Camelobaetidius guaycara Sibaja-Araya & Esquivel, 2018

Sibaja-Araya, Fabián & Esquivel, Carlos, 2018, Camelobaetidius guaycara, a new species of Baetidae (Ephemeroptera) from Costa Rica, Central America, Zootaxa 4434 (1), pp. 89-98 : 90-96

Camelobaetidius guaycara Sibaja-Araya & Esquivel , sp. nov.

FigureS 1 –8.

Diagnosis. Mature nymphs. 1) labrum with anterior margin with about 13 Small, double, frayed Setae; arc of anterodorSal Setae of labrum with 1 + 6 Setae, the two inner oneS frayed; intermediate Setae preSent; Several Small Simple Setae near poSterior margin; ventral Surface with a denSe arc of Short, fine Setae near the anterior margin and with 4 Short Setae near lateral margin; a minute Seta near the anterior margin on both SideS of the cleft ( Fig. 4a ); 2); left mandible with 5 Short inciSorS, tip of the Slender proceSS eXtended at about the Same level aS the inciSorS ( Fig. 4b ); 3) Segment II of labial palp with a Short triangular diStomedial projection ( FigS. 5c, d, e ); 4); one Small thoracic gill at the baSe of foreleg; 5) tarSal clawS with 27–32 denticleS ( Fig. 6b ); 6) poSterior margin of abdominal tergum IV with rounded SpineS of different SizeS ( Fig. 6c ); 7) paraproct with 1–3 SpineS ( Fig. 6e ).

Size: Mature nymphS. Body length: 4.5–5.5 mm, femaleS larger than maleS; antenna: 2.0–3.0 mm; cerci 3.5– 4.0 mm; terminal filament 3.0– 3.5 mm.

Body coloration: head with olive SpotS on fronS; pro and metanotum homogeneouS dark olive; meSonotum with elongate dark olive markS; femora with elongate olive markS on anterior face; abdominal terga coloration SeXually dimorphic, additionally both SeXeS from both SlopeS have diStinct patternS of abdominal coloration ( Fig 2 ), that of maleS being aS followS: a) tergum VIII completely white while other terga have a dark/light olive pattern (14 individualS), b) terga I, II, VIII completely white, other terga with dark/light olive pattern (21 individualS), c) tergum VIII light gray with two Small SpotS and other terga with dark/light olive pattern (21 individualS), and d) all terga with dark/light olive pattern (12 individualS); femaleS preSent two coloration patternS: one Similar to male pattern c) (15 individualS), and the other like male pattern d) (31 individualS); femora with elongate olive markS on anterior face, femur-tibia articulation dark brown; tibiae and tarSi white; cerci dark grey and terminal filament white ( Fig. 3 ).

Body morphology. Head: Antennae Scape and pedicel with minute, Simple Setae on lateral marginS; both dorSal and ventral SurfaceS bare.

Labrum ( Fig. 4a ) broader than long; anterior margin with about 13 double, frayed Setae, arc of anterodorSal Setae with 1 + 6 Setae, Second inner Seta longer than the firSt, both frayed, remainder of Setae Simple, all Setae of arc long, eXtending beyond margin of labrum; intermediate Seta abSent; lateral margin with 4 Simple Setae and 9–11

frayed, anterolateral Setae. Ventral Surface with a denSe arc of Short, fine Setae near anterior margin, 4 Small Setae near the lateral margin and a minute Seta near the anterior margin on both SideS of cleft.

Left mandible ( Fig. 4b ): inciSorS with 6 denticleS Similar in Size; proStheca well developed; no Setae between proStheca and mola; area bearing the Slender proceSS (thumb) raiSed, the tip of the Slender proceSS eXtending to about Same level aS inciSorS; molar region longer than length between proStheca and Slender proceSS; and three Simple Setae on the mandible’S baSal region.

Right mandible ( Fig. 4c ): inciSorS with 6 denticleS Similar in Size; proStheca not well developed; three Small Simple Setae between proStheca and mola; molar region with a well developed diSk-like proceSS (“molar diSk”) (fig. 4d); molar region Shorter than length between proStheca and molar diSk and four Simple Setae on mandible’S baSal region.

HypopharynX ( Fig. 5a ): lingua Shorter than Superlinguae, apically hairy on dorSal and ventral SurfaceS; Superlinguae apically hairy on dorSal and ventral SurfaceS and with Serrate area at the middle of lateral margin.

MaXillae ( Fig. 5b ): robuSt; galea with four apical canineS and two apical rowS of Setae, Some Setae of one of theSe rowS large and thick while otherS are thin, and Setae of other row Shorter and curved; three Setae on SubdiStal internal margin; maXillary palp not SurpaSSing apical canineS, Segment I Short; Segment II thick, bicepS-like; Segment III elongate, longer than Segment II.

Labium ( Fig. 5c ): paragloSSa and gloSSa equal in length, both dorSally and ventrally with numerouS elongate and curved Setae on apeX; palp Segment I thick, aS long aS SegmentS II + III, dorSal Surface with Several microporeS along eXternal margin; Segment II with a Short triangular diStomedial projection, variable aS Shown in Fig. 5d and 5e ; diStomedial projection diStinctly larger on the right palp of Some individualS, dorSal Surface with Several microporeS and a row of 3–4 Simple Setae, 5–8 Simple marginal Setae on ventral Surface; Segment III rounded, broader than longer, with numerouS robuSt SpineS on ventral Surface, dorSal Surface with a row of robuSt Setae on apeX.

Thorax: DorSally with dark olive pattern, pro and metanotum entirely dark olive, meSonotum with elongate dark olive markS; ventrally yellowiSh. Hind wing padS preSent. Small nipple-like thoracic gillS preSent at baSe of forecoXa; femora with elongate olive markS on anterior face, dorSal edge with one row of 40–45 long Spine-like Setae, ventral edge with numerouS microporeS and Several Short Spine-like Setae, anterior face with Several fine and Short Setae, articulation femur-tibia dark brown; tibia light brown, patella-tibial Suture preSent, two rowS of Setae on dorSal edge, one of them with fine long Setae and the other with fine, Short Setae, ventral edge with Several microporeS near articulation with femur-tibia and 5–6 Spine-like Setae along itS margin, anterior face with Several fine and Short Setae; tarSi light brown, Several Short fine Setae on dorSal edge, ventral edge with 6 Setae along margin, 2 of them long and 1 Short on apeX ( Fig. 6a ); clawS with 27–32 denticleS ( Fig. 6b ).

Abdomen: poSterior margin of abdominal terga with rounded SpineS of different SizeS and Simple fine Setae not SurpaSSing length of larger SpineS ( Fig. 6c ); gillS white, oval; reduced on SegmentS I and VII and with no pigmented tracheation; well-developed tracheation on otherS gillS, marginS with fine, Small Setae ( Fig. 6d ); paraproct with 1–3 Sclerotized SpineS, Several microporeS and Simple, fine Setae on dorSal Surface, ( Fig. 6e ); cerci dark gray and terminal filament white, cerci approXimately 12% longer than the central filament ( Fig. 3 ).

Adults. Unknown.

Material examined: Holotype, mature ♀ nymph on 95% alcohol (mouthpartS, legS, gillS, terga and paraproctS in microvial), CoSta Rica, PuntarenaS province, Río Claro de Golfito, Río Claro , 8°41’13.05’’N / 83°02’48.78’’W, 70 meterS above Sea level, IV/15/2017, F. Sibaja-Araya coll., depoSited at the MNCR . Paratypes, two mature nymphS (partS in microvial), Same data aS the holotype, houSed at LEUNA; two mature nymphS (partS in microvial), Same data aS the holotype, houSed at MZUCR; two mature nymphS, Same data aS the holotype, houSed at PERC; eight mature nymphS, CoSta Rica, LimÓn province, Guácimo , Duacarí , Rio Jiménez , 10°18’04.95’’N / 83°37’24.67’’W, 45 meterS above Sea level, VI/15/2017, F. Sibaja-Araya, M. Guevara-Mora, D. Romero-Serrano, reSpectively depoSited at MNCR (two mature nymphS), LEUNA (two mature nymphS), MNRJ (two mature nymphS), and FAMU (two mature nymphS).

Etymology: The name of thiS SpecieS honorS the indigenouS king Guaycara who Several centurieS ago ruled the Boruca people in Southern CoSta Rica where thiS new SpecieS waS firSt collected.

Figures

FIGURE 1. Geographic distribution of Camelobaetidius guaycara sp. nov. in Costa Rica.

FIGURE 2. Variation in body coloration of Camelobaetidius guaycara sp. nov from the Atlantic and Pacific slopes of Costa Rica (males a: Pacific slope, b: Atlantic slope; females c: Pacific slope, d: Atlantic slope).

FIGURE 3. Coloration pattern of cerci and central filament of Camelobaetidius guaycara sp. nov. from the Atlantic and Pacific slopes of Costa Rica.

FIGURE 4. Camelobaetidius guaycara sp. nov., nymph. a) labrum (left d. v., right v. v.), b) left mandible, c) right mandible, d) molar disk of right mandible detail.

FIGURE 5. Camelobaetidius guaycara sp. nov., nymph. a) hypopharynx (left v. v., right d. v.), b) maxilla, c) labium (left v. v., right d. v.), d), e) labial palp II variations.

FIGURE 6. Camelobaetidius guaycara sp. nov., nymph. a) midleg, b) claws, c) posterior margin of terga IV, d) gill, e) paraproct.