Apobaetis jacobusi, Cruz & Boldrini & Hamada, 2020

Cruz, Paulo Vilela, Boldrini, Rafael & Hamada, Neusa, 2020, Redescription of Apobaetis lakota McCafferty, 2000 (Ephemeroptera: Baetidae) and description of two new species from Brazil, Zootaxa 4885 (2), pp. 249-258: 254-257

publication ID

https://doi.org/10.11646/zootaxa.4885.2.6

publication LSID

lsid:zoobank.org:pub:1867609A-0C7B-4060-B33E-B4594D332B91

DOI

http://doi.org/10.5281/zenodo.4327925

persistent identifier

http://treatment.plazi.org/id/2B0C87B5-FF96-9E6E-0BEE-FCEF9A280580

treatment provided by

Plazi

scientific name

Apobaetis jacobusi
status

sp. nov.

Apobaetis jacobusi   sp. nov.

( Figs 3 View FIGURE 3 A–3J, 4C–4E)

Diagnosis. Larva. 1) labrum rectangular, broader than long, medially with two protuberances ( Fig. 3A View FIGURE 3 ); distal margin, between medial lobe and lateral denticle, with thin setae; 2) maxillary palp long, more than 2.0× the length of galea-lacinia; segment I robust, longer than galea-lacinia ( Fig. 3D View FIGURE 3 ); 3) lingua subquadrate with one small medial lobe ( Fig. 3E View FIGURE 3 ); 4) glossa distally pointed ( Fig. 3F View FIGURE 3 ); 5) inner projection of labial palp of segment II rounded, segment III of labial palp triangular ( Fig. 3F View FIGURE 3 ); 6) tarsal claw I with the same length as tarsus, without row of denticles ( Fig. 3G View FIGURE 3 ); 7) posterior margin of tergum IV with triangular spines (longer than wide) ( Fig. 3H View FIGURE 3 ).

Description. Larva. Head: Antenna with minute spines and thin, simple setae on apex of each segment. Frons with two small parallel keels, slightly concave (almost flat) between keels. Labrum ( Fig. 3A View FIGURE 3 ): rectangular, broader than long; distal margin without shallow medial emargination; medially with two protuberances, area between them with thin setae; medial area of distal margin with one row of long thin setae on dorsal surface; ventral surface with one row of robust setae at distal margin. Left mandible ( Fig. 3B View FIGURE 3 ): outer and inner sets of incisors with 4 and 3 denticles, respectively; prostheca robust, inner margin frayed at distal half; margin between prostheca and mola concave, with frayed lobe close to subtriangular process; tuft of robust setae at base of mola present; subtriangular process wide; denticles of mola not constricted; lateral margin convex. Right mandible ( Fig. 3C View FIGURE 3 ): outer and inner sets of incisors with 3 and 2 denticles, respectively; prostheca slender; margin between prostheca and mola concave; tuft of robust setae at base of mola present; denticles of mola not constricted; lateral margin convex. Maxilla ( Fig. 3D View FIGURE 3 ): maxillary palp long, more than 2.0× the length of galea-lacinia; segment I robust, longer than galea-lacinia; segment II robust, without distal constriction; maxillary palp with thin, simple setae scattered over the surface. Hypopharynx ( Fig. 3E View FIGURE 3 ): lingua subquadrate and longer than superlingua, with one small medial lobe and without distal tuft of setae; superlingua not expanded, with short, thin, simple setae scattered over distal margin. Labium ( Fig. 3F View FIGURE 3 ): glossa narrowing slightly distally on inner margin and with apex pointed, longer than paraglossa; dorsal surface with one arc of robust setae on distal third, from inner to outer margin; ventral surface with distal row of robust setae, covered with thin setae. Paraglossa curved inward; dorsal surface with one longitudinal row of four robust setae near inner margin; apex with one robust seta; outer margin with one row of eight robust setae; ventral surface with one longitudinal row of four robust setae in the middle. Labial palp with segment I 0.8× the length of segments II and III combined; inner projection of labial palp of segment II rounded, outer margin and projection covered with thin, long, simple setae; segment III triangular, covered with thin, long, simple setae on outer margin, dorsal surface with one row of six robust setae, outer margin almost straight. Thorax. Foreleg ( Fig. 3G View FIGURE 3 ). Femur: with one row of eight short blunt setae on dorsal margin; apex with two short blunt setae; ventral margin with one row of six short robust setae. Tibia: ventrally with one row of 12 short robust setae. Patella-tibial suture from dorsal to ventral margin. Tarsus: ventrally with one row of 12 short robust setae. Tarsal claws the same length as tarsus, row of denticles absent. Claws II and III slightly longer than tarsus. Abdomen. Tergum II darker, tergum V with one dark mark, terga V–IX with one reddish mark on distolateral margin ( Figs 4 View FIGURE 4 C–4E). Tergal surface creased, with micropores (not illustrated); posterior margin with triangular spines (longer than wide) ( Fig. 3H View FIGURE 3 ). Gill VI, rounded ( Fig. 3I View FIGURE 3 ), outer margin slightly expanded (all other gills broken and lost). Paraproct ( Fig. 3J View FIGURE 3 ) with four marginal spines, posterolateral extension with few spines. Cerci and paracercus with lateral spines on all segments.

Comments. The new species was found in the riverbed (sand bottom), one meter deep in the dry season. The river, in the sector where the new species was collected, has approximately five meters width; it is surrounded by pasture, almost without riparian vegetation.

Etymology. We dedicate this species to Luke M. Jacobus for his contribution to the knowledge of mayflies and who gave great support to the first author (P.V.C.) at the Purdue Entomological Research Collection, U.S.A.

Material examined. Holotype, one larva on slide, Brazil, Rondônia, Nova Londrina district, Ji-Paraná, Rio Urupá , Balneário no Nelim , access to the farm by secondary road (” linha ” in Portuguese) No. 6, S11°02’11.4” W062°08’41.5”, 25.viii.2016, Cruz P. V. & Hamada N. cols., INPA GoogleMaps   . Paratype, one larva in 80% ethanol, same data as holotype, INPA GoogleMaps   .

V

Royal British Columbia Museum - Herbarium

INPA

Instituto Nacional de Pesquisas da Amazonia