Labiobaetis bakerae, Kaltenbach & Gattolliat, 2020
|
publication ID |
https://dx.doi.org/10.3897/zookeys.914.47067 |
|
publication LSID |
lsid:zoobank.org:pub:48A5290E-75D7-4FB0-BF5A-6784DB8624E5 |
|
persistent identifier |
https://treatment.plazi.org/id/8394FCC0-7343-44F8-B6BF-D06FC34B30C0 |
|
taxon LSID |
lsid:zoobank.org:act:8394FCC0-7343-44F8-B6BF-D06FC34B30C0 |
|
treatment provided by |
|
|
scientific name |
Labiobaetis bakerae |
| status |
sp. nov. |
Labiobaetis bakerae sp. nov. Figures 1 View Figure 1 , 2 View Figure 2 , 10a View Figure 10 , 14 View Figure 14 , 15c View Figure 15
Diagnosis.
Larva. Following combination of characters: A) dorsal surface of labrum with submarginal arc of 13-15 long, clavate setae; B) labial palp segment II with a broad, thumb-like distomedial protuberance, segment III slightly pentagonal; C) left mandible without setae at apex of mola; D) fore femur rather broad, length 3.4 × maximum width, dorsal margin with 8-11 curved, spine-like setae; E) paraproct distally expanded, with 34-39 marginal, stout spines.
Description.
Larva (Figs 1 View Figure 1 , 2 View Figure 2 , 10a View Figure 10 ). Body length 3.5-4.3 mm; antennae and cerci broken.
Colouration. Head, thorax and abdomen dorsally brown; head and thorax with bright median, dorsal suture. Head, thorax and abdomen ventrally light brown; femur ecru, with brown dorsal margin and brown ventrodistomedial spot, tibia and tarsus brown, caudal filaments ecru.
Antenna (Fig. 2g View Figure 2 ) with scape and pedicel subcylindrical, with poorly developed distolateral process at scape.
Labrum (Fig. 1a View Figure 1 ). Rectangular, length 0.6 × 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 13-15 long, clavate setae. Ventrally with marginal row of setae composed of anterolateral long, feathered setae and medial long, bifid setae; ventral surface with four short, spine-like setae near lateral and anterolateral margin.
Right mandible (Fig. 1b, c View Figure 1 ). 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 and distolaterally denticulate. Margin between prostheca and mola straight, with minute denticles. Tuft of setae at apex of mola present.
Left mandible (Fig. 1d, e View Figure 1 ). 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 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 absent.
Both mandibles with lateral margins almost straight. Basal half with fine, simple setae scattered over dorsal surface.
Hypopharynx (Fig. 1f View Figure 1 ). Lingua approx. as long as superlingua. Lingua longer than broad; medial tuft of stout setae well developed; distal half laterally expanded. Superlingua straight; lateral margin rounded; fine, long, simple setae along distal margin.
Maxilla (Fig. 1g View Figure 1 ). 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 3-4 medium, simple setae. Maxillary palp 1.5 × as long as length of galea-lacinia; 2-segmented; palp segment II 1.5 × length of segment I; setae on maxillary palp fine and simple, scattered over surface of segments I and II; apex of last segment rounded, with excavation at inner distolateral margin.
Labium (Fig. 1h View Figure 1 ). Glossa basally broad, narrowing toward apex; shorter than paraglossa; inner margin with five spine-like setae increasing in length distally; apex with two long and one medium, robust, pectinate setae; outer margin with five long, spine-like setae; ventral surface with fine, simple, scattered setae. Paraglossa sub-rectangular, curved inward; apex rounded; with three rows of long, robust, distally pectinate setae in apical area and two or three medium, simple setae in anteromedial area; dorsally with a row of three long, spine-like setae near inner margin. Labial palp with segment I 0.8 × length of segments II and III combined. Segment I with fine, simple setae along margins. Segment II with broad, thumb-like distomedial protuberance; distomedial protuberance 0.6 × width of base of segment III; inner and outer margins with short, fine, simple setae; dorsally with one or two long, spine-like seta near outer margin. Segment III slightly pentagonal; apex rounded; length 1.1 × width; ventrally covered with short, spine-like, simple setae and short, fine, simple setae.
Hindwing pads absent.
Foreleg (Fig. 2a, b, c View Figure 2 ). Ratio of foreleg segments 1.3:1.0:0.6:0.2. Femur. Length ca. 3 × maximum width. Dorsal margin with a row of 8-11 curved, spine-like setae; length of setae 0.29 × maximum width of femur. Apex rounded; with one pair of curved, spine-like setae, one or a few short stout setae and some fine, simple setae. Stout, lanceolate setae scattered along the ventral margin; femoral patch absent. Tibia. Dorsal margin with a row of stout, apically rounded setae, apically one longer, apically rounded seta. Ventral margin with a row of curved, spine-like setae, on apex a few stout, spine-like, partly bipectinate setae and a tuft of fine, simple setae. Anterior surface scattered with stout, lanceolate setae. Patellotibial suture present on basal 1/3 area. Tarsus. Dorsal margin almost bare. Ventral margin with a row of curved, spine-like setae. Tarsal claw with one row of 9-11 denticles; distally pointed; with two stripes; subapical setae absent.
Terga (Fig. 2d View Figure 2 ). Surface with rows of U-shaped scale bases and scattered fine, simple, setae. Posterior margin of tergum IV with triangular spines, wider than long.
Gills (Fig. 2e View Figure 2 ). Present on segments II - VII. Margin with small denticles intercalating fine simple setae. Tracheae partly extending from main trunk towards outer and inner margins. Gill IV as long as length of segments V and 1/3 VI combined. Gill VII as long as length of segments VIII and 1/4 IX combined.
Paraproct (Fig. 2f View Figure 2 ). Distally expanded, with 34-39 stout marginal spines. Surface scattered with U-shaped scale bases, fine simple setae and micropores. Cercotractor with small marginal spines.
Etymology.
Dedicated to Dr. Kate Baker (University of Exeter, UK), who collected the specimens in Brunei.
Distribution.
Brunei (Fig. 15c View Figure 15 ).
Biological aspects.
The specimens were collected in pools of small lowland forest streams at an altitude of 100 m (Fig. 14 View Figure 14 ).
Type-material.
Holotype. Larva (on slide, GBIFCH 00592236), Brunei, Temburong District, Ulu Temburong National Park, Belalong River (near field station), 04°33.07'N, 115°09.41'E, 100 m, V. 2014, K. Baker leg. Deposited in MZL. Paratypes. 2 larva (on slides, GBIFCH 00658097, GBIFCH 00658084), same data as holotype; 5 larvae (on slides, GBIFCH 00592299, GBIFCH 00592296, GBIFCH 00592282, GBIFCH 00284241, GBIFCH 00592298), Brunei, Temburong District, Ulu Temburong National Park, 04°32.77'N, 115°09.52'E, V. 2014, K. Baker leg.; 3 larvae (on slides, GBIFCH 00592297, GBIFCH 00592295, GBIFCH 00592294), Brunei, Temburong District, Ulu Temburong National Park, 04°32.92'N, 115°09.45'E, V. 2014, K. Baker leg. All material deposited in MZL.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.