Elytroleptus nigripennis Bates, 1885

GRZYMALA, TRACI L. & MILLER, KELLY B., 2013, Taxonomic Revision and Phylogenetic Analysis of the Genus Elytroleptus Dugés (Coleoptera: Cerambycidae: Cerambycinae: Trachyderini), Zootaxa 3659 (1), pp. 1-62 : 36-37

Elytroleptus nigripennis Bates, 1885

(Figs. 13, 37)

Elytroleptus nigripennis Bates 1885: 318 ; Aurivillius, 1912: 456; Blackwelder, 1946: 588; Linsley, 1961a: 10; 1962b: 8; Chemsak & Linsley, 1965: 195; 1975: 110; 1982: 57; Chemsak et al., 1992: 83; Monné & Giesbert, 1995: 148; Noguera & Chemsak, 1996: 402; Monné, 2005: 605; Monné & Hovore, 2006: 143.

Type locality. Mexico, Oaxaca .

Type information. Holotype. Elytroleptus nigripennis ( BMNH, ♀) labeled: ‘Type/ Oaxaca Mexico. Salle Coll./B.C.A., Col. V. Elytroleptus nigripennis Bates / Elytroleptus nigripennis Bates’

Diagnosis. This species is distinguished from all other species of Elytroleptus by the following combination of characters: 1) elytra laterally expanded apically, greatest width>1.5 × humeral angle width, 2) elytra concolorous black, 3) each elytron with 5–6 punctures between suture and costa I medially, and 4) central pronotal disc densely pubescent. This species most closely resembles E. quadricostatus and can be distinguished by the concolorous black elytra instead of bicolored testaceous and black and the central pronotal disc covered in dense, black pubescence instead of thin pubescence.

Description. Female. TL 12.3 mm, GW 4.7 mm. Body elongate, expanded apically from humeri, dorsoventrally flattened.

Head. HL 0.6 mm, HW 1.5 mm, DBA 0.7 mm, DLE 0.9 mm. Black, except anteclypeus, labrum apex, apex of maxillary palp, apex of labial palp, and vertex with triangular area testaceous. Finely punctate with long, sparse, suberect to erect, black pubescence, more dense, appressed, and testaceous on vertex; gular region glabrous; rugose posterior to lower eye lobe. Antennal tubercles moderately raised, subtriangular, and separated by approximate width of four antennal sockets. Genal apices generally rounded, width ½ × height. Eyes moderately large, finely faceted, lower lobe with 35 facets at greatest height; integument ventral to lower lobe about 0.2 × eye height; deeply emarginate, with 2 facets at greatest emargination point. Antennae black; extending to approximately 2/5 elytral length, scape and antennomere V subequal, pedicel about 1/3 × scape length; antennomeres III and IV subequal, each 3 × length of pedicel; antennomeres V–VIII decreasing in length; antennomeres VIII and IX subequal; antennomere X shorter than IX; antennomere XI subequal to VI, slightly appendiculate.

Thorax. PL 1.7 mm, PW 2.4 mm. Pronotum piceous, width slightly greater than length, apical width subequal to basal width, lateral margins subangulate, widest medially. Pronotal disc shining, punctate, with short, dense,

recumbent, black pubescence on basal 2/3, testaceous on apical 1/3, arising from punctation; laterad to center, two (one on each side) distinct longitudinal, arcuate lines of dense, appressed, testaceous pubescence overlying testaceous integument and extending to lateral margins; punctation on central pronotal disc deep, individual punctures small and varying in diameter and shape, majority not strongly delimited; pronotal disc flat to slightly convex; sides impressed in dorsal aspect, margin apparently elevated, calli absent. Pro-, meso-, and metasternum black, shining, with sparse, suberect to erect, black setae. Scutellum piceous, small, subtriangular, length subequal to width, medially impressed, with short, moderately dense, recumbent black pubescence.

Wings. EL 10 mm. Elytron piceous. About 6 × PL, width at humeral angles about 1.1 × PW. Elytra laterally expanded apically, greatest width>1.5 × width at humeral angle. Elytron with 4 distinct costae; from suture, costa I arising from anterior margin and extending to 3/5 elytral length, costa II arising from anterior margin and extending to 4/5 elytral length, costa III more indistinct than others and extending from about 2/5 posterior to middle of anterior margin to 4/5 elytral length, costa IV arising from humeral angle and extending to 4/5 elytral length; elytron with distinct, deep punctation, 5–6 punctures medially between suture and costa I, increasingly shallow apically, decreasing in diameter basally between scutellar apex and costa I; elytron with moderate, short, suberect to recumbent, black pubescence, one seta per puncture, outer elytral margins with pubescence more dense. Metathoracic wing completely darkly tinted.

Abdominal Sternites. Piceous with violaceous cast, shining; finely punctate, covered in sparse, short, suberect, black pubescence. Legs. Piceous. Femora and tibia covered in sparse, erect, black pubescence, tarsal pubescence suberect to recumbent and more dense. Metatibia straight, not strongly sinuate. Genitalia. Not examined for this species.

Phylogenetic relationship. This species is sister to E. quadricostatus supported by the homoplasious character of the pronotal punctation differing in diameter and most punctures not strongly delimited (Character 8) ( Figs. 31 , 32 ).

Distribution. Mexico (Oaxaca) ( Fig. 37 ).

Natural history. Flight period unknown. The proposed lycid model for this species is Lycus sordidus Gorham (Linsley, 1961a) .

Material examined. The holotype specimen was examined for this species.

Figures

FIGURE 31. Three of six most parsimonious trees retrieved from phylogenetic analysis of Elytroleptus (L = 59, CI = 50, RI = 75). Numbers above branches are characters and numbers below branches are character states. Characters are optimized for

FIGURE 32. Strict consensus for six most parsimonious cladograms resulting from cladistic analysis of Elytroleptus. Numbers above branches are Bremer support values.

FIGURE 37. Distribution map for Elytroleptus nigripennis, Elytroleptus pallidus, and Elytroleptus quadricostatus.