Diceroderes ocozocoautlaensis Smith, 2015

Smith, Aaron D. & Cifuentes-Ruiz, Paulina, 2015, Revision of Diceroderes Solier (Coleoptera: Tenebrionidae: Toxicini: Eudysantina), with Descriptions of Four New Species, The Coleopterists Bulletin (mo 14) 69, pp. 55-72 : 63-65

Diceroderes ocozocoautlaensis Smith , new species

( Figs. 7–8 , 23 , 28–31 )

Type Material. HOLOTYPE (male) labeled:

16kmNW Ocozocoautla / 970m. 7.VI.1990 / H. & A. Howden ”; (b) on blue paper “Tenebrionid Base / Aaron D. Smith / Catalog # 14689”; (c) on red paper, “ HOLOTYPE / Diceroderes / ocozocoautlaensis / Smith 2015” ( CMNC). ALLOTYPE (female) labeled: (a) same collecting event as holotype; (b) on blue paper “Tenebrionid Base / Aaron D. Smith / Catalog # 14690”; (c) on red paper, “ALLO- TYPE / Diceroderes / ocozocoautlaensis / Smith 2015” ( CMNC). PARATYPE (female, 1 specimen) labeled: (a) “ MEXICO: Chiapas / Mpio: Villa

Corso , Ejido Sierra / Morena R. Biosfera La Sepultura / 1600m, 16°09′10.6″N, 93°35′25.1″W / 19–20.VII.2005, R. Anderson, / oak-pine ridge forest litter, / 2005-004F”; (b) on blue paper “Tenebrionid Base / Aaron D. Smith / Catalog # 14691”; (c) on yellow paper, “ PARATYPE / Diceroderes / ocozocoautlaensis / Smith2015” ( CMNC) .

Diagnosis. Diceroderes ocozocoautlaensis can be separated from all other known members of the genus based on the following character combination: Frons with low supraorbital costae and deep transverse impression; clypeus with transverse row of tubercles; elytra in lateral view rounded from front to back; males with apical spine on hind tibia only; mentum with medial longitudinal ridge. This species is similar to Diceroderes subtriplehorni , new species, as the only other species with rounded elytra in lateral view. It also has similar male genitalia, but can be separated based on the lack of apical tibial spines on the pro- and mesolegs in male D. ocozocoautlaensis and by the lack of a welldefined transverse anterior ridge on the pronotum, the presence of a medial longitudinal ridge on the mentum, and having the elytra more depressed around the scutellum in D. subtriplehorni .

Description. Male, Holotype. Length 9.1 mm, width 4.5 mm. Color ferruginous to black, each fovea or puncture with 1 decumbent golden seta unless otherwise noted. Head: Frons densely deeply foveate throughout, with low supraorbital ridge, posteriorly with deep transverse impression; vertex raised above frons and densely foveate; frontoclypeal suture deeply and broadly impressed; clypeus with densely tuberculate transverse band and setose, anterior margin nearly straight with sharp raised lip; gena between eye and clypeus raised and densely foveate; shallow impression present around eye from gena to apex. Eye slightly reniform, approximately 5 facets across; large U-shaped moderately shallowly foveate lobe present behind eye. Labrum without transverse medial ridge, semi-erect golden setae present on anterior half, margin rounded with setae along edges of vertical surface; mandible bifid at apex, dorsal and lateral surfaces shagreened and sparsely setose; mentum trapezoidal, with long straight setae near anterolateral margins and short decumbent setae otherwise, widest at anterior margin, posteromedial raised area present, disappearing before anterior margin; submentum small and well-defined, as wide as basal margin of mentum, pentagonal. Antennomeres 9–11 subequal in size; antennomere 3 approximately 1.3X length of antennomere 4, antennomeres 4–8 subequal in length. Prothorax: Pronotal disc almost flat, widest near middle, constricted in basal third; densely foveate, with impunctate medial longitudinal region, tuberculate, each tubercle clothed in microtomentose setae and decumbent setae curved towards apex of tubercle, apex smooth, rounded, and glabrous, occasionally with visible micropit; discal tubercles nearly absent except 2 submedial patches of nearly confluent tubercles and 2 longitudinal ridges running from outer base of horns to near basal margin bearing nearly confluent tubercles; anterior half of pronotum bearing 2 sublateral anteriorly directed horns, horns divergent near base then curved towards midline, dorsal and outer surfaces densely tuberculate and foveate, ventral and inner surfaces densely foveate, apices slightly recurved; pronotum laterally from horn to margin tuberculate and foveate, lateral costa absent, lateral margin with row of regularly spaced tubercles, anterior apices slightly produced and acute, posterior apices acute, not projecting; anterior margin straight, with well-defined transverse costa running entire length, merging with longitudinal costae on underside of horns; posterior margin slightly bisinuate with medial emargination receiving scutellum. Hypomeron densely foveate. Prosternum anterior to coxa approximately as long as coxal cavity, densely foveate, each fovea with a relatively long decumbent golden seta; prosternal process raised between coxa, medially impressed, apex subacute, recurved, and projecting behind coxa. Pterothorax: Dorsal outline oval, widest behind middle. Elytron dorsally convex, gradually sloping at both ends; stria indicated by irregular rows of fovea, interstria with tubercles and somewhat regularly spaced minute decumbent scalelike setae; each elytral disc with weak longitudinal, densely tuberculate, costa near middle; lateral portion of elytron between costae and poorly defined pseudepipleural margin densely tuberculate; pseudepipleura regularly densely foveate, sparsely tuberculate; ventral margin of epiplura with deep groove for reception of abdominal ventrites 3–5. Scutellum with minute decumbent scale-like setae, subtriangular, posterior portion V-shaped, dorsal margin rounded and extending past elytral base, ∼ 1.1X as wide as long. Mesosternum short, anteriorly weakly emarginate behind prosternal process, mesocoxal cavities open. Metasternum short, separating meso- and metacoxal cavities by less than mesocoxal cavity length. All visible ventrites on the pterothorax densely foveate, each fovea with golden seta. Legs: Femora lacking spines or other protrusions, densely shallowly punctate, punctures fine and almost completely obscured by pruinescence, each with 1 decumbent seta; tibia without callosities, clothed in decumbent setae set in fine punctures, inner surface with few spine-like setae, inner apical margin with 2 small socketed spurs, apical spine between spurs present on hind tibia in males; distal tarsomere shorter than combined length of preceding segments, with sparse golden setae, venter of all other tarsomeres clothed with dense long golden setae. Abdomen: Visible ventrites densely finely punctate medially, becoming shallowly foveate on ventrite 5 caudally, each puncture with 1 decumbent seta, relatively clean of pruinescence, lateral margins moderately setose, fine punctures absent or obscured by pruinescence; abdominal intercoxal process broad, anterior margin rounded; intersegmental membranes concealed, connection between ventrites 3–5 deeply medially depressed; ventrite 5 lacking submarginal groove; abdominal defensive reservoirs present; sternite 8 weakly sclerotized and setose, deeply medially emarginate, emargination V-shaped; aedeagus with parameres fused, subequal in length to basal piece, dorsally convex, widest near base then gradually acuminate to thin partly dehisced apical fourth of length, very weakly curved ventrad towards apex ( Figs. 7–8 ).

Female. Similar to male, except lacking apical tibial spines and with shorter, stouter pronotal horns, horns curved towards midline but not recurved at apex ( Figs. 30–31 ).

Distribution. Mexico: Chiapas ( Fig. 23 ).

Etymology. The species epithet refers to the Ocozocoautla region in Chiapas where the holotype and allotype were collected.

Figures

Figs. 3–12. Diceroderes species, aedeagi, dorsal and lateral views. 3–4) D. mexicanus, TB# 14740; 5–6) D. cusucoensis, holotype, TB# 14688; 7–8) D. ocozocoautlaensis, holotype, TB# 14689; 9–10) D. skelleyi, holotype, TB# 13105; 11–12) D. subtriplehorni, holotype, TB# 13109.

Fig. 23. Diceroderes species, distribution map. Triangles = D. mexicanus, white triangles are for morph one, gray/blue triangles for morph two. Stars = D. cusucoensis. Squares = D. ocozocoautlaensis. Diamonds = D. skelleyi. Circles = D. subtriplehorni.

Figs. 28–29. Diceroderes ocozocoautlaensis, holotype (male). 28) Dorsal habitus; 29) Lateral habitus.

Figs. 30–31. Diceroderes ocozocoautlaensis, allotype (female). 30) Dorsal habitus; 31) Lateral habitus.