Camelobaetidius rufiventris Boldrini and Salles, 2009
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: 2067-2072
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|Camelobaetidius rufiventris Boldrini and Salles, 2009|
Boldrini and Salles 2009: 6; Salles et al. 2010: 302.
Camelobaetidius sp. 1 ; Lima et al. 2010: 729.
Camelobaetidius rufiventris differs from the other described species of the genus with the terminal filament reduced based on the following combination of characteristics of nymphs: (1) segment II of labial palp with distomedial projection slightly produced ( Figure 17F View Figure 17 ); (2) small thoracic gill present at the base of forecoxa; (3) prosternum with a small, single, medial protuberance; (4) tarsal claws with 35–43 denticles; (5) paraprocts with nine marginal spines ( Figure 18D View Figure 18 ).
Nymph. Length of body: 3.2–5.2 mm; antennae: 1.4–1.5 mm; cerci: 4.6–5.4 mm; terminal filament: 0.2–0.5 mm; tibia I: 1.0 mm; tibia II: 1.6 mm; tibia III: 1.4 mm.
Head ( Figure 6E View Figure 6 ). Brown, vertex with irregular light brown marks. Turbinate portion of male compound eyes reddish brown. Antennae with scape and pedicel subcylindrical, with fine, simple setae on apex of each segment. Lateral branch of epicranial suture sinuous. Labrum ( Figure 17A View Figure 17 ). Rectangular, broader than long; dorsal surface flat. Length about 0.5 × maximum width; distal margin with shallow V-shaped medial emargination; lateral margin with long, fine, simple setae; anterolateral margin with long, fine, pectinate setae; medially with short, robust, pectinate setae. Dorsally with few short, fine, simple setae scattered over basal area; dorsolateral arc of setae with a row of 1 + 18 long, fine, apically pointed setae. Ventrally with short, spine-like setae on lateral and anterolateral margin. Left mandible ( Figure 17B View Figure 17 ). Inner and outer incisors fused, respectively with 3 + 2 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 17C View Figure 17 ). Inner and outer incisors fused, respectively with 3 + 2 denticles; prostheca slender, apically denticulate; margin between prostheca and mola almost 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. Hypopharynx ( Figure 17D View Figure 17 ). Lingua subequal in length to superlingua; apex rounded, with tuft of short, fine, simple setae. Superlingua not expanded with fine, simple setae scattered over lateral and distal margin, external margin higher than inner margin. Maxilla ( Figure 17E View Figure 17 ). 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 17F View Figure 17 ). Glossa narrow and subequal in length to paraglossa; inner margin with six spine-like setae increasing in length distally; apex with two long, spine-like setae; outer margin with three long, spine-like setae; ventral surface and 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 two fine, simple setae 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 slightly 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 5F View Figure 5 ). Brown; pronotum and metanotum with light brown marks. Hind wing pad present. Small thoracic gill present at the base of forecoxa. Prosternum with a small, single, medial protuberance. Foreleg ( Figure 18A View Figure 18 ) brown, femur with light brown marks. Tibia I 1.0 × length of femur I; tarsi I 0.5 × length of femur I. Forefemur. Length about 2.7 × maximum width; dorsally with row of c.50 long, spine-like setae; length of setae 0.2 × maximum width of femur; ventrally with short, spine-like setae scattered over surface, anterior surface with short, spine-like setae. Tibia. Dorsally with a row of short, fine, simple setae; ventrally with scattered short, spine-like setae; anterior surface with long, fine, simple setae; posterior surface with short, spine-like setae near inner margin and 19 robust, spine-like setae at apex, increasing in length toward apex; tibiopatellar suture more than half the length of tibia, 0.8 × in length of tibia. Tarsus. Dorsally with short, fine, simple setae; ventrally with 10 spine-like setae, increasing in length toward apex, and one long, fine, simple seta near apex. Tarsal claws with 35–43 denticles. Tibia II 1.0 × length of femur II; tarsi II 0.5 × length of femur II. Tibia III 0.9 × length of femur III; tarsi III 0.5 × length of femur III.
Abdomen ( Figure 5F View Figure 5 ). Dark reddish brown, segment IV with light brown mark, segment V light brown with margins reddish brown. Terga IV with surface creased ( Figure 18B View Figure 18 ); posterior margin with truncate spines. Gill IV [ Figure 18C View Figure 18 (a)] light brown, margins with narrow, spine-like setae intercalating short, fine, simple setae [ Figure 18C View Figure 18 (b)]; tracheae not pigmented. Gills oval. Gill I 1.8 × length of segment II; gill IV 2.0 × length of segment V; gill VII 1.3 × length of segment VIII. Paraproct ( Figure 18D View Figure 18 ) with nine marginal spines on inner margin; surface shagreened with fine, simple setae. Terminal filament 0.07 × length of cerci. Cerci light brown; outer margin with tufts of long, simple setae.
This species was described based on nymphs from Brazil, from the state of Espírito Santo ( Boldrini and Salles 2009). Later, Lima et al. (2010) recorded this species from the state of Bahia, as Camelobaetidius sp. 1 . The nymphs are found often in areas with moderate to strong currents. Camelobaetidius rufiventris is possibly closely related to C. billi and C. maranhensis , because they present the unique combination of characteristics: terminal filament reduced, and the absence of a projection on the inner margin of the forefemora. It is easily differentiated from those two species by the presence of a medial protuberance on prosternum, and the presence of small spines on the inner margin of paraproct. In C. billi and C. maranhensis the medial protuberance on prosternum is absent; and in C. billi the spines on paraproct are rounded or truncated, while in C. maranhensis spines are not present.
BRAZIL: Bahia, Espírito Santo. New records : Minas Gerais, Rio de Janeiro.
Four nymphs, BRAZIL, Bahia, Itacaré, Cachoeira do Tremembé , 14 ◦ 09 ′ 00.6 ′′ S, 39 ◦ 05 ′ 32.8 ′′ W, 31 July 2010, Boldrini, R GoogleMaps . and Hamada, N. leg ( PPGBT). Two nymphs, BRAZIL, Bahia, Camacã, Rio Panelão , 15 ◦ 24 ′ 24.9 ′′ S, 39 ◦ 32 ′ 01.8 ′′ W, 02 August 2010, Boldrini, R GoogleMaps . and Hamada, N. leg ( PPGBT). Five nymphs, BRAZIL, Espírito Santo, Alfredo Chaves, Nova Mantova , Fazenda Nego Boldrini , Córrego Nova Estrela , 20 ◦ 39 ′ 22.6 ′′ S, 40 ◦ 50 ′ 12.9 ′′ W, 20 February 2009, Boldrini, R GoogleMaps . leg ( INPA). Six nymphs, mesmo dado anterior, exceto, ( PPGBT). One nymph mounted on slide, BRAZIL, Espírito Santo, Alfredo Chaves, Nova Mantova , Fazenda Nego Boldrini , Córrego Nova Estrela , 20 ◦ 39 ′ 22.6 ′′ S, 40 ◦ 50 ′ 12.9 ′′ W, 20 November 2008, Boldrini, R GoogleMaps . leg ( INPA). One nymph mounted on slide, BRAZIL, Minas Gerais, Bom Jesus do Galho, 19 ◦ 49 ′ S, 42 ◦ 18 ′ W, 16 May 2005, Francischetti, C. N. leg ( PPGBT). One nymph mounted on slide, BRAZIL, Rio de Janeiro, Nova Friburgo , 22 ◦ 17 ′ S, 42 ◦ 32 ′ W, May 2008, De Souza, M. R GoogleMaps . leg ( PPGBT).
Key to nymphs of the Camelobaetidius with reduced terminal filament
1. Forefemur with prominent protuberance on inner margin ( Figures 9A View Figure 9 ; 12A View Figure 12 ; 14A View Figure 14 )................................................................... 2 Forefemur without prominent protuberance on inner margin ( Figures 2A View Figure 2 ; 16A View Figure 16 ; 18A View Figure 18 ).............................................................. 5
2. Prosternum with a single, medial protuberance ( Figure 10A View Figure 10 ); thoracic gill present at the base of forecoxa ( Figures 6F,G View Figure 6 )............................ 3 Prosternum without protuberance; thoracic gill absent at the base of forecoxa........................................................................ 4
3. Tarsal claws with 17–23 denticles; paraproct with 5–17 small spines on inner margin ( Figure 14D View Figure 14 )............................. C. leentvaari ( Figure 5D View Figure 5 ) Tarsal claws with 34–39 denticles, paraproct with 18–23 small spines on inner margin ( Figure 9D View Figure 9 )...................... C. francischettii ( Figures 5B View Figure 5 ; 6B View Figure 6 )
5. Pronotum with submedial pair of tubercles ( Figure 10B View Figure 10 ).............................................................. C. maranhensis ( Figures 5E View Figure 5 ; 6D View Figure 6 ) Pronotum without tubercles............................................. 6
6. Prosternum with small, single, medial protuberance; paraproct with nine acute spines on inner margin ( Figure 18D View Figure 18 )......... C. rufiventris ( Figures 5F View Figure 5 ; 6E View Figure 6 ) Prosternum without protuberance; paraproct with 9–14 truncated to rounded spines on inner margin ( Figure 2D View Figure 2 ).............. C. billi ( Figures 3 View Figure 3 ; 5A View Figure 5 ; 6A View Figure 6 )
Departamento de Geologia, Universidad de Chile
Instituto Nacional de Pesquisas da Amazonia
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