Baetodes liviae Polegatto & Salles

Salles, Frederico Falcão & Polegatto, Cleber Macedo, 2008, Two new species of Baetodes Needham & Murphy (Ephemeroptera: Baetidae) from Brazil, Zootaxa 1851, pp. 43-50 : 47-49

Baetodes liviae Polegatto & Salles , n. sp.

( Figs. 14 – 25 )

Nymph. Body length: 4.2mm; cerci: 5.0mm; terminal filament: 0.5mm. General coloration brownish.

Head. Coloration brownish, with anterior gray areas and dark brown spots on midline and posterior area of head capsule. Compound eyes black; turbinate portion dark brown. Antennae whitish. Labrum ( Fig. 15 ) not expanded laterally, dorsal surface of each side of midline with a row of six setae; four setae near midline, alternating one long, one short, and two long setae near lateral margin, and also a group of ca. nine short, fine, setae posteriorlly. Hypopharynx as in Figure 16 , apex of lingua broadly pointed. Mandibles as in Figs. 17 – 18 , with a ventral group of fine, long, simple setae near anterior margin; right prostheca covered with minute setae. Maxillae ( Fig. 19 ) with three setae medially. Labium ( Fig. 20 ). Glossa little shorter than paraglossa, apex with one pectinate blade-like seta and four fine, stout, simple setae; paraglossa without nonpectinate blade-like, but with one robust, pectinate seta.

Thorax. Coloration brownish, with dark brown marks as in Fig. 14 ; pleura whitish with hard parts gray, sterna white. Pronotum with posterior margin slightly elevated (similar to Fig. 13 ). Metanotum with tubercle. Legs ( Fig. 14 , 21 ) coloration dark brown with light brown areas on femur and tarsus, dorsal edge of femora with 6 to 8 clavate setae, eventually 13, nearly the length of long fine setae ( Figs. 21 – 22 ). Tarsal claws ( Fig. 23 ), with one large subapical denticle, and about 7 basal small denticles. One gill on each coxae ( Fig. 21 ).

Abdomen. Coloration light brown; anterior and posterior margin of terga with brownish to dark brownish marks as in Fig. 14 ; sterna whitish-brown. Segments 1 – 9 with median blunt, small, dorsal tubercle, and fine long setae; posterior ¼ of terga covered with minute spines ( Fig. 24 ). Gills oblong, whitish translucent, main trachea weakly pigmented ( Fig. 25 ). Caudal filaments light brown.

Adults: unknown

Etymology: the name of this new species is in honor of Lívia Pinheiro, who collected the specimens and for her friendship and help.

Material examined: Holotype. Mature nymph. Brazil, Paraná State, Morretes, Nhundiaquara Stream, near Porto de Cima, 8km from city, 10.II.2005, Lívia Pinheiro. Paratypes. 12 nymphs, same data as holotype, but collected in VIII.2005.

Diagnosis: Baetodes liviae , n. sp., can be distinguished from the other known species of the genus by the following combination of characters: 1) large body size; 2) glossae with one pectinate bladelike setae, paraglossa without nonpectinate blade-like ( Fig. 20 ); 3) third segment of labial palp nearly half the length of the second segment ( Fig. 20 a); 4) dorsal edge of femora often with 6 to 8 clavate setae, nearly the length of long fine setae ( Figs. 21 – 22 ); 5) one gill on each coxa ( Fig. 21 ); 6) metanotum and abdominal segments 1 – 9 with dorsal small tubercles; and 7) body color pattern ( Fig. 14 ).

Biology: The stream where this species was collected has a width near 10m, shallow water, with large and medium stones. There is a large area with well preserved forest, but some parts are disturbed by human activity, mainly because of tourism points and farms.

Figures

FIGURE 14. Baetodes liviae, n. sp., General habitus of nymph.

FIGURES 15 – 25. Baetodes liviae, n. sp., nymph; 15, labrum. 16, hypopharynx. 17, left mandible. 18, right mandible. 19, maxilla. 20, labium (a, left, dorsal view, right, ventral view; b, detail of segment 3 of palp). 21, foreleg. 22, detail of dorsal edge of femora. 23, tarsal claw. 24, tergum 4. 25, gill.

FIGURES 2 – 13. Baetodes santatereza, n. sp., nymph; 2, labrum. 3, hypopharynx. 4, left mandible. 5, right mandible. 6, maxilla. 7, labium (a, left, dorsal view, right, ventral view; b, detail of glossa; c, detail of segment 3 of palp). 8, foreleg. 9, detail of dorsal edge of femora. 10, tarsal claw. 11, tergum 4. 12, gill. 13, lateral view of nymph.