Choroterpes ( Dilatognathus ) latus Vasanth, Kubendran & Subramanian, 2025
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publication ID |
https://doi.org/10.26515/rzsi/v125/i1/2025/172818 |
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persistent identifier |
https://treatment.plazi.org/id/863C3C63-8A6E-BE56-227A-2C989A6B84DD |
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treatment provided by |
Felipe |
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scientific name |
Choroterpes ( Dilatognathus ) latus Vasanth, Kubendran & Subramanian |
| status |
sp. nov. |
Choroterpes ( Dilatognathus) latus Vasanth, Kubendran & Subramanian sp. nov.
( Figs. 2, 5 View Figs , 8, 11 View Figs , 37-68 View Figs View Figs )
Materials examined: Holotype: 1 mature larva, INDIA,
Three new species of the subgenus Dilatognathus Kluge, 2012 ( Ephemeroptera : Leptophlebiidae : Atalophlebiinae )... Himachal Pradesh, Hamirpur, Godha River, 31.60984° N,
76.34765° E, 512 m, 19.iii.2021. Coll. T. Kubendran. I /E 871 Paratype: 20 larvae, same data as holotype I/E 872.
Description: Mature larva ( Fig. 2 View Figs ): body brownish yellow; length 6.5-7 mm; caudal filament 8.2-8.5 mm; antennae
2.2-2.4 mm ( Fig. 68 View Figs ).
Head: Head prognathous, yellowish brown with black markings; three distinct black-white ocelli with around distinct black colour markings. The upper layer of the head is slightly concave. Eyes with reddish and laterally black ( Fig. 8 View Figs ). Labrum wide, (2.8:0.8=width and length of middle) median emargination deep shallow with blunt crenation on anterior margin ( Fig. 37 View Figs ); dorsal surface with row of long numerous simple setae, small hair-like setae, lateral margin wide and ventral surface with long dense hair-like setae. Hypopharynx well-developed lateral process, lingua wide laterally, anterior margin deep V-shaped, superlingua rounded anterior and hands wide laterally ( Fig. 38 View Figs ). Mandibles moderately curved laterally with dense hair-like setae. Left mandible fused; outer and inner incisors with 3+3 teeth; inner incisor wider than outer; prostheca wide with long hair-like setae; inner incisor longer than outer incisor; margin between prostheca and mola concave; dorsal margin without any setae under mola; mola with 8 long, wide chamber with small setae ( Figs. 39-41 View Figs ). Right mandible: incisors fused; outer and inner incisors with 3+2 teeth; inner incisor slightly smaller than outer incisor; prostheca long hair-like setae; margin between prostheca and mola concave and gradually increase the mola convex; dorsal margin with 2-5 long setae under mola; outer margin with convex triangular and closely small chamber with medially stout setae ( Fig. 42 View Figs ). Maxilla long with palp III segmented; maxilla with inner-apical angle produced as long tusk-like process; palp elongated and bears long filtering simple setae; galea-lacinia outer margin convex and inner margin dense with long simple hair-like setae; Three new species of the subgenus Dilatognathus Kluge, 2012 ( Ephemeroptera : Leptophlebiidae : Atalophlebiinae )... crown inner and outer long hair-like setae; segment I inner margin convex and outer margin with stout setae; segment II inner side concave with 6 long, simple setae, outer side with 5-7 small setae; segment III apically wide with dorsal proximally transverse row of long setae, on inner side with a row of numerous long, simple hair-like setae, outer side with long simple setae apically ( Fig. 43 View Figs ). Labium; glossae wide, triangular apically with covered small stout setae; paraglossae wide, laterally expanded, dorsal surface with medium dense hair-like setae, small stout setae and anterior margin with rows of dense hair-like setae; palps elongated, III segmented, with long filtering, longitudinal setae; outer margin of segment I wide with a row of numerous small stout setae; outer margin of segment II with rows of long, simple hair-like setae and dorsal surface with a row of numerous long, simple hair-like setae; segment III long clavate apically, outer and inner margin with a row of numerous long, simple hair-like setae, dorsal surface with hair-like setae ( Figs. 44-46 View Figs ).
Thorax: Notum dorsally brownish yellow with diffuse black marking on lateral ( Fig. 2 View Figs ); slender humeral setae on prothorax ( Figs. 56, 57 View Figs ), ventral surface of each notum with irregular black markings medially ( Fig. 5 View Figs ). Legs yellowish with diffuse black colour; each femur with black markings on middle and apex; each tibia proximally with black colour marking. Foreleg: femur proximal, middle wide and distally narrow; dorsal surface feathered, long simple apically rounded setae; middle and distal with black marking and numerous simple apically rounded setae and anterior margin with long simple setae, apically rounded setae and long feathered setae; posterior margin with small stout and feathered setae; inner margin of the tibia with a row of long, simple setae; dorsal surface with row of irregular setae; outer margin with long hair-like setae; inner margin of tarsi with a row of simple setae, dorsal surface with small stout hair-like setae on outer surface ( Figs. 47-50 View Figs ); claw apically sharp with 12- 13 denticles, separate into 2 parts, basally 3 denticles and apically 9-10 blunt triangular denticles ( Fig. 55 View Figs ). Middle leg ( Figs. 51, 52 View Figs ): dorsal surface of femora with proximally small setae and long simple apically rounded setae near apex; anterior margin with long hair-like setae and irregular apically rounded setae in various lengths; posterior margin with long simple apically rounded setae and small stout setae; inner margin of tibia with small spine-like setae, outer margin with long hair-like setae, dorsal surface with simple apically rounded and hair-like setae; tarsi outer and inner margin with long hair-like setae and dorsally small stout setae; claw with 9-10 denticles, separate into 2 parts, basally 2-3 denticles and apically 6-7 denticles ( Fig. 53 View Figs ). Hind leg ( Fig. 54 View Figs ): dorsal surface of the femur with apically rounded setae of various lengths, small stout setae, anterior margin with long dense apically rounded setae and hair-like setae, posterior margin with numerous apically rounded setae; tibia inner and outer margin with rows of apically rounded setae and hair-like feathered setae, proximal of the dorsal surface with apically rounded setae and mixed with hair-like setae; inner and outer margin of tarsi with hair-like and small stout setae on the dorsal surface. Hind wing pad present.
Abdomen: Dorsal surface brownish yellow, posterior margin of segment I-IX brownish band, tergum X blackish brown, setae absent on all segments; posterolateral margins of abdominal terga I-VII without denticles and terga VIII-IX pointed denticles ( Fig. 2 View Figs ). Posterior margin of abdominal terga I-X with a row of spine-like denticles ( Figs. 58, 59 View Figs ); terga VII-IX with a row of long, spine-like denticles medially, sterna without denticles, sterna V-VII with black marking medially ( Figs. 5 View Figs , 11 View Figs ). Gills present on terga II-VII, black colour; each gill with two lamellae, gill II-VI with 6 apical processes, gill VII small with 5 apical processes; trachea well-developed ( Figs. 60- 67 View Figs ). Caudal filament yellowish with a whorl of setae on alternate segments; setae smaller than the length of the corresponding segment.
Adult: Unknown.
Etymology: The species is named Choroterpes ( Dilatognathus) latus with “latus ” chosen to denote its characteristic wide labrum. “Latus” derives from Latin, meaning “wide”. This naming convention reflects the prominent feature of the species and adds descriptive clarity to the taxonomic classification.
Distribution: Himachal Pradesh & Jammu Kashmir (UT) of India.
Diagnosis: Choroterpes ( D.) latus sp. nov. is similar to Ch. ( D.) nigella ( Kang & Yang 1994) , it can be differentiated from all other known species of the subgenus by the following combination of characteristics: (i) labrum-wide, median emargination deeply shallow with blunt crenation ( Fig. 37 View Figs ); (ii) lingua and superlingua wide laterally ( Fig. 38 View Figs ); (iii) maxillae with long setae under galea-lacinea and long tusk process ( Fig. 43 View Figs ); (iv) segment III of labial palp long and narrow compare to C. nigella ( Fig. 44 View Figs ); (v) ocelli around with distinct black colour markings ( Fig. 8 View Figs ); (vi) median and distal region of femora with black marking and numerous spatulate setae ( Figs. 47, 51, 54 View Figs ); (vii) claw with 11-12 blunt denticles, triangular ( Fig. 55 View Figs ).
Biological notes: The type-locality is in a remote area of 32 km from the district of Hamirpur, Himachal Pradesh ( Fig. 96 View Figure 96 ). The Godha River is mostly composed of gravel, sand and silt. The Godha River with 10.5-11.5 m wide and 3 m depth and has medium water current ( 2.2 m /sec.) on the eastern part of Western Himalaya. The water temperature ranges between 17-19°C (seasonal variations) and the pH is between 6.3 and 6.8. The larvae were collected at the stony bottom found edge of the Godha River.
| T |
Tavera, Department of Geology and Geophysics |
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