Glaucostegus obtusus


Widenose guitarfish
Classification: Elasmobranchii Rhinopristiformes Glaucostegidae

Reference of the original description
MÜLLER, J. & HENLE, F.G.J. (1841)
Systematische Beschreibung der Plagiostomen. Berlin, Veit, pp. 1–200

Image of the original description

Rhinobatos obtusus (MÜLLER & HENLE, 1841), valid as: Glaucostegus obtusus MÜLLER & HENLE, 1841

Synonyms / new combinations and misspellings
Rhinobatos obtusus, Rhinobatos (Glaucostegus) obtusus, Rhinobatus obtusus, Rhinobatus (Rhinobatus) obtusus

Glaucostegus obtusus

Rhinobatos obtusus
Syntype: MNHN: A-7855; MNHN: A-7857; MNHN: A-7912; MNHN: 3470; MNHN: A-8585; ZMB: 7589 ZSL: uncat., whereabouts unknown

Description :

Citation: Glaucostegus obtusus MÜLLER & HENLE, 1841: In: Database of modern sharks, rays and chimaeras,, World Wide Web electronic publication, Version 06/2019

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Glaucostegus obtusus MÜLLER & HENLE, 1841, from Marve, Malad, Mumbai, date of catch 22.10.2017, TL ca. 100 cm © Rohan Rao, India
Common names
eng Blunt shovel nose ray, eng Grey guitarfish, eng Widenose guitarfish

Short Description
Snout rather obtuse, rostrum ridge separated throughout its length. Width of the mouth about 1.9 times in snout length. One skinny projection from hind margin of spiracles. Back with small tubercles, and some spiniform. First dorsal fin well behind pelvic fin. The length of the nostril twice the width of the mouth and equal to internarial space. Colour : Body grey to brownish above, white below; large specimens have occasionally black blotch on back. [12520]

Indo-West Pacific: off Pakistan to the "Malay Archipelago"; and the "East Indies", with more specific records from the area not confirmed. South African records refer to Rhinobatos blochii and Rhinobatos leucospilus (Compagno pers. comm.). Source:

Exhibit ovoviparity (aplacental viviparity), with embryos feeding initially on yolk, then receiving additional nourishment from the mother by indirect absorption of uterine fluid enriched with mucus, fat or protein through specialised structures [733].

Size / Weight / Age
93.0 cm TL (male/unsexed; (Ref. 9909))

demersal; marine

shark-references Species-ID=14155;