Elasmobranchii (sharks and rays) > Squaliformes
(Sleeper and dogfish sharks) > Somniosidae
Etymology: Scymnodon: scymnus, an ancient name for some kind of shark, derived from a Greek word meaning young animal, cub or whelp; odon (Gr.), tooth, referring to large, triangular cutting teeth on lower jaw of S. ringens. (See ETYFish); macracanthus: macro-, from makros (Gr.), long or large; acanthus (L.), from akantha (Gr.), thorn, referring to stout, prominent dorsal-fin spines. (See ETYFish).
More on author: Regan.
Environment: milieu / climate zone / depth range / distribution range
Marine; bathydemersal; depth range 650 - 920 m (Ref. 26346). Deep-water; 50°S - 54°S
Southeast Pacific: Straits of Magellan. Southwest Pacific: New Zealand (Ref. 26346). Southwest Atlantic: Argentina (Ref. 58839).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 68.0 cm TL male/unsexed; (Ref. 247)
soft rays: 0. Dark brown or blackish in color, dorsal fins with fairly prominent fin spines, moderately long snout, lanceolate upper teeth and bladelike lower teeth with short, oblique cusps, stocky body that tapers abruptly from pectoral region, and moderately large tricuspidate and tricarinate lateral trunk denticles (Ref. 247).
A rare species inhabiting lower continental slopes (Ref. 26346). Ovoviviparous (Ref. 205).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Ovoviviparous (Ref. 26346). Distinct pairing with embrace (Ref. 205).
Compagno, L.J.V., 1984. FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 1 - Hexanchiformes to Lamniformes. FAO Fish. Synop. 125(4/1):1-249. Rome, FAO. (Ref. 247)
IUCN Red List Status (Ref. 125652)
Threat to humans
Fisheries: of no interest
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 0.5313 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00167 - 0.00905), b=3.13 (2.94 - 3.32), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic level (Ref. 69278
): 4.0 ±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 (47 of 100) .
Climate Vulnerability (Ref. 125649
): (0 of 100) .