Labiobaetis batakorum, 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/195D71DD-0C6E-4629-9D06-1D145E59EBEB |
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taxon LSID |
lsid:zoobank.org:act:195D71DD-0C6E-4629-9D06-1D145E59EBEB |
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treatment provided by |
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scientific name |
Labiobaetis batakorum |
| status |
sp. nov. |
1. Labiobaetis batakorum sp. nov. Figures 2 View Figure 2 , 3 View Figure 3 , 47a View Figure 47 , 52a View Figure 52 , 54a View Figure 54
Diagnosis.
Larva. Following combination of characters: A) dorsal surface of labrum with submarginal arc of 1 + 4 long, simple setae; B) labial palp segment II with a broad, thumb-like distomedial protuberance, segment III conical; C) fore femur rather broad, length ca. 3 × maximum width, dorsal margin with a row of ca. nine curved, spine-like setae; D) fore claw with 9-12 denticles; E) paraproct distally not expanded, with 11-18 stout marginal spines.
Description.
Larva ( Figs 2 View Figure 2 , 3 View Figure 3 , 47a View Figure 47 , 52a View Figure 52 ). Body length 4.5-4.7 mm; antenna approximately 2.5 × as long as head length.
Colouration. Head, thorax, and abdomen dorsally brown, head and thorax with bright, median, dorsal suture, thorax and abdomen with pattern as in Fig. 47a View Figure 47 , forewing pads with brown striation. Head, thorax, and abdomen ventrally light brown, legs transparent, femur with a distomedial brown spot and apex brown, tibia and tarsus distally brown ( Fig. 52a View Figure 52 ). Caudal filaments light brown with a dark brown band at ca. 1/2 of cerci.
Antenna with scape and pedicel subcylindrical, with well-developed distolateral process at scape ( Fig. 3f View Figure 3 ); flagellum with broad, lanceolate spines and fine, simple setae on apex of each segment.
Labrum ( Fig. 2a View Figure 2 ). Rectangular, length 0.7 × maximum width. Distal margin with medial emargination and a small process. Dorsally with long, fine, simple setae scattered over surface; submarginal arc of setae composed of 1 + 4 long, simple setae, the first two setae after the central seta are closely together. Ventrally with marginal row of setae composed of lateral and anterolateral long, feathered setae and medial long, bifid, pectinate setae; ventral surface with five short, spine-like setae near lateral and anterolateral margin.
Right mandible ( Fig. 2b, c View Figure 2 ). 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 slightly convex. Tuft of setae at apex of mola present.
Left mandible ( Fig. 2d, e View Figure 2 ). Incisors fused. Outer and inner sets of denticles with 4 + 3 denticles and one minute intermediate denticle. Prostheca robust, apically with small denticles and comb-shaped structure. Margin between prostheca and mola slightly convex, with minute denticles toward 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 absent.
Both mandibles with lateral margins almost straight. Basal half with fine, simple setae scattered over dorsal surface.
Hypopharynx ( Fig. 2f View Figure 2 ). Lingua longer than superlingua. Lingua approx. as broad as long; medial tuft of stout setae well developed, short; distal half not expanded. Superlingua rounded; lateral margin rounded; fine, long, simple setae along distal margin.
Maxilla ( Fig. 2g View Figure 2 ). Galea-lacinia with one simple, robust apical seta 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 4-5 long, simple setae. Maxillary palp 1.3 × as long as length of galea-lacinia; two segmented; palp segment II 1.2 × length of segment I; setae on maxillary palp fine, simple, scattered over surface of segments I and II; apex of last segment rounded, with slight excavation at inner distolateral margin.
Labium ( Fig. 2h View Figure 2 ). Glossa basally broad, narrowing toward apex; shorter than paraglossa; inner margin with 8-9 spine-like setae, distalmost seta much longer than other setae; apex with two long, robust, pectinate setae and one medium, robust seta; outer margin with 5-6 spine-like setae increasing in length distally; 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 two medium, simple setae in anteromedial area; dorsally with a row of four long, spine-like setae near inner margin. Labial palp with segment I 0.9 × 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 4-5 long, spine-like, simple setae near outer margin. Segment III conical; apex rounded; length 1.0 × width; ventrally covered with short and medium spine-like, simple setae and short, fine, simple setae.
Hind wing pads absent ( Fig. 3g View Figure 3 ).
Foreleg ( Fig. 3a, b View Figure 3 ). Ratio of foreleg segments 1.4:1.0:0.6:0.2. Femur. Length ca. 3 × maximum width. Dorsal margin with a row of ca. nine curved, spine-like setae; length of setae 0.13 × maximum width of femur. Apex rounded; with one pair of spine-like setae and some short, stout setae. Many stout, lanceolate setae scattered along ventral margin; femoral patch absent. Tibia. Dorsal margin with a row of short, spine-like setae and fine, simple setae, near margin some stout, apically rounded setae; on apex one longer, spine-like, apically rounded seta. Ventral margin with a row of curved, spine-like setae, on apex some spine-like, partly bipectinate setae and a tuft of long, fine, simple setae. Anterior surface scattered with stout, lanceolate setae. Patellotibial suture present on basal 1/2. Tarsus. Dorsal margin with a row of short, stout setae. Ventral margin with a row of curved, spine-like setae. Tarsal claw with one row of 9-12 denticles; distally pointed; with 5-7 stripes; subapical setae absent.
Tergum ( Fig. 3c View Figure 3 ). Surface with irregular rows of U-shaped scale bases and scattered micropores. Posterior margin of tergum IV with triangular spines, wider than long.
Gills ( Fig. 3d View Figure 3 ). 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 ca. 2/3 length of segment II. Gill IV as long as length of segments V and 2/3 VI combined. Gill VII as long as length of segments VIII and 1/3 IX combined.
Paraproct ( Fig. 3e View Figure 3 ). Distally not expanded, with 11-18 stout marginal spines. Surface scattered with U-shaped scale bases, fine, simple setae and micropores. Cercotractor with numerous small marginal spines.
Etymology.
Dedicated to the indigenous Batak people from Sumatra.
Distribution.
Indonesia: Sumatra.
Biological aspects.
The specimens were collected at altitudes from sea level to 280 m.
Type-material.
Holotype. Larva (on slide, GBIFCH 00592194), Indonesia, Sumatra Barat, Sawahlunto, stream, 275 m, 10.XI.2011, 00°41.33'S, 100°46.72'E, M. Balke leg. (UN5). Temporary deposited in MZL before definitely housed in MZB. Paratypes. 11 larvae (2 on slides, GBIFCH 00592195, GBIFCH 00592196, 7 in alcohol, GBIFCH 00515349, deposited in MZL; 2 in alcohol, GBIFCH 00515347, deposited in ZSM), same data as holotype.
Other material.
2 larvae (on slides, GBIFCH 00592200, GBIFCH 00592199, deposited in MZL), Indonesia, Sumatra Barat, Barung-Barung, 01°06.03'S, 100°29.12'E, 75 m, 24.V.2010, J.-M. Elouard leg.; 4 larvae (2 on slides, GBIFCH 00592197, GBIFCH 00592198, 2 in alcohol, GBIFCH 00515365, deposited in MZL), Indonesia, Sumatra Barat, Tarusan, upstream Tarusan, 01°13.62'S, 100°29.83'E, 10 m, 24.V.2010, J.-M. Elouard leg.
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