Acroteriobatus omanensis

LAST, HENDERSON & NAYLOR, 2016


Oman Guitarfish
Classification: Elasmobranchii Rhinopristiformes Rhinobatidae

Reference of the original description
LAST, P.R. & HENDERSON, A.C. & NAYLOR, G.J.P. (2016)
Acroteriobatus omanensis (Batoidea: Rhinobatidae), a new guitarfish from the Gulf of Oman. Zootaxa, 4144 (2): 276–286

Types
Acroteriobatus omanensis
Holotype: CSIRO: H 7551-01; Paratype: CSIRO: H 7552-01 (desiccated slightly); SQU: uncatalogued;

Images of types

Description :


Citation: Acroteriobatus omanensis LAST, HENDERSON & NAYLOR, 2016: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 07/2017

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Acroteriobatus omanensis sp. nov., holotype, female 586 mm TL (CSIRO H 7551-01) © PETER R. LAST, AARON C. HENDERSON & GAVIN J.P. NAYLOR
Common names
eng Oman Guitarfish

Short Description
Original diagnosis after LAST, HENDERSON & NAYLOR, 2016 [24333]: A species of the genus Acroteriobatus distinguished by the following combination of characters in adults: wedge-shaped disc, width 29–33% TL, disc length 1.3–1.4 times width; short snout, angle 59–67o, length 2.6–3.0 times interspiracular distance, 4.0–4.4 times interorbital width; medium-sized orbit, 1.3–1.6 times spiracle length; nostrils oblique, their length 1.2–1.3 times internarial distance; preoral length 6.3–6.8 times internarial distance; anterior nasal flaps extending across internarial space and barely separated at mid-snout; posterior nasal flaps very broad; two well-developed spiracular folds, outermost fold distinctly taller than inner fold; ridges of rostral cartilage almost parallel, converging slightly anteriorly but not constricted medially; anterior cartilage sickle shaped, pointed posteriorly; distance between fifth gill slits 2.7–3.0 times in ventral head length; prebranchial sensory pore patch obvious, extending to first gill slit; postscapular sensory canal prominent, with exposed lateral pores, grooved; thorns patches on supraorbit, scapular region, and dorsal midline rudimentary, inconspicuous; pelvic-fin inner margin slightly longer than its base in males, lengths subequal in females; interdorsal distance 2.7– 3.2 times first dorsal-fin base; dorsal caudal margin 2.0–2.7 times preventral margin; upper jaw with ~86 tooth rows; ~185–188 post-synarcual centra; 37–42 nasal lamellae; dorsal disc greenish brown with dense pattern of small white ocelli and fainter darker brown blotches; margins of nasal flaps vivid red or orange; dorsal fins with small white spots; and caudal fin with two large dark blotches on each side (near fin base and on ventral lobe), and a prominent pair of dark saddles on caudal peduncle.

Distribution
Gulf of Oman, Arabian Sea (only from landings at Muttrah fish market (Muscat)) [24333]

Size / Weight / Age
497–601 mm TL (types) [24333]

Habitat
demersal; marine [24333]

Dentition
Teeth very small, blunt; crowns rhomboidal, acuspid; teeth quincuncial, in ~86 rows in upper jaw of holotype; upper and lower jaw teeth similar in shape and size, larger at symphysis than near corner of mouth. [24333]