Camelobaetidius yacutinga Nieto, 2003

Boldrini, R., Jacobus, Luke M., Salles, F. F. & Pes, A. M. O., 2013, The adults of Camelobaetidius janae Dominique & Thomas, 2001 and C. yacutinga Nieto, 2003, with a new synonym for C. leentvaari Demoulin, 1966 (Ephemeroptera: Baetidae), Zootaxa 3702 (2), pp. 150-158 : 153-155

Camelobaetidius yacutinga Nieto, 2003

( Figs. 7–13 )

Camelobaetidius yacutinga Nieto 2003: 247 ; Domínguez et al., 2006: 139.

Diagnoses. Male: 1) anteronotal protuberance pointed ( Fig. 7 ); 2) abdominal terga segments II–VI with reddish brown band along midline, posterior margin of segments I–VII reddish brown ( Figs. 7, 8 ); 3) posterior margin of subgenital plate straight ( Fig. 12 ); 4) forceps segment I without distomedial projection ( Fig. 12 ); 5) forceps segment I 0.3×length of segment II ( Fig. 12 ); 6) forceps segment III elongate 3.0× as long as wide ( Fig. 12 ). Female: (1) anteronotal protuberance pointed; 2) abdominal terga segments II–VI with reddish brown band along midline, posterior margin of segments I–VII reddish brown ( Fig. 13 ).

Description. Male imago. Antennae: 0.6–0.8 mm; body: 4.7–5.3 mm; cerci broken; forewing: 4.4–4.9 mm; hind wing: 0.8–1.0 mm; tibia I: 1.5–1.7 mm; tibia II: 0.8–1.0 mm; tibia III: 0.7–0.8 mm (n=4).

Head ( Figs. 7, 8 ) yellowish brown; compound eyes greyish; turbinate eye with dorsal portion greyish, apical margin of turbinate eye black, basal half of stalk yellowish (turbinate eye yellowish green in vivo). Antenna light brown.

Thorax ( Figs. 7, 8 ) with yellowish brown Pro- and mesonotum; lateral margin of pronotum reddish; metanotum brown. Medioparapsidal suture reddish; posterior scutal protuberance brown. Prosternum light brown, mesosternum brown, metasternum dark brown. Anteronotal protuberance pointed. Metascutellar protuberance reddish, posteriorly rounded. Legs whitish. Coxa I, II and III with a reddish mark. Femur II and III with a subapical reddish mark. Tarsal segments I and II of the middle and hind legs with one large apical spine ( Fig. 11 ). Leg I: tibia 1.7× length of femur; tarsus 1.2× length of femur. Leg II tibia 1.3× length of femur; tarsus 0.3× length of femur. Leg III tibia 1.2× length of femur; tarsus 0.3× length of femur.

Forewing hyaline ( Fig. 9 ); veins light brown; stigmatic area with eight cross veins not touching subcostal vein. Marginal intercalary veins paired, except between veins CuA and Cup; length of forewing about 2.6× width. Hind wing ( Figs. 10 a, 10b) hyaline with two complete longitudinal veins; costal process rounded apically, located on basal third.

Abdomen ( Figs. 7, 8 ) with yellowish brown terga, segments II–VI with reddish brown band along midline, posterior margin of segments I–VII reddish brown, lateral margin of segments II–VI reddish brown. Sterna white, washed with light brown. Genitalia ( Fig. 12 ) with segments of forceps white, washed with light brown. Forceps segment I without distomedial projection; 0.3× length of segment II; distance between internal margins of forceps 0.4× distance between lateral margins of forceps. Forceps segment II narrow submedially. Forceps segment III elongate, 3.0× as long as wide; 0.2× length of segment II. Posterior margin of subgenital plate straight.

Female imago. Similar to male. Antennae: 0.8 mm; body: 4.7–5.5 mm; cerci: broken; forewing: 4.8–5.3 mm; hind wing: 0.7–1.0 mm; tibia I: 0.9–1.0 mm; tibia II: 0.9–1.0 mm; tibia III: 0.7–0.8 mm (n=3).

Head ( Fig. 13 ) yellowish brown. Antennae yellowish brown.

Thorax ( Fig. 13 ) with nota yellowish brown; anterior margin and lateral margin of pronotum reddish. Medioparapsidal suture reddish. Prosternum whitish. Tarsi segments I and II of the legs with an apical spine (shorter than the male) (as in Fig. 11 ). Femur I, II and III with a subapical reddish mark. Legs. Yellowish brown. Leg I: tibia 1.3× length of femur; tarsus 0.5× length of femur. Leg II tibia 1.2× length of femur; tarsus 0.3× length of femur. Leg III tibia 1.3× length of femur; tarsus 0.5× length of femur.

Forewing hyaline; veins light brown; stigmatic area with nine cross veins, four not touching subcostal vein. Marginal intercalary veins paired, except between veins ICuA1 and ICuA2; length of forewing about 2.5× width. Hind wing hyaline with two complete longitudinal veins; costal process rounded apically, located on basal third.

Abdomen ( Fig. 13 ) with posterior margins of segments I–IX reddish brown. Sterna whitish.

Distribution. Argentina (Nieto, 2003). New Record: Brazil: Rio Grande do Sul.

Comments. In the key proposed for the South American species of Camelobaetidius (Dominguez et al., 2006) , C. yacutinga would key as C. anubis (Traver & Edmunds, 1968) . However, adults of both species can be distinguished by abdominal color pattern ( C. yacutinga has a reddish band along the midline of segments II–VI, while in C. anubis the medial reddish brown marks are restricted to segments II and VI) and by the spination of the tarsi ( C. yacutinga has large apical spines on segments I and II of the mid and hind legs, while C. anubis , has only a short apical spine on segment II).

Material examined. Four male and three female adults (reared), Brazil, Rio Grande do Sul, Tenente Portela, Lajeado Leão river, 27°21'03.6" S / 53°35'52.3" W, 28.ix.2011, Boldrini, R., Cruz, P.V. leg. (three male and two female in CNZC and one male and one female in INPA).

Figures

FIGURES 7 – 13. Adults of Camelobaetidius yacutinga. 7 – 12, male imago; 13, female imago. 7, body (lateral view). 8, body (dorsal view). 9, forewing. 10 a, hind wing. 10 b, hind wing (enlarged). 11, detail of middle tarsi. 12, genitalia. 13, body (dorsal view). Abbreviations: I, II, III: forceps segments I, II, III, respectively.