Maculabatis ambigua

LAST, BOGORODSKY & ALPERMANN, 2016



Classification: Elasmobranchii Myliobatiformes Dasyatidae

Reference of the original description
LAST, P.R. & BOGORODSKY, S.V. & ALPERMANN, T.J. (2016)
Maculabatis ambigua sp. nov., a new whipray (Myliobatiformes: Dasyatidae) from the Western Indian Ocean. Zootaxa, 4154 (1): 66–78


Images of types

Description :


Citation: Maculabatis ambigua LAST, BOGORODSKY & ALPERMANN, 2016: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 09/2020

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Maculabatis ambigua sp. nov, immature male holotype SMF 35803 (492 mm DW, fresh, Red Sea, Jizan, Saudi Arabia): dorsal surface and ventral surface of disc © LAST, BOGORODSKY & ALPERMANN, 2016
Common names
eng Baraka’s Whipray

Short Description
Original diagnosis after LAST, BOGORODSKY & ALPERMANN, 2016 [24370]: A species of the genus Maculabatis distinguished by the following combination of features: disc rhomboidal with its axis of greatest width well forward, snout tip to maximum disc width 37% (35–39%) DW; preorbital snout short with small apical lobe, rather obtuse, snout angle 121–127°; pectoral-fin apices narrowly rounded, angle 86–92°; orbits moderately small, protruding slightly; mouth relatively narrow, width 6.2–7.0% DW; pelvic fins small, length 17–19% DW, width across base 13–14% DW; preoral snout length 2.8–3.1 times internasal width, 19–21% DW, interorbital distance 2.0–2.2 times orbit length, prenasal length 2.2–2.4 times internasal width; tail behind caudal sting subcircular with longitudinal ventral groove; tail weakly depressed posteriorly with longitudinal lateral ridge on each side in subadults; one enlarged, seed-shaped, suprascapular thorn usually followed by up to five much smaller primary denticles in adults (suprascapular thorn may be preceded by a few much smaller primary denticles in early juveniles); band of secondary denticles suboval (in subadults), very broad (its width across scapulocoracoid much narrower than its width at spiracles), with sharply-defined lateral margins, broad and semi-truncate near tail base; band fully developed and covering entire dorsal surface of tail by 49 cm DW; dorsal surface mainly uniformly brownish, disc margin paler brown dorsally; ventral disc uniformly whitish, not obviously black edged; in subadults, darker dorsal surface of tail sharply demarcated from slightly paler ventral surface (median furrow dark and contrasted with skin adjacent); in juveniles, dorsal post-sting tail with conspicuous, alternating, black-and-white saddles that persist nearly to tail tip, ventral tail uniformly greyish; pectoral-fin radials 130–135; total vertebral count (excluding first synarcual centra) 108–116, monospondylous centra 44–46, pre-sting diplospondylous centra 64–67.

Distribution
Collected at the Mkokotoni market, Zanzibar (Tanzania) and in the Red Sea off Jizan, southern Saudi Arabia [24370]

Size / Weight / Age
Medium-sized whipray with largest known specimen, female ~840 mm DW. Birth size probably slightly less than 200 mm DW [24370]

Habitat
demersal; marine; depth range 10–60 m [24370]

Dentition
Teeth of paratype (KAUMM 019) small, subequal in size in upper and lower jaws; rhombic with flattened crowns in upper jaw, smaller with ridged crowns in lower jaw. Tooth rows (paratype KAUMM 019) ~36 in upper jaw (holotype not dissected) [24370]

Remarks
shark-references Species-ID=14689;