Micranops bolivianus Guzman & Żyła, 2024

Guzman, Yoan Camilo & Żyła, Dagmara, 2024, A New Eyeless Species of Micranops Cameron 1913 from Bolivia (Coleoptera: Staphylinidae: Paederinae), Neotropical Entomology 53 (1), pp. 154-161 : 156-158

Micranops bolivianus Guzman & Żyła sp. nov.

Figures 1a–i ; 2 a–f ; Online Resource 1.

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Diagnosis. M. bolivianus Guzman & Żyła sp. nov. differs from other Neotropical Micranops by the lack of eyes (eyes in M. brunneus are rudimentary, but still present). In the structure of the aedeagus, it resembles M. surinamensis , but the apex of the ventral process is wide and blunt, while in M. bolivianus Guzman & Żyła sp. nov., it is thinner and pointy. From all eyeless species worldwide, it resembles M. mlejneki Frisch and Oromí, 2006 in the structure of aedeagus. It differs by the ventral process thin and longer than the median lobe ( Fig. 1 d–i ), while in M. mlejneki ventral process is thick and short, not exceeding the median lobe (figs 5–10 in Frisch and Oromí 2006).

Etymology The species name is derived from the country of the species type locality— Bolivia. An adjective.

Material examined. HOLOTYPE BOLIVIA; ♂; “ M. bolivianus Guzman and Żyła 2023 HOLOTYPE [red label] \\ BOL/ Nov2013 /09 BOLIVIA 2013, SANTA CRUZ dep., Comarapa, W Amboro NP Siberia pass env., 2450 m, 28.xi.; S17°50′12.0" W64°42′08.0" Sifting litter Winkler app extr.; P. Baňař lgt.; \\ COLLECTION; P. BAŇAŘ; Moravian Museum Brno”. ( UASC) ; PARATYPES BOLIVIA; 5 ♂; 2 ♀; PARATYPE [yellow label] \\ ♀; “ BOL/ Nov2013 /12 BOLIVIA 2013 SANTA CRUZ dep., W Amboro NP Barrientos, 1813 m, 29.xi.; S18°06′0.6" W63°48′08.0" Winkler app. extr.; P. Baňař lgt. \\ COLLECTION; P. BAŇAŘ; Moravian Museum Brno”; 5 ♂ and 1 ♀; same data as for holotype. (3 ♂, 1 ♀ MMBC; 1 ♀ UASC; 1 ♂ JJRC; 1 ♂ ZMH) .

Description

Measurements (n = 1, Holotype), FBL (1.16), H (0.38, 0.33), A (0.62), a1 (0.09, 0.06), a2 (0.07, 0.04), a3 (0.05, 0.03), a4 (0.05, 0.03), a5 (0.05, 0.04), a6 (0.05, 0.04), a7 (0.05, 0.04), a8 (0.04, 0.04), a9 (0.05, 0.05), a10 (0.04, 0.05), a11 (0.07, 0.06), NKW (0.12), GL (0.04), P (0.4, 0.3), E (ext 0.3, int. 0.22, 0.32), AB (1.3), PC (0.2, 0.07), PF (0.3, 0.14), PT (0.2, 0.05), MSC (0.15, 0.08); MSF (0.23, 0.8), MST (0.2, 0.04), MTC (0.10, 0.12), MTF (0.3, 0.12), MTT (0.3, 0.04).

Colouration. Unicolourously brown, appendages and labrum lighter, mandibles darker brown.

Body. Total length 2.45 mm, forebody length 1.2 mm ( Fig. 1a ); body surface with dense pubescence and dense isodiametric microsculpture resembling scales ( Fig. 2f ), more notable on head and pronotum.

Head. Head capsule oblong, 1.2 times as long as wide; anterior margin straight, elevated, with two protruding processes above antenna insertion, each process with two thick setae, one long above and one short at sides ( Fig. 1a ). Eyes absent. Gena slightly invaginated anteriorly close to antenna insertion one pair of trichobothria placed on middle of lateral margin, with wavy surface around cavity ( Fig. 2 c–d ), rounded towards posterior margin; posterior margin of head slightly emarginate across neck incision, rounded laterally, with two longer and thicker setae close to posterior angles of head ( Fig. 2e ). Epicranium with scale-like microsculpture, dense setation laterally, scarcer medially. Gula with glabrous surface between gular sutures and dense isodiametric macrosculpture, setation evenly distributed on lateral sides, invagination on anterior margin on both sides of gula sutures. Neck with two central pits joined anteriorly. Antenna moniliform, longer than head, shorter than head and pronotum combined, antennomere 1 as long as antennomeres 2 and 3 combined, antennomeres 2–9 longer than wide, antennomere 10 wider than long, antennomere 11 longer than wide. Mandibles tridentate. Labrum transverse, bilobed, with acute processes on each lobe and deep emargination between lobes. Maxilla, palpomere 1 slightly expanded apically, glabrous; palpomere 2 elongated, widened apically, as long as palpomere 3; palpomere 3 globular, narrowed posteriorly, with setation; palpomere 4 minute, conical and glabrous ( Fig. 2a ). Stipes with three well-developed setae on lateral margin and two at base. Cardo with one central seta. Galea and lacinia with microsculpture. Labium, palpomere 1 quadrate; palpomere 2 longer than 1, slightly wider apically, with setation on distal border; palpomere 3 thin and glabrous. Ligula trilobed, with lobes broad apart; mentum with four central setae, arranged in pairs. Submentum with one seta on each side ( Fig. 2b ).

Thorax. Pronotum 1.3 times longer than wide, with maximum width in middle of length; oval, as long as head, surface covered with setae, disc with longitudinal invagination in middle. Anterior margin strongly convex. Posterior margin truncated. Prosternum with microsculpture, basisternum transverse, without transversal or longitudinal carina (fig 4, Bogri et al. 2020, Online Resource 1, photo with habitus ventral side). Furcasternum with longitudinal carina. Basisternum with microsculpture, transversal carina poorly defined. Metasternum with microsculpture, intercoxal process with one pair of rounded processes. Elytra distinctly shortened, as long as wide, surface shiny, elytron with epipleural ridge; apical angle rounded, costal side longer than anal, fringed with row of setae.

Legs. Procoxa 2.8 times longer than wide; profemur widest at middle, twice as long as wide; protibia with 4 combs, wider combs located distally; protarsomeres 1–4 wider than long, with short and dense setae inner side, bilobed ( Fig. 2f ). Mesocoxa twice as long as wide; mesofemur 3 times longer than wide (0.23, 0.08), mesotibial ctenidium subequal on both sides; mesotarsomeres 1–4 subequal and mesotarsomere 5 longer, elongated and cylindrical. Metacoxa as long as wide; metafemur widest in middle, twice as long as wide; metatibial ctenidium on both sides, inner longer than wide; metatarsomeres 1–4 subequal and 5 longer, elongated and cylindrical.

Male abdomen. With microsculpture, setation short on surface, longer row on anterior margin; tergite III–XII anterior margin straight, tergites IX–XI fused and posterior margin rounded ( Fig. 1c ); sternite VIII with U-shape central emargination about 1/3 of sternite length ( Fig. 1b ).

Aedeagus. Teapot shape; median lobe wider at base, apex with rounded process projecting on parameral side, with scarce micropunctuation ( Fig. 2d ); ventral process thin and longer than median lobe, narrowing towards apex ( Fig. 1 d–i ).

Female abdomen. Usually lack of emargination on abdominal segments, sometimes present, but shallow, always shallower than in male.

Distribution The species is known only from the type locality in Amboró National Park, Comarapa, Santa Cruz province, Bolivia. It was collected at a high altitude of 2450 m.a.s.l. in the locality called “ Siberia ”, a cloudy forest ( Fig. 3 ), by sifting leaf litter and using a Winkler extractor.

Figures

Fig. 1 Micranops bolivianus Guzman & Żyła sp. nov. a Habitus, dorsal. Paratype ♂. Scale bar=1 mm. b–c Scheme of abdominal segments. Scale bar=0.2 mm. b Sternite VIII. c Tergite IX–X, posterior margin. d–i Aedeagus. Holotype, ♂. d–e Scanning electronic micro- graphs. d Lateral view. f–g Photographs. f Lateral view. g Parameral view. h–i Schemes. h Lateral view. i Parameral view. f–i Scale bar=0.25 mm

Fig. 2 Micranops bolivianus Guzman & Żyła sp. nov. a–e Head. a Head ventral view. microsculpture (arrow). b Ligula trilobed (arrow), ventral view. c Trichobothrium on the lateral side, cavity of tricho- bothrium (arrow). d Close-up of trichobothrium, cavity of trichobothrium (arrow). e Poste- rior margin, thick seta (arrow). f Forelegs, bilobed tarsomere 4 (arrow)

Fig. 3 Habitat of Micranops bolivianus Guzman & Żyła sp. nov., Parque Nacional Amboró, Santa Cruz, Santa Cruz de la Sierra. a Cloud forest. b Vegeta- tion in the type locality. Photo credits Petr Baňař