Camelobaetidius leentvaari Demoulin, 1966

Boldrini, R., Salles, F. F. & Pes, A. M. O., 2012, Review of the genus Camelobaetidius Demoulin (Ephemeroptera: Baetidae) with reduced terminal filament, Journal of Natural History 46 (33 - 34), pp. 2033-2073 : 2057-2061

Camelobaetidius leentvaari Demoulin, 1966

( Figures 5D ; 7C; 13; 14)

Demoulin 1966: 9; Traver and Edmunds 1968: 674; McCafferty and Waltz 1990: 783; Lugo-Ortiz and McCafferty 1995: 178; Dominique et al. 2001: 40; Dominique et al. 2002: 18; Thomas et al. 2003: 124; Salles, Andrade and Da-Silva 2005: 52; Salles, Serrão and Pereira 2005: 70; Salles and Serrão 2005: 276; Domínguez et al. 2006: 131; Boldrini and Salles 2009: 6; Boldrini et al. 2010: 65; Nieto 2010: 12; Nieto et al. 2011: 4.

Diagnosis

Camelobaetidius leentvaari differs from the other described species of the genus with the terminal filament reduced based on the following combination of characteristics for nymphs: (1) segment II of labial palp with distomedial projection strongly produced ( Figure 13E ); (2) forefemur with prominent protuberance on inner margin ( Figure 14A ); (3) foretibia with indentation at apex; (4) small thoracic gill present at the base of forecoxa; (5) prosternum with a single, medial protuberance (as in Figure 10A ); (6) tarsal claws with 17–23 denticles; (7) paraprocts with 5–17 small marginal spines ( Figure 14D ).

Redescription

Nymph. Length of body: 7.4 mm; antennae: broken; cerci: 7.3 mm; terminal filament: 0.4 mm; tibia I: 1.8 mm; tibia II and III: 1.2 mm.

Head. Light brown. Antenna with scape and pedicel subcylindrical. Lateral branch of epicranial suture sinuous. Labrum ( Figure 13A ). Rectangular, broader than long; dorsal surface flat. Length about 0.4 × maximum width; distal margin with shallow medial emargination with asymmetrical margins; lateral margin with long, fine, simple setae; anterolateral margin with long, fine, pectinate setae; medially with short, robust, pectinate setae. Dorsally with many short, fine, simple setae scattered over basal area; dorsolateral arc of setae with a row of 17 long, fine and apically pointed setae. Ventrally with short, spine-like setae on anterolateral margin. Left mandible ( Figure 13B ). Inner and outer incisors fused, respectively with 4 + 3 denticles; prostheca robust, apically denticulate; margin between prostheca and mola straight, with a row of spine-like setae; subtriangular process narrow; tuft of setae at apex of mola absent; basal half with short, fine, simple setae scattered over dorsal area. Right mandible ( Figure 13C ). Inner and outer incisors fused, respectively with 4 + 3 denticles; prostheca robust, apically denticulate, shorter than left prostheca; margin between prostheca and mola straight, with a row of spine-like setae; tuft of spine-like setae at base of mola present; tuft of setae at apex of mola present; basal half with short, fine, simple setae scattered over dorsal area. Maxilla ( Figure 13D ). Crown of galea-lacinia with inner dorsal row of setae with three pectinate denti-setae. Medial protuberance of galea with 1 + 3 long, fine, simple setae. Maxillary palp subequal in length of galea-lacinia. Palp segment II subequal in length of segment I; maxillary palp with fine, simple setae scattered over surface. Labium ( Figure 13E ). Glossa narrow and subequal in length to paraglossa; inner margin with 10 spine-like setae increasing in length distally; apex with three long, spine-like setae; outer margin with two long, spine-like setae; ventral surface with four short, fine, simple setae on anteromedian area; dorsal surface bare. Paraglossa 1.2 × length of glossa, sub-rectangular, curved inward; apex with two rows of long, fine, pectinate setae; ventral surface with one fine, simple seta near base; dorsal surface with two robust, simple setae near apex. Labial palp with segment I 0.9 × length of segments II and III combined; segment I scattered with micropores, inner and outer margins with short, simple setae; segment II with distomedial protuberance strongly produced, with long, simple setae; dorsally with a row of five fine, spine-like setae; segment III rounded, length 0.5 × width, scattered with simple setae, and fine, simple, spine-like setae.

Thorax ( Figure 5D ). Light brown. Hind wing pad present. Small thoracic gill present at the base of forecoxa. Prosternum with a single, medial protuberance (as in Figure 10A ). Foreleg ( Figure 14A ) light brown. Tibia I 1.0 × length of femur I; tarsi I 0.5 × length of femur I. Forefemur with prominent protuberance on inner margin; length about 2.3 × maximum width; dorsally with row of c.60 long, spine-like setae; length of setae 0.1 × maximum width of femur; ventrally with many short, spine-like setae scattered over surface; anterior and posterior surface with many short, spine-like setae on inner margin. Tibia. Dorsally with scattered short, fine, simple setae; ventrally with many short, spine-like setae; anterior surface with long, fine, simple setae; posterior surface with many short, spine-like setae near inner margin; tibiopatellar suture more than half length of tibia, located at apex of tibia; foretibia with indentation at apex. Tarsus. Dorsally with short, fine, simple setae; ventrally with nine spine-like setae increasing in length toward apex. Tarsal claws with 17–23 denticles. Mid and hind femora without prominent protuberance on inner margin, and mid and hind tibia without indentation at apex. Tibia II and III 1.0 × length of femur II and III, respectively; tarsi II and III 0.3 × length of femur II and III, respectively.

Abdomen ( Figure 5D ). Light brown. Terga IV creased ( Figure 14B ); posterior margin with truncate spines bearing acute spines. Gills IV ( Figure 14C ) light brown; margins with narrow, spine-like setae intercalating short, fine, simple setae; trachea unpigmented, with two main trunks. Gills oval. Gill I 1.8 × length of segment II; gill IV 1.8 × length of segment V; gill VII 1.5 × length of segment VIII. Paraproct ( Figure 14D ) with 17 marginal spines on inner margin; surface shagreened with short, fine, simple setae. Terminal filament 0.05 × length of cerci. Cerci light brown; outer margin with tufts of long, simple setae.

Comments

This species was described based on nymphs from Surinam ( Demoulin 1966). Later, Salles, Serrão and Pereira (2005) redescribed the species based on type material and additional material from Brazil, state of Amapá, and Nieto et al. (2011) recorded this species from Venezuela. In the description presented by Salles, Serrão and Pereira (2005), they observed five small marginal spines on inner margin of paraproct. After examining a nymph from the same locality, we observed the presence of 17 small spines on inner margin of the paraproct. Therefore, the species has a variation of 5–17 spines on paraproct. The hypopharynx was lost in the process of mounting the slide, but is well illustrated (fig. 2 from Salles, Serrão and Pereira (2005). Camelobaetidius leentvaari is possibly closely related to the species in which the forefemur has a prominent protuberance on inner margin: C. francischettii , C. ipaye and C. mantis . It is differentiated from the last two species by the presence of medial protuberance on prosternum, and is differentiated from C. francischettii by the number of denticles on tarsal claw, 34–39 versus 17–23 in C. leentvaari .

Distribution

SURINAM; VENEZUELA. BRAZIL: Amapá.

Material examined

One nymph mounted on slide, BRAZIL, Amapá, Laranjal do Jarí, Cachoeira Santo Antônio , 1 ◦ 06 ′ 54.43 ′′ S, 51 ◦ 59 ′ 11.51 ′′ W, 24 June 2001, Hamada, N. leg ( PPGBT) .

Figures

Figure 5. Camelobaetidius spp., nymphs (d.v.). (A) C. billi; (B) C. francischettii; (C) C. ipaye; (D) C. leentvaari; (E) C. maranhensis; (F) C. rufiventris.

Figure 10. (A) Camelobaetidius francischettii (detail of prosternum, ventro-lateral v.); (B) Camelobaetidius maranhensis (detail of pronotum, dorso-lateral v.).

Figure 13. Camelobaetidius leentvaari, nymph. (A) Labrum (left v.v., right d.v.); (B) left mandible; (C) right mandible; (D) maxilla; (E) labium (left v.v., right d.v.).

Figure 14. Camelobaetidius leentvaari, nymph. (A) Foreleg; (B) posterior margin of terga IV; (C) gill IV; (D) paraproct.