Camelobaetidius ipaye Nieto, 2003

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 : 2053-2057

Camelobaetidius ipaye Nieto, 2003

( Figures 5C ; 6C ; 7B; 11; 12)

Nieto 2003: 235; Salles, Andrade and Da-Silva 2005: 52; Salles, Serrão and Pereira 2005: 74; Salles and Serrão 2005: 275; Domínguez et al. 2006: 645; Nieto 2010: 12.

Diagnosis

Camelobaetidius ipaye differs from the other described species of the genus with the terminal filament reduced based on the following combination of characteristics in nymphs: (1) segment II of labial palp with distomedial projection slightly produced (Figure 26); (2) forefemur with prominent protuberance on inner margin ( Figure 12A ); (3) foretibia with indentation at apex; (4) thoracic gill absent at the base of forecoxa; (5) tarsal claws with 30–37 denticles; (6) paraprocts with 10–15 small marginal spines ( Figure 12D ).

Redescription

Nymph. Length of body: 5.2–5.3 mm; antennae: 1.3–1.4 mm; cerci: 3.5–4.1 mm; terminal filament: 0.3–0.4 mm; tibia I: 1.1 mm; tibia II and III: 1.8 mm.

Head ( Figure 6C ). Brown, vertex with irregular light brown marks. Turbinate portion of male compound eyes reddish brown. Antennae with scape and pedicel subcylindrical, with short, fine, simple setae on apex of each segment. Lateral branch of epicranial suture sinuous. Labrum ( Figure 11A ). 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 short, fine, simple setae scattered over basal area; dorsolateral arc of setae with a row of 10–12 long, fine, apically pointed setae. Ventrally with short, spine-like setae on lateral and anterolateral margin. Left mandible ( Figure 11B ). 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 11C ). Inner and outer incisors fused, respectively with 5 + 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 11D ). 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. Maxilla ( Figure 11E ). 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 galealacinia. Palp segment II subequal in length of segment I; maxillary palp with fine, simple setae scattered over surface. Labium ( Figure 11F ). 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 five long, spine-like setae; ventral surface with two 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 and 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 0.6 × width, scattered with simple setae and fine, simple, spine-like setae.

Thorax ( Figure 5C ). Brown. Hind wing pad present. Thoracic gill absent at the base of forecoxa. Foreleg ( Figure 12A ) light brown. Tibia I 1.0 × length of femur I; tarsi I 0.4 × in length of femur I. Forefemur with prominent protuberance on inner margin; length about 2.8 × maximum width; dorsally with row of c.60 long, spine-like setae; length of setae 0.08 × 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, 0.8 × in length of tibia; foretibia with indentation at apex. Tarsus. Dorsally with short, fine, simple setae; ventrally with 12 spine-like setae increasing in length toward apex. Tarsal claws with 30–37 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 × in length of femur II and III, respectively; tarsi II and III 0.3 × in length of femur II and III, respectively.

Abdomen ( Figure 5C ). Dark brown. Segments II, IV and V with median region light brown. Terga IV creased ( Figure 12B ); posterior margin with truncate spines bearing acute spines. Gills IV ( Figure 12C ) light brown with margins brown; margins with narrow, spine-like setae intercalating short, fine, simple setae; trachea unpigmented, with two main trunk. Gills oval. Gill I 1.5 × length of segment II; gill IV 1.8 × length of segment V; gill VII 1.5 × length of segment VIII. Paraproct ( Figure 12D ) with 10–15 marginal spines on inner margin; surface shagreened with short, fine, simple setae; postero-lateral extension with marginal and submarginal truncate spines. Terminal filament 0.07 × length of cerci. Cerci light brown; outer margin with tufts of long, simple setae.

Comments

This species was described based on nymphs from Argentina, Missiones ( Nieto 2003). This is the first record since the description of the species, based on material from the states of Santa Catarina and Paraná. We examined one specimen from the state of Mato Grosso with slight differences on labium and tarsal claws. In this specimen the distomedial projection of labial palp segment II is a little more robust than in the original description of C. ipaye , and the tarsal claws has 41 denticles, instead of 30–37 .

Camelobaetidius ipaye is possibly closely related to the species in which the forefemur has a prominent protuberance on its inner margin: C. francischettii , C. leentvaari and C. mantis . It is differentiated from the first two species by the absence of medial protuberance on prosternum, and from C. mantis by the number of denticles on tarsal claw, 25 versus 30–37 in C. ipaye .

Distribution

ARGENTINA; new records: BRAZIL: Mato Grosso, Paraná, Santa Catarina .

Material examined

Paratype. Two nymphs, one mounted on slide, Argentina, Missiones, Bompland, A Del Tigre , 27 November 1986, Dominguez, E. leg ( PPGBT) . One nymph mounted on slide, BRAZIL, Mato Grosso, Nova Lacerda, Cascata Uirapuru , 14 ◦ 24 ′ S, 59 ◦ 27 ′ W, 23 July 2001, Hamada, N. leg ( PPGBT) . One nymph mounted on slide, BRAZIL, Santa Catarina, Abelardo Luz, Rio Chapecó , Cachoeira Hotel Quedas , 26 ◦ 33 ′ 06.0 ′′ S, 52 ◦ 19 ′ 29.7 ′′ W, 6 September 2009, Pes, A.M.O. leg ( PPGBT) . Two nymphs, same data above, except, ( INPA). One nymph mounted on slide, BRAZIL, Santa Catarina, Seara, Camping Primavera , Rio Irani , 26 ◦ 46 ′ 1.66 ′′ S, 51 ◦ 49 ′ 49.79 ′′ W, 10 March 2009, Salles, F.F. leg ( INPA) . Two nymphs, same data above, except, ( PPGBT). One nymph mounted on slide, BRAZIL, Paraná, Morretes , 25 ◦ 28 ′ S, 48 ◦ 49 ′ W, 22 February 2008, Salles, F.F. leg.

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 6. Camelobaetidius spp., nymphs. (A) C. billi (head, f.v.); (B) C. francischettii (head, f.v.); (C) C. ipaye (head, f.v.); (D) C. maranhensis (head, f.v.); (E) C. rufiventris (head, f.v.); (F) C. billi (v.v); (G) C. billi (detail of thoracic gill).

Figure 11. Camelobaetidius ipaye, nymph. (A) Labrum (left v.v., right d.v.); (B) left mandible; (C) right mandible; (D) hypopharynx; (E) maxilla; (F) labium (left v.v., right d.v.).

Figure 12. Camelobaetidius ipaye, nymph. (A) Foreleg; (B) posterior margin of terga IV; (C) gill IV; (D) paraproct.