Apobaetis pucupi, Cruz, Paulo Vilela & De-Souza, Marcia Regina, 2014

Cruz, Paulo Vilela & De-Souza, Marcia Regina, 2014, Two new species of Apobaetis Day, 1955 (Ephemeroptera: Baetidae) from Brazil, Zootaxa 3866 (4), pp. 591-599 : 595-597

Apobaetis pucupi sp. nov.

( Figures 2 , 15–26 )

Diagnosis. Mature nymph. 1) distal margin of labrum medially with spatulate setae; 2) maxillary palp 1.50× length of galea-lacinia ( Fig. 19 ); 3) segment II of maxillary palp with an apical constriction ( Fig. 19 ); 4) apical margin of lingua with three lobules ( Fig. 20 ); 5) segment II of labial palp with pointed and apically directed distomedial projection ( Fig. 21 ); 6) segment III rectangular, length 0.40× width ( Fig. 21 ); 7) tarsal claw 1.54× length of tarsus ( Fig. 21 ); 8) posterior margin of abdominal terga with pointed spines ( Fig. 22 ); 9) paraproct with one marginal spines, posterolateral extension without spines ( Fig. 24 ).

Description. Mature female nymph. Length of body: 3.00 mm; cerci, terminal filament and antenna broken. Body coloration ( Fig. 2 ). Head. Colorations: light yellow. Antenna light yellow. Turbinate portion of compound eyes light yellow. Thorax. Light yellow. Foreleg. Femur, tibia and tarsus light yellow. Femur with one light brown mark at middle on anterior surface and one light brown mark on apex dorsal margin. Tibia with one light brown mark on base ventral margin. Abdomen. Terga light yellow, segments II, III and VI brown medially, segment V brown near lateral margin, all terga with four spots on anteromedial margin and one mark laterally ( Fig. 2 ).

Body morphology. Head. Antenna with minute spines and fine, simple setae on apex of each segment ( Fig. 15 ). Frons with two keels. Labrum ( Fig. 16 ). Rectangular, broader than long; length about 0.69× maximum width; distal margin with shallow medial emargination; ventral surface with robust spine-like setae on anterolateral and distal margin; dorsal surface with three to four short and spatulate setae medially near distal margin; dorsal surface near distal margin covered by long and thin setae. Right mandible ( Fig. 17 ). Incisors deeply cleft in two sets; outer and inner set of incisors respectively with 3 and 2 denticles; prostheca slender, bifurcated at middle; margin between prostheca and mola concave; tuft of spine-like setae at base of mola present; denticles of mola not constricted; apex of mola with two simple setae; lateral margin convex. Left mandible ( Fig. 18 ). Incisors deeply cleft in two sets; outer and inner set of incisors respectively with 5 and 3 denticles; prostheca robust, bifid at middle, inner lobe slender, outer lobe robust; margin between prostheca and mola concave; tuft of spine-like setae at base of mola absent; subtriangular process wide; denticles of mola not constricted; lateral margin convex. Hypopharynx ( Fig. 20 ). Lingua subquadrangular with three lobules, without apical tuft of setae and slightly longer than superlingua; superlingua not expanded; short, fine, simple setae scattered over distal margin of lingua and superlingua. Maxilla ( Fig. 19 ). Maxillary palp long, 1.50× length of galea-lacinia; segment II 1.40× length of segment I, apex with constriction; maxillary palp with fine and simple setae scattered over surface. Labium ( Fig. 21 ). Glossa basally broad, narrowing apically and longer than paraglossa; inner margin bare; apex with three short spine-like setae; outer margin with eight spine-like setae; ventral surface covered with thin and long setae. Paraglossa curved inward; apex bare; outer margin with one row of eight robust spine-like setae; dorsal surface with one longitudinal row of seven robust spine-like setae near inner margin; ventral surface with one longitudinal row of seven robust spine-like setae at middle. Labial palp with segment I 0.87× length of segments II and III combined; segment I covered with micropores; segment II with pointed and apically directed distomedial projection, outer margin and distomedial projection covered with fine, long and simple setae; inner margin bare; segment III rectangular, length 0.40× width, covered with fine, long and simple setae on outer margin, ventral surface with four robust spine-like setae near outer margin, distal margin with one row of ten robust spine-like setae. Thorax. Foreleg ( Fig. 22 ). Ratio 1.8:1:1.1:1.3. Forefemur. Length about 4.90× maximum width; dorsally with row of 12 short concave and apically straight setae; apex with two concave and apically rounded setae (similar to Fig. 11 a, but with apex rounded instead); ventrally with row of elongated spine-like setae. Tibia. Dorsally bare; ventrally with one row of nine short spine-like setae. Tibio-patelar suture present. Tarsus. Dorsally bare; ventrally with one row of ten short spine-like setae. Tarsal claws 1.54× longer than tarsus, row of denticles absent. Abdomen. Terga surface covered by scale-like triangular spines, micropores and short, fine and simple setae; posterior margin with regular spines ( Fig. 23 ). Sterna white. Gills lost. Paraproct with one marginal spine, posterolateral extension without spines ( Fig. 23 ). Cerci with small lateral spines on all segments ( Fig. 25 ), terminal filament without spines ( Fig. 26 ).

Etymology. The specific name is derived from the Tupi-Guarani roots Pucu —long and Pi —claw. Tupiguarani is a language spoken by an indigenous tribe that inhabits the Brazilian litoral.

Material examined. Holotype: nymph on slide, BRAZIL, state of Minas Gerais, Lima Duarte, road to Ibitipoca after bridge, 26.x.2011, S21º 47’55.0’’ / W043º49’27.7’’, Cruz P.V. and De-Souza M.R. (colls.).

Figures

FIGURES 1 – 2. Dorsal habitus of nymphs. (1) Apobaetis kethepiali sp. nov.; (2) Apobaetis pucupi sp. nov.

FIGURES 15 – 21. Apobaetis pucupi sp. nov. (15) antennae; (16) labrum (left d. v., right v. v.); (17) right mandible; (18) left mandible; (19) maxillae; (20) hypopharynx (left d. v., right v. v.); (21) labium (palp were separated to facilitate visualization of structures).

FIGURES 22 – 26. Apobaetis pucupi sp. nov. (22) foreleg; (23) posterior margin of abdominal terga IV; (24) paraproct; (25) detail of cerci; (26) detail of terminal filament.

FIGURES 10 – 14. Apobaetis kethepiali sp. nov. (10 a) foreleg; (10 b) detail of dorsal margin setae of forefemur; (11) posterior margin of abdominal terga IV; (12) paraproct; (13) detail of cerci; (14) detail of terminal filament.