Erythraella bicuspidata, Zoia, 2012

Zoia, Stefano, 2012, Eumolpinae (Coleoptera: Chrysomelidae) of Socotra Island, Insect biodiversity of the Socotra Archipelago (Acta Entomologica Musei Nationalis Pragae 52), pp. 449-501 : 475-476

Erythraella bicuspidata sp. nov.

( Figs. 76–83 , 131–132 , 144 )

Type locality. Yemen, Socotra Island, Zemhon area, 12°30.58′N, 54°06.39′E.

Type material. HOLOTYPE: J, ‘ Yemen, Socotra Isl., Zemhon area , 270-300 m, N 12°30,58′, E 054°06,39′, 16.- 17.6.2010, V.Hula leg. [printed white label] ; Holotypus Erythraella n.gen. bicuspidata n. sp. S. Zoia det.2012 [printed red label]’ ( NMPC). PARATYPES (2 spec.): ‘ Yemen, Socotra Island, Dixam plateau, 15.+ 22.vi.2012, wadi Dirhor, open woodland with Boswellia ameero trees, 12°28.0′N, 54°00.5′E, 340 m, Socotra expedition 2012, J. Bezděk, J. Hájek, V. Hula, P. Kment, I. Malenovský, J. Niedobová & L. Purchart leg.’ (1 J JBCB; 1 J SZCM) .

Description. Body length of holotype 3.5 mm, of paratypes 3.0 mm, 3.6 mm. Habitus as in Figs. 131–132 .

Body black, not metallic; head reddish; in holotype, pronotum reddish with median oblong blackish spot, hypomerae blackish, elytra blackish with proximal border, suture anteriorly, humeri and epipleura reddish; in paratypes, pronotum, hypomerae and elytra largely reddish; labrum, palpi and mandibles reddish; antennomeres I–VI reddish, antennomere VII darkened distally, antennomeres VIII–XI black; legs reddish, tarsi somewhat darkened distally.

Frons ( Fig. 82 ) almost flat, with median thin longitudinal sulcus, moderately strong punctures and relatively long translucid pubescence; clypeus almost bare, feebly convex and punctured between antennae, concave and without punctures distally. Palpomere II short, transverse, nearly one third of palpomere I in length, palpomere III conical, somewhat thinner than II and nearly twice as long. Antennomere I less than two times longer than wide, nearly twice as long as II; antennomere II nearly as long as wide; antennomere III twice as long as II, three times longer than wide; antennomeres IV and V subequal to III and longer than VI; antennomeres VII–X moderately widened, VII longer than VI, VIII–X one third shorter than VII and nearly 1.5 times longer than wide; antennomere XI 1.5 times longer than X and as wide ( Fig. 81 ).

Pronotum 1.2 times wider than long (1.2 × 1.0 mm in holotype), at base nearly as wide as at distal border; sides with only trace of margin, regularly arched if seen from above, widest shortly behind midlength; surface strongly and confusedly punctate; punctures close to each other but not confluent, surface between punctures smooth and shiny; pubescence long, fine, semiadpressed, with feeble golden reflections.

Scutellum longer than wide, subtriangular, pubescent.

Hypomeron punctured throughout, with moderately long pubescence; prosternum ( Fig. 83 ) oblong, nearly 2.5 times longer than wide between the coxae, somewhat transversely prominent medially, punctured, scarcely pubescent; coxal cavities wide, equally distant from front and posterior border of prosternum; mesoventrite between mesocoxae as wide as prosternum between procoxae, punctured, bare, with deeply concave distal border; metaventrite not punctured, bare in middle, with few fine setae on sides, distal border almost straight between metacoxae which are slightly more spaced than mesocoxae; mesepimera almost bare; metanepisterna four times longer than wide, finely pubescent.

Elytra oblong, 1.5 times longer than wide at humeri (2.3 × 1.5 mm), weakly impressed in basal fifth; sides subparallel up to distal third, then regularly curved to apices, forming slightly acute angle; humeri prominent, concealing elytral sides in dorsal view; punctation strong, also on apical slope, arranged in 11 longitudinal regular rows; pubescence of interstriae long, erect and with weak golden reflections. Epipleura gradually tapering from base to elytral apices, with single row of short setae.

Legs long; profemora swollen ( Fig. 81 ), clearly wider than meso– and metafemora; femora with small, acute, median tooth; pro– and mesotibiae feebly bent, metatibiae straight; protarsomere I slightly narrower than protarsomere II, both slightly wider than long; apical tarsomere nearly twice the III in length. Claws bifid from near their base, with inner tooth shorter.

Dorsal side of abdomen poorly sclerotized, with exception of pygidium which is nearly 1.7 times wider than long and not grooved. First abdominal ventrite with moderately strong punctation, 2nd to 5th gradually more finely punctured and with fine whitish setae.

Aedeagus as in Figs. 76–78 .

Female unknown.

Etymology. The Latin name refers to the double point of the apex of aedeagus.

Figures

Figs. 76–83. Erythraella bicuspidata gen. et sp. nov. (J holotype): 76 – aedeagus, dorsal view; 77 – aedeagus, apex, ventral view; 78 – aedeagus, lateral view; 79 – tegmen; 80 – ventral sclerite of sternite IX; 81 – fore leg and antenna; 82 – head; 83 – prosternum.

Figs. 129–138. Habitus, dorsal and lateral view of: 129–130 – Colasposoma (Colasposoma) hajeki sp. nov.(Jholotype); 131–132 – Erythraella bicuspidata gen. et sp. nov. (J holotype); 133–134 – Macrocoma niedobovae sp. nov. (J holotype); 135–136 – Macrocoma bezdeki sp. nov. (J holotype); 137–138 – M. hulai sp. nov. (J holotype).

Figs. 139–144. Distribution maps of the species based on the studied material (in Fig. 142, question marks indicate a possible montane form of C. (C.) brevepilosum sensu lato, see species description).