Baetodes pseudospinae 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 : 66-68

Baetodes pseudospinae Salinas , sp. nov

( Figs 22–31 )

Nymph. Length of body: 4.0 mm; cerci: 4.2 mm; terminal filament: 0.30 mm; antennae 1.0 mm.

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

Mouthparts. Labrum. Semicircular, not expanded laterally ( Fig. 23 ), length about 0,66–0.69× maximum width; distal margin with slight medial emargination; lateral margin with row of long, fine and simple setae; medial setae short; dorsally with a subapical row of 2+4 long setae of subequal length. Left mandible ( Fig. 24 ): outer margin almost straight; incisors fused, inner and outer set of incisors with seven denticles; prostheca robust; margin between prostheca and mola straight, without tuft of setae; tuft of spine-like setae at apex and base of mola absent; denticles of mola slightly separated; basal half with short, fine, simple setae scattered over dorsal surface. Right mandible ( Fig. 25 ): 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 present, reduced to one small seta; basal half with short, fine, simple setae scattered over dorsal surface. Maxilla ( Fig. 26 ): crown of galea-lacinia with four denticles; inner-dorsal row of setae on inner margin of maxilla with two pectinate dentisetae; medial protuberance of galea-lacinia with 1+4 spine-like setae; palp subequal in length to galea-lacinia, segment II subequal in length to segment I. Hypopharynx ( Fig. 27 ): lingua with distal margin rounded and subequal in length to superlingua; spine-like setae present in lingua; superlingua not expanded; short, fine, simple setae scattered over distal margin of lingua and superlingua. Labium ( Fig. 31 ): g lossa narrow and subequal to paraglossa, inner margin with spine-like setae, apex with long spine-like seta and one pectinate seta, outer margin bare, ventral surface bare; paraglossa subrectangular, apex curved, truncated, with three rows of pectinate setae, and ventrally bare; palp: segment I subequal in length to 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 conical, length 1.5× width, covered with spine-like and fine, simple setae.

Thorax. Colour brown. Mesonotum with a horizontal dark band in posterior margin. Pronotum with two tubercles. Mesonotum with two tubercles. Metanotum with one tubercle longer than first abdominal tubercle.

Legs ( Fig. 29 ) colour light brown; with one white band on the anterior region of femur. Forefemur: length about 3.2× maximum width; dorsally with one row of short, fine and simple setae alternating with 9–10 clavate long setae ( Fig. 30 ); ventrally with micropores, fine simple setae and one row of spine-like setae Tibia: dorsally with a row short, fine, simple setae, ventrally with one row short spine-like setae; posterior surface with one row of long, simple and fine setae. Tarsus dorsally with short, fine, simple setae; ventrally with one row of long and robust spine-like setae; tarsal claw ( Fig. 28 ) with one row of 6–7 denticles increasing in size distally. Coxal gills: two on each coxa.

Abdomen ( Fig 22 ). Terga surface bare, segments I–VIII dark brown, segments IX–X with light yellow. Tubercles presents in the segments I–XI, rounded and prominent; segments I–III with erect tubercles, segments IV–IX with tubercles directed posteriorly. Sterna , segments I–VII light brown, segments VIII–X light yellow. Caudal filaments light brown.

Adults: unknown.

Diagnosis. Baetodes pseudospinae 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 a subapical row of 2+4 long setae of subequal length ( Fig. 24 ); 2) apex of glossa with one pectinate seta ( Fig. 31 ); 3) pronotum and mesonotum with two tubercles; 4) tubercle simple and prominent in the metanotum ( Fig. 22 ); 5) two gills on each coxa; 6) dorsal edge of femora with one row short, fine and simple setae alternating with 9–10 clavate long setae as in Fig. 30 ; 7) tarsal claws ( Fig. 28 ) with one row of 6–7 denticles.

Etymology. The species is named pseudo (Greek, to mock) and spinae , an allusion to B. spinae , a very similar species.

Material examined. Holotype. Colombia: Nariño: Ricaurte, Chorrera del amor in 5.XI. 2007. Dias, L.G; Bacca,T; Angulo, D; Estacio, J. Cols. Paratype. 6 nymphs collected same data and locality as holotype. Holotype deposited in CEBUC, 1 nymphal paratype in CEUNES, 1 nymphal paratype and remaining material in PSO.

Discussion. B. pseudospinae sp. n. shows some affinities with B. spinae Mayo. These species possesses two tubercles in pronotum and the mesonotum, besides two gills on each coxa and prominent tubercles in the abdomen. However this new species can be distinguished from B. spinae by the presence of one prominent tubercle in metanotum and one pectinate setae in the apex of glossa ( B. spinae possess a reduced tubercle in the metanotum and two pectinate setae in the apex of glossa).

First key to the nymphs of Colombian species of Baetodes (adapted from Domínguez et al. 2006).

1. Coxal gills present..................................................................................... 2

- Coxal gills absent................................................................................ B. solus

2 (1). One finger–like gill on each coxa, gill with basal projection ( Figure. 17 ); dorsal edge of femora with small clavate setae (Fig- ure 20)................................................................................. B. diasae sp.nov

- Two finger–like gills on each coxa, gills without basal projection; dorsal edge of femora with long clavate setae (longer than half length of fine setae)................................................................................ 3

3 (2). Pronotum and mesonotum with 2 tubercles................................................................. 4

- Pronotum and mesonotum without tubercles................................................................ 5

4 (3). Metanotum with tubercle longest than first abdominal tubercle, some abdominal tubercles directed posteriorly, others erected ( Figure 22 ); apex of glossa with one pectinate setae ( Figure 31 )............................... B. pseudospinae sp.nov

- Metanotum with tubercle smaller than first abdominal tubercle, abdominal tubercles erected ( Figure 22 ); apex of glossa with two pectinate setae............................................................................. B. spinae

5 (3). Abdominal terga with very small tubercles ( Figure 1 ); dorsal edge of femora with 4–6 clavate setae ( Figure 9 ); tarsal claws with 1 row of 6–8 denticles ( Figure 7 ).......................................................... B. awa sp.nov

- Abdominal terga with prominent tubercles; dorsal edge of femora with 6–7clavate setae; tarsal claws with 1 row of 5–6 denti- cles............................................................................................ B. levis

Figures

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

FIGURE 22. Baetodes pseudospinae sp. nov. Lateral view of abdomen.

FIGURES 23 – 31. Baetodes pseudospinae sp. nov. (23) labrum; (24) left mandible; (25) right mandible; (26) maxilla; (27) hypopharynx; (28) tarsal claw; (29) foreleg; (30) forefemora, detail of dorsal margin; (31) labium.

FIGURES 12 – 21. Baetodes diasae sp. nov. (12) labrum; (13) left mandible; (14) right mandible; (15) maxilla; (16) hypopharynx; (17) coxal gill; (18) tarsal claw; (19) foreleg; (20) forefemora, detail of dorsal margin; (21) labium.

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.