Thraulus malabarensis Vasanth, Subramanian and Selvakumar, 2022
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publication ID |
https://doi.org/ 10.26515/rzsi/v122/i2/2022/168290 |
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persistent identifier |
https://treatment.plazi.org/id/2B7587A7-FFA7-9C37-FD4D-FA1EFC6B7AE7 |
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treatment provided by |
Felipe |
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scientific name |
Thraulus malabarensis Vasanth, Subramanian and Selvakumar |
| status |
sp. nov. |
Thraulus malabarensis Vasanth, Subramanian and Selvakumar sp. nov.
( Figures 33–56 View Figures 33–36 View Figures 37–42 View Figures 43–48 View Figures 49–56. 49 )
Material examined: Holotype: Mature larva, India, Kerala, Kannur District, Cheenkanni Puzha , Aralam WLS, 11.92121°N, 075.79362°E, 79.6 m, 12.ii.2021, colls. K. A. Subramanian and M. Vasanth (Reg. No. I /E/565) GoogleMaps . Paratypes: 5 larvae, same data as the holotype (Reg. No. I /E/566) GoogleMaps . 5 larvae, Kerala, Kannur District , Paripputhode, Aralam WLS, 11.97621° N, 075.82514° E, 122 m GoogleMaps ,
13.ii.2021, colls. K. A. Subramanian and M. Vasanth (Reg. No. I/E/567). Types are deposited in SRC/ZSI/Chennai.
Description (holotype): Mature larva. Body length 8.5–
9.0 mm, cerci 9.5–10.5 mm, median filament 11.0 mm ( Figure 33 View Figures 33–36 ).
Head: The head capsule and the area between the ocelli were washed in dark brown; the median line of the vertex was brown; and the clypeus margins were parallel.Labrum with straight posterior margin, dorsal surface with four rows of long hair-like setae, anterior part with thick spine-like setae; posterior-laterally rounded with small hair-like setae on apex; width of clypeus same as labrum; anteromedian emargination with small, blunt teeth medially and two large blunt teeth on either side ( Figures 37 and 38 View Figures 37–42 ). Lingua of hypopharynx with well-developed lateral processes; superlingua broad, short lateral projection on its arms ( Figures 39 and 40 View Figures 37–42 ). Mandibles with thin, hair-like setae laterally, smoothly curved with 10 long, hair-like setae on the anterior margin; prostheca of the left mandible with thicker spine-like setae, outer and inner incisors with 3 denticles each; prostheca of the right mandible with thin, spine-like setae, an outer incisor with 3 denticles, and an inner incisor with 2 denticles ( Figures 41 and 42 View Figures 37–42 ). Maxilla with dense, thick spines and thin setae on the anterior margin, an additional row of 15–16 simple setae present among these, and a large, thicker pectinate projection on the inner corner; outer margin of the maxilla with long, thin hair-like setae; palps 3 segmented, segment I 0.5x times longer than segment II, outer margin with few hair-like setae; segment III 0.2 times shorter than segment II, outer and inner margins of segment II with hair-like setae, segment III with tuft of hair-like setae apically ( Figures 43 and 44 View Figures 43–48 ). Glossa of labium with thick setae on the ventral surface, stout and hair-like setae on dorsal surface; paraglossa with thick stout setae on dorsal surface; segment I of labial palp with thick setae on inner and outer margins, segment II with few long hair-like setae on outer margin, an apical segment with a tuft of fine hair-like setae; surface with seven thick setae, segment I length ca. 1.5x times the length of segment II, segment III 0.7x times the length of segment II ( Figures 45 and 46 View Figures 43–48 ).
Thorax: Pronotum brown with black irregular markings on the dorsal surface. Mesonotum brown, median area brownish yellow with black markings ( Figure 33 View Figures 33–36 ). Legs yellowish brown with black maculae medially; fore femora with two rows of thick and long hair-like setae on anterior margin and two rows of long hair-like setae starts with proximal part to posterior margin; dorsal surface of the proximal region with bunch long hair-like setae ( Figure 48 View Figures 43–48 ); tibiae with black maculae distally, fine and stout setae on inner margin; mid and hind femur with two rows of long hair-like setae and small black maculae on proximally and the dark black band start from half of each femur; mid tibiae yellowish brown black maculae proximally ( Figure 49 View Figures 49–56. 49 ); hind tibiae mix with denser, stout and feathered setae on the surface; tarsi of all legs with thick setae on inner margin and small sparse setae on outer margins ( Figures 47, 48 View Figures 43–48 , 49 and 50 View Figures 49–56. 49 ). Claws with a row of 10 denticles ( Figure 51 View Figures 49–56. 49 ).
Abdomen: Abdomen yellowish brown, with median pale stripe and pale paired patches on segments I–VIII. The paired square patches progressively reduce in size from anterior to posterior. Ventrally, the terga I–VII with paired dark brown squarish blotches ( Figure 34 View Figures 33–36 ). The markings in terga VIII–X are indistinct. Terga VII–IX with posterolateral projections, terga VIII–IX larger than terga VII. Gills on segments I–VII; gill I slender, lanceolate, ventral lamellae large fimbriate ( Figure 53 View Figures 49–56. 49 ); gills II–VII similar in shape, dorsal and ventral lamellae alike; each lamella oval and elongated with long marginal fringes, tracheae unbranched; ( Figures 54, 55 and 56 View Figures 49–56. 49 ). Caudal filaments with a whorl of setae on alternate segments; setae shorter than the length of the corresponding segment.
Adult: Unknown.
Etymology: The species named after the old, popular name of North Kerala.
Distribution: Kerala (Aralam WLS, Kannur).
Diagnosis: Thraulus malabarensis sp. nov. can be distinguished from other known species of the genus by the following combination of characters:
• anteromedian emargination of the labrum with small, blunt teeth medially and two large, blunt crenations on either side ( Figures 37 and 38 View Figures 37–42 ).
• superlingua of hypopharynx is broad with short lateral projection on its arms ( Figures 39 and 40 View Figures 37–42 ).
• abdominal terga VIII–IX with large posterolateral spines ( Figure 36 View Figures 33–36 ).
• claw with a row of 10 denticles ( Figure 52 View Figures 49–56. 49 ).
• The gill I is slender, lanceolate, ventral lamellae oval, fimbriate ( Figure 53 View Figures 49–56. 49 ).
• gills II–VII on tracheae unbranched ( Figures 54, 55 and 56 View Figures 49–56. 49 ).
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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