Cylloepus bartolozzii, 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 : 4-7

Cylloepus bartolozzii sp. nov.

( Figs. 1–6 )

Diagnosis. Pronotal disc granulated, remaining surface less granulated smooth and glossy. Elytra with sublateral carinae on the sixth and eighth interstria, outer reaching the declivity of elytra, inner ending slightly before. Intervals slightly convex except the third one which is strongly carinate in the basal third and the fifth one very slightly convex for a short distance. Presence in the anterior half of the second ventrite, of a little smooth depression, delimited on both sides by a small sub-round elevation with apical hairs directed towards that depression. Protibia with an evident excavation about at the middle of the inner lateral margin, covered by a single lateral fringe of tomentum; ventral surface with a row of small teeth from base almost to the tip. Mesotibia with two fringes of tomentum, the ventral one shorter than the lateral one; latero-ventral margin with a row of small teeth extending from about mid-tibia almost to the tip. Metatibia as protibia but without row of fine teeth on the ventral surface. Male genitalia with median lobe shorter than parameres.

Description. Holotype: Male ( Figs. 1–6 ). Total length 3.3 mm, greatest width 1.2 mm. Body elongate, with sub-parallel sides, moderately convex.

Color ( Fig. 1 ): Cuticle glossy, dark-brown with mouth-parts, first two basal antennal articles and tarsi reddishbrown.

Head: Partly retractable, without distinct impressions. Surface finely and irregularly granulated, with fine and sparse golden setae. Eyes protruding laterally; separated by a distance about one and half times the eye-width. Antennae 11-segmented, filiform; first two basal articles thicker than the following six; last four articles with setae on distal lateral margin; apical article long with cluster of apical setae. Clypeus sub-rectangular, with the frontclypeal suture superficial; surface granulated like on head and with dense long golden setae. Labrum short with dense long golden setae on the apical half, glossy basally.

Thorax: Pronotum very slightly longer than wide (0.9 mm and 0.8 mm, respectively), anterior width less than posterior width; anterior margin convex; sides slightly convex in the posterior half, lateral margin slightly but fairly regularly crenate with anterior angles produced and acute, posterior ones almost right-angled; base tri-sinuate. Sublateral carinae extending from base to anterior margin, moderately elevated and sinuate mainly on basal third. Disc with median longitudinal groove extending from distal third to the base and is deeper and broader at middle, narrower towards the base. Disc in front of scutellum on basal third with sides of median groove forming two slightly prominent median ridges slightly diverging at base. Surface towards the base between the sublateral carinae and the median ridges with a slightly oblique depression followed behind by a small obovate elevation. Surface of disc granulated, each granule with a long golden seta; remaining surface of pronotum less granulate, while the internal margin of the sublateral carinae, the pronotal base, and area between the lateral margins and the sublateral carinae are smooth and glossy. Elytra ( Fig. 2 ) more than twice as long as pronotum; nearly parallelsided; sides slightly sinuate at anterior third; anterior margin convex; humeral angles broadly rounded and elevated; apex moderately produced and broadly rounded. Each elytra with ten coarse sub-parallel striae, ninth and tenth stria not distinct and mutually confluent. Each stria formed by a row of well separated punctuations diminishing in size towards apex. Sublateral carinae on the sixth and eighth interstria, outer reaching the declivity of elytra, inner ending slightly before. Intervals slightly convex except the third one which is strongly carinate in the basal third. Elytral surface covered by little granules each one with a long golden seta. Scutellum obovate, longer than wide, flat and glossy with sparse little granules. Prosternum distinctly produced anteriorly, in lateral view with the anterior two-thirds bent moderately downwards; sublateral carinae indistinct, limited to basal fourth; surface coarsely irregularly rugose and granulose; prosternal process slightly longer than wide, slightly depressed, with sides very slightly elevated and with apex sub-angulate; surface as prosternum. Hypomera very sparsely granulate and glossy. Mesoventrite deeply grooved medially for the reception of the prosternal process; narrower anteriorly, largely rounded behind. Metaventrite with a large and deep longitudinal medial groove running for its entire length; disc of metaventrite completely tomentose, broadly and shallowly concave on either side of its median groove; surface irregularly rugose and coarsely granulated, sides of metaventrite tomentose with sparse granules. Legs thin, covered by dense and round granules, each one with a long golden seta. Hind coxae with a little depression. Legs with one fringe of tomentum on protibiae and metatibiae and two fringes on mesotibiae. Protibia with an evident excavation about at the middle of the inner lateral margin, covered by a single lateral fringe of tomentum, extending from mid-tibia almost to the tip; ventral surface with a row of small teeth from base almost to the tip. Mesotibia ( Fig. 3 ) with two fringes of tomentum, the ventral one shorter than the lateral one, which extending from mid-tibia almost to the tip; latero-ventral margin with a row of small teeth extending from about mid-tibia almost to the tip. Metatibia as protibia but without row of fine teeth on the ventral surface.

A bdomen: First ventrite deeply depressed medially, surface of anterior half of this depressed area glossy with a few round granules; sublateral carinae prominent extending to posterior margin, rest of ventrite entirely tomentose. Second ventrite with a little smooth medial depression on the anterior half, delimited on both sides by a small round elevation with apical hairs directed towards that depression, sparse and round granules laterally, each one with a long golden seta; rest of surface tomentose with sparse granules. Ventrites three to five with little granules, each one with a long golden seta, rest of surface tomentose. Ventrites 4–5 with lateral margins slightly produced posterolaterad. Last ventrite ( Fig. 4 ) with a medial depression at apical margin delimited by very long golden setae.

Genitalia: Parameres longer than median lobe, in dorsal view ( Fig. 5 ) wider at base than at apex; base largely rounded with internal angle sub-acute; apex rounded and slightly bent downwards ( Fig. 6 ). Median lobe in dorsal view ( Fig. 5 ) short, very large, sub-pentagonal and with apex sub-acute basally, strongly constricted medially, slen- der and with blunt apex apically; basolateral apophyses slender with acute apex. Median lobe in lateral view ( Fig. 6 ) with apex slightly bent downwards. Phallobase asymmetrical ( Figs. 5, 6 ).

Female. Morphology like males except for the absence of the excavation on the protibiae and metatibiae, the absence of teeth on the protibiae and mesotibiae, the lack of the two small round elevations on the second ventrite, which is simply convex.

Intraspecific variation. Size range (n = 47): total length 2.9–3.4 mm, greatest width 1.1–1.3 mm. The specimens examined do not show significant morphological variability.

Type locality. Ecuador, Napo, Yasuní National Park.

Type series. Holotype: Male, Ecuador, Napo, Yasuní National Park, 300 m, A. Sforzi & L. Bartolozzi leg., 9–17.VIII.2000, at light ( MZUF Collection number 15622). Paratypes: 4 males, 12 females, same data as holotype ( MZUF); 1 male, 4 females, same data ( MSNM); 3 males, 4 females, same data ( QCAZ); 1 male, 1 female, same data (CMF); 1 male, 1 female, same data ( CMS). Paratypes: 1 male, 4 female, Ecuador, Napo, Yasuní National Park, 300 m, G. Onore leg., 29.III.1997 ( MZUF); 2 females, same locality and data ( MSNM); 1 male, same locality and data (CMF); Paratypes: 1 male, 3 females, Ecuador, Napo, Yasuní National Park, PUCE (Pontificia Universidad Católica del Ecuador) Scientific Station, 300 m, G. Onore leg., 1.IV.1997 ( QCAZ); 2 females, same locality and data ( MZUF).

Etymology. This species is dedicated to our colleague and friend Luca Bartolozzi, Head of the Zoology Section (MZUF), who collected this new Elmidae .

Comparative notes. Cylloepus bartolozzii sp. nov. is closely related to Cylloepus sexualis Hinton, 1937 from Mexico, however it can be distinguished by the following: pronotal disc granulated instead of punctuated; the fifth interval very slightly convex for a short distance instead of strongly convex; the presence, in the anterior half of the second ventrite, of a little smooth depression, delimited on both sides by a small sub-round elevation with apical hairs directed towards that depression; the different shape of male genitalia, which have shorter median lobe, shorter than parameres; and the differently shaped parameres.

Figures

FIGURES 1 – 6. Cylloepus bartolozzii sp. nov. 1) Holotype, dorsal habitus (total length: 3.3 mm). 2) Detail of the anterior portion of elytra, x 37, scale bar 500 µm. 3) Right mesotibia with row of small teeth, x 37, scale bar 500 µm. 4) Fifth abdominal ventrite (length: 0.4 mm, width: 0.6 mm). 5) Male genitalia, dorsal view. 6) Male genitalia, lateral view (total length of the male genitalia: 0.48 mm).