Camelobaetidius juparana, Boldrini & Pes & Francischetti & Salles, 2012

Boldrini, R., Pes, A. M. O., Francischetti, C. N. & Salles, F. F., 2012, New species and new records of Camelobaetidius Demoulin, 1966 (Ephemeroptera: Baetidae) from Southeastern Brazil, Zootaxa 3526, pp. 17-30 : 23-24

Camelobaetidius juparana sp. nov. Boldrini & Salles

(Figs. 11; 13–22)

Diagnoses. Nymphs: 1) Segment II of labial palp with distomedial projection robust and rounded (Fig. 18); 2) bifid thoracic gill present at the base of forecoxa (Fig. 19a); 3) tarsal claws with 23–29 denticles (Fig. 19b); 4) paraproct without spines (Fig. 22); 5) terminal filament as long as cerci.

Comments. Camelobaetidius juparana sp. nov. is possibly closely related to C. hamadae Salles & Serrão, 2005 another species in which the nymphs present a bifid thoracic gill at the base of the forecoxa and a paraproct without spines. It is easily distinguished from C. hamadae by the number of setae on the dorsal margin of labrum, 10 versus 32 in C. hamadae ; by the shape of the hypopharynx, superlingua with distal margin oblique versus truncated in C. hamadae , and lingua subequal in length to superlingua versus superlingua shorter than lingua in C. hamadae ; by the number of denticles on tarsal claws, 23–29 denticles versus 36–37 denticles in C. hamadae ; and by the shape of the spines on posterior margin of terga IV: it is truncate in C. juparana sp. nov., and in C. hamadae this spines are triangular.

Description

Nymph. Length of body: 2.9–3.5 mm; length of antennae: 1.3 mm; length of cerci: 1.7 mm; length of terminal filament: 1.4 mm; tibia I: 0.5 mm; tibia II: 0.5 mm; tibia III: 0.4 mm.

Head (Fig. 11). Light brown. Antennae light brown, with scape and pedicel subcilindrical. Lateral branch of epicranial suture straight.

Labrum (Fig. 13). Subrectangular, broader than long. Length about 0.6× maximum width; lateral margin with long, fine and simple setae; anterolateral margin with long, fine and pectinate setae; medially with short, robust, pectinate setae. Dorsally with seven shorts, fine, simple setae scattered over basal area; dorsolateral arc of setae with a row 10 long, fine and apically pointed setae.

Left mandible (Fig. 14). Prostheca robust, apically denticulate. Margin between prostheca and mola straight with a row of spine-like setae; subtriangular process narrow and produced; tuft of setae at apex of mola absent. Basal half bare.

Right mandible (Fig. 15). Prostheca slender, apically denticulate; margin between prostheca and mola straight, with two spine-like setae; tuft of spine-like setae at base of mola present; tuft of setae at apex of mola present. Basal half bare.

Hypopharynx (Fig. 16). Lingua subequal in length to superlingua; apex rounded, with tuft of short, fine, simple setae. Superlingua not expanded with fine, apex truncated obliquely, simple setae scattered over lateral and distal margin.

Maxilla (Fig. 17). Crown of galea-lacinia with four denticles; inner dorsal row of setae with two denti-setae. Medial protuberance of galea with 1 + 2 long, fine, simple setae. Maxillary palp 1.3× length of galea-lacinia.

Labium (Fig. 18a). Glossa narrow and subequal in length to paraglossa; inner margin with six spine-like setae increasing in length distally; apex with one long, spine-like setae; outer margin with three long, spine-like setae; ventral surface with one short, fine, simple setae on anteromedian area. Paraglossa sub-rectangular, curved inward; apex with two rows of long, fine, pectinate setae (Fig. 18b); ventral surface bare; dorsal surface with three robust, simple setae near apex. Labial palp with segment I subequal in length of segments II and III combined; outer margin of segment I with short, simple setae near apex; segment II with distomedial protuberance robust and rounded, with simple setae over lateral and ventral area; dorsally with a row of three fine, spine-like setae; segment III rounded, length 0.7× width, scattered with fine, simple setae, and fine, spine-like setae.

Thorax (Fig. 11). Light brown with marks brown; metanotum light brown washed with brown. Hind wing pad present. Bifid thoracic gill (Fig. 19a) present at the base of forecoxa. Femur light brown with a medial brown mark, and with dorsal surface and apex brown; tibia light brown with base and apex brown, tarsi light brown washed with brown. Tibia I, II and III subequal in length of the respective femur; tarsi I about 0.7× in length of femur; tarsi II and III about 0.5× in length of the respective femur.

Forefemur (Fig. 19a). Length about 2.2× maximum width; dorsally with row of c.a. 40 long, spine-like setae; length of setae 0.3× width of femur; ventrally with short, spine-like setae. Foretibia (Fig. 19a). Dorsally with row of short, fine, simple setae; ventrally with few, short, spine-like setae; anterior surface with a row of long, fine, simple setae; tibio - patelar suture present, 0.6× in length of tibia. Foretarsi (Fig. 19b). Dorsally and ventrally with short, fine, simple setae; ventrally with five spine-like setae, increasing in length toward apex, and one long, fine, simple setae near apex. Tarsal claws (Fig. 19b) with 23–29 denticles.

Abdomen (Fig. 11). Light brown; segments I, III and VI washed with brown, and anterior margin of the segment VII washed with brown; segments III and VI with distinct median and lateral brown marks. Terga IV with surface creased (Fig. 20); posterior margin with truncate spines. Gills IV (Fig. 21a). Light brown; margins with narrow spine intercalating short, fine, simple setae; tracheae pigmented (Fig. 21b), extended from main trunk. Gills oval. Gill I 0.5× length of segment II; gill IV 2.1× length of segment V; gill VII 0.9× length of segment VIII.

Paraproct (Fig. 22). Without spines near on inner margin; surface with fine, simple setae, without shagreened area; postero-lateral extension with rounded marginal spines. Cerci light brown; outer and inner margin of the terminal filament and inner margin of the cerci with tufts of long, simple setae.

Etymology: The specific epithet juparana is a reference to Lagoa Juparanã, one of Brazilian largest lakes. The São José River, where the species has been found, is the main tributary of Lagoa Juparanã.

Distribution. BRAZIL: Espírito Santo, Minas Gerais.

Material examined. Holotype: One nymph, BRAZIL, Espírito Santo, Sooretama, Rio São José , 19°07'33.1"S / 40°14'261"W, 4.x.2010, 24 m, Boldrini, R., Salles, F.F. & Nascimento, J.M.C. leg ( CZNC).

Paratypes: One nymph mounted in slides, same data holotype ( CNZC) . One nymph, same data holotype ( CNZC) . One nymph, same data holotype ( INPA) . Three nymphs mounted in slides, same data holotype, except 9.ix.2010 ( INPA) . One nymph mounted on slides, Minas Gerais, Pingo D´Agua, Rio Sacramento , 19º49’S / 42º18’W, 29.x.2005, Francischetti, C.N. & Salles, F.F. leg ( CZNC) .