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Following the spine, there is a short and slight dorsal keel and a ventral fin fold. The skin is completely smooth, other than 2–6 small tubercles located before the spine in the largest individuals. The coloration is golden brown above, darkening between the eyes and on the last two-thirds of the tail, and white below, darkening towards the fin margins. Unlike all other stingrays in the
Pacific, the ventral tail fold is white rather than dark.
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are broad and triangular. The tail is whip-like, about as long as the disc, and bears 1 (sometimes 2) stinging spines on top. The spine has a short groove and typically measures 6.8 cm (2.7 in) long in males and 7.9 cm (3.1 in) in females, with 112 and 130 serrations respectively.
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The largest Izu stingray on record measures 42 cm (17 in) across. The pectoral fin disc is diamond-shaped, slightly wider than long, with gently convex forward margins and a blunt snout. The eyes are medium-sized and followed by large
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arrangement and are blunt in females and juveniles but somewhat pointed in mature males. A transverse row of 5 papillae (nipple-like structures), with the 2 outermost slimmer than the others, is found on the floor of the mouth.
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Schwartz, F.J. (2007). "Tail spine characteristics of stingrays (Order
Myliobatiformes) frequenting the FAO Fishing Area 61 (20°N 120°E–50°N 150°E) of the Northwest Pacific Ocean".
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disc and a whip-like tail with a low keel above and fin fold beneath. The fin fold is white, distinguishing the Izu stingray from all other
Pacific members of its family.
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Rigby, C.L.; Walls, R.H.L.; Derrick, D.; Dyldin, Y.V.; Herman, K.; Ishihara, H.; Jeong, C.-H.; Semba, Y.; Tanaka, S.; Volvenko, I.V.; Yamaguchi, A. (2021).
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322:. There are 35–41 tooth rows in the upper jaw and 37–39 tooth rows in the lower jaw; the teeth have a pavement-like
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262:. Found in shallow coastal waters, it is a fairly small species with a smooth, golden-brown, diamond-shaped
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The Izu stingray occurs only off the Izu
Peninsula on the eastern coast of the Japanese main island
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The Izu stingray was described by
Kiyonori Nishida and Kazuhiro Nakaya in a 1988 issue of the
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species inhabits waters close to shore, at depths of 10–20 m (33–66 ft).
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Virtually nothing is known of the natural history of the Izu stingray. It attains
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Fewer than 10 Izu stingrays are known to have been collected. The
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347:at a disc width of around 37 cm (15 in).
462:, a new stingray from the Izu Peninsula, Japan".
430:10.2305/IUCN.UK.2021-1.RLTS.T60155A124445088.en
357:International Union for Conservation of Nature
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458:Nishida, K. & K. Nakaya (1988). "
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359:(IUCN) has assessed this species as
416:IUCN Red List of Threatened Species
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649:IUCN Red List vulnerable species
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491:The Raffles Bulletin of Zoology
464:Japanese Journal of Ichthyology
276:Japanese Journal of Ichthyology
664:Taxa named by Kiyonori Nishida
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669:Taxa named by Kazuhiro Nakaya
16:Species of cartilaginous fish
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375:used by Japanese coastal
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75:Scientific classification
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293:Distribution and habitat
674:Fish described in 1988
423:: e.T60155A124445088.
365:caught unintentionally
285:refers to where the
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409:Hemitrygon izuensis
339:Biology and ecology
232:Hemitrygon izuensis
204:Hemitrygon izuensis
45:Conservation status
476:10.1007/BF02938422
351:Human interactions
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548:Dasyatis_izuensis
519:Dasyatis izuensis
511:Taxon identifiers
460:Dasyatis izuensis
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280:specific epithet
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186:H. izuensis
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24:Izu stingray
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434:. Retrieved
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264:pectoral fin
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227:Izu stingray
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138:Superorder:
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436:16 November
332:pelvic fins
309:Description
654:Hemitrygon
643:Categories
497:: 121–130.
383:References
361:Vulnerable
248:Dasyatidae
212:K. Nishida
173:Hemitrygon
162:Dasyatidae
128:Subclass:
60:Vulnerable
377:fisheries
316:spiracles
180:Species:
98:Kingdom:
92:Eukaryota
38:Holotype
587:10146365
528:Wikidata
373:set nets
324:quincunx
283:izuensis
270:Taxonomy
241:stingray
158:Family:
142:Batoidea
112:Chordata
108:Phylum:
102:Animalia
88:Domain:
65:IUCN 3.1
574:2419451
534:Q143837
301:. This
254:to the
252:endemic
243:in the
237:species
218:, 1988)
168:Genus:
148:Order:
118:Class:
63: (
626:271437
613:608120
600:564358
299:Honshū
278:. Its
245:family
216:Nakaya
214:&
621:WoRMS
582:IRMNG
561:347BX
320:nares
260:Japan
608:NCBI
595:ITIS
569:GBIF
438:2021
421:2021
371:and
330:The
225:The
556:CoL
543:ADW
472:doi
425:doi
367:in
258:of
239:of
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446:^
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229:(
210:(
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