Hemitrygon laevigata

CHU, 1960


Yantai stingray
Classification: Elasmobranchii Myliobatiformes Dasyatidae

Reference of the original description
CHU, Y.-T. (1960)
Cartilaginous Fishes of China. Republic of China (in Chinese): 225 pp.

Synonyms / new combinations and misspellings
Dasyatis laevigata, Dasyatis laevigatus

Types
Hemitrygon laevigata



Description :


Citation: Hemitrygon laevigata CHU, 1960: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 04/2019

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Common names
eng Yantai stingray

Short Description
This species is distinguished from its congeners by the following combination of characters: disc rhomboid, width 111.5–123.5% of length; snout broadly triangular, angle 108–120°, preorbital length 138.3–182.6% of interorbital width; amphioral length 225.0–288.6% of mouth width; internasal distance 51.7–69.6% of prenasal length; body and tail mostly naked; dorsal surface of disc usually naked, sometimes with single row of up to 3 thorns along midline of disc; tail relatively long, slender, whip-like beyond posteriormost spine, tail width 140.5–192.9% of its depth, tail length 135.6–227.1% of precloacal length; ventral tail fold long, slender, its length 35.2–62.1% of DW; preventral tail fold short, 105.0–116.8% of DW; dorsal tail fold elongate, low, much shorter than ventral tail fold; oral papillae 1–4 (mostly 3); intestinal spiral valve turns 16–18; total pectoral radials 98–103; prespine separate centra 87–96 [19595]

Distribution
Northwest Pacific: Known from the Yellow Sea and East China Sea off China, Taiwan and Japan, including the Goto Sea (Goto-Nada), Ariake Sea, and Tachibana Bay in Nagasaki Pref., and the Amakusa Sea (Amakusa-Nada) in Kumamoto Pref. [19595];

Biology
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]. Distinct pairing with embrace [17086].

Habitat
demersal; marine

Dentition
teeth pavement-like, in quincunx pattern with 34–49 rows in upper jaw and 35–54 in lower jaw in non-type specimens, sexually dimorphic, adult males with pointed teeth in both jaws, females and juvenile males with blunt teeth [19595];

Remarks
shark-references Species-ID=14618;