Cylloepus terzanii, Monte, Cinzia & Mascagni, Alessandro, 2012

Monte, Cinzia & Mascagni, Alessandro, 2012, Review of the Elmidae of Ecuador with the description of ten new species (Coleoptera: Elmidae), Zootaxa 3342, pp. 1-38 : 16-17

Cylloepus terzanii sp. nov.

( Figs. 22–27 )

Diagnosis. Head with round coarse granules. Pronotum with a Y-shaped ridge on the posterior half. Elytra with sublateral carinae on the sixth and eighth interstria, outer reaching the declivity of elytra, inner almost to apical third. Intervals faintly convex except the third one which is weakly carinate at base for a very short distance. Elytral surface finely punctuated, with sparse round granules at basal third, slightly rugose area between punctuations.

Description. Holotype: Male ( Figs. 22, 24, 25, 26, 27 ). Total length 3.5 mm, greatest width 1.3 mm. Body elongate, with sub-parallel sides, moderately convex.

Color ( Figs. 22, 23 ): Cuticle glossy, entirely black or black with longitudinal elytral maculae reddish-brown; mouth-parts, first two antennal articles and tarsi reddish-brown in both the chromatic forms.

Head: Partly retractable, without distinct impressions. Surface granulated with round coarse granules; area between granules rugose with fine sparse golden setae. Eyes protruding laterally; separated by a distance about twice the eye-width. Antennae 11-segmented, filiform; first two basal articles thicker than the remaining ones; articles 7–10 with golden setae on the distal lateral margin; apical article long with cluster of apical setae. Clypeus sub-rectangular and short, the front-clypeal suture very shallow; surface sculptured like the head. Labrum short and with anterolateral portions with some moderately long golden setae; surface glossy.

Thorax: Pronotum very slightly wider than long (1.0 mm and 0.9 mm, respectively), anterior width less than posterior width; anterior margin convex; sides moderately convex in the middle, lateral margins slightly but fairly regularly crenate with anterior angles produced and acute with apex blunted, posterior ones almost right-angled; base tri-sinuate. Sublateral carinae extending from base to anterior margin, depressed at about midlength, elevated and broad in posterior half of pronotum. Discal area moderately convex on the posterior half, mainly when viewed laterally, inclined forwards in the front half. Disc with median longitudinal groove extending from almost anterior margin where it is very shallow, to almost mid-pronotum where it is deeper and large. Disc in front of the scutellum with the sides of the median groove forming at every side a narrow, convex ridge which in the caudal portion of the groove converging with that of the opposite side to forms a narrow, convex sightly elevated ridge that is not reaching the posterior margin of the pronotum. This last ridge together with the ones at the sides of the groove forms an elevated Y-shape. Surface towards the base between the sublateral carinae and the Y-shaped ridge with a large oblique depression followed by a small sub-round elevation. Surface of disc and the sub-round elevations and coarsely punctuated, each punctuation with a long golden seta in the middle, while the pronotal base is glossy and smooth with sparse punctuations. Elytra more than twice as long as pronotum; nearly parallel-sided and regularly crenated; anterior margin convex; humeral angles broadly rounded; apex slightly produced and broadly rounded. Each elytra with nine coarse striae formed by a row of well separated large punctuations diminishing in size towards apex. Sublateral carinae on the sixth and eighth interstria, outer reaching the declivity of elytra, inner almost to apical third. Intervals faintly convex except the third one which is weakly carinate at base for a very short distance. Elyral surface finely punctuated but with sparse round granules at basal third, slightly rugose area between punctuations. Scutellum obovate, longer than wide, flat and glossy with apex slightly acute. Prosternum ( Fig. 24 ) distinctly produced anteriorly, anterior two-thirds slightly bent downwards in lateral view; sublateral carinae indistinct; surface tomentose granulated, each granules with a long golden seta; prosternal process slightly longer than wide, with apex acute; surface with dense coarse granules. Hypomera wrinkled. Mesoventrite deeply grooved medially for the reception of the prosternal process; narrower anteriorly, largely rounded behind. Metaventrite with a longitudinal medial groove, deeper and larger at its posterior edge; surface of disc and sides, completely tomentose, with coarse, oblong granules, each one with a long golden seta. Legs thin ( Fig. 25 ), covered by dense oblong granules, each one with a long golden seta. Protibiae and metatibiae with a single lateral fringe of tomentum. Mesotibiae with two fringes of tomentum, the ventral one about half than lateral one.

Abdomen: First ventrite with short carinae, extending almost to its midlength; surface of the disc, adjacent to carinae, smooth with some coarse granules and punctuations, each one with a fine golden seta; remaining part of the ventrite with oblong coarse granules, each one with fine golden seta. Ventrites 2–3 with a narrow longitudinal band at middle, smooth and glossy with some punctuations; rest of ventrites with dense, coarse, oblong granules. Ventrites 4–5 like 2–3 but without a mid narrow longitudinal band. Ventrite 5 with lateral margins slightly produced; surface of all ventrites entirely tomentose.

Genitalia: Parameres as long as median lobe. Parameres in dorsal view ( Fig. 26 ) wide, narrow and rounded at apex; lateral margins largely rounded; internal margins almost aligned for a large distance then curved at apex; base oblique and largely rounded at internal angles; apex rounded and slightly bent inwards. Parameres in lateral view ( Fig. 27 ) slightly wider at base, which is anterolaterally very developed and narrow towards phallobase; apex rounded and slightly bent downwards. Median lobe in dorsal view ( Fig. 26 ) wide, narrower at sub-acute apex; basolateral apophyses short. Median lobe in lateral view ( Fig. 27 ) apically digitiform. Phallobase ( Figs. 26, 27 ) asymmetrical, longer than it is wide, wider than parameres at base.

Female. All morphological characters as in male.

Intraspecific variation. Size range (n = 57): total length 3.5–4.0 mm, greatest width 1.3–1.5 mm. The elytral cuticles of the examined specimens vary in colour from pure black to black with reddish-brown markings consisting of a stout longitudinal band between the second and third intervals, and between the fifth and sixth; the inner shorter than the outer, nearly reaching the elytral declivity ( Figs. 22, 23 ).

Type locality. Ecuador: Cotopaxi, S. Francisco de Las Pampas, Bosque Integral Otonga.

Type series. Holotype: Male, Ecuador, Cotopaxi, S. Francisco de Las Pampas, Bosque Integral Otonga, Rio Esmeraldas, 1500–1600 m, F. Cianferoni, G. Mazza, C. Monte, M. Pazmiño, C. Tapia & F. Terzani leg., 26.VI.2009 ( MZUF Collection number 15630). Paratypes: 20 specimens, same data as holotype ( MZUF), 10 specimens, same data as holotype ( MSNM); 13 specimens, same data as holotype ( QCAZ); 8 specimens, same data as holotype (CMF), 5 specimens, same data as holotype ( CMS).

Etymology. Dedicated to our friend and colleague, the odonatologist Fabio Terzani (MZUF) for his help during the entomological research.

Comparative notes. Cylloepus terzanii sp. nov. is closely related to Cylloepus sculpticollis Deleve, 1968 , from Ecuador, from which it can be distinguished by the pronotal sub-round elevations and coarsely punctuated instead of finely and sparsely punctuated with areas between punctuations very smooth and glossy; by the less extensive of the reddish-brown bands, in the chromatic forms not entirely black; by the different shape of male genitalia.

Figures

FIGURES 22 – 27. Cylloepus terzanii sp. nov. 22) Holotype, dorsal habitus (total length: 3.5 mm.). 23) Paratype, dorsal habitus (total length: 3.7 mm.). 24) Detail of prosternum, x 300, scale bar 50 µm. 25) Detail of the anterior leg, x 1.400, scale bar 10 µm. 26) Male genitalia, dorsal view. 27) Male genitalia, lateral view. (total length of the male genitalia: 0.82 mm.).