Orthomegas irroratus ( Lameere, 1915 )

Galileo, Maria Helena M., Martins, Ubirajara R. & Santos-Silva, Antonio, 2014, Two new species and one new genus of South American Cerambycidae (Coleoptera), with redescriptions and distributional records for other taxa, Insecta Mundi 2014 (360), pp. 1-14 : 2-4

Orthomegas irroratus ( Lameere, 1915)

( Figures 1–5 )

Callipogon (Orthomegas) irroratus Lameere, 1915: 55 ; 1919: 85.

Callipogon (Orthomegas) irroratum ; Monné and Giesbert, 1994: 8 (checklist); Monné, 1995: 20 (cat.); Monné and Hovore, 2005: 11 (checklist); 2006: 10 (checklist); Monné, 2006: 32 (cat.).

Callipogon irroratum ; Blackwelder, 1946: 553 (checklist).

Orthomegas irroratus ; Audureau, 2012: 66, 74; Bezark and Monné, 2013: 17 (checklist).

Male. Integument dark-brown; elytra dark-reddish brown, slightly lighter toward apex (completely so in the holotype), or lighter along part of suture; genae, mandibles, scape, pedicel, antennomere III, black; antennomere IV dark-brown; antennomeres V slightly lighter than IV or VI slightly lighter than V; antennomeres VI-XI or VII-XI brown.

Head elongated behind eyes (distance between posterior ocular edge and prothorax equal to about width of superior ocular lobe); dorsally finely, densely punctate (slightly coarser between clypeus and posterior ocular margin), except close to the ocular carinae, where the punctures are moderately coarse; longitudinal dorsal furrow distinct from clypeus to after posterior ocular margin, distinctly deeper toward the former; area between clypeus and posterior ocular margin with dense, long, decumbent reddish-yellow setae (longer toward clypeus); area between posterior ocular margin and prothorax with dense, short, decumbent moderately golden setae. Antennal tubercles rounded at apex, coarsely, sparsely punctate, with long, sparse orangish setae (denser near clypeus); distance between bases equal to about length of antennal tubercle. Area behind eyes finely, densely punctate; region behind superior ocular lobe with short, decumbent, moderately dense reddish-yellow setae, longer between superior and inferior lobes; region behind inferior ocular lobe with moderately long, erect, abundant reddish-yellow setae. Clypeus with dense, distinctly long, erect reddish-yellow setae. Gula glossy, almost impunctate, centrally with long, sparse reddish-yellow setae. Submentum depressed; anterior edge distinctly elevated; coarsely, densely punctate (laterally coarser); with long, erect, moderately dense reddish-yellow setae (longer toward mentum). Distance between superior ocular lobes from 0.30 to 0.35 times length of scape; distance between inferior ocular lobes from 0.45 to 0.50 times length of scape. Genae sparsely, moderately coarsely punctate; with short, sparse, decumbent reddish-yellow setae; apex projected, acute. Mandibles about 0.50 times as long as head; dorsal carina forming a distinct tooth at its distal portion, rounded at apex; lateral side coarsely, abundantly punctate, with sparse setae (longer on base); carinae with very long, dense reddish-yellow setae, sparser toward base of tooth; inner side with very long, dense reddish-yellow setae, projected forwards on base, and inwardly on area of tooth; inner margin of left mandible with a large, sub-triangular tooth from about middle to base of distal tooth, truncate at apex; inner margin of right mandible with two large teeth between middle and base of distal tooth, rounded at apex. Antennae nearly attaining distal fourth of elytra; scape glabrous, dorsally coarsely, sparsely punctate (denser on basal third). Antennomere III 1.7 times longer than scape; ventral sensory pit placed at distal sixth, divided by carina, forming two distinct pits, from which the innermost is about 1.4 times longer than the outer. Antennomeres IV-X about 0.5 times as long as III; antennomere XI 0.6 times as long as III.

Prothorax centrally 0.9 times as long as head (excluding mandibles); lateroanterior angles explanate, projected forward, anteriorly rounded, laterally with distinct tooth;lateroposterior angles with long tooth obliquely projected backwards; lateral margin spiny-crenulate, with a distinct tooth near base at lateral third (lateral angle). Pronotum with two distinct gibbosities centrally; laterally coarsely, confluently punctate; area between gibbosities moderately finely, sparsely punctate; area between gibbosities and anterior margin coarsely, abundantly punctate; area between gibbosities and basal margin laterally coarsely, abundantly punctate, centrally finely, sparely punctate; gibbosities finely, densely punctate on outer side, distinctly coarsely, sparsely punctate on inner side; central area (including inner side of gibbosities) with short, sparse golden setae; area between lateral margin and gibbosities (including outer side of gibbosities) with dense, short golden setae (not attaining anterior margin; longer and denser toward base). Prosternum coarsely, abundantly punctate, except on a narrow band at center; with long, abundant reddish-yellow setae. Prosternal process centrally carinate and almost glabrous, laterally with abundant reddish-yellow setae; apex narrowed, attaining mesocoxae. Metasternum laterally finely, densely punctate, distinctly sparser centrally on a triangular area around longitudinal metasternal furrow; with long, abundant reddish-yellow setae. Metespisterna with sculpture and setae as lateral of metasternum. Scutellum with dense, moderately short reddish-yellow setae. Elytra with coriaceous appearance, finely, moderately abundantly punctate; with several moderately small, shallow depressions (nearly all sub-rounded), microsculptured and with short, dense, golden setae (less conspicuous on distal third); sutural apex with short, but distinct spine. Ventrites I-IV laterally microsculptured, centrally glossy, impunctate (on ventrite I only on a triangular area on distal third); area microsculptured with short, abundant golden setae (longer on ventrite I); center-basal region of ventrites II-IV with short, sparse golden setae; ventrites I-IV with short, sparse golden setae on narrow band near center-distal margin. Ventrite V laterally microsculptured, with short, abundant golden setae; centrally with X-like impunctate area (with punctures on distal portion of the “arms” of the “x”); setae on X-like area moderately long, abundant on its “arms” and basal third, almost glabrous on remaining surface. Metatarsus as long as 0.80 times metatibia; metatarsomere V (excluding claws) about as long as I-II together.

Dimensions in mm (male). Total length, 62.7–65.2; length of prothorax at center, 7.8–8.3; width of prothorax between apices of the anterior angles, 13.4–14.4; width of prothorax between apices of the posterior angles, 15.8–16.3; humeral width, 15.3–16.2; elytral length, 45.5–47.2. Dimensions of the holotype (Gérard L. Tavakilian, personal communication): Total length, including mandibles, 53.0; pronotal length, 7.0; elytral length, 39.0.

Remarks. Orthomegas irroratus was described based on a single male from Colombia (Magdalena Valley). Audureau (2012) revised Orthomegas commenting on O. irroratus : “n’ayant pu observer qu’une photographie de l’exemplaire du MNHN, je retranscris la description originale.” We record two additional specimens here from Ecuador.

Based on the photograph of the holotype, it is not possible to see if the sutural elytral apex is spined, however, Gérard L. Tavakilian (pers. comm.) indicates it is so: “Elytres avec une petite épine apicale dirigée vers le bas.”

Material examined. ECUADOR, Loja: Cantón Zappotillo, Bosque seco, Reserva Biológica La Ceiba, 726 m, 2 males, 13.IV.2012, G. Arriagada col. ( MZSP, VMDC).

Figures

Figures 1–5. Orthomegas irroratus, male. 1) Dorsal; 2) Ventral; 3) Lateral; 4) Head and prothorax, dorsal; 5) Head and mandibles, lateral.