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Rhinobatos formosensis, Taiwan guitarfish
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Rhinobatos formosensis
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Krajangdara, T.
Elasmobranchii (sharks and rays) >
Rhinopristiformes
(Shovelnose rays) >
Rhinobatidae
(Guitarfishes)
Etymology:
Rhinobatos:
Greek, rhinos = nose + Greek, batis, -idos = a ray (Raja sp.) (Ref.
45335
)
.
More on author:
Norman
.
Issue
Considered as a junior synonym of
Rhinobatos schlegelii
in Last et al. 2016:459 (Ref.
108568
). This species page will be removed.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; demersal; depth range 0 - 119 m (Ref.
9909
). Subtropical
Western Pacific: off Taiwan and from the Philippines; about 2500 kilometers away, 2 specimens were caught in Thailand.
Length at first maturity / Size / Weight / Age
Maturity: L
m
 
?
, range 56 - ? cm
Max length : 73.0 cm TL male/unsexed; (Ref.
9909
); 63.0 cm TL (female)
Found inshore and offshore (Ref.
9909
). Ovoviviparous (Ref.
50449
). Biology little known (Ref.
9909
). Utilized where it occurs, but details lacking (Ref.
9909
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
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 (Ref.
50449
).
Compagno, L.J.V. and P.R. Last
, 1999. Rhinobatidae. Guitarfishes. p. 1423-1430. In K.E. Carpenter and V.H. Niem (eds.) FAO identification guide for fishery purposes. The living marine resources of the Western Central Pacific. Rome, FAO. (Ref.
9909
)
IUCN Red List Status (Ref.
130435
)
Not Evaluated
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
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Zoological Record
Estimates based on models
Preferred temperature (Ref.
123201
): 22.8 - 27.9, mean 25.3 °C (based on 130 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00295 (0.00151 - 0.00578), b=3.13 (2.96 - 3.30), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 3.7 ±0.4 se; based on size and trophs of closest relatives
Resilience (Ref.
120179
): Low, minimum population doubling time 4.5 - 14 years (Fec assumed to be <100).
Fishing Vulnerability (Ref.
59153
): Moderate to high vulnerability (49 of 100).
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mrius-barile
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