分類 / Names
俗名 | 同種異名 | Catalog of Fishes(屬, 種) | ITIS | CoL | WoRMS | Cloffa
Elasmobranchii
板鰓亞綱 (鯊魚與魟魚) (sharks and rays) >
Rhinopristiformes (Shovelnose rays) >
Rhinidae (Wedgefishes)
Etymology: Rhynchobatus: Greek, rhingchos = snout + Greek, batis, -idos = a sting ray (Raja sp.) (Ref. 45335); immaculatus: Name from Latin 'im' meaning not and 'macula' for spot, mark; based on the lack of a dark pectoral marking (rather than any white spots) which is otherwise present in small individuals of other nominal species of Rhynchobatus.
Environment: milieu / climate zone / depth range / distribution range
生態學
海洋. ; 23°N - 25°N, 120°E - 122°E (Ref. 114953)
分布
國家 | FAO區域 | 生態系 | 發現紀錄 | Point map | 簡介 | Faunafri
Northwest Pacific: confirmed from Taiwan; probably more widespread.
大小 / 重量 / 年齡
Maturity: Lm ? range ? - ? cm
Max length : 99.0 cm TL 雄魚/尚未辨別雌雄; (Ref. 94805)
簡短描述
檢索表 | 型態特徵 | 形態測量圖
This medium-sized species is distinguished by the following set of characters: snout is broad, and wedge-shaped; preoral snout 19-21% TL; small eye, its length 4.1-4.5 in preorbital snout; interorbital space 2.6-2.9 in preorbital snout; about 48 tooth rows; no spines from snout; supraorbital spines are small, well differentiated, and extending from preorbit to beyond end of spiracle; predorsal spines are relatively well developed; 2 disjunct rows of 6-9 small scapular spines on each side of the disc; predorsal space 48-49% of total length; origin of the first dorsal fin is well behind origin of pelvic-fin bases; total pectoral-fin radials 65-68; vertebrae with 28-30 monospondylous precaudal centra, 124-131 precaudal free centra, 38-42 diplospondylous caudal (free) centra, 165-170 total free centra, 179-184 total centra (including synarcual centra). Colouration: dark greenish brown dorsally with a few white spots scattered on pectoral disc; no black pectoral marking; prominent row of white spots start just forward of a single white spot (above pelvic-fin origin) and coalescing posteriorly to form a white mid-lateral line on tail; orbital membrane is white with dark bar over eye; no alternating light and dark markings on the interorbital space (Ref. 94805).
A benthic species that was recently discovered and not well known, but apparently lives in shallow water on the continental shelf. Probably feeds on bottom-dwelling crustaceans and fishes (Ref. 114953). Specimens caught are all immature that most probably the maximum length of this medium-size wedgefish could be less than 150 cm TL (Ref. 94805).
Life cycle and mating behavior
成熟度 | 繁殖 | 產卵場 | 卵 | 孕卵數 | 仔魚
Last, P.R., H.-H. Ho and R.-R. Chen, 2013. A new species of wedgefish, Rhynchobatus immaculatus (Chondrichthyes: Rhynchobatidae), from Taiwan. Zootaxa 3752(1):185-198. (Ref. 94805)
IUCN 瀕危狀態 (Ref. 130435: Version 2024-1)
極危 (CR) (A2bd); Date assessed: 03 December 2018
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5049 [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).
營養階層 (Ref.
69278): 3.5 ±0.6 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): High vulnerability (60 of 100).
