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Rhynchobatus immaculatus  Last, ho & Chen, 2013

Taiwanese Wedgefish
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Rhynchobatus immaculatus
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Classification / Names Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

() > Rhinopristiformes (Shovelnose rays) > Rhinidae (wedgefishes) > Rhynchobatinae
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 / Climate / Range Ecology

Marine; pelagic-neritic.   Subtropical

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Northwest Pacific: confirmed from Taiwan; probably more widespread.

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 99.0 cm TL male/unsexed; (Ref. 94805)

Short description Morphology | Morphometrics

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).

Biology     Glossary (e.g. epibenthic)

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 Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator | Collaborators

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 Red List Status (Ref. 115185)

CITES (Ref. 94142)

Not Evaluated

Threat to humans

  Harmless




Human uses

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Internet sources

BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes (gen., sp.) | DiscoverLife | ECOTOX | Faunafri | Fishes of Iran | Fishtrace | GenBank(genome, nucleotide) | GloBI | GOBASE | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | National databases | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Scirus | SeaLifeBase | Tree of Life | Wikipedia(Go, Search) | World Records Freshwater Fishing | Zoobank | Zoological Record

Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 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).
Trophic Level (Ref. 69278):  3.5   ±0.6 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278):  .
Vulnerability (Ref. 59153):  Moderate to high vulnerability (52 of 100) .