Microibidion morrisi, Santos-Silva, Antonio & Galileo, Maria Helena M., 2017

Santos-Silva, Antonio & Galileo, Maria Helena M., 2017, New species and new synonymy in Neoibidionini (Coleoptera, Cerambycidae), Zootaxa 4286 (2), pp. 291-295 : 291-294

Microibidion morrisi sp. nov.

( Figs. 1–5, 9 )

Description. Male. Head, pro- and mesothorax, pro- and mesofemora black; mouthparts light reddish-brown; antennae brown gradually reddish-brown toward distal segments; metasternum dark brown on base, gradually reddish toward apex; abdominal ventrite I mostly dark brown, II dark brown on base, gradually reddish-brown toward apex, III mostly reddish-brown, IV–V light reddish-brown; metafemora dark brown; tibiae dark brown on base, gradually reddish-brown toward apex; tarsi dark brown (metatarsi lighter); elytra black basally, with large yellowish macula from at about basal sixth to after midlength, dark brown after yellowish macula, gradually reddish-brown toward apex.

Head. Frontal plate tumid, finely, transversely striate, separated from clypeus and area close to lower eyes by distinct sulcus, with transverse, deep sulcus at each side of area close to base of antennal tubercles; glabrous except for some minute setae. Area between antennal tubercles finely, confluently punctate; with minute, sparse, yellowish-white setae. Area between upper eye lobes moderately coarsely, confluently punctate; with minute, sparse yellowish-white setae interspersed with some long, erect, yellowish-white setae. Remaining surface of vertex finely, abundantly, transversely striate; glabrous. Area behind upper eye lobes finely striate (slightly more punctate close to eyes); glabrous. Area behind lower eye lobes minutely, moderately abundant punctate close to eye, sparse toward prothorax; with some long, erect yellowish-white setae close to eye. Postclypeus with one long, erect yellowish-white seta on each side. Distal margin of labrum distinctly concave. Antennal tubercles finely, confluently punctate; with short, decumbent, sparse yellowish-white setae. Submentum transversely striate; with long, erect, sparse yellowish-white setae. Last maxillary and labial palpomere securiform. Upper eye lobes with two rows of ommatidia; distance between upper eye lobes 0.60 times length of scape; distance between lower eye lobes in frontal view 0.65 times length of scape. Antennae 1.75 times elytral length, reaching elytral apex at midlength of antennomere X; scape with some long, erect yellowish setae dorsally and laterally; antennomere III with sparse, long, erect yellowish setae ventrally and at apex; antennomeres IV–X with long, sparse yellowish setae at apex (gradually shorter toward X); antennomere IV with our without one long, erect yellowish seta ventrally; antennal formula (ratio) based on length of antennomere III: scape = 0.83; pedicel = 0.22; IV = 0.68; V = 0.80; VI = 0.80; VII = 0.80; VIII = 0.75; IX = 0.69; X = 0.67; XI = 0.69.

Thorax. Prothorax gradually widened laterally from apex of basal quarter to midlength, then subparallel toward head; 1.3 times longer than wide. Pronotum with five gibbosities, two subcircular on each side of basal quarter, two subelliptical placed on each side between midlength and distal quarter, one longitudinal, subelliptical between basal quarter and midlength, carina-shaped toward distal quarter; basal quarter with inverted V-shaped sulcus; distal quarter with transverse, moderately wide, shallow sulcus; central region shining, moderately coarsely punctate on each side of longitudinal gibbosity; remaining surface, including lateral gibbosities opaque, minutely, densely punctate between lateral gibbosities and between distal lateral gibbosity and distal margin; with decumbent yellowish pubescence not obscuring integument, except glabrous central area, apex of laterobasal gibbosities and nearly all surface of laterodistal gibbosities; with long, erect, sparse yellowish setae on pubescent area. Sides of prothorax closer to pronotum coarsely, abundantly punctate on basal 3/4, sparsely punctate on distal quarter, with decumbent yellowish pubescence, not obscuring integument, interspersed with some long, erect yellowish setae; area closer to prosternum smooth, shiny, glabrous. Prosternum moderately finely, sparsely punctate on basal half (punctures coarser, denser close to procoxal cavities), nearly smooth, glabrous on distal half; with short, decumbent, sparse yellowish setae interspersed with long, erect yellowish setae on basal half. Mesosternum sparsely punctate, nearly glabrous centrally, pubescent laterally. Mesepisternum, mesepimeron and metepisternum pubescent (not obscuring integument). Metasternum finely, moderately sparsely punctate laterally; with decumbent, yellowish setae distinctly exposing integument. Scutellum with brownish pubescence not obscuring integument. Elytra. Coarsely, moderately abundantly punctate on basal half, gradually finer, sparser toward apex; with six rows of long, erect, thick, yellowish-white setae (outermost sparser, two innermost absent on basal third); with short, decumbent, sparse yellowish-white setae between erect setae; apex rounded. Legs. Femora with yellowish-white pubescence not obscuring integument, interspersed with long, erect yellowish setae.

Abdomen. Ventrites minutely, sparsely punctate; with short, decumbent, moderately sparse yellowish-white setae; each ventrite with one long, erect seta on each side of center; ventrites III–V with some other long, erect setae (mainly laterally and mainly on ventrite V); apex of ventrite V truncate, slightly, widely emarginate centrally.

Dimensions (mm), holotype male. Total length, 5.90; prothoracic length, 1.35; basal prothoracic width, 0.85; distal prothoracic width, 0.95; largest prothoracic width, 1.00; humeral width, 1.30; elytral length, 3.90.

Type material. Holotype male from BOLIVIA, Tarija: 2 km SW Villamontes , 13–15.XII.2011, Morris, Wappes & Lingafelter col. ( MNKM).

Etymology. The new species is named for Roy F. Morris II, one of the collectors of the holotype.

Remarks. Microibidion morrisi sp. nov. is similar to M. mimicum Martins, 1971 , but differs as follows: elytral yellowish maculae larger, not L-shaped; metasternum punctate laterally. In M. mimicum the yellowish macula is somewhat smaller and L-shaped, and the metasternum is impunctate. It differs from M. bimaculatum Mehl et al., 2015 ( Fig. 7 ) mainly the elytral erect setae longer and distinctly more abundant, and by the punctures on elytral basal half coarser and sparser ( Fig. 5 ). It can be separated from M. exculptum Martins, 1962 ( Figs. 6, 8 ), by the elytral punctures coarser and somewhat sparser ( Fig. 5 ), and by the mesofemoral club wider ( Figs. 1–3 ).

Figures

FIGURES 1 – 10. 1 – 5, 9, Microibidion morrisi sp. nov., holotype male: 1, dorsal habitus; 2, ventral habitus; 3, lateral habitus; 4, head, frontal view; 5, left elytron; 9, metasternum. 6, 8, Microibidion exculptum, paratype male: 6, mesofemur; 8, left elytron. 7, Microibidion bimaculatum, holotype male, left elytron. 10, Microibidion mimicum, metasternum.