Glyptothorax maceriatus, a new sisorid catfish from Mizoram, northeast India

Glyptothorax maceriatus, new species, is described from the Meghna-Surma River system in Mizoram, northeast India by 

Dr Heok Hee Ng, 

Tropical Marine Science Institute, National University of Singapore 

and 

Dr Lalramliana, 

Department of Zoology, Pachhunga University College, 

Mizoram, India. 

The species differs from most congeners in the Indian subcontinent in having thoracic adhesive apparatus with a narrow elliptic central depression that is almost enclosed posteriorly by skin ridges. The following combination of characters serve to distinguish it from congeners in the Indian subcontinent: nasal barbel not reaching anterior orbital margin; interorbital distance 27.0–31.4% HL; head length 23.7–25.3% SL; head depth 12.5–14.2 % SL; thoracic adhesive apparatus with narrow elliptic central depression that is almost enclosed posteriorly by skin ridges (striae) and with single, non-diverging series of striae running along its edges; width of adhesive apparatus 55.8–72.1% its length; unculiferous ridges of adhesive apparatus not extending anteriorly onto gular region; absence of striae on first pectoral- and pelvic-fin elements; pectoral-fin length 20.7–24.9% SL; dorsal-spine length 13.0–17.1% SL; smooth posterior edge of dorsal spine; dorsal-to-adipose distance 17.8–23.6% SL; body depth at anus 11.3–13.8% SL; pelvic-fin length 15.9–19.1 % SL; length 

of anal-fin base 13.9–16.2% SL; caudal peduncle length 21.4–23.9% SL; and 

caudal peduncle depth 6.4–7.6% SL (3.1–3.4 times in its length).

Ref: Ng HH & Lalramliana (2012). Glyptothorax maceriatus, a new species of sisorid catfish (Actinopterygii: Siluriformes) from north-eastern India. Zootaxa 3416:44-52

Glyptothorax scrobiculus, a new species of sisorid catfish from Mizoram

       Glyptothorax scrobiculus, new species, is described from the Tuirial River and tributaries of the Tuivai River in Mizoram, northeast India. It differs from all congeners in having a furrow running along the entire length of the ventral surface of the pectoral spine. The significance of the furrow is briefly discussed, and it is thought to arise from the posterior expansion of the adhesive surface of the pectoral spine.

It further differs from congeners in having a combination of the following characters: eye diameter 7-8 % HL; interorbital distance 25-30 % HL; unculiferous ridges of thoracic adhesive apparatus not extending anteriorly onto gular region; depressed area in thoracic adhesive apparatus not wholly enclosed by ridges; head length 25.0-26.6 % SL; absence of striae on first pectoral- and pelvic-fin elements etc.

Ng HH & Lalramliana (2012). Glyptothorax scrobiculus, a new species of sisorid catfish (Osteichthyes: Siluriformes) from northeastern India. Ichthyological Exploration of Freshwaters 23 (1): 1-9

Glyptothorax jayarami, a new species of catfish (Teleostei: Sisoridae) from Mizoram, northeastern India

A new sisorid catfish, Glyptothorax jayarami, is described from the Kaladan basin of Mizoram, India by Ms Yumnam Rameshori and Prof Waikhom Vishwanath, Manipur University, Manipur, India.

 It is characteristic in having densely tuberculate skin; an elongate, ovoid thoracic adhesive apparatus with an oval central depression from which the ridges on the apparatus diverge; two blackish-brown blotches at caudal-fin base behind the hypural plate; well developed plicae on the ventral surfaces of simple and adjacent branched rays of pectoral and pelvic fins; a narrow caudal peduncle (5.5–7.9 % SL) and long 2 + 6–7 gill rakers on the first branchial arch.

Barilius profundus, a new cyprinid fish (Teleostei: Cyprinidae) from the Koladyne basin, India

Barilius profundus, a new species of bariline cyprinid fish is described from the Koladyne River, Mizoram, India by M. Dishma and Prof. W. Vishwanath, Manipur University, Manipur, India.

 

It is distinguished from congeners in having the following combination of characters: great body depth at dorsal-fin origin (32.0–37.3 % SL), 17–18 pre-dorsal scales, 7–10 dark blue bars on the sides of the body, 30–32 + 2–3 lateral line scales, ½7/1/2½ lateral transverse scales and 12 circumpeduncular scales.

Monopterus ichthyophoides, a new species of scaled swamp eel from Mizoram, India

Monopterus ichthyophoides is described from specimens collected from the Sawleng River and a public well at Luangmual, both in the Barak River drainage in Mizoram, India by Dr Ralf Britz, Department of Zoology, Natural History Museum, London, Mr HT Lalremsanga , Mr Lalrotluanga Department of Zoology, Mizoram University & Dr Lalramliana, Department of Zoology, Pachhunga University College.

Monopterus ichthyophoides differs from all other species of synbranchids in having only 2 branchiostegal rays (vs 5–6). It differs further from all other synbranchids, except M. cuchia, M. fossorius, M. indicus, and M. desilvai by the presence of scales. It differs from the latter four species also by the number of vertebrae (79–82 + 34–37 = 114–117 vs M. cuchia 99–112 + 55–70 = 166–188, M. fossorius 73 + 53-56 = 126 -129, M. indicus 93–99 + 42–45=137–144, M. desilvai 75 +69 =144). It differs further from M. cuchia in having the scales restricted to the posterior part of its body (vs extending anteriorly up to the head) and from M. desilvai and M. indicus in having scales extending anteriorly far beyond the vent (vs. ending posterior to vent in M. desilvai and M. indicus, but with a small separate scale patch in M. indicus)

Batasio convexirostrum, a new species of catfish (Teleostei: Bagridae) from Koladyne basin, India

Batasio convexirostrum, a new bagrid catfish, is described from the Koladyne drainage, Mizoram, India.  by A. DARSHAN, Directorate of Coldwater Fisheries Research (ICAR), Bhimtal-263 136, Uttarakhand, India with  N. ANGANTHOIBI and W. VISHWANATH, Department of Life Sciences, Manipur University, Canchipur-795 003, Manipur, India.

It is distinguished from congeners by a combination of the following characters: body with a dark-brown oblique predorsal bar on a uniform light-brown background; very short dorsal to adipose distance (1.7–4.1% SL); snout length 39.2–45.5% head length; eye diameter 24.6–29.8% head length; gill rakers on the first branchial arch 4–5; pectoral spine length 14.6–17.6% standard length; adipose-fin base length 31.0–34.9% standard length; post-adipose distance 10.6–13.7% standard length; branched pectoral fin rays 9–10; and 39–40 vertebrae. 

For more information:

http://www.mapress.com/zootaxa/2011/f/z02901p058f.pdf

Two New species of Glyptothorax from Mizoram

Two new species of Glyptothorax (Glyptothorax ater and Glyptothorax caudimaculatus) are described from the Koladyne basin of Mizoram State, India by Dr Nongmaithem Anganthoibi and Prof. Waikhom Vishwanath, Manipur University, Manipur.

Glyptothorax ater is distinguished from its congeners by the following combination of characters: dark brown body with two horizontal light creamish stripes, one each along mid-dorsal line and lateral lines; two pale creamish ovoid spots on either side of the dorsal-fin origin connected by thin creamish oblique stripes forming spectacle like mark; greatly arched predorsal profile; shorter nasal barbel not reaching anterior margin of eye; rhomboidal thoracic adhesive apparatus with a conspicuous central depression, longitudinally elongated and with a constriction at mid-length; ventral surfaces of the pectoral spine and two to four outer rays of the pelvic fin pleated.

Glyptothorax caudimaculatus is distinguished from its congeners by the following combination of characters: rhomboidal-shaped thoracic adhesive apparatus with its unculiferous ridges extending anteriorly onto the gular region; central depression on thoracic adhesive apparatus opening posteriorly in an inverted V-shaped form; sparsely granulated skin; papillated lips; long nasal barbel, its length being 35.2-43.3 % HL; acutely pointed snout; ventral surface of paired fin rays non-plaited; and posteriorly serrated pectoral-fin spine.

For more information see:

Two new species of Glyptothorax from the Koladyne basin, Mizoram, India (Teleostei: Sisoridae)

Nongmaithem Anganthoibi* and Waikhom Vishwanath*

Ichthyological Exploration of Freshwaters Volume 21 • Number 4 • December 2010