Marvaldiella truncata, Colonnelli, 2014

Colonnelli, Enzo, 2014, Apionidae, Nanophyidae, Brachyceridae and Curculionidae except Scolytinae (Coleoptera) from Socotra Island, Acta Entomologica Musei Nationalis Pragae 54, pp. 295-422 : 312-313

Marvaldiella truncata sp. nov.

( Figs 12, 14, 15 )

Type material. HOLOTYPE: J ( NMPC), ‘ Yemen, Socotra Island // Dixam plateau // Firmihin ( Dracaena forest) // 12°28.6′N, 54°01.1′E, 490 m // Jiří Hájek leg. 15-16.xi.2010 ’. PARATYPES: 3JJ 2♀♀, same label data as holotype (4 NMPC, 1 ECRI) ; 6JJ 3♀♀, ‘ Socotra Is. ( YE) Dixam plateau // Firmihin ( Dracaena forest) // 12°28.6′N, 54°01.1′E, 490 m // Jan Batelka leg. 15-16.xi.2010 ’ (6 JBPC, 3 ECRI) ; 1 ♀ ‘ Yemen, Soqotra Is. , 2003 // 8-10/xii., Qalansiyah env. // Khayrha mts., N slopes // N 12°38′50″ E 53°27′45″ // 85-592 m [GPS], D. Král lgt.’, ‘ Yemen - Soqotra 2003 // Expedition; Jan Farkač, // Petr Kabátek & David Král’ ( NMPC); 1 ♀, ‘ Yemen, Soqotra Is., // 24-26.xi/2003 // Wadi Ayhaft, 190 m // N 12°36′38″ E 53°58′49″ // [GPS], David Král lgt.’, ‘ Yemen - Soqotra 2003 // Expedition; Jan Farkač, // Petr Kabátek & David Král’ ( NMPC); 4 JJ 4 ♀♀, ‘ Yemen, Socotra Island // Zemhon area, 270- 350 m // N 12°30′58″, E 54°06′39″ // 3-4.ii.2010, at light // L. Purchart & J. Vybíral lgt.᾽ (5 NMPC, 1 BMNH, 2 ECRI); 3 JJ 1 ♀, ‘ Yemen, Socotra Island E // Kesa env., 220-300 m // N 12°39′37″, E 53°26′42″ // 28-29.i.2010, L. Purchart lgt.’ (3 NMPC, 1 ECRI) ; 2 JJ, ‘ Yemen, Soqotra Isl. , Qaariah // vill. env., 28.xi.2003, N 12°38′// 05″ E 54°12′39″, 11 m [GPS] // leg. P. Kabátek’, ‘ Yemen - Soqotra 2003 // Expedition; Jan Farkač, // Petr Kabátek & David Král’ ( NMPC); 2 JJ ‘ Yemen, Soqotra Isl., Wadi // Shederhed, 30.xi.2003, N // 12°36′11″ E 54°08′07″, 290 m // [GPS], leg. P. Kabátek’, ‘ Yemen - Soqotra 2003 // Expedition ; Jan Farkač , // Petr Kabátek & David Král’ ( NMPC) ; 1 J, ‘ Yemen, Soqotra Isl. , Wadi // Ayhaft, 24-26.xi.2003, N 12°// 36′38″ E 53°58′49″, 190 m // [GPS], leg. P. Kabátek’, ‘ Yemen - Soqotra 2003 // Expedition; Jan Farkač, // Petr Kabátek & David Král’ ( NMPC); 1 J, ‘ Yemen, Soqotra Isl., Sirhin area // Dixam plateau, 1-2.xii.2003, N // 12°31′08″ E 53°59′09″, 812 m // [GPS], leg. P. Kabátek’, ‘ Yemen - Soqotra 2003 // Expedition ; Jan Farkač , // Petr Kabátek & David Král’ ( NMPC) ; 2 JJ 5 ♀♀, ‘ Yemen, Soqotra Isl. , Homhil // protected area, 28-29.xi.2003 // N 12°34′27″ E 54°18′32″, 364 // m [GPS], leg. P. Kabátek’, ‘ Yemen - Soqotra 2003 // Expedition ; Jan Farkač , // Petr Kabátek & David Král’ (5 NMPC, 2 ECRI) ; 1 ♀, ‘ Yemen, Socotra Island // road between Airport and Hadiboh // 12°38′27″N 53°58′22″E, // 80 m, 2.vi.2012 // V. Hula & J. Niedobová leg.’ ( NMPC) .

Description. Male holotype. Body length: 5.0 mm. Piceous, shining, bare; antennae, tibiae and tarsi dark ferruginous ( Fig. 12 ).

Head. Rostrum 2.10 times longer than wide, 2.09 times as long as head and 0.61 times as long as pronotum, subcylindrical, barely curved, dorsum quite sparsely minutely punctured. Scrobes thin, almost straight and directed immediately below eyes. Antennae relatively robust; scape short, weakly bisinuate and rather abruptly clubbed on apical half; funicular antennomere I broader than remaining ones and hardly longer than wide; antennomere II subtriangular and little longer than wide; antennomeres III to VII moniliform and progressively more transverse towards club; club large, shortly fusiform and little longer than three preceding antennomeres. Head with rather sparse small punctures, vertex convex, shiny and finely strigose posteriorly to eyes. Space between eyes not sulcate. Eyes small, elliptical and barely protruding from head convexity.

Pronotum 1.07 times longer than wide, hardly constricted at apex; punctation consists of large dense roundish punctures, just little smaller towards apical margin; sides almost straight from base up to apical third, then moderately converging towards apex and barely curved, maximum pronotal width at middle; basal margin hardly convex and clearly wider than truncate apical one. Scutellum large, transverse.

Elytra 1.72 times longer than wide, maximum width at apical third, sides almost straight and hardly converging toward apical declivity, where elytra somewhat subtruncate. Striae sulciform, with large deep subquadrate elongate punctures. Intervals slightly convex, not wider than striae, and with irregular row of rather coarse punctures; interval III dilated and bulging at extreme apex, and here fused with interval IX.

Legs. Femora moderately clubbed; tibiae quite elongate and hardly bisinuous; tarsi very narrow, tarsomere III not bilobed.

Ventral side with dense rather large round punctures; abdominal ventrites I and II shallowly depressed along midline.

Variability. Paratypes are almost identical to the holotype, except some variation of the colour of appendages which is paler in some specimens. Females differ from males only by their rostrum at least 2.25 times longer than wide.

Male genitalia. Aedeagus as depicted in Figs 14 and 15 .

Body length 4.2–5.0 mm.

Differential diagnosis. Large size, peculiar outline of elytral apex, and unusual shape of aedeagus with a central sharp projection ( Figs 12, 14, 15 ) make it impossible to confuse this species with any other so far described congener. This species was illustrated by WRANIK (2003: pl. 178, fig. i) as ‘ Curculionidae , not yet identified’.

Etymology. The species takes its name from the subtruncate apex of its elytra; the Latin adjective truncatus (- a, - um) means cut off, chopped off, or truncate.

Distribution. Endemic to Socotra Island.

Figures

Figs 11–15. 11, 13 – Marvaldiella insularis sp. nov.: 11 – habitus of the holotype in dorsal view; 13 – aedeagus of a paratype in dorsal view. 12, 14–15 – Marvaldiella truncata sp. nov.: 12– habitus of the holotype from above; 14 – aedeagus of a paratype in dorsal view; 15 – the same in side view.