Ελασμοβράγχιοι (καρχαρίες και σαλάχια) (sharks and rays) >
Squaliformes (Sleeper and dogfish sharks) >
Squalidae (Dogfish sharks)
Etymology: Squalus: Genus name from Latin 'squalus' meaning shark (Ref. 6885, 27436); raoulensis: Named for its type locality, Raoul Island.
More on authors: Duffy & Last.
Environment: milieu / climate zone / εύρος βάθους / distribution range
Οικολογία
Θαλασσινό(ά) pelagic-oceanic; εύρος βάθους ? - 320 m (Ref. 58439). Tropical
Southwest Pacific: known only from the upper insular slope west of Napier Island (off Raoul Island) and north of Raoul Island on the Kermadec Ridge.
Μέγεθος / Βάρος / Age
Γεννητική Ωρίμανση: Lm ? range ? - ? cm
Max length : 68.1 cm TL αρσενικό/απροσδιόριστο; (Ref. 58439); 72.9 cm TL (female)
Short description
Κλείδες προσδιορισμού | Μορφολογία | Μορφομετρία
This species is distinguished by the following combination of characters: width of mouth 2.4 - 2.7 times horizontal prenarial length; direct pre-second dorsal length 3.6 - 4 times pectoral-fin anterior margin, 2.7 - 2.9 times dorsal caudal margin; preoral length 3 - 3.2 times horizontal prenarial length, 2.3 - 2.5 times internarial width; bifurcate anterior nasal flap; first dorsal fin upright and rounded apically; dorsal-fin spines not robust, width of exposed bases 0.6 - 0.7% TL: first dorsal-fin height 1.2 - 1.4 times its inner margin length; second dorsal-fin height 0.85 - 0.93 times its inner margin length; pectoral-fin anterior margin 1.7 - 1.8 times its inner margin length; preventral caudal margin 1.7 - 2.3 times inner margin of pelvic fin; caudal fin pale with strongly demarcated, whitish posterior margin, no caudal bar; flank denticles unicuspid; monospondylous centra 41-43, precaudal centra 84-85, total centra 112-113; maximum adult size at least 73 cm TL (Ref. 58439).
Body shape (shape guide): elongated.
Life cycle and mating behavior
Γεννητική Ωρίμανση | Αναπαραγωγή | Γεννοβολία | Αβγά | Γονιμότητα | Προνύμφες
Distinct pairing with embrace (Ref. 205).
Duffy, C.A.J. and P.R. Last, 2007. Squalus raoulensis sp. Nov., a new spurdog of the 'megalops-cubensis group' from the Kermadec Ridge. pp. 31-38. In P.R. Last, W.T. White and J.J. Pogonoski Descriptions of new dogfishes of the genus Squalus (Squaloidea: Squalidae). CSIRO Marine and Atmospheric Research Paper No. 014. 130 pp. (Ref. 58439)
IUCN Red List Status (Ref. 130435: Version 2025-1)
Threat to humans
Harmless
Human uses
αλιεία: με δυνητικό ενδιαφέρον
Εργαλεία
Special reports
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Διαδικτυακές πηγές
Estimates based on models
Phylogenetic diversity index (Αναφ.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00347 (0.00165 - 0.00730), b=3.09 (2.92 - 3.26), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
Τροφικό Επίπεδο (Αναφ.
69278): 4.3 ±0.3 se; based on size and trophs of closest relatives
Ελαστικότητα (Αναφ.
120179): Χαμηλό, ελάχιστος χρόνος για διπλασιασμό πληθυσμού 4,5 - 14 έτη (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Moderate to high vulnerability (49 of 100).
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