Epeorus (Epeorus) unicornutus Braasch, 2006a
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publication ID |
https://doi.org/ 10.11646/zootaxa.4991.3.4 |
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publication LSID |
lsid:zoobank.org:pub:842EA450-A680-4D5D-9723-C1D7CCE13E5D |
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DOI |
https://doi.org/10.5281/zenodo.5042550 |
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persistent identifier |
https://treatment.plazi.org/id/039D87CC-FFA1-FF89-FF56-F931FD166E4F |
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treatment provided by |
Plazi |
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scientific name |
Epeorus (Epeorus) unicornutus Braasch, 2006a |
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Epeorus (Epeorus) unicornutus Braasch, 2006a View in CoL
( Figs 35–49 View FIGURES 35–42 View FIGURES 43–49 )
Material examined: 2 larvae, INDIA, Arunachal Pradesh, Lower Subansiri district, Pa stream 27.74791 N, 94.0346 E, 284.2 m, 14.vi.2017, colls. K. A. Subramanian and M. Vasanth [ZSI/ SRC-I / E 287 ] GoogleMaps ; 2 larvae, INDIA, Arunachal Pradesh, West Kameng district, Dirang, Showda village , Dirang river , 27.3267528 N, 92.231802 E, 1877 m, 13.iii.2018, coll. Bikramjit Sinha [ZSI/ SRC-I / E 296 ] GoogleMaps ; 2 larvae, INDIA, Arunachal Pradesh, Lower Dibang valley district, Roing, Iphipani river , 28.18728 N, 95.84094 E, 488 m, 04.iv.2016, coll. Santabala & Party [ZSI/ SRC-I / E 309 ] GoogleMaps .
Description: Mature larva: Body length 11.8 mm; length of cerci 12 mm. Body generally pale brown. ( Fig. 35 View FIGURES 35–42 ).
Head: Length 1.9 mm, width 2.8 mm; pale brown ( Fig. 35 View FIGURES 35–42 ); subrectangular; anterior and lateral margins convex, with rows of dense hair-like setae directed anteriorly; posterior margin slightly concave. Compound eyes blackish, antennal scape, pedicels and flagellum pale brown. Labrum wide, dark brown, anterior margin with 11–12 denticles, long hair-like setae laterally ( Fig. 39 View FIGURES 35–42 ). Hypopharynx as in Fig. 40 View FIGURES 35–42 . Mandible brown with scattered setae along the molar area; incisor serrated; outer incisor longer than inner incisor ( Figs 41– 42 View FIGURES 35–42 ). Maxilla as in Fig. 43 View FIGURES 43–49 . Labium: glossae broad with V-shaped separation, subtriangular; paraglossae slightly expanded laterally; apical segment of palp pointed, dorsal surface with dense row of comb setae ( Fig. 44 View FIGURES 43–49 ).
Thorax: Pronotum pale brown; mesonotum light brown ( Fig. 35 View FIGURES 35–42 ). Femora light brown with distinct patches; dorsal surface of all femora with two brown maculae medially ( Fig. 45 View FIGURES 43–49 ) and stout setae ( Fig. 45A View FIGURES 43–49 ); femora of distal end with a prominent pointed spine on all legs ( Fig. 45 View FIGURES 43–49 ). Claw with 4 denticles ( Fig. 46 View FIGURES 43–49 ).
Abdomen: Abdominal terga pale brown without special marks ( Fig. 35 View FIGURES 35–42 ); posterior margin of abdominal terga I–X each with a row of spines ( Figs 37– 38 View FIGURES 35–42 ); terga II–X with a single acute median and medially prominent pointed spine ( Fig. 35 View FIGURES 35–42 ); tergum X with short spines with minute hair-like setae on posterior margin ( Fig. 38 View FIGURES 35–42 ); terga II–VII with long posterolateral extensions ( Fig. 36 View FIGURES 35–42 ); sterna pale with brown markings of oblique stripes medially and medio-lateral stripes laterally. Lamellae of gill I somewhat extended beneath of abdomen ( Fig. 47 View FIGURES 43–49 ). Gills II–VII with anal rib straight ( Figs 48–49 View FIGURES 43–49 ); gill faces with exception of marginal parts brownish tinged with black. Cerci with row of small hair-like setae dorsally.
Diagnosis: The larva of Epeorus (E.) unicornutus can be distinguished from other species of this genus by the following combination of characters: (i) posterior margin of abdominal terga I–X each with a row of spines ( Fig. 35 View FIGURES 35–42 ); (ii) terga II–IX each with acute median and medially prominent pointed spine ( Figs 35–38 View FIGURES 35–42 ); (iii) tergum X with short spines with minute hair-like setae on posterior margin ( Fig. 38 View FIGURES 35–42 ) and (iv) anterior margin of labrum with 11–12 denticles ( Fig. 39 View FIGURES 35–42 ).
Distribution: Nepal, Thailand and India (Arunachal Pradesh).
Remarks: The larva of this species was described from Nepal by Braasch (2006a) and reported from Thailand by Boonsoong and Braasch (2013); we provide a supplementary larval description based on our material, which represents the first record of the species for India.
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.
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