Nealcidion napoensis, Nascimento & Mcclarin, 2018

Nascimento, Francisco E. De L. & Mcclarin, Jim, 2018, New species of Acanthocinini Blanchard, 1845 (Coleoptera, Cerambycidae, Lamiinae) from Ecuador and notes on Parabaryssinus lineaticollis (Gounelle, 1910), Zootaxa 4387 (2), pp. 385-393 : 385-387

Nealcidion napoensis , sp. nov.

( Figs 1–5 )

Holotype male. Integument reddish brown; mouthparts, base of femora and proximal half of tibiae yellowish; genae and extremities of flagellomeres dark brown.

Head. With dense pubescence nearly obscuring integument except glabrous gulamentum. Median groove reaching prothoracic margin; antennal tubercles gradually elevated from median groove. Labial and maxillary palpomere IV fusiform. Upper eye lobes with nine rows of ommatidia. Antennae as long as twice body length; reaching elytral apex at middle of antennomere VII; with abundant pubescence not obscuring integument. Antennal formula (ratio) based on length of antennomere III: scape = 0.85; pedicel =0.08; IV = 0.90; V = 0.80; VI = 0.70; VII = 0.66; VIII =0.68; IX = 0.68; X = 0.60; XI = 0.56.

Thorax. Prothorax 1.45 times wider than long; constricted at posterior half; sides with gibbosities; pronotum with three glabrous tubercles, two transverse at anterior third and one elongate posteriorly; surface with moderately abundant pubescence, except above and behind transverse tubercles. Prosternum with abundant pubescence obscuring integument. Prosternal process one-fifth procoxal cavity diameter. Meso- and metaventrite with abundant pubescence, homogeneously distributed, not obscuring integument. Elytra with lateral carina and two dorsal carinae, confluent at apical fifth; the lateral carinae starting laterally at humeri reaching the external apex, the external dorsal carina starting at dorsal humeral angle, innermost at centrobasal crest; centrobasal crest with short brownish setae; apex obliquely truncate, with elongate external spine and spicule at sutural angle. Elytral pubescence as follows: sub-triangular cream pubescent macula on basal seventh (forming semi-circular macula when considering both elytra); pale cream on basal half between humeral and innermost carinae, interspersed with small brownish spots (cream pubescence darker on median carina, forming dashed spots); brownish on basal half between innermost carina and suture; yellowish white on inverted V-shaped macula placed at about middle, starting on humeral carina, not reaching suture; brownish, gradually pale cream between V-shaped macula and base of distal third; ascending yellowish white pubescent band at distal third, from humeral carina to suture; subelliptical brownish macula at outer side of ascending band of distal third; pale cream interspersed with brownish small, abundant pubescent spots between ascending macula and apex (apex narrowly yellowish white pubescent); area between humeral carina and outer margin with yellowish white pubescence interspersed with brownish areas. Legs with moderately abundant pubescence not obscuring integument; femora pedunculate and abruptly clavate; profemora with peduncle about 1/3 clave length; meso- and metafemora with peduncle subequal to length of clave; apex of protibiae with two spines.

Abdomen with abundant pubescence not obscuring integument.

Dimensions (in mm), holotype male. Total length, 11.3; prothorax length, 1.6; greatest width of prothorax, 2.4; anterior width of prothorax, 2.0; posterior width of prothorax, 2.2; humeral width, 3.4; elytral length, 8.7.

Type material. Holotype male from ECUADOR, Napo: Cosanga , 2100m, 2014-XI-23 J. McClarin leg. ( QCAZ).

Etymology. The name refers to the locality (Napo) where the holotype was collected.

Remarks. The new species belongs to group I ( Bates 1863), which comprises the species of Nealcidion with dorsal carina at elytra. Nealcidion napoensis sp. nov. is similar to N. parallelum (Monné & Martins, 1976) by the elytral color and pubescent pattern, but differs especially by the slender body, apex of protibiae with two evident spines ( Fig. 5 ), and by the external dorsal carina of elytra ending at apical fifth. In N. parallelum , the body is stouter, protibiae have no spines at apex and the external dorsal carina reaches the outer angle of the elytra. The new species also resembles N. sexguttatum Monné & Delfino, 1986 , by the slender body, similar elytral color pattern, and by the external dorsal carina of elytra ending to apical fifth. However, the new species can be distinguished by the shape of the scape, shorter and slightly widened toward apex, widened apex of flagellomeres, prothorax with length 0.65 times its width, and elytral apex with spicule at sutural angle and outer angle with spine. In N. sexguttatum , the scape is longer and slender, the flagellomeres are not widened at apex, the prothoracic length is 0.75 times its width, sutural angle has no spicule and the outer angle is triangularly projected.

Figures

FIGURES 1–5. Nealcidion napoensis sp. nov., holotype, male: 1, dorsal view; 2, ventral view; 3, lateral view; 4, frontalview; 5, detail of protibia.