibbsi (J), D. newtoni (K), D. novus (L); scale bar: 0.1 mm.