Nigrobaetis (Takobia) katerynae Martynov
Martynov, Alexander V. & Godunko, Roman J., 2017, Mayflies of the Caucasus Mountains. IV. New species of the genus Nigrobaetis Novikova & Kluge, 1987 (Ephemeroptera, Baetidae) from Georgia, Zootaxa 4231 (1) : -
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|Nigrobaetis (Takobia) katerynae Martynov|
Nigrobaetis (Takobia) katerynae Martynov , sp. nov.
Material. HOLOTYPE: male larva, GEORGIA, Adzharia [Autonomous Republic of Adjara], Kobuleti district , Kintrishi State Nature Reserve , near Khino monastery, stream in forest—right tributary of Cherulisghele River , current velocity—up to 0,4 m /s, depth—up to 0,0 5 m, width of the stream— 0,4–0,7 m, bottom—stones of different size, 41°43'44"N 42°04'46"E, h ~ 985 m a.s.l., 8.06.2013, Martynov A.V. leg.— IN Grg 19 Baekat /1. GoogleMaps
PARATYPES: 3 larvae (one mounted in Canada balsam—slide Ñ 607) same locality as holotype, 8.06.2013, Martynov A.V. leg. GoogleMaps — IN Grg 19 Baekat /2; 1 larva (slide Ñ 581), GEORGIA, Adzharia [ Autonomous Republic of Adjara], Kobuleti district , Kintrishi State Nature Reserve , between Narusala and Sarbiela Mts., limnocrene (areanear 0,5 m 2, depth— 0,1–0,15 m, with flow out stream) and spring (left tributary of Cherulisghele River , current velocity— 0,1–0,5 m /s, width of the spring— 0,2–0,6 m, bottom—stones, send, soil), 41°45'40"N 42°06'29"E, h ~ 2305 m a.s.l., 10.06.2013, Martynov A.V. leg. GoogleMaps — IN Grg 10 Baekat; 1 larva (slide Ñ 582), GEORGIA, Adzharia [ Autonomous Republic of Adjara], Kobuleti district , Kintrishi State Nature Reserve , flank of Narusala Mt. , stream—source of Cherulisghele River , current velocity— 0,1–0,6 m /s, width of the stream— 0,4– 1 m, bottomstones, send, 41°46'21"N 42°05'39"E, h ~ 2160 m a.s.l., 11.06.2013, Martynov A.V. leg.— IN Grg 11 Baekat. GoogleMaps
Etymology. The new species is named in honour of Kateryna Martynova, wife of the first author.
Diagnosis. Gills on tergum I absent. Terga unicolored, light brown—brown, without any pattern. Legs light brown. Large, oval, light spot present in basal part of femora. Right mandible with 8 incisors; prostheca consists of two setae. Left mandible with 7 incisors. Maxillary palp not long. Glossae with group of hair-like setae near apex on dorsal side. Segment II of labial palp with well-marked, small, rounded projection; segment III nearly symmetrical, slightly rounded or elongated. Stout setae along external margin of femora not numerous and arranged in one row. Only a few stout setae situated at apex of external margin of fore and middle femora. Posterior margin of tergum I without triangular spines; terga II–X with triangular spines. Paraproct has a middle-sized prolongation with numerous long pointed spines on its margins and surface. Scales on terga, paraproct plate and legs rounded or oval, not elongated apically. Caudal filaments unicolored, light brown. Paracercus well developed, as long as 3/5 of cerci length.
Description. Larva. Size of ultimate larval instar: body length 4.0– 5.1 mm; cerci length 3.5–3.7 mm, paracercus length 2.0– 2.4 mm.
Coloration. Dorsum of head and thorax uniformly light brown to brown. Only indistinct yellow pattern present on pro- and mesonotum. Terga unicolored, light brown to brown, without any pattern. In some specimens terga XI– X somewhat lighter, almost yellow; other specimens with terga VI–X darker than others. Legs and ventral side of abdomen and thorax lighter than other parts of body ( Figs 1–4 View FIGURES 1 – 4 ).
Head. Colour light brown, lighter near eyes and along epicranial suture. Antennae yellow, slightly shorter than 1/2 of body length. Frontal suture rounded apically, without additional flexures near apex ( Figs 3 View FIGURES 1 – 4 , 5 View FIGURES 5 – 12 ). Scapus and pedicellus covered with solitary scale sockets (sometimes called "scale bases" or "nests of scales"), hair-like setae and chloride cells; chloride cells more numerous on scapus. Dorsal surface of flagellum segments with solitary scale sockets and row of triangular spines near anterior margin (similar to fig. 4.28 in Novikova & Kluge 1994: 636).
Labrum more or less square-shaped with width/length ratio of 1.26–1.28; dorsal surface with 1+7–12 long stout setae, two setae situated apart above others, arranged mainly in one regular row; some smaller setae present on both margins laterally; dorsal surface of labrum covered with sparsely arranged small setae ( Fig. 9 View FIGURES 5 – 12 ).
Hypopharynx and maxilla typical for Takobia , without any distinguishing features, as compared to other species of group.
Right mandible with 8 incisors, without setae on outer margin; prostheca consists of two setae; row with about 10 relatively short setae below prostheca ( Fig. 7 View FIGURES 5 – 12 ). Left mandible with 7 incisors; prostheca with 8–9 teeth extended apically ( Fig. 6 View FIGURES 5 – 12 ).
Maxillary palp not long, its first segment not reaching apex of maxilla. Apex of maxillary palp covered only with short hair-like setae.
Labium with glossae somewhat shorter than paraglossae. Glossae with group of hair-like setae (up to 12) near apex on dorsal side. Outer and inner margins of apical half of glossae with sparse row of hair-like setae ( Figs 8 View FIGURES 5 – 12 a, 8b). Paraglossae with three irregular rows of long hair-like setae apically. Few additional hair-like setae also present near tip of paraglossae on dorsal and ventral sides. Segment I of labial palp with group of chloride cells near outer margin (more than 20). Segment II of labial palp with well-marked, small, rounded apicomedial projection; dorsal surface of segment II with row of 4–5 long setae centrally. Segment III nearly symmetrical, slightly rounded or elongated ( Figs 10–12 View FIGURES 5 – 12 ); strong pointed setae (up to 21) on surface and tip of segment III. Small hair-like setae present on all surfaces of labial palp.
Thorax. Pronotum with few diffuse, yellow smudges near forefront. Mesonotum usually with diffuse, yellow, V-shaped pattern, but sometimes unicolored. Hind wing pads present.
Legs light brown. Dorsal surface of femora darker near margins. Large, oval, light spot present at basal part of each femur. Chaetotaxy of all femora similar. External margins of femora each with sparse row of elongated, pointed stout setae (total number: 9–13, usually 11–12). Only two stout setae present at apex of external margin of all femora ( Figs 13–16 View FIGURES 13 – 17 ). Dorsal surface of femora covered by scales (similar on terga), small hair-like setae, trapezoidal scale sockets and chloride cells; some specimens without femoral scales. Internal margins of femora each with sparse row of middle-sized, pointed stout setae; sometimes this row situated only at basal half of margin. Tibiae usually somewhat darker than dorsal surface of femora. External margins of tibiae with solitary, middlesized, pointed bristles. Tarsal claws light brown, each with 10–14 denticles ( Fig. 17 View FIGURES 13 – 17 ).
Abdomen. Terga I–VIII light brown, without any pattern. Sterna dirty yellow ( Figs 1, 2 View FIGURES 1 – 4 ). Terga XI–X somewhat lighter, almost yellow; sterna unicolor dark yellow to light brown. Surface of terga covered by scales, small hair-like setae, chloride cells and trapezoidal scale sockets with corner operculae. Scales rounded or oval, with feathered margins and not elongated tips ( Figs 27–29, 31 View FIGURES 18 – 31 ). Some specimens without scales on surface of terga ( Fig. 30 View FIGURES 18 – 31 ). Posterior margin of tergum I without triangular spines; terga II–X with triangular spines ( Figs 27–31 View FIGURES 18 – 31 ). Surfaces of terga with faint meshwork. Posterior margins of sterna VII–IX with triangular spines; sterna I–VI without them.
Paraproct with middle-sized prolongation of posterior margin ( Figs 32, 33 View FIGURES 32 – 33 ). Inner margin of posterior half of paraproct covered with long stout spines, anterior half with smaller, but more numerous, spines. Margins and surface of paraproct prolongation also covered with stout spines. Surface of paraproct plate covered with scales, few trapezoidal scale sockets and small hair-like setae.
Gills almost oval, more elongate in specimens from crenal zone ( Figs 18–23, 25, 26 View FIGURES 18 – 31 ). Segment I without gills. Gills of segments II–VII nearly symmetrical. All gills transparent. Gills’ tracheation in specimens from crenal zone faint ( Figs 18–23, 26 View FIGURES 18 – 31 ), in specimens from rhithral zone distinct ( Fig. 25 View FIGURES 18 – 31 ). Scale sockets at outer sclerotized margins of gills not numerous and situated only on base of gills ( Fig. 24 View FIGURES 18 – 31 ).
Cerci and paracercus yellow, light brown in apical parts. Paracercus well-developed, as long as 3/5 of cerci length ( Figs 1, 2 View FIGURES 1 – 4 ). Anterior margins of segments of cerci and paracercus each with row of triangular spines, solitary groups of hair-like setae between them and row of scale sockets (similar to fig. 5.17 in Novikova & Kluge 1994: 638).
Male and female adults. Unknown.
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