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Mustelus stevensi, Western spotted smoothhound
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Mustelus stevensi
Picture by
Krajangdara, T.
Classification / Names
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| Catalog of Fishes(
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,
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) |
ITIS
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Cloffa
Elasmobranchii (sharks and rays) >
Carcharhiniformes
(Ground sharks) >
Triakidae
(Houndsharks) > Triakinae
Etymology:
Mustelus:
Latin for weasel, an ancient name for sharks, possibly referring to the pointed snouts, swift movements and/or rapacious feeding behavior of smaller predatory sharks [strictly not tautonymous with
Squalus mustelus
Linnaeus 1758 since type was designated by the ICZN]. (
See ETYFish
)
;
stevensi:
In honor of John Stevens (b. 1947), Senior Principal Research Scientist, CSIRO Marine and Atmospheric Research (Australia), who has “dedicated a lifetime to researching sharks around the world, and who has contributed greatly to our knowledge of sharks and rays in Australia”. (
See ETYFish
)
.
More on authors:
White
&
Last
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; benthopelagic; depth range 69 - 735 m (Ref.
124465
). Tropical
Eastern Indian Ocean: tropical, from northwest Australia to southern Indonesia and the Andaman Sea.
Length at first maturity / Size / Weight / Age
Maturity: L
m
75.1
, range 58 - 91.9 cm
Max length : 128 cm TL male/unsexed; (Ref.
124465
); 103.4 cm TL (female)
Short description
Morphology
|
Morphometrics
This moderately large species is disinguished by the following characters: palatine processes of the palatoquadrates not subdivided at the symphysis; pre-second dorsal length 58.1-61.4% TL; upper labial furrows are longer than lower furrows, upper ones 1.7-2.3% TL and 1.3-1.7 times lowers; buccopharyngeal denticles cover entire tongue and roof of mouth; reproductive mode aplacental viviparity; adults are without any hypercalcification of skeletal elements; dorsal fins moderately large and upright, first dorsal-fin anterior margin 13.0-15.7% TL, height 8.5-10.3% TL; claspers of adults are moderately long, inner length 8.1-11.2% TL; teeth in about 72/75 files; precaudal vertebral centra 75-91, monospondylous centra 33-41; small white spots usually present on the dorsal surfaces of body, including along lateral line; dorsal fins often with dark apical margins; caudal-fin terminal lobe white tipped (Ref.
124465
).
Recorded litter size litter sizes of 5-17 pups with size at birth likely to be around 28.0 cm TL (Ref.
124465
).
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
White, W.T., S. Arunrugstichai and G.J.P. Naylor
, 2021. Revision of the genus
Mustelus
(Carcharhiniformes: Triakidae) in the northern Indian Ocean, with description of a new species and a discussion on the validity of
M. walkeri
and
M. ravidus
. Mar. Biodiversity 51(42):1-24. (Ref.
124465
)
IUCN Red List Status (Ref.
130435
)
Least Concern (LC)
; Date assessed:
02 August 2018
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
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Estimates based on models
Preferred temperature (Ref.
123201
): 13.5 - 20.4, mean 16.5 °C (based on 27 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00224 (0.00105 - 0.00478), b=3.14 (2.97 - 3.31), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 3.7 ±0.4 se; based on size and trophs of closest relatives
Resilience (Ref.
120179
): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153
): Very high vulnerability (77 of 100).
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