12 research outputs found
Glyptothorax chimtuipuiensis, a new species of catfish (Teleostei: Sisoridae) from the Koladyne basin, India
No full textAnganthoibi, N., Vishwanath, W. (2010): Glyptothorax chimtuipuiensis, a new species of catfish (Teleostei: Sisoridae) from the Koladyne basin, India. Zootaxa 2628 (1): 56-62, DOI: 10.11646/zootaxa.2628.1.4, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.2628.1.
Glyptothorax chimtuipuiensis Anganthoibi & Vishwanath 2010, new species
No full text<i>Glyptothorax chimtuipuiensis,</i> new species <p>(Figs. 1a–c)</p> <p> <b>Type material.</b> Holotype: MUMF 10022, 57.8 mm SL; India: Mizoram, Koladyne River at Kolchaw, Lawntlai District, 22°23′N, 92°57′E, K. Nebeshwar & party, 25 April, 2008.</p> <p>Paratypes: MUMF 10023, 6, 33.7–55.3 mm SL; data as for holotype; one paratype (46.0 mm SL) was dissected for osteology.</p> <p> <b>Diagnosis.</b> A species of short, stout <i>Glyptothorax</i>, with granulated skin; the dorsal profile is greatly arched anterior to the adipose fin; the dorsal spine is short and smooth, its length 5.1–8.9% SL; the pectoralfin length is 16.8–21.9% SL, the ventral surface of its first simple ray plaited; the adipose-fin base length is 22.1–27.3% SL; the thoracic adhesive apparatus is chevron shaped, wider than long, the median ridges of the apparatus perpendicular to its base, slightly diverging laterally (Fig. 1c), its base concave, open caudally, with a shallow depression at its posterior end followed by a small fold of skin.</p> <p> <b>Description.</b> See Table 1 for morphometric data. Body short, stout, compressed on caudal peduncle; dorsal profile rising evenly from tip of snout to dorsal-fin origin, slightly humped between occiput and dorsalfin origin, thereafter sloping slightly ventrad to end of caudal peduncle. Ventral profile flat, slightly concave up to ventral-fin origin, then sloping gently upward from end of pelvic-fin base to end of anal fin. Anus and urogenital openings located immediately anterior to anal-fin origin. Skin granular on dorsal and lateral surfaces of head and fin bases, becoming prominently wrinkled after fixation in 10% formalin. Head greatly depressed; snout truncate; mouth subterminal, lips broad, fleshy. Upper lip continuing into maxillary barbel, supported by a flap of skin. Upper jaw longer than lower; teeth on upper jaw in a single broad patch, those on lower jaw in two distinct patches interrupted by a fold of skin originating from lower lip. Eyes small, oval. Thorax with a chevron-shaped adhesive apparatus with 11–16 ridges, medially perpendicular to its base, slightly divergent laterally. Base of apparatus concave, open caudally, with a shallow depression at its posterior end followed by a small fold of skin.</p> <p>Barbels in four pairs: nasal barbel arising from internarial septum, reaching up to posterior margin of eye when adpressed; maxillary barbel supported by a large flap of skin, extending up to end of pectoral-fin base; outer mandibular barbel longer than inner, reaching gill opening.</p> <p>Dorsal fin located closer to snout than to caudal-fin base, its posterior margin straight, bearing I,6 rays. Dorsal spine short, weak, smooth, extending up to half of fin height. Pectoral fin with I,6,i rays, extending slightly posterior to vertical through dorsal-fin origin, its spine broad, serrated anteriorly with 7 serrae.Ventral surface of spine plaited with 4–11 oblique plicae, regularly arranged proximally, becoming irregular distally. Pelvic fin with i,3,i rays, extending slightly beyond vertical through adipose-fin origin, not reaching anal opening. Adipose fin long, its base 1.5–1.7 as long as that of dorsal fin, originating at vertical slightly in advance of anal fin origin. Anal fin with ii,8 rays, its anterior margin straight or slightly convex, posterior margin straight. Caudal fin emarginate, with i,7,8,i rays, appearing forked when wrinkled skin is folded.</p> <p>Occipital process in contact with first dorsal-fin pterygiophore. Vertebrae 20+15=35.</p> <p> <b>Coloration.</b> In 10% formalin: dorsal and lateral surfaces of head and body dark grey, ventral portion anterior to pelvic-fin origin cream-colored. Dorsal, pectoral, pelvic and anal fins with brown base and hyaline distal margins. Caudal fin brown, with a dark grey band at base; tips of lobes hyaline. Adipose fin yellowish grey with white edge. Maxillary and nasal barbels dark grey dorsally, their ventral portions cream-colored. Mandibular barbels cream-colored.</p> <p> <b>Distribution.</b> Known only from the type locality, the Chimtuipui River, a tributary of the Koladyne River at Mizoram (Koladan drainage), India (Fig. 2).</p> <p> <b>Etymology.</b> The species is named after the Chimtuipui River, its type locality.</p>Published as part of <i>Anganthoibi, N. & Vishwanath, W., 2010, Glyptothorax chimtuipuiensis, a new species of catfish (Teleostei: Sisoridae) from the Koladyne basin, India, pp. 56-62 in Zootaxa 2628 (1)</i> on page 57, DOI: 10.11646/zootaxa.2628.1.4, <a href="http://zenodo.org/record/5302284">http://zenodo.org/record/5302284</a>
Redescription of the striped catfish Mystus carcio (Hamilton) (Siluriformes: Bagridae)
No full textA. Darshan, N. Anganthoibi, W. Vishwanath (2010): Redescription of the striped catfish Mystus carcio (Hamilton) (Siluriformes: Bagridae). Zootaxa 2475: 48-54, DOI: 10.5281/zenodo.89387
FIGURE 3 in Redescription of the striped catfish Mystus carcio (Hamilton) (Siluriformes: Bagridae)
No full textFIGURE 3. Mystus vittatus, lateral view, EBS/ZSI/F-6140, 81.3 mm SL.Published as part of A. Darshan, N. Anganthoibi & W. Vishwanath, 2010, Redescription of the striped catfish Mystus carcio (Hamilton) (Siluriformes: Bagridae), pp. 48-54 in Zootaxa 2475 on page 51, DOI: 10.5281/zenodo.89387
FIGURE 3 in Batasio convexirostrum, a new species of catfish (Teleostei: Bagridae) from Koladyne basin, India
No full textFIGURE 3. Map showing collection localities of Batasio convexirostrum.Published as part of Darshan, A., Anganthoibi, N. & Vishwanath, W., 2011, Batasio convexirostrum, a new species of catfish (Teleostei: Bagridae) from Koladyne basin, India, pp. 52-58 in Zootaxa 2901 (1) on page 56, DOI: 10.11646/zootaxa.2901.1.4, http://zenodo.org/record/528486
Batasio convexirostrum Darshan & Anganthoibi & Vishwanath 2011, new species
No full textBatasio convexirostrum, new species (Fig. 1) Type material. Holotype: MUMF 9525, 88.1 mm SL; India: Mizoram state, Lunglei District, Mat River (tributary of Koladyne River) near Mat bridge, 22˚54’N 92˚52'E; A. Darshan & party, 27 April 2008. Paratypes: MUMF 9526 (11), 73.1–84.1 mm SL; same data as holotype. MUMF 9529 (6), 64.8–83.4 mm SL; India: Mizoram state, Koladyne River at Kolchaw, Lawntlai District; A. Drashan et al., 26 November 2009. Diagnosis. Batasio convexirostrum is distinguished from its congeners (except B. dayi, B. elongatus and B. procerus) in having a head and body coloration consisting of only a dark-brown vertical predorsal bar (vs. predorsal bar absent altogether, or if present, in combination with either a mid-lateral stripe, a dark-brown spot, or a series of vertical bars posteriorly) against a lighter-brown body. It differs from B. dayi in having a longer snout (length: 39.2–45.5% HL vs. 35.5–38.7% HL), a greater number of pectoral-fin rays (9–10 vs. 8) and vertebrae (39–40 vs. 36–38), and the dorsal fin dark grey at base and distal one-third, hyaline in between (vs. black, hyaline close to its base); and from both B. procerus and B. elongatus in having a shorter dorsal-to-adipose distance (1.7–4.1% SL vs. 4.4–14.2), and fewer gill rakers on the first branchial arch (4–5 vs. 9–27). Batasio convexirostrum further differs from B. procerus in having a greater eye diameter (24.6–29.8 vs. 17.2–22.6% HL), a deeper head (19.6–21.7% SL vs. 16.8–18.6), a longer snout (39.2–45.5% HL vs. 33.8–38.3) and a longer pectoral-spine (14.6–17.6% SL vs. 8.9– 13.2), a greater number of pectoral-fin rays (9–10 vs. 7–8), and fewer vertebrae (39–40 vs. 41–43); and from B. elongatus in having a deeper body (20.2–21.6% SL vs. 15.8–19.3) and a greater number of vertebrae (39–40 vs. 36–38). Description. Morphometric data of the holotype and 17 paratypes are given in Table 1. Body and head laterally compressed. Dorsal profile convex from tip of snout to origin of dorsal fin, then sloping gently ventrad towards caudal peduncle. Ventral profile roughly flat to anal-fin origin, then sloping gently dorsad from there to end of caudal peduncle. Median longitudinal groove on head reaching base of occipital process. Occipital process with a shallow median depression, long, reaching basal bone of dorsal fin, forking at posterior tip to articulate with anteriorly pointed first nuchal plate. Orbit with free margin located on dorsal half of head, not visible ventrally. Mouth inferior, lips fleshy, fimbriated, continuous at angle of mouth. Oral teeth villiform, in irregular rows on all tooth-bearing surfaces. Premaxillary tooth band rounded, with 5–6 rows of teeth. Vomerine tooth band continuous with four rows of teeth in middle, anteriorly convex, tapering posterolaterally; its lateral extent exceeds lateral extent of premaxillary. Dentary tooth band separated in middle, broader than premaxillary and vomerine at symphysis, postero-laterally tapering, reaching angle of mouth. Anterior nostril tubular. Gill membranes separated, free from isthmus, not overlapping. Gill opening wide, extending from post-temporal to beyond isthmus. Gill rakers short with 1+3=4 (1) or 1+4=5 (1) or 2+3= 5 (2) rakers on first branchial arch (Fig. 2). Barbels in four pairs. Maxillary barbel extending to posterior border of eye. Nasal barbel depressed at base, extending to anterior quarter of eye. Outer mandibular barbel longer than inner, originating posterolateral to latter. Inner mandibular barbel minute, extending to vertical through anterior margin of orbit. Dorsal fin with a spinelet, a spine and 7 (18) branched rays. Dorsal-fin origin in anterior one-third of body. Dorsal-fin spine short, straight, slender, its posterior edge with 5–6 serrae. Adipose fin long, anterior end not reaching base of last dorsal-fin ray. Pectoral fin with a stout spine and 9 (3) or 10 (15) branched rays, spine curved backwards, sharply pointed at distal tip, its posterior margin with 8 (1), 9 (2), 10 (4) or 11 (11) large serrae. Pelvic fin with i,5 (18) rays, tip of adpressed fin not reaching anal-fin origin. Anal fin with iv,8 (1), iii,9 (3), iv,9 (4) or iii,10 (10) rays. Caudal fin forked with i,7,8,i (18) principal rays, its upper lobe slightly longer than lower one. Skin smooth. Lateral line complete, midlateral. Osteology. Branchiostegal rays 6 (4). Vertebrae: 19+20 = 39 (2) or 19+ 21=40 (2). Ribs: 7 (4). Haemal arches formed from tenth vertebra backwards. Caudal fin with four hypural plates, two each on the upper and lower lobes, the first and third plates of almost equal size, largest in series; second smallest. Primary and secondary hypuropophyses fused. Procurrent rays on caudal fin 17 (4) and 15 (4), on upper and lower lobes respectively. Coloration. Body uniform light brown with a single dark-brown oblique predorsal bar, originating from first nuchal plate, extending slightly below lateral line. Belly creamy-white with minute, sparsely-scattered melanophores. Distal one-third and the base of dorsal fin dark brown due to heavy concentrations of melanophores on rays and interradial membranes. Distribution. The species is presently known only from the Koladyne River and the Mat River (a tributary of the former) in Mizoram State, India (Figs. 3–4). Etymology. The specific name is derived from the Latin convexus, meaning rounded/curving out; and rostrum, meaning snout: formed as an adjective.Published as part of Darshan, A., Anganthoibi, N. & Vishwanath, W., 2011, Batasio convexirostrum, a new species of catfish (Teleostei: Bagridae) from Koladyne basin, India, pp. 52-58 in Zootaxa 2901 (1) on pages 53-55, DOI: 10.11646/zootaxa.2901.1.4, http://zenodo.org/record/528486
Image 1. Glyptothorax burmanicus, ZSI F10877 in Osteology of some catfishes of the genus Glyptothorax (Teleostei: Siluriformes) of northeastern India
No full textImage 1. Glyptothorax burmanicus, ZSI F10877/1, holotype, 100.8mm SL, Burma: Sankha. A - lateral, B - thoracic adhesive apparatus, C - tooth band on jawPublished as part of Vishwanath, W., Darshan, A. & Anganthoibi, N., 2010, Osteology of some catfishes of the genus Glyptothorax (Teleostei: Siluriformes) of northeastern India, pp. 1245-1250 in Journal of Threatened Taxa 2 (11) on page 1249, DOI: 10.11609/JoTT.o1874.1245-50, http://zenodo.org/record/498647
Figure 3 in Osteology of some catfishes of the genus Glyptothorax (Teleostei: Siluriformes) of northeastern India
No full textFigure 3. Weberian lamina: A - ventral view of G. chindwinica (MUMF 9997); B - dorsal, C - ventral of G. ngapang (MUMF 6141); D - ventral view of G. botius (unscale) (MUMF 9520).Published as part of Vishwanath, W., Darshan, A. & Anganthoibi, N., 2010, Osteology of some catfishes of the genus Glyptothorax (Teleostei: Siluriformes) of northeastern India, pp. 1245-1250 in Journal of Threatened Taxa 2 (11) on page 1247, DOI: 10.11609/JoTT.o1874.1245-50, http://zenodo.org/record/498647
Mystus carcio Hamilton
No full textMystus carcio (Hamilton) (Fig. 1) Pimelodus carcio Hamilton, 1822: 181 (type locality: ponds in northern parts of Bengal). Pimelodus Batasius Hamilton, 1822: pl. 23, fig. 60 (figure and caption). Macrones vittatus Day, 1877: 448, Pl. XCIX Fig. 4 (in part). Mystus vittatus Shaw & Shebbeare, 1938: 94, text-fig. 93; Material examined. MUMF 9518, 9, 30.2–47.9 mm SL, India: Assam: Brahmaputra River at Guwahati, 26°11'59"N, 91°45'0 9"E; M. Shantakumar, 24 May, 2007. ZSI FF4081, 1 ex., 47.9 mm SL, same data as above. MUMF 9519, 17, 39.0–47.0 mm SL, same collection site as above, W. Vishwanath & party, 8 May, 2005. ZSI FF4080, 1 ex., 42.9 mm SL, same data as above. MUMF 9533, 4, 30.0–48.0 mm SL, wetlands of Comilla district, Bangladesh (Meghana basin), purchased in Agartala fish market, Tripura, India; W. Vishwanath, 12 October, 2009. Diagnosis. Mystus carcio differs from other known striped species of Mystus by its small adult size, maturing at 44.0 mm SL; adipose-fin base shorter than or equal to dorsal-fin base (8.5–11.9 % SL); pelvic fin reaching anal-fin origin; pectoral girdle with coracoid shield exposed ventro-laterally below pectoral fin; eyes rounded, large (25.6–30.7% HL), dorsally orientated on head; vomerine tooth-patch interrupted at midline. Description. Morphometric data are provided in Table 1. Dorsal profile rising evenly from tip of snout to origin of dorsal fin, then sloping gradually ventrally to end of caudal peduncle. Ventral profile slightly convex up to anal-fin origin, then rising gradually until end of caudal peduncle. Head depressed. Anterior cranial fontanel extending from level of posterior margin of nasal opening to line through posterior orbital margins, separated from posterior fontanel by a narrow epiphyseal bar. Posterior fontanel long, extending almost to base of occipital process. Supraoccipital process narrow, extending up to basal bone of dorsal fin. Eye rounded, large, dorsally orientated on head; in lateral view eye diameter accommodating half of head depth at eye. Mouth sub-terminal. Villiform teeth present on all tooth-bearing surfaces. Premaxillary tooth-band of equal width throughout, slightly curved backward. Vomerine tooth patch interrupted at midline, as wide as that of premaxillary, its lateral extensions slightly shorter than those of premaxillary. Dentary tooth band at symphysis much broader than those of premaxilla and vomer, tapering laterally towards corners of mouth. Gill opening wide, free from isthmus. First branchial arch with 6+17=23 (2) or 6+18= 24 (2) gill rakers. Vertebrae: 16 +16= 32 (2) or 17+15=32 (2). Ribs: 7 (4). First fully formed haemal canal appears on 10th vertebra. Branchiostegal rays: 8 (4). Skin smooth. Lateral line complete, mid-lateral in position. Barbels in four pairs, all flattened laterally. Maxillary barbel short, extending to middle of pelvic fin; nasal barbel long, reaching base of occipital process; outer mandibular barbel extending to middle of pectoral-fin spine when adpressed; inner mandibular barbel reaching base of pectoral spine. Dorsal-fin origin slightly anterior to middle of body, with a spinelet, a spine, and 7 branched rays; spine as long as three-fifths of dorsal-fin height, serrated posteriorly with 9–11 serrae. Adipose fin deeply incised posteriorly, its base shorter than or equal to dorsal-fin base. Pectoral fin with a spine and 5–7 branched rays; spine stout, curved backwards, with 10–14 strong, large serrae on posterior margin. Pectoral-fin distal margin almost straight. Pelvic fin with i, 5 rays, its distal tip reaching base of anal-fin origin. Anal fin with iii–v, 9–10 rays, originating opposite adipose-fin origin; first two simple rays minute, but visible in cleared and alizarin-stained specimens. Caudal fin deeply forked with i,7+8,i rays, its upper lobe longer, with 10 procurrent rays; lower lobe with 11. Sexually dimorphic: females with rounded genital papilla. Female of 44.0 mm SL found to bear eggs. Males bear an elongate genital papilla, more prominent, extending beyond anal-fin origin in mature individuals. Males usually smaller than females. Distribution. India: West Bengal and Assam (Ganga-Brahmaputra drainage), Bangladesh: Meghana basin in Comilla District. Coloration. In formalin, ground colour of body amber. Snout and supraorbital region dark brown, extending dorsally to posterior end of adipose fin. Three broad, dark-brown stripes on sides of body: the middle stripe with a pale line marking the lateral line, flanked by a dorsolateral and a ventrolateral stripe, with narrower, pale interspaces. Middle stripe originates immediately behind posterolateral corner of head, dorsolateral one from region of epiotic and lateral base of occipital process, ventrolateral one from distal tip of cleithral process. All the three stripes uninterrupted, extending posteriorly up to caudal-fin origin. A darkbrown tympanic spot present above pectoral-fin origin.Published as part of A. Darshan, N. Anganthoibi & W. Vishwanath, 2010, Redescription of the striped catfish Mystus carcio (Hamilton) (Siluriformes: Bagridae), pp. 48-54 in Zootaxa 2475 on pages 49-51, DOI: 10.5281/zenodo.89387
A new catfish, <i>Hara koladynensis</i> from northeastern India (Siluriformes: Erethistidae)
No full textA new Erethistid catfish species, Hara koladynensis is described from Koladyne River, Mizoram, India. It is distinguished from its congeners in having rough (vs. smooth or serrated) anterior margin of dorsal spine; shorter pre-anal length (58.5-60.9% SL vs. 63.2-75.2), longer head (36.0-38.3% SL vs. 24.8-34.2%), longer post-adipose distance (18.6-21.9% SL vs. 12.3-18.3), and deeper body (21.9-25.2% SL vs. 11.5-20.9)
