Camelobaetidius cruzi, Boldrini, R. & Pes, A. M. O., 2014

Boldrini, R. & Pes, A. M. O., 2014, Five new species of Camelobaetidius Demoulin, 1966 (Ephemeroptera: Baetidae), and redescription of Camelobaetidius mexicanus (Traver & Edmunds, 1968), Zootaxa 3796 (3), pp. 545-567 : 554-557

Camelobaetidius cruzi sp. nov. Boldrini

( Figs. 3 ; 28–37)

Diagnose. 1) Labrum narrowly rounded anteriorly ( Fig. 28 ); 2) segment II of labial palp with a short rounded distomedial projection ( Fig. 33 ); 3) thoracic gill absent at the base of coxae; 4) tarsal claws with 13 denticles ( Fig. 34 a); 5) posterior margin of terga with rounded spines ( Fig. 35 ).

Description. Nymph. Length: 2.8–3.2 mm; length of antennae: broken; length of cerci: 1.3 mm; length of terminal filament: 1.1 mm; tibia I: 0.3–04 mm; tibia II: 0.3 mm; tibia III: 0.3 mm.

Head ( Fig. 3 ). Light brown. Antennae light brown. Lateral branch of epicranial suture straight.

Labrum ( Fig. 28 ). Narrowly rounded anteriorly. Length about 0.8× maximum width; anterolateral margin with long, fine, bifid setae, anterior margin with fine, bifid and pectinate setae. Dorsally with two short, fine, simple setae over basal area; dorsolateral arc of setae with two long, fine and apically pointed setae on lateral region.

Left mandible ( Fig. 29 ). Incisors with seven denticles. Prostheca robust, apically denticulate. Margin between prostheca and mola with three short, spine-like setae; subtriangular process wide; setae at apex of mola absent. Basal half with three fine, simple setae.

Right mandible ( Fig. 30 ). Incisors with seven denticles. Prostheca slender, apically denticulate; margin between prostheca and mola with one short spine-like seta; setae at apex of mola present. Basal half without setae.

Hypopharynx ( Fig. 31 ). Lingua shorter than superlingua, apex rounded with tuft of short, fine, simple setae. Superlingua rounded, with fine, simple setae on distal margin.

Maxilla ( Fig. 32 ). Inner dorsal row of setae with two pectinate denti-setae, apical denti-seta at the same orientation of canines. Medial protuberance of galea with 1 + 3 long, fine simple setae. Maxillary palp 1.4× length of galea-lacinia.

Labium ( Fig. 33 ). Glossa shorter than paraglossa; inner margin with seven fine, simple setae; apex with two long, fine setae; outer margin with three long fine setae; ventral surface with three short, fine, simple setae. Paraglossa sub-rectangular; apex with two rows of long, fine setae; ventral surface with four long, fine, simple setae ( Fig. 33 a); dorsal surface with three fine, simple setae near apex. Labial palp segment II with distomedial projection short and rounded; dorsally with a row of two long, fine, spine-like setae. Segment III sub-quadrangular, length 0.8× width, scattered with spine-like setae.

Thorax ( Fig. 3 ). Light brown; mesonotum with posterior region brown. Legs light brown. Hind wing pad present. Thoracic gill absent at the base of coxae. Tibia I 0.7× length of femur I, tibia II 0.8× length of femur II, and tibia III 0.7× length of femur III; tarsi I 0.6x in length of femur I, tarsi II 0.6× length of femur II, and tarsi III 0.5× length of femur III.

Forefemur ( Fig. 34 ). Length about 3.2× maximum width; dorsally with row of c.a. nine spine-like setae increasing in length distally; ventrally with two short, spine-like setae. Foretibia. With one spine-like setae at apex; patella-tibial suture present, 0.5× length of tibia. Foretarsi. Ventrally with short, fine, simple setae and one short, spine-like setae near apex. Tarsal claws ( Fig. 34 a) with 13 denticles. Mid femur. Length about 2.7× maximum width; dorsally with row of c.a. eight long, spine-like setae. Hind femur 2.4× maximum width; dorsally with row of c.a. six long, spine-like setae.

Abdomen ( Fig. 3 ). Light brown; posterolateral corners of segments II and III and segments V and VI washed with brown, middle region of segments III and VI with a brown mark. Terga not creased, smooth, posterior margin of tergum IV with rounded spines ( Fig. 35 ). Gills IV ( Fig. 36 ) light brown; tracheae pigmented. Paraproct ( Fig. 37 ). With two spines near inner margin; surface smooth, without shagreened area; postero-lateral extension smooth. Cerci light brown; outer and inner margin of terminal filament and inner margin of the cerci with tufts of long, simple setae.

Etymology: The name of the species is in honor of Paulo Vilela Cruz, who collected the nymphs of this species.

Distribution. BRAZIL: Mato Grosso do Sul.

Comments. The general shape of labial palp ( Fig. 33 ), the number of denticles on the tarsal claws ( Fig. 34 a) and the body color pattern ( Fig. 3 ) of the new species are similar to those found in C. matilei ( Fig. 4 ). Camelobaetidius cruzi sp. nov., however, is distinguished from C. matilei by the presence of hind wing pad.

Material examined. Holotype: Nymph (mounted on slides, medium Euparal), BRAZIL, Mato Grosso do Sul, Bonito, balneário municipal de Jardim, Rio Prata, 21°25'04.3"S / 56°23'24.0"W, 15.iii.2012, Cruz, P.V. leg ( INPA). Paratype: Two nymphs (mounted on slides, medium Euparal), same data as holotype, (one in CZNC and one in UFRR).

Figures

FIGURES 1 – 4. Camelobaetidius, nymphs (d. v.). 1, C. baumgardneri sp. nov. 2, C. carolinae sp. nov. 3, C. cruzi sp. nov. 4, C. matilei.

FIGURES 28 – 33. Camelobaetidius cruzi sp. nov., nymph. 28, labrum (left v. v., right d. v.). 29, left mandible. 30, right mandible. 31, hypopharynx. 32, maxilla. 33, Labium (left v. v., right d. v.).

FIGURES 34 – 37. Camelobaetidius cruzi sp. nov., nymph. 34, foreleg. 34 a, detail of tarsal claw. 35, posterior margin of terga IV. 36, gill IV. 37, paraproct.