Apobaetis luanae, De Lima & Cruz & Hamada, 2023

De Lima, Cláudia R. T., Cruz, Paulo Vilela & Hamada, Neusa, 2023, Additions and corrections to taxonomy of Apobaetis fiuzai Salles & Lugo-Ortiz, 2002 and Apobaetis kallawaya Nieto, 2006 (Ephemeroptera, Baetidae), European Journal of Taxonomy 879 (1), pp. 136-161 : 153-155

Apobaetis luanae sp. nov.

urn:lsid:zoobank.org:act:4DAD1B52-E7CD-42A1-81D5-488EF898A98D

Figs 1 , 9–11

Apobaetis kallawaya – Boldrini & Cruz 2014: 4.

Diagnosis

NYMPH. Characterized by a combination of the following characters: 1) labrum rectangular with rounded distolateral margins, distal medial margin with three protuberances; dorsal surface with 4 short and simple medial spine-like setae near distal margin; ventral surface with short medial spine-like setae near distal margin ( Fig. 10A, C ); 2) hypopharynx with lingua subquadrangular, elongated, with apical tuft of setae, subequal in length to superlingua ( Fig. 10G ); 3) maxillary palp long 2.0 × length of galea-lacinia; segment II without apical constriction ( Fig. 10H ); 4) labial palp with segment II with robust triangular distomedial projection, apically rounded, laterally directed; segment III triangular ( Fig. 10I ); 5) foreleg with anterior surface of femur with one row of 4 to 5 minute blunt setae, on basal half, near dorsal margin; claw I 0.6× length of tarsus I, with two row of denticles on basal third; 6) posterior margin of tergum IV with triangular spines, wider than long ( Fig. 11D ); 7) paraproct with several marginal spines, posterolateral extension with minute spines ( Fig. 11F ).

Etymology

The species name is a tribute to Dr Luana Araújo. She spoke out vehemently against the ineffective drugs used to treat COVID- 19 in the testimony to the CPI organized by the Brazilian Federal Senate in 2021.

Material examined

Holotype BRAZIL • nymph on slide; Roraima, Amajari, Rio Ereu ; 04º02′02.9″ N, 61º23′09.5″ W; 26 Mar. 2012; N. Hamada, P. V. Cruz, G. Dantas and R. Boldrini leg.; INPA.

Paratypes BRAZIL – Roraima • 2 nymphs on slide; same collection data as for holotype; INPA • 1 nymph in alcohol 80%; same collection data as for holotype; INPA .

Additional material

BRAZIL – Rondônia • 1 nymph on slide; Teixeirópolis , Vale das Cachoeiras; 10º55′20.4″ S, 62º22′34.7″ W; 3 Sep. 2012; R. Boldrini, A.S. Fernandes and N. Hamada leg.; INPA • 1 nymph on slide; same collection data as for preceding, except date 10 Jul. 2018; INPA .

Description

Nymph

LENGTH. Body: 3.0– 3.3 mm.

HEAD. Antenna: flagellum with minute spines on apex of each flagellomere. Labrum ( Fig. 10A–C ): length 0.6× maximum width; rounded distolateral margins; distal medial margin with three protuberances; dorsal surface with 4 short and simple medial spine-like setae near distal margin, with one row of long, thin and simple setae near distal margin; dorsal surface covered with long, thin and simple setae; ventral surface with one row of robust spine-like setae near distolateral and distal margins; short medial spine-like setae near distal margin. Left mandible ( Fig. 10D–E ): incisors not fused; outer and inner set of incisors with 4 and 3 denticles, respectively; prostheca slender, bifurcated at apical middle; margin between prostheca and mola concave; subtriangular process wide with small protuberance on distal margin and 3 short spine-like setae at base; tuft of setae at base of subtriangular process; denticles of mola not constricted, with 4 prominent denticles in irregular sizes; lateral margin convex. Right mandible ( Fig. 10F ): incisors not fused; outer and inner set of incisors with 3 and 2 denticles, respectively; prostheca slender, bifurcated at apex; margin between prostheca and mola concave; tuft of setae at base of mola absent; denticles of mola not constricted; lateral margin convex. Hypopharynx ( Fig. 10G ): lingua subquadrangular, longitudinally elongated, apex covered with short setae, subequal to superlingua; superlingua oval, longitudinally elongated, with thin setae of different sizes on distolateral and distal margins. Maxilla ( Fig. 10H ): maxillary palp long 2.0 × length of galea-lacinia; segment I subequal to galea-lacinia; segment II with narrow base and apex, with thin and simple setae scattered on surface, without apical constriction; medial margin of galea-lacinia with 2 spine-like setae. Labium ( Fig. 10I ): glossa subtriangular, longer than paraglossa; dorsal surface with one longitudinal row of 8 short spine-like setae on apical ⅔ near inner margin; 1 robust spine-like seta on apex; longitudinal row of 5 robust spine-like setae on apical middle near outer margin; ventral surface covered with long, thin and simple setae. Paraglossa curved inward; dorsal surface with 1 long and robust spine-like seta on apex; longitudinal row of 9 long spine-like setae on apical ⅔ near outer margin and longitudinal row of 3 long and robust spine-like setae on apical middle near inner margin. Labial palp with segment I 0.6× length of segments II and III combined, covered with micropores (not illustrated); segment II with outer margin covered by thin, long and simple setae, inner margin bare; segment II with robust triangular distomedial projection, apically rounded, laterally directed; ventral surface of distomedial projection with tuft thin, long and simple setae; segment III triangular, length subequal to width, covered by thin, long and simple setae on outer margin, dorsally with one row of 8 robust spine-like setae near inner margin, ventrally with one row of 5 robust spine-like setae in near distal margin.

THORAX. Holotype pigment ( Fig. 9A–B ): light yellow; femur without mark. Legs ( Fig. 10A–C ). Femur: anterior surface with one row of 4 to 5 minute blunt setae, on basal half, near dorsal margin; ventral margin with one row of 3 to 4 elongated spine-like setae on basal third. Tibia: dorsal margin bare; ventral margin with one row of 6 to 7 spine-like setae. Patella-tibial suture present, from dorsal margin to ventral margin. Tarsus: dorsal margin bare; ventral margin with one row of 10 to 11 spine-like setae; tarsus I 1.2× length of tibia I; tarsi II and III length subequal to tibiae II and III. Claws: two rows of denticles on basal third; claw I 0.6× length of tarsus I; claws II and III 0.7× length of tarsi II and III.

ABDOMEN. Holotype pigment ( Fig. 9A–B ): terga II–X covered by light brown marks; cerci and paracercus with medial brown mark. Tergum IV ( Fig. 11D ): surface covered by triangular scale-like projections and micropores; posterior margin with triangular spines, wider than long. Gills ( Fig. 11E ): rounded apex, simple trachea without branches; long length, extending to half third subsequent tergum. Paraproct ( Fig. 11F ) with several marginal spines; posterolateral extension with minute spines. Cerci ( Fig. 11G ) with short spines on all segments; medial brown mark. Paracercus ( Fig. 11H ) without spines; medial brown mark.

Figures

Fig. 1. Map with distribution of Apobaetis fiuzai Salles & Lugo-Ortiz, 2002 (including putative records) (black circles), Apobaetis pasternakae sp. nov. (yellow stars), Apobaetis kallawaya Nieto, 2006 (green square), Apobaetis jaquelinae sp. nov. (red triangles), and Apobaetis luanae sp. nov. (blue triangles).

Fig. 9. Apobaetis luanae sp. nov., holotype (INPA), habitus of nymph. A. Nymph male (d.v.). B. Nymph male (v.v.). Abbreviations: d.v. = dorsal view; v.v. = ventral view. Not to scale.

Fig. 10. Apobaetis luanae sp. nov., holotype (INPA), mouthparts of nymph. A. Labrum (left d.v., right v.v). B. Detail of simple medial spine-like setae on dorsal surface of labrum. C. Detail of short medial spine-like setae on ventral surface of labrum. D. Left mandible. E. Detail of setae on process subtriangular base of left mandible. F. Right mandible. G. Hypopharynx. H. Maxilla. I. Labium (left d.v., right v.v.). Abbreviations: d.v. = dorsal view; v.v. = ventral view. Not to scale.

Fig. 11. Apobaetis luanae sp. nov., holotype (INPA), thorax and abdomen of nymph. A. Foreleg (femur on anterior surface). B. Detail of setae on anterior surface of forefemur. C. Claw. D. Posterior margin of tergum IV. E. Gill. F. Paraproct. G. Cercus. H. Paracercus. Not to scale.