Squalus crassispinus  Last & , Edmunds & Yearsley

Fatspine spurdog
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Classification / Names Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (sharks and rays) > Squaliformes (Bramble, sleeper and dogfish sharks) > Squalidae (Dogfish sharks)
Etymology: Squalus: Latin, squalidus = pale, weak (Ref. 45335);  crassispinus: Name from Latin 'crassus' meaning fat or stout and 'spinus' for thorn, referring to the unusually stout dorsal-fin spines (Ref. 58437).   More on author: Last.

Environment / Climate / Range Ecology

Marine; pelagic-oceanic; depth range 187 - 262 m (Ref. 58437).   Subtropical

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 47.6 cm TL male/unsexed; (Ref. 58437); 58.0 cm TL (female)

Short description Morphology | Morphometrics

This small species of the 'megalops-cubensis group' is distinguished by the following characters: head width at mouth 9.9-11.3% TL; mouth width 2.1-2.4 times the horizontal prenarial length; direct pre-second dorsal length 3.7-4.2 times the pectoral-fin anterior margin, 2.6-2.8 times the dorsal caudal margin; preoral length 2.7-3.0 times the horizontal prenarial length, 8.3-9.2% TL; anterior nasal flap strongly bifurcate; first dorsal fin upright to raked; the exposed bases of dorsal-fin spines are very broad, 1.2-1.5% TL; both dorsal fins have short inner margins, first dorsal-fin height 1.3-1.7 times its inner margin length, second dorsal-fin height 1.1-1.3 times its inner margin length; pectoral-fin anterior margin 1.9-2.2 times its inner margin length; preventral caudal margin 2.4-4.6 times inner margin of pelvic fin; caudal fin pale with poorly demarcated, whitish posterior margin, caudal bar absent; flank denticles unicuspid; monospondylous centra 39-42 (mainly 40-41), precaudal centra 82-86, total centra 107-111 (mainly 109-110) (Ref. 58437).

Distribution Countries | FAO areas | Ecosystems | Occurrences | Introductions | Faunafri

Eastern Indian Ocean: northwestern Australia; probably occurs more widely in the eastern Indian Ocean.

Biology     Glossary (e.g. epibenthic)

Found at the lower continental shelf and upper continental slope (Ref. 58437).

Main reference Upload your references | References | Coordinator : Compagno, Leonard J.V. | Collaborators

Last, P.R., M. Edmunds and G.K. Yearsley, 2007. Squalus crassispinus sp. nov., a new spurdog of the 'megalops-cubensis' group' from the eastern Indian Ocean. p. 11-22. 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 p.

IUCN Red List Status (Ref. 90363)

  Data deficient (DD) 

Threat to humans

  Harmless




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FAO(Publication : search) | FisheriesWiki |

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Internet sources

BHL | Cloffa | BOLDSystems | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes (gen., sp.) | DiscoverLife | Faunafri | Fishtrace | GenBank(genome, nucleotide) | GOBASE | Google Books | Google Scholar | Google | IGFA World Record | iSpecies | PubMed | Scirus | SeaLifeBase | Tree of Life | uBio | Wikipedia(Go, Search) | World Records Freshwater Fishing | Zoobank | Zoological Record

Estimates of some properties based on empirical models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00387 (-0.15549 - 0.16324), b=3.08 (2.99 - 3.18), based on LWR estimates for this family-BS (Ref. 93245).
Trophic Level (Ref. 69278):  4.2   ±0.6 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278):  Low, minimum population doubling time 4.5 - 14 years (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153):  Moderate to high vulnerability (53 of 100) .
Price category (Ref. 80766):   .