Tulcus santossilvai, Pérez-Flores & Nearns, 2021

Pérez-Flores, Oscar & Nearns, Eugenio H., 2021, Two new species of Onciderini Thomson, 1860 (Cerambycidae: Lamiinae) from Mexico and Honduras, Zootaxa 5026 (1), pp. 145-150 : 148-150

Tulcus santossilvai sp. nov.

Figure 2 (A–D)

http://zoobank.org/ urn:lsid:zoobank.org:act:ED3211D7-5A44-4A0B-8F5C-C1C9ABC04B89

Description. Holotype female. Integument mostly reddish-brown. Frons, antennal tubercles, apex of mandibles, scape (dorsally), humeri, and coxae dark brown. Clypeus orange anteriorly. Abdomen dark reddish-brown centrally.

Head. Frons elongate; finely, shallowly punctated; with scarce, pale yellow pubescence, yellower centrally and laterally; with glabrous median groove. Vertex and area behind upper eye lobes with pale yellow pubescence, except glabrous median groove and some irregular areas close to eyes. Area behind lower eye lobes finely, sparsely punctate, with dense pale yellow pubescence. Genae slightly shorter than lower eye lobe; with scarce, pale yellow pubescence, except glabrous apex. Postclypeus finely, somewhat sparsely punctate; with scattered, yellow pubescence on wide central area, with long, erect bright yellow setae interspersed centrally and laterally. Labrum coplanar with anteclypeus at posterior half, oblique and somewhat depressed at anterior half; with pale yellow pubescence on posterior half, and long, bright yellow setae on anterior half. Antennal tubercles abruptly elevated, with inner apex forming moderately elevated horn with acute apex; pubescence mostly pale yellow, yellower on some areas. Gulamentum finely punctate; glabrous except short, sparse pale yellow pubescence on intermaxillary process. Area of connection of eye lobes 0.5 times width of upper eye lobe. Distance between upper eye lobes 0.23 times length of scape; in frontal view, distance between lower eye lobes 0.47 length of scape. Antennae 1.32 times elytral length, just reaching elytral apex at antennomere XI. Scape and antennomeres III–XI with pale yellow pubescence, and long, pale yellow (brown toward apex) erect setae on inner side of scape and antennomeres III–IX; antennomere III slightly sinuous. Antennal formula (ratio) based on length of antennomere III: scape = 0.80; pedicel = 0.16; IV = 0.72; V = 0.48; VI = 0.40; VII = 0.36; VIII = 0.31; IX = 0.30; X = 0.29; XI = 0.28.

Thorax. Prothorax transverse and sub-conical, wider posteriorly, 1.34 wider than long; sides without gibbosities or small protuberance. Pronotum with five gibbosities, a central one, elongate on posterior half; other one on either side of first one, rounded on anterior half; two more laterally, oblique, elongate about middle; coarsely, sparsely punctate on base of lateral tubercles and gibbosities, smooth on remaining surface; with interspersed orange and pale yellow pubescence, and long, erect brownish-yellow setae. Anterior and posterior margins of pronotum furrowed centrally. Prosternum with abundant pale yellow pubescence laterally, and almost glabrous centrally. Prosternal process wide, arcuate posteriorly; with scarce yellow pubescence. Mesoventrite with dense pale yellow pubescence, scarcer toward mesoventral process. Mesanepisternum, mesepimeron, metanepisternum, and metaventrite with dense interspersed yellow and yellowish-white pubescence. Scutellum with pale yellow pubescence on sides, glabrous on anterior third and longitudinal band centrally. Elytra. 4.58 times as long as prothoracic length; coarsely, deeply punctate on anterior third, shallower and smaller toward apex; with a transverse gibbosity on first third, close to elytral suture; humerus with prominent, arcuate anterior margin, angle with large, oblique tubercle, truncate at apex; with yellowish-orange pubescence, and some whitish pubescence interspersed. Legs. Femora pedunculate, widened toward apex; meso- and metafemora narrower basally; tibiae slightly expanded apically; with dense, interspersed yellow and pale yellow pubescence; trochanters with a long brownish-yellow setae ventrally; inner face of femora, tibiae and tarsi with long, scattered bright yellow setae. Protibiae with golden tuft of setae ventroapically; meso- and metatibiae dorso- and ventroapically. Metatarsomere I 0.74 times II–III together.

Abdomen. Ventrites with pale yellow pubescence, yellow on apex; with two patches, of thick, short whitishyellow setae; ventrite V with long, erect yellowish setae; apex of ventrite V nearly truncate, widely emarginated centrally.

Dimensions (mm), female holotype. Total length, 12.35; prothoracic length, 2.40; anterior prothoracic width, 2.28; posterior prothoracic width, 2.90; humeral width, 5.0; elytral length, 9.10.

Type material. Holotype female labeled. “ MEXICO: Oaxaca, San Miguel Chimalapa, San Antonio, Camino al mirador, 26-Julio-2017, 16.6641° N, - 94.2345° W, 1760msnm, luz aditivos metálicos, 11 PM, bosque mesófilo de montaña, O. Pérez col.” ( CNIN).

Etymology. This species is named in honor of Antonio Santos-Silva (Museu de Zoologia - MZUSP, São Paulo, Brazil) for his devotion and contribution to knowledge of Neotropical Cerambycidae . The epithet is a noun in the genitive case.

Diagnosis and remarks. One other species of Tulcus is known from Mexico, T. lycimnius ( Dillon & Dillon, 1945) . Tulcus santossilvai sp. nov. can be separated from T. lycimnius by base of elytra coarsely, deeply punctate on anterior third (finely punctate in T. lycimnius ) and by the humeral angle with large tubercle which is obliquely truncate at apex (humeral angle with rounded, glabrous apex in T. lycimnius ). This species is described from a single female, and nothing is known about its biology.

Figures

FIGURE 2. A–D) Tulcus santossilvai sp. nov., holotype female: a) Dorsal habitus; b) Lateral habitus; d) Head, frontal view; e) Abdominal ventrites.