Elasmobranchii (haaien en roggen) (sharks and rays)
(Electric rays) > Platyrhinidae
Etymology: Platyrhina: Greek, platys = flat + Greek, rhinos = nose. It is the same voice used for the Mammalian division made in Primates (Ref. 45335); tangi: Named for Chinese ichthyologist D.-S. Tang.
Environment: milieu / climate zone / depth range / distribution range
; marien; diepteverspreiding - m (Ref. ), usually - m (Ref. ). Temperate; 0°C - ; 40°N - 17°N, 106°E - 141°E (Ref. 114953)
Northwest Pacific: southern Japan (except the Ryukyu and Ogasawara Islands), southern Korea, China, Taiwan and northern Vietnam.
Length at first maturity / Size / Gewicht / Leeftijd
Maturity: Lm ?, range 42 - ? cm
Max length : 68.0 cm TL mannelijk/geslacht niet bekend; (Ref. 86259); 63.9 cm TL (female)
Morfologie | Morfometrie
This species is distinguished from its congeners in having the following set of characters: a row of thorns (weakly hooked, sometimes tubercle-like) on mid-dorsum of tail; no thorns on the anterior part of scapular region; thorns on the orbital, nape and scapular regions encircled by light yellow or white pigment; dorsal surface covered with minute and some clearly larger dermal denticles (coarse to touch) (Ref. 86259).
From studies on vertebral centra, it has been suggested that females attain a greater asymptotic total length (55.58 cm TL) and grew more slowly than males (45.52 cm TL) (based on specimens from Ariake Bay, western Kyushu Island, Japan). The maximum ages observed were 5 years for males and 12 years for females. Furthermore, it was also reported that females reached sexual maturity at a greater size than males (total length at 50% sexual maturity: males, 39.3 cm; females, 42.1cm). Parturition occurred from August to November followed immediately by mating, ovulation and fertilization. Largest specimen yet recorded (USNM 51295, 68.0 cm TL, Tokyo, sex unknown) with the largest specimens examined and collected from the Hyuga Nada Sea to be 63.9 cm TL for female, and 52.5 cm TL for male; however, the species is likely to grow larger than ca. 70.0 cm TL according to local Miyazaki fishermen (Ref. 86259).
Life cycle and mating behavior
Geslachtsrijpheid | Voortplanting | Kuitschieten | Eieren | Fecundity | Larven
Iwatsuki, Y., K. Miyamoto, K. Nakaya and J. Zhang, 2011. A review of the genus Platyrhina (Chondrichthys: Platyrhinidae) from the northwestern Pacific, with descriptions of two new species. Zootaxa 2738:26-40. (Ref. 86259)
Status op de Rode Lijst van het IUCN (Ref. 124695)
Gevaarlijk voor mensen
Gebruik door de mens
Leeftijd/GrootteGroeiLengte-gewicht parametersLengte-lengte parametersLengtefrequentiesMorfometrieMorfologieLarvenPopulatiedynamica van de larvenrecruteringAbundantieBRUVS
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 0.6250 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm total length, based on all LWR estimates for this body shape (Ref. 93245
Trophic level (Ref. 69278
): 3.4 ±0.4 se; based on size and trophs of closest relatives
Kwetsbaarheid (Ref. 59153
): Moderate to high vulnerability (47 of 100) .