Labiobaetis gueuningi, Kaltenbach, Thomas & Gattolliat, Jean-Luc, 2019
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publication ID |
https://dx.doi.org/10.3897/zookeys.895.38576 |
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publication LSID |
lsid:zoobank.org:pub:11350FE9-21E6-4D7A-B1F9-16CE4639F406 |
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persistent identifier |
https://treatment.plazi.org/id/DEAD4F24-1884-4EDB-9CF6-2D0D78C94BE3 |
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taxon LSID |
lsid:zoobank.org:act:DEAD4F24-1884-4EDB-9CF6-2D0D78C94BE3 |
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treatment provided by |
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scientific name |
Labiobaetis gueuningi |
| status |
sp. nov. |
15. Labiobaetis gueuningi sp. nov. Figures 26 View Figure 26 , 27 View Figure 27 , 49c View Figure 49 , 52e View Figure 52 , 54a View Figure 54
Diagnosis.
Larva. Following combination of characters: A) dorsal surface with submarginal arc of 9-10 long, simple setae; B) maxillary palp with three segments; C) labial palp segment II with a broad thumb-like distomedial protuberance, segment III conical; D) fore femur rather broad, length ca. 3 × maximum width, dorsal margin with ca. 14 clavate setae, apically with minute serration; E) posterior margin of abdominal tergites with triangular spines, wider than long and with medial enhancement; F) paraproct distally not expanded, with 21-24 stout marginal spines.
Description.
Larva ( Figs 26 View Figure 26 , 27 View Figure 27 , 49c View Figure 49 , 52e View Figure 52 ). Body length 5.6 mm. Cerci length ca. 2/3 of body length. Terminal filament: length ca. 3/4 length of cerci.
Colouration. Head, thorax, and abdomen dorsally dark brown, head and thorax with bright median, dorsal suture, thorax and abdomen with lively pattern as in Fig. 49c View Figure 49 , forewing pads light brown with brown and bright striation. Head, thorax, and abdomen ventrally with pattern as in Fig. 52e View Figure 52 , femur with yellowish markings, distomedial brown spot, taupe dorsal margin and taupe apex, tibia and tarsus brown, caudal filaments taupe, with black band at ca. 1/2 of cerci.
Antenna with scape and pedicel subcylindrical, with well-developed distolateral process at scape; flagellum with lanceolate spines and fine, simple setae on apex of each segment.
Labrum ( Fig. 26a View Figure 26 ). Rectangular, length 0.8 × maximum width. Distal margin with medial emargination and a small process. Dorsally with medium, fine, simple setae scattered over surface; submarginal arc of setae composed of nine or ten medium to long, simple setae. Ventrally with marginal row of setae composed of lateral and anterolateral long, feathered setae and medial long, bifid, pectinate setae; ventral surface with four short, spine-like setae near lateral and anterolateral margin.
Right mandible ( Fig. 26b, c View Figure 26 ). Incisors fused. Outer and inner sets of denticles with 4 + 3 denticles and one minute intermediate denticle. Inner margin of innermost denticle with a row of thin setae. Prostheca robust, apically denticulate. Margin between prostheca and mola straight. Tuft of setae at apex of mola present.
Left mandible ( Fig. 26d, e View Figure 26 ). Incisors fused. Outer and inner sets of denticles with 3 + 3 denticles. Prostheca robust, apically with small denticles and comb-shaped structure. Margin between prostheca and mola straight, with minute denticles towards subtriangular process. Subtriangular process long and slender, above level of area between prostheca and mola. Denticles of mola apically constricted. Tuft of setae at apex of mola present.
Both mandibles with lateral margins almost straight. Basal half with fine, simple setae scattered over dorsal surface.
Hypopharynx ( Fig. 26f View Figure 26 ). Lingua approx. as long as superlingua. Lingua approx. as broad as long; medial tuft of stout setae poorly developed; distal half not expanded. Superlingua rounded; lateral margin rounded; fine, long, simple setae along distal margin.
Maxilla ( Fig. 26g View Figure 26 ). Galea-lacinia with two simple, robust apical setae under crown. Inner dorsal row of setae with three denti-setae, distal denti-seta tooth-like, middle and proximal denti-setae slender, bifid and pectinate. Medially with one bipectinate, spine-like seta and five medium to long, simple setae. Maxillary palp 1.3 × as long as length of galea-lacinia; three segmented; palp segment II approx. as long as segment I; setae on maxillary palp fine, simple, scattered over surface of segments I, II and III; palp segment III shorter than segment II; apex of last segment slightly pointed, without excavation at inner distolateral margin.
Labium ( Fig. 26h View Figure 26 ). Glossa basally broad, narrowing toward apex; shorter than paraglossa; inner margin with ten or eleven spine-like setae; apex with two long and one medium, robust, pectinate setae and one short, robust seta; outer margin with 5-7 spine-like setae; ventral surface with short, fine, simple and short, spine-like setae. Paraglossa sub-rectangular, curved inward; apex rounded; with three rows of long, robust, distally pectinate setae in apical area and one or two medium, simple setae in anteromedial area; dorsally with a row of six long, spine-like setae near inner margin. Labial palp with segment I 0,7 × length of segments II and III combined. Segment I ventrally with short, fine, simple setae. Segment II with broad thumb-like distomedial protuberance; distomedial protuberance 0.5 × width of base of segment III; inner and outer margin with short, fine, simple setae; dorsally with a row of four long, spine-like, simple setae near outer margin. Segment III conical; apex with small projection; length 0.9 × width; ventrally covered with short, spine-like, simple setae and short, fine, simple setae.
Hind wing pads absent.
Foreleg ( Fig. 27a, b, c, d View Figure 27 ). Ratio of foreleg segments 1.4:1.0:0.7:0.3. Femur. Length ca. 3 × maximum width. Dorsal margin with a row of ca. 14 clavate setae, apically with minute serration; length of setae 0.14 × maximum width of femur. Apex rounded; with one pair of clavate setae with apical minute serration and some short, stout setae. Many stout, lanceolate, apically rounded setae scattered along the ventral margin; femoral patch poorly developed. Tibia. Dorsal margin with a row of short, stout setae and fine, simple setae, along margin a row of lanceolate, apically rounded setae; on apex one long, clavate seta with minute apical serration. Ventral margin with a row of curved, spine-like setae, on apex some bipectinate, spine-like setae and a tuft of simple setae. Anterior surface scattered with stout, lanceolate setae. Patellotibial suture present on basal 2/3. Tarsus. Dorsal margin with a row of short, stout setae, on apex fine, simple setae. Ventral margin with a row of curved, spine-like setae. Tarsal claw with one row of ten or eleven denticles; distally pointed; with 5-6 stripes; subapical setae absent.
Tergum ( Fig. 27e, f View Figure 27 ). Surface with rows of U-shaped scale bases and scattered fine, simple setae. Posterior margin of tergum IV with triangular spines, wider than long and with medial enhancement.
Gills ( Fig. 27g View Figure 27 ). Present on segments I–VII. Margin with small denticles intercalating fine simple setae. Tracheae extending from main trunk to inner and outer margins. Gill I as long as length of segment II. Gill IV as long as length of segments V and VI combined. Gill VII as long as length of segments VIII and 1/3 IX combined.
Paraproct ( Fig. 27h View Figure 27 ). Distally not expanded, with 21-24 stout marginal spines. Surface scattered with U-shaped scale bases, fine, simple setae and micropores. Cercotractor with numerous small marginal spines.
Etymology.
Dedicated to Morgan Gueuning, who collected the specimens in Sumatra.
Distribution.
Indonesia: Sumatra.
Biological aspects.
The specimens were collected at altitudes of 840 m to 1,300 m in small to medium (0.5-5 m wide), shallow (7-40 cm deep) and slow to medium fast (velocity 0.2-0.8 m/s) streams in forest or in highly disturbed areas (agriculture, waste). The substrate was predominantly boulder, stones, gravel and sand with few patches of leaf litter of dead wood.
Type-material.
Holotype. Larva (on slide, GBIFCH 00422153), Indonesia, Sumatra, volcano Singgalang, River Airjernih, 00°24.12'S, 100°16.73'E, 840 m, 25.III.2014, M. Gueuning leg. Temporary deposited in MZL before definitely housed in MZB. Paratypes. 1 larva (in alcohol, GBIFCH 00422220, deposited in MZL), same data as holotype; 12 larvae (3 on slides, GBIFCH 00465243, GBIFCH00465244, GBIFCH 00465245, 8 in alcohol, GBIFCH 00515340, GBIFCH 00422884, GBIFCH 00422224, GBIFCH 00422195, GBIFCH 00422200, GBIFCH 00422190, GBIFCH 00422197, GBIFCH 00422793, deposited in MZL), Indonesia, Sumatra, volcano Singgalang, River Sianok, 00°19.95'S, 100°19.32'E, 1,150 m, 24.III.2014, M. Gueuning leg.; 1 larva (on slide, GBIFCH 00422205, deposited in MZL), Indonesia, Sumatra, volcano Sago, River Kaligain, 00°18.02'S, 100°40.13'E, 1,040 m, 05.IV.2014, M. Gueuning leg.; 2 larvae (in alcohol, GBIFCH 00422156, GBIFCH 00422114, deposited in MZL), Indonesia, Sumatra, volcano Singgalang, River Caruak, 00°22.93'S, 100°22.70'E, 1,300 m, 23.III.2014, M. Gueuning leg.; 5 larvae (in alcohol, GBIFCH 00422149, GBIFCH 00422147, GBIFCH 00422163, GBIFCH 00422182, GBIFCH 00422141, deposited in ZSM), Indonesia, Sumatra, volcano Singgalang, River Magyih, 00°23.55'S, 100°16.57'E, 845 m, 25.III.2014, M. Gueuning leg.; 1 larva (in alcohol, GBIFCH 00422108, deposited in ZSM), Indonesia, Sumatra, volcano Singgalang, River Magyih, 00°22.85'S, 100°17.65'E, 1,075 m, 26.III.2014, M. Gueuning leg.
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