Five new species of Camelobaetidius Demoulin, 1966 (Ephemeroptera: Baetidae), and redescription of Camelobaetidius mexicanus (Traver & Edmunds, 1968) Author Boldrini, R. Author Pes, A. M. O. text Zootaxa 2014 3796 3 545 567 journal article 45740 10.11646/zootaxa.3796.3.8 e6f90dd2-610e-4278-8cd6-b6e4c52d2574 1175-5326 230100 5DC6D761-D857-49B8-A88C-29DEC44E30F7 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. 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. 34a, detail of tarsal claw. 35, posterior margin of terga IV. 36, gill IV. 37, paraproct. 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 ).