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Notoraja sapphira, Sapphire Skate
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Notoraja sapphira
Male picture by
Séret, B./Last, P.R.
Elasmobranchii (sharks and rays) >
Rajiformes
(Skates and rays) >
Arhynchobatidae
(Softnose skates)
Etymology:
Notoraja:
Greek, noton = back + Latin, raja = fish, Raja sp. (Ref.
45335
)
;
sapphira:
From the Greek
sappheiros
in reference to its intense blue dorsal coloration resembling that of a dark sapphire (gemstone).
.
More on authors:
Séret
&
Last
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; benthopelagic; depth range 1195 - 1313 m (Ref.
81757
). Subtropical; 25°S - 35°S, 167°E - 169°E (Ref.
114953
)
West Pacific: Coral Sea and Tasman Sea. Known only from the five type specimens collected on the slopes of the Norfolk Ridge. Also from New Caledonia (Ref.
86942
, Ref.
114953
).
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 36.0 cm TL male/unsexed; (Ref.
81757
); 41.3 cm TL (female)
Short description
Morphology
|
Morphometrics
This medium-size (413 mm TL) species is distinguished by the following set of characters: heart-shaped disc with a short projected snout tip; disc slightly wider than long, its width 51-54% of TL, and length 47-48% TL; short snout, its preorbital snout length 12-15% TL, preoral snout length 12-15% TL; interorbital width 3.6-4.1% TL; interspiracular width 6.0-6.6% TL; long and slender tail, its length from posterior margin of cloaca to tip of tail 54-58% TL; dorsal surface of disc largely free of dermal denticles; rostrum with some denticles, without thorns; a small but distinct preorbital thorn on anterior upper orbital rim; denticles present on posterior mid-dorsal trunk; tail prickly with dense, irregular and randomly arranged thorns; mid-dorsal row on tail hardly distinct from the rest of thorn pattern; naked ventral surface of disc and tail; upper jaw with 29-36 tooth rows, lower with 28-32; pectoral-fin radials 67-70; monospondylous trunk centra 23-25; predorsal caudal diplospondylous centra 70-74; total number of centra 126-134; dorsal surface rich blue, uniform, with a narrow blackish outer margin; ventral surface of disc and tail brownish black, gill slits darker, cloaca opening and mouth corners whitish (Ref.
81757
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Séret, B. and P.R. Last
, 2009.
Notoraja sapphira
sp. nov. (Rajoidei: Arhynchobatidae), a new deepwater skate from the slopes of the Norfolk Ridge (South-West Pacific). Zootaxa 2153:24-34. (Ref.
81757
)
IUCN Red List Status (Ref.
130435
)
Data deficient (DD)
; Date assessed:
20 June 2017
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
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Estimates based on models
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5001 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00550 (0.00273 - 0.01106), b=3.10 (2.93 - 3.27), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 3.7 ±0.7 se; based on size and trophs of closest relatives
Resilience (Ref.
120179
): Low, minimum population doubling time 4.5 - 14 years (Preliminary low fecundity).
Fishing Vulnerability (Ref.
59153
): Low to moderate vulnerability (31 of 100).
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