Tricorythodes biluhue, Emmerich & Molineri, 2020

Emmerich, Daniel & Molineri, Carlos, 2020, A new species of Tricorythodes Ulmer (Ephemeroptera: Leptohyphidae) from Uruguay, Zootaxa 4885 (1), pp. 125-132: 126-132

publication ID

https://doi.org/10.11646/zootaxa.4885.1.8

publication LSID

lsid:zoobank.org:pub:D38D0A4F-70DA-4FEC-9AB4-0DAA66B329B7

DOI

http://doi.org/10.5281/zenodo.4324027

persistent identifier

http://treatment.plazi.org/id/C36B4A13-FFCF-1955-E8A5-5E9DFBFA359C

treatment provided by

Plazi

scientific name

Tricorythodes biluhue
status

sp. nov.

Tricorythodes biluhue   sp. nov.

( Figures 1–28 View FIGURES 1–2 View FIGURES 3–14 View FIGURES 15–24 View FIGURES 25–28 )

Type material. Holotype ( MUR) female mature nymph from Uruguay, Tacuarembó, A° Tranqueras , S 31° 47’ 29” – W 55° 58’ 51”, 22/II/2008, Emmerich & Molineri cols GoogleMaps   . Paratypes ( IBN): 10 nymphs, same data as holotype. GoogleMaps   One nymph, Uruguay, Salto, Arroyo (abbreviation = A°) Itapebí , finca Iribarne , S 31º 22’ 3.4” – W 57º 32’ 24.5”, 102 m, 17/II/2008, Emmerich & Molineri cols. GoogleMaps   16 nymphs, Uruguay, Artigas, Aº de los Chanchos , S 30º 34’ 48.3” – W 56º 37’ 10.8”, 130 m, 18/II/2008, Emmerich & Molineri cols. GoogleMaps   Three nymphs, Uruguay, Artigas, Finca Mataojo Grande , Aº Mataojo Grande , 274 m, S 31º 17’ 29.7” – W 56º 13’ 10”, 18/II/2008, Emmerich & Molineri cols. GoogleMaps   Two nymphs, Uruguay, Rivera, Tranqueras , río Tacuarembó , 147 m, S 31º 10’ 40” – W 55º 45’ 44”, 19/II/2008, Emmerich & Molineri cols. GoogleMaps   Two nymphs, Uruguay, Rivera, Santa Ernestina , A° sin nombre , 146 m, S 31º 32’ 23.8” – W 55º 33’ 42”, 19/II/2008, Emmerich & Molineri cols. GoogleMaps   Two nymphs, Uruguay, Rivera, Mina de Corrales   , Aº Corrales , 140 m, S 31º 34’ 34” – W 55º 27’ 58”, 19/II/2008, Emmerich & Molineri cols. GoogleMaps   Three nymphs, Uruguay, Rivera, Aº Zapucay , 140 m, S 31º 47’ 01” – W 55º 20’ 02”, 19/II/2008, Emmerich & Molineri cols. GoogleMaps   Two nymphs, Uruguay, Tacuarembó, A° Carpintería , 121 m, S 31º 48’ 28” – W 55º 13’ 09”, 20/II/2008, Emmerich & Molineri cols. GoogleMaps   Six nymphs, Uruguay, Cerro Largo, Aº Tacuarí , 92 m, S 32º 31’ 51” – W 54º 07’ 48”, 20/II/2008, Emmerich & Molineri cols. GoogleMaps   One nymph, Uruguay, Durazno, Sarandí del Yí , río Yí , 132 m, S 33° 20’ 41” – W 55° 37’ 07”, 22/II/2008, Emmerich & Molineri cols. GoogleMaps   Two nymphs, Uruguay, Tacuarembó, Valle Edén , A° Tambores , S 31° 48’ 48” – W 56° 10’ 24”, 160 m, 23/ II/2008, Emmerich & Molineri cols. GoogleMaps   Six nymphs, Uruguay, Paysandú, A° Soto , 43m, S 32° 03’ 10” – W57° 40’ 23”, 23/II/2008, Emmerich & Molineri cols. GoogleMaps   One nymph, Uruguay, Paysandú, A° Guayabos Grande , 83 m, S 32° 22’ 45” – W 57° 20’ 11”, 1/III/08, Emmerich & Pérez, cols. GoogleMaps   15 nymphs, Uruguay, Río Negro , A° Don Esteban , 34 m, S 32° 50’ 07” – W 57° 30’ 59”, 2/III/2008, Emmerich & Pérez cols. GoogleMaps   Seven nymphs, Uruguay, Flores, Camino vecinal , A° sin nombre , 115 m, S 33° 42’ 52” – W 56° 39’ 40”, 2/III/2008, Emmerich & Pérez cols. GoogleMaps   Three nymphs, Uruguay, Lavalleja, Minas, Cañada Solís , 123 m, S 34° 24’ 08” – W 55° 21’ 11”, 3/III/2008, Emmerich & Pérez cols. GoogleMaps   Six male imagoes, one female imago, Uruguay, Maldonado, A° El Rodeo , 75 m, S 34° 40’ 20” – W 55° 14’ 15”, 7–8/XI/2008, Emmerich col. GoogleMaps   Two nymphs, Uruguay, Paysandú, A° Sacra , 10 m, S 32° 21’ 02” – W 58° 03’ 04”, 7/III/2008, Emmerich & Pérez cols. GoogleMaps   Two nymphs, Uruguay, San José, Aº Pavón , 86 m, S 34° 18’ 53.2” – W 56º 52’ 24.7”, 6/XI/2008, Emmerich col. GoogleMaps   Two nymphs , Uruguay, Rivera, Cañada sin nombre , 289 m, S 31º 05’ 36.7” – W 55º 57’ 57.9”, 11/ XI/2008, Emmerich col. GoogleMaps   Three nymphs, Uruguay, Tacuarembó, A° Potrero , 157 m, S 31º 54’ 13.9” – W 56º 46’ 34.9”, 26/III/2010, Emmerich & Molineri cols. GoogleMaps   One nymph. Uruguay, Río Negro , ”El Chicharrón” , A° Grande , S 32º 31’ 45” – W 57º 08’ 11.9”, 9/8/07. E. Morelli & A. Verdi cols GoogleMaps   .

Diagnosis. The nymphs of Tricorythodes biluhue   sp. nov. can be distinguished from all other species of the genus by the following combination of characters: 1) maxillary palp 2 to 3–segmented ( Figs. 6–7 View FIGURES 3–14 ); 2) hypopharynx with spine on inner margin of superlinguae ( Fig. 9 View FIGURES 3–14 ); 3) pronotum with pointed anterolateral projection and small blunt tubercle medially; 4) legs relatively long and slender, covered with long setae ( Figs. 11, 13 and 14 View FIGURES 3–14 ); 5) fore tarsal claws with 10–13 marginal denticles and with 0–1 + 1 submarginal denticles ( Fig. 12 View FIGURES 3–14 ); 6) abdominal segments with lateral flanges on III–VI and small posterolateral spines on VI–IX ( Fig. 17 View FIGURES 15–24 ); 7) operculate gills subtriangular, shaded widely except on paler area close to insertion ( Fig. 18 View FIGURES 15–24 ); 8) gills III–V with relatively wide ventralmost lamellae. The adults are characterized by: 1) vein CuP present and complete; 2) the ratio length of forceps segment I/forceps segment II 0.8; 3) penes subpyramidal, with a small apical furrow and with sclerotized yellowish lateral margins ( Fig. 24 View FIGURES 15–24 ). The eggs are characterized by: 1) pear–shaped with one polar cap present ( Fig. 28 View FIGURES 25–28 ).

Descriptions.

Mature nymph ( Figs. 1–23 View FIGURES 1–2 View FIGURES 3–14 View FIGURES 15–24 ).

Length (mm): body, 4.2–4.8, caudal filament, 3.0–3.7, cerci, 2.2–2.6.

General coloration yellowish gray with black markings ( Fig. 2 View FIGURES 1–2 ). Head shaded with gray mainly on occiput. Mouthparts: labrum with relatively shallow anteromedian emargination ( Fig. 3 View FIGURES 3–14 ) with marginal row of stout bifid setae ventrally, and with pectinate setae dorsally as in figures 4 and 5; mandibles with setae on outer margin; hypopharynx with medially concave lingua, superlingua with a spine on inner margin at proximal third ( Fig. 9 View FIGURES 3–14 ); maxillary palp small but elongated, 2 or 3 segmented with apical seta ( Figs. 6–8 View FIGURES 3–14 ), distal brush of maxilla with 25–35 long and curved setae, with stipes 1.0 the length of galea–lacinia, inner proximal margin of the galea–lacinia (opposite to palpus) with row of 3–4 simple setae and one large pectinate seta ( Figs. 6 and 7 View FIGURES 3–14 ); labium with paraglossae and glossae with the same length, lateral margin of prementum with 19–32 long and thin setae ( Fig. 10 View FIGURES 3–14 ). Thorax. Pronotum yellowish shaded with gray, with small blunt tubercle medially ( Fig. 15 View FIGURES 15–24 ) and pointed anterolateral projection ( Fig. 16 View FIGURES 15–24 ). Mesonotum yellowish shaded extensively with gray, darker on anterolateral corners; wingbuds yellowish with black veins; small anteromedian blunt tubercle. Metanotum and thoracic sterna paler, not shaded. Legs yellowish, shaded gray on femora and with a proximal and a distal macula on tibiae. Foreleg: transverse row of long setae ( Fig. 11 View FIGURES 3–14 ) located at 0.4–0.5 of total femoral length from base; total length (tl, same figure) / maximum width (mw) of femur = 2.4–3.1; fore tarsal claw with 10–13 marginal denticles and with 0–1 + 1 submarginal denticles ( Fig. 12 View FIGURES 3–14 ). Middle and hind legs ( Figs. 13 and 14 View FIGURES 3–14 ): femur covered with many long weak setae, some forming a proximal transversal row, other scattered over surface and margins; total length / maximum width of hind femur = 2.8–3.6; tarsal claw with 11–13 marginal denticles and 0–1 + 1 subapical sumarginal denticles. Abdomen. Yellowish shaded with gray widely,except on intersegmental membranes, darker on medial longitudinal line; small posterolateral spines present on segments VI–IX (smaller on IX), lateral flanges present on segments III–VI ( Fig. 17 View FIGURES 15–24 ). Gill formula 3/3/3/3/2. Operculate gills subtriangular, shaded widely with irregular gray markings except on a paler area near insertion ( Fig. 18 View FIGURES 15–24 ); gills III–VI with a pair of basal black marks, gills III–V with relatively wide ventral most lamellae ( Figs. 20–23 View FIGURES 15–24 ). Caudal filaments yellowish white shaded with gray on basal segments.

Variations. The coloration is variable; some nymphs are pale with few dark markings, others are blackish or reddish ( Figs. 1 and 2 View FIGURES 1–2 ). Operculate gills also vary in coloration: some nymphs present a basal black band and the rest homogeneously shaded with gray, others nymphs show blackish operculum.

Male imago ( Figs. 24–27 View FIGURES 15–24 View FIGURES 25–28 )

Length (mm): Body, 4.8–5.0, Fore wing, 5.0–5.5, Caudal filaments, 13.0, Terminal filament, 14.0–18.5.

General coloration gray brown. Head. Yellowish with gray shading on occiput. Pronotum. Medially whitish with longitudinal black stripe, meso– and metanotum brownish, mesopleura and meso- and metasternum brownish with lighter membranes ( Figs. 25 and 26 View FIGURES 25–28 ). Legs. Whitish, coxae, trochanters and femora yellowish brown; tibiae and tarsi much paler; blackish shading medially and subapically on femora; tibiae with a basal and distal black macula; inner face of tibiae II and III with a medial black stripe along patellotibial suture ( Fig. 27 View FIGURES 25–28 ). Fore wing. Translucent, veins shaded with gray, vein CuP complete. Abdomen. Brownish yellow with whitish intersegmental membranes black maculae present medially and also irregular gray shading on all terga. Sterna similar to terga with a medial black macula on each intersegmental membrane ( Figs 25 and 26 View FIGURES 25–28 ). Genitalia. Styliger plate whitish with brownish hind margin. Forceps translucent. Penes subpyramidal, whitish yellow shaded with brown as in figure 24. Caudal filaments whitish translucent shaded slightly with gray.

Female imago. Length (mm): Body, 5.5, Forewing, 6.8. Coloration as in male except abdomen plenty of orangish eggs.

Eggs. Pear–shaped with disc-like polar cap on thinner pole ( Fig. 28 View FIGURES 25–28 ).

Distribution. T. biluhue   sp. nov. has a wide distribution in Uruguay as shown in figure 29.

Etymology. The epithet biluhue   comes from the charrua language ”bilú hue” and means ”beautiful water”. We want to dedicate this species to the Uruguayan people and the Franciscan Family of this country who are demanding the repeal of the recently irrigation law that violates the human and biotic right to water.

IBN

IBN

MUR

Murray State University