Baetodes awa Salinas

Salinas, Luis G., Dias, Lucimar G., Salles, Frederico F. & Bacca, Tito, 2011, Three new species of Baetodes Needham & Murphy (Ephemeroptera: Baetidae) from Colombia, Zootaxa 3110, pp. 61-68 : 62-63

Baetodes awa Salinas , sp. nov

( Figs. 1 10 )

Nymph. Length of body: 3.3 mm; cerci: 3.5 mm; terminal filament: 0.30 mm; antennae 1.00 mm.

Head. Colour yellowish; area between lateral ocelli and compound eyes brownish. Antennae light brown.

Mouthparts. Labrum. Semicircular, expanded laterally ( Fig. 2 ), length about 0.45× maximum width; distal margin with slight medial emargination; lateral margin with row of long, fine and simple setae; medial setae short; dorsally with one subapical row of six long setae of subequal length. Left mandible ( Fig. 3 ): outer margin relatively straight; incisors fused, inner and outer set of incisors with six denticles; prostheca robust; margin between prostheca and mola straight, without tuft of setae; denticles of mola slightly separated; basal half with short, fine, simple seta scattered over dorsal surface. Right mandible ( Fig. 4 ): outer margin almost straight; incisors strongly fused; inner and outer set of incisors with seven denticles; prostheca reduced to one spine-like seta; margin between prostheca and mola convex; denticles of mola fused; tuft of setae at apex of mola, reduced to one small seta; basal half with short, fine, simple seta scattered over dorsal surface. Maxilla ( Fig. 5 ): crown of galea-lacinia with four denticles; dorsal row of setae on inner margin of maxilla with two non pectinate dentisetae; medial protuberance of galea-lacinia with three spine-like setae; palp long, 1.5× longer than galea-lacinia, segment II 1.4× length of segment I. Hypopharynx ( Fig. 6 ): lingua with distal margin pointed and subequal in length to superlingua; spine like setae absent in lingua; superlingua not expanded; short, fine, simple setae scattered over distal margin of lingua and superlingua. Labium ( Fig. 10 ): g lossa narrow and subequal to paraglossa, inner margin with spine-like setae, apex with long spine-like and two pectinate setae of different lenght, outer margin bare, ventral surface bare; paraglossa subrectangular, apex curved, truncated, with three rows of setae, the first nonpectinate, the others apically pectinate and ventrally bare; palpi: segment I 1.7× length of segments II and III combined, segment I bare and with micropores, segment II without distomedial protuberance, inner and outer margin bare or with few simple setae, segment III rounded, length 3× width, covered with spine-like and fine, simple setae.

Thorax. Colour dark brown. Pronotum with white band in lateral margin. Mesonotum brownish. Pleura and sternum reddish. Pronotum without elevation. Mesonotum without tubercle. Metanotum with one very small tubercle.

Legs ( Figs. 8–9 ) colour dark brown; with white marks on apex and base of femur. Forefemur: length about 3× maximum width; dorsally with a row of long, fine and simple setae alternating with 4–6 clavate setae, longer than half length of fine setae ( Fig. 9 ); ventrally with micropores, fine simple setae and one row of spine-like setae. Tibia: dorsally with one row short, fine, simple setae, ventrally with one row of long, fine, simple spine-like setae. Tarsus dorsally with short, fine, simple setae; ventrally with one row of short spine-like setae; tarsal claw ( Fig. 7 ) with one row of 6–8 denticles increasing in size distally. Coxal gills: two on each coxa.

Abdomen. Colour dark brown. Abdominal tubercles: Very small tubercles on segments III–IX ( Fig. 1 ). Terga surface with fine setae, segment X with one white horizontal band Sterna colour light brown, sometimes reddish. Caudal filaments light yellow.

Adults: unknown.

Diagnosis. Baetodes awa sp. nov. can be distinguished from the other known species of the genus by the following combination of characteristics: 1) dorsal surface of labrum with one subapical row of six long setae of subequal length ( Fig. 2 ); 2) apex of glossa with long spine-like and two pectinate setae of different length ( Fig. 10 ); 3) two gills on each coxa; 4) dorsal edge of femora with one row long, fine and simple setae alternating with 4–6 clavate setae longer than half length of fine setae ( Fig. 9 ); 5) tarsal claws ( Fig. 7 ) with one row of 6–8 denticles increasing in size distally; 6) very small abdominal tubercles on segment III–IX.

Etymology. Awa , an arbitrary combination of letters, is a allusion to the indigenous culture that inhabits the area where this species was collected.

Material examined. Holotype. Colombia: Nariño: Ricaurte, Chorrera del amor, in 5.XI. 2007, Dias, L.G; Bacca,T; Angulo, D; Estacio, J. cols Paratype. 25 nymphs collected, same data and locality as holotype. Holotype and 2 nymphal paratypes deposited in CEBUC, 2 nymphal paratypes in MEUV, 2 nymphal paratypes in CEUNES, 2 nymphal paratypes and remaining material in PSO.

Discussion. B. yuracare Nieto , also possesses small abdominal tubercles and two coxal gills as well as B. awa sp. nov. However, this new species can be distinguished from B. yuracare by the number of setae in the dorsal part of the labrum (five in B. yuracare and six in B. awa ), the shape of the apex of lingua (rounded in B. yuracare and pointed in B. awa ), the number and the length of the clavate setae in the dorsal edge of femora (6–7 short clavate setae in B. yuracare and 4–6 long clavate in B. awa ), and the number of denticles in the tarsal claws (5–6 in B. yuracare and 6–8 in B. awa ).

Figures

FIGURE 1. Baetodes awa sp. nov. Lateral view of abdomen.

FIGURES 2 – 10. Baetodes awa sp. nov. (2) labrum; (3) left mandible; (4) right mandible; (5) maxilla; (6) hypopharynx; (7) tarsal claw; (8) foreleg; (9) forefemora, detail of dorsal margin; (10) labium.