Clitobius obesus ( Waterhouse, 1881 ) Purchart & Kamiński, 2017

Purchart, Luboš & Kamiński, Marcin Jan, 2017, A taxonomic review of the genus Clitobius with description of a new species from Oman (Coleoptera: Tenebrionidae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 57, pp. 139-163 : 144-146

Clitobius obesus ( Waterhouse, 1881) comb. nov.

( Figs 1A , 2A–C , 3C–D, 4)

Apithesis obesa Waterhouse, 1881: 477 (original description; with figure of habitus). GAHAN (1903): 280 (redescription; with figure of habitus); GEBIEN (1940): 781 [588] (catalogue); KOCH (1970): 115 (discussion); SCHAWALLER (2004): 455 (new records); LÖBL et al. 2008: 302 (catalogue).

Clitobius pseudalatus Koch 1960: 391 (original description), syn. nov.

Type material. Apithesis obesa Waterhouse, 1881 . SYNTYPES: 1 unsexed spec. ( BMNH): Type // Socotra / 81.51 // Apithesis / obesus / (Type) Waterh.; 1 unsexed spec. ( BMNH): Socotra / 81.51 .

Clitobius pseudalatus Koch 1960 . PARATYPE, sex undetermined ( ZSMG), labelled: CARIN / IX.1959 / C. KOCH // Paratypus / Clitobius / pseudalatus / C. Koch sp. n.

Additional material examined. (45 spec.), labelled: YEMEN, Socotra Island / Halla area , Arher / freshwater spring in sand dune / 9-10. + 15.vi.2012 / 12°33.0′N, 54°27.6′, 5m // SOCOTRA expedition 2012 / J. Bezděk, J. Hájek, V. Hula, / P. Kment, I. Malenovský, / J. Niedobová & L. Purchart leg. (35 spec.; LPCB, MIIZ, NMPC) ; YEMEN, SOCOTRA Island / Deiqub cave env. / 10.vi.2010 / V.Hula & J. Niedobová leg. (1 spec.; LPCB) ; YEMEN, SOCOTRA Island / DEIQUB cave, 12.vi.2012 / cave & Croton socotranus + / Jatropha unicostata shrubland / 12°23.1′N, 54°00.9′E, 115 m // SOCOTRA expedition 2012 / J. Bezděk, J. Hájek, V. Hula, / P. Kment, I. Malenovský, / J. Niedobová & L. Purchart leg. (6 spec.; LPCB, NMPC) ; Yemen, Soqotra Is. / GUBBAH vill. env. / 23.xi.2003, 7 m / N 12°36′35′′ E 53°46′56′′ / [GPS], David Král lgt. // YEMEN - SOQOTRA 2003 / Expedition ; Jan Farkač , Petr Kabátek & David Král (1 spec.; NMPC) ; same as previous but Jan Farkač lgt. (1 spec.; CULS) ; Zoologische Excursion / Hadibo / März 1999 / leg. Wranik (1 spec.; NMPC) ; Yemen: Soqotra Archipelago / Samha I., under stones along wadi / near village / 12°10.392′N 53°00.919′E / 9.II.2000, leg. S Taiti & R. Argano (1 ♀; MZSF) .

Redescription. Body length = 5.6–7.4 mm (n = 25). Habitus as in Fig. 1A .

Dorsal side of head dull, with fine, but often merging punctures. Frontoclypeal suture extremely fine. Canthus rounded in basal part. Clypeal emargination relatively shallow (clypeal emargination width / depth ratio ca. 9.0). Labrum wide (width / length ratio ca. 1.9); delicately emarginated in middle. Sides of mentum subparallel. Mentum with median keel; lateral wings directed towards body front; not covering cardines or basistipites. Submentum pentagonal. Apical maxillary palpomere trapezoidal; with relatively large sensory field (occupying whole proximal edge). Maxillary palpomere II elongated (length to width ratio ca. 3.0). Palpifer with bunch of setae located near base. Anterior tentorial pits circular. Dorsally eye not shielded by longitudinal keel. Eye partly divided by canthus (three rows of ocelli visible between canthus and gena); ventral portion contains slightly more ocelli than dorsal one. Antenna relatively long (length of antenna / maximal length of pronotum ca. 1.3); antennomere III slender (ratio of its length to length of antennomere II ca. 1.4); antennomeres VIII–XI forming a loosely joined club.

Pronotum narrower than elytra (width ratio elytra / pronotum ca. 1.1). Length to width ratio of pronotal disc ca. 0.6. Pronotal disc dull; with conspicuous microsculpture (magnification 40×); covered with fine and shallow punctures (1–2 diameters apart); covered with short and extremely fine setae. Lateral sides of pronotal disc rounded; widest in basal third; without apophyseal depressions. Lateral emargination of pronotum narrow and complete; basal emargination complete (clearly visible, relatively broad); anterior emargination slightly interrupted in middle. Middle of prosternum and basal part of hypomeron covered with coarse setae. The latter structure flattened near lateral edges. Intercoxal process of prosternum slightly depressed apically (lateral view). Procoxae situated closely (width ratio of procoxa and intercoxal process ca. 1.4).

Elytra dull; glabrous. Elytral striae impressed on their whole length, visible as nine rows of conspicuous punctures on each elytron (1–2 diameters apart). Intervals convex, with fine punctures (2–3 diameters apart). Elytral base sinusoidal; not emarginate. Epipleuron straight in most of its length, terminating at level of abdominal ventrite V; situated ventrally, only basal part visible in dorsal aspect near elytral slope. Elytral humerus obtuse. Scutellum relatively large; triangular. Metathoracic wings reduced (Fig. 3D).

Mesoventrite without processes. Metaventrite relatively elongated (length ratio cavity of metacoxa / metaventrite between insertions of meso- and metacoxae ca. 0.9); without processes, however in apical part slightly elevated; with median carina reaching base of elevated part. Process of abdominal ventrite I narrow and sharp (ratio of distances between meso- and metacoxae ca. 0.5). Abdominal ventrite V not bordered.

Protrochanters of opatrinoid type (with elongated base). Meso- and metatrochanters only slightly covered by respective femora. Metacoxa elongated. Male and female tarsi, tibiae and femora simple.

Aedeagal tegmen as in Fig. 1A . Parameres evenly narrowing towards apex. Clavae absent. Penis basally covered by fused parameres. Ovipositor with paraprocts equal in length to coxites. Paraproct does not shield valvifer and other lobes (directed basally). Valvifer wide and short; third and fourth lobes of coxities elongated. Gonostylus situated laterally. Vagina and bursa copulatrix without sclerites. Spiculum ventrale short.

Distribution. Somalia, Yemen (Samha Island, Socotra) ( Fig. 4 ).

Fig. 3. Diagnostic characters of Falsocaedius and Clitobius . A–B – Falsocaedius fossulatus ( Escalera, 1914) ;► C–D – Clitobius obesus ( Waterhouse, 1881) ; E–F – C. grandis Fairmaire, 1896 ; G–I – C. ovatus ( Erichson, 1843) ; H – C. oblongiusculus ( Fairmaire, 1875) . Abbreviations: a – interrupted basal margination of pronotum;

b – straight pronotal base; c–d – long setae on body sides; e – finely marked elytral rows; f – saddle-like tip of prosternal process (lateral view); g – angular tip of prosternal process (lateral view); h – reduced metathoracic wing; i – bi-sinuate base of pronotum; j – sulcate-punctate elytral rows; k – complete margination of pronotal base;

l – rounded posterior angle of pronotal disc; m – sharp posterior angle of pronotal disc.

Figures

Fig. 1. Clitobius obesus (Waterhouse, 1881) (A) and C. omanicus sp. nov. (B). Habitus (dorsal view) and aedeagal tegmen (lateral view).

Fig. 2. Detailed morphology of Clitobius obesus (Waterhouse, 1881) (A–C, F) and C. omanicus sp. nov. (D, E, G). Abbreviations: a – trochanter base; b – femur base; c – rounded posterior angle of pronotal disc; d – not depressed sides of pronotal disc; e – convex intervals; f – ventral; g – dorsal; h – lateral view.

Fig. 4. Analysed localities and potential distribution of Clitobius ovatus (Erichson, 1843) (A) and C. oblongiusculus (Fairmaire, 1875) (B). Average AUC and habitat suitability threshold values for each analysis are presented.