Camelobaetidius tepequensis, 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 : 560-563

Camelobaetidius tepequensis sp. nov. Boldrini

( Figs. 6 ; 48–57)

Diagnose. Nymphs: 1) Labrum subrectangular ( Fig. 48 ); 2) segment II of labial palp with distomedial projection robust and rounded ( Fig. 53 ); 3) thoracic gill absent at the base of coxae; 4) ventral surface of femur with many short, blunt setae ( Fig. 54 ); 5) foretibia rotated at apex ( Fig. 54 ); 6) tarsal claws with 9–11denticles ( Fig. 54 a); 7) abdomen elongate ( Fig. 6 ); 8) posterior margin of terga with rounded spines ( Fig. 55 ).

Description. Nymph. Length of body: 8.6–8.9 mm; length of antennae: 0.7–1.0 mm; length of cerci: 2.4–3.9 mm; length of terminal filament: 2.1–3.4 mm; tibia I: 0.4 mm; tibia II: 0.5 mm; tibia III: 0.5 mm.

Head ( Fig. 6 ). Brown. Antennae short, light brown, scape and pedicel subcilindrical. Lateral branch of epicranial suture straight.

Labrum ( Fig. 48 ). Subrectangular, broader than long. Length about 0.5× maximum width; lateral margin with long, fine, simple setae; anterolateral and anterior margin with long, fine, bifid and pectinate setae. Dorsally with six short, fine, simple setae scattered over basal area; dorsolateral arc of setae with a row of nine long, fine, apically pointed setae. Ventrally with three short, spine-like setae anterolateral margin.

Left mandible ( Fig. 49 ). Incisors with seven denticles. Prostheca robust, apically denticulate. Margin between prostheca and mola with a row of five spine-like setae; subtriangular process short. Basal half with ten short, fine, simple setae.

Right mandible ( Fig. 50 ). Incisors with seven denticles. Prostheca slender, apically denticulate; margin between prostheca and mola with a row of three short, spine-like setae; setae at apex of mola present. Basal half with 14 short, fine, simple setae.

Hypopharynx ( Fig. 51 ). Lingua subequal in length to superlingua; apex with anteromedial lobe rounded, with short, fine, simple setae. Superlingua not expanded, with fine, simple setae scattered over lateral and distal margin, apex truncated obliquely, external margin cleft subapically.

Maxilla ( Fig. 52 ). Inner dorsal row of setae with two pectinate denti-setae, apical denti-seta opposed to canines. Medial protuberance of galea with 1 + 3 long, fine and simple setae. Maxillary palp subequal in length to galea-lacinia, with fine and simple setae scattered over maxillary palp.

Labium ( Fig. 53 ). Glossa longer than paraglossa; inner margin with ten spine-like setae increasing in length distally, last three pectinate ( Fig. 53 a); apex with one short, robust spine-like setae; outer margin with four long, spine-like setae. Paraglossa sub-rectangular, curved inward; apex with three rows of long, fine, pectinate setae; dorsal surface with one short, fine, spine-like and four long, fine, pectinate setae near to apex. Labial palp segment II with distomedial projection robust and rounded; dorsally with a row of seven fine, spine-like setae; segment III rounded, length 0.6× width, scattered with simple setae, and spine-like setae.

Thorax ( Fig. 6 ). Light brown; metanotum brown. Hind wing pad present. Thoracic gill absent at the base of coxae. Femur, tibia and tarsi light brown; apex of femur brown. Tibia I 0.8× length of femur I; tibia II and III 0.9× length of respective femur; tarsi I, II and III about 0.5× length of the respective femur.

Forefemur ( Fig. 54 ). Length about 2.1× maximum width; dorsally with row of c.a. 60 long, spine-like setae; ventrally with many short, blunt setae; anterior surface with many, short, blunt setae scattered over surface. Foretibia. Dorsally with fine, simple setae; ventrally with short, spine-like setae; anterior surface with short, blunt setae; apex with eleven short, spine-like setae; patella-tibial suture present, 0.7× in length of tibia; rotated at apex. Foretarsi. Ventrally with six short, spine-like setae and one long, fine, simple setae near apex. Tarsal claws with 9–11 denticles ( Fig. 54 a). Mid femur. Length about 2.5× maximum width; dorsally with a row of c.a. 65 long, spine-like setae. Hind femur. Length about 2.7× maximum width; dorsally with row of 55 long, spine-like setae.

Abdomen ( Fig. 6 ). Light brown, segments I, IV and VII lighter. Terga with creased surface, posterior margin of tergum IV with rounded spines ( Fig. 55 ). Gills oval. Gills IV ( Fig. 56 ) light brown; margins with narrow spine intercalating short, fine, simple setae; tracheae pigmented. Gill I 0.7× length of segment II; gill IV 1.3× length of segment V; gill VII 0.8× length of segment VIII. Paraproct ( Fig. 57 ). With two spines near inner margin; surface with fine, simple setae, without shagreened area; postero-lateral extension with marginal spines. Cerci brown, basal 1/3 light brown; outer and inner margin of terminal filament and inner margin of the cerci with tufts of long, simple setae; outer margin of the cerci with spines at apex on each segment, basal 1/4 with short spines.

Etymology: The epithet specific of the new species is an allusion to the locality where the material was collected, Serra do Tepequém.

Distribution. BRAZIL: Roraima.

Comments. Camelobaetidius tepequensis sp. nov. differs from others species of the genus by the presence of many, short, blunt setae on anterior surface of femur ( Fig. 54 ), tibia rotated at apex ( Fig. 54 ), and elongate abdomen ( Fig. 6 ). These characters, until now, are not found in any other species of Camelobaetidius .

Material examined. Holotype: Nymph, BRAZIL, Roraima, Amajarí, Serra do Tepequém, Cachoeira da Barata, 03°47'07.7"N / 61°45'02.6"W, 29.iii.2012, Boldrini, R. and Cruz, P.V. leg ( INPA). Paratypes: Three nymphs same data as holotype (two in CZNC and one in FAMU); Two nymphs (mounted in slides, medium Euparal), same data as holotype ( UFRR); Three nymphs same data as holotype, except for 16.iii.2014, Boldrini, R. and Salles, F. leg. ( CZNC).

Figures

FIGURES 5 – 8. 5, C. sallesi sp. nov. 6, C. tepequensis sp. nov. 7, C. mexicanus.

FIGURES 48 – 53. Camelobaetidius tepequensis sp. nov., nymph. 48, labrum (left v. v., right d. v.). 49, left mandible. 50, right mandible. 51, hypopharynx. 52, maxilla. 53, Labium (left v. v., right d. v.). 53 a, detail of apex of glossa.

FIGURES 54 – 57. Camelobaetidius tepequensis sp. nov., nymph. 54, foreleg. 54 a, detail of tarsal claw. 55, posterior margin of terga IV. 56, gill IV. 57, paraproct.