Eastern spotted gummy shark

Eastern spotted gummy shark
Conservation status
	; Data Deficient (IUCN 3.1)[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Order:	Carcharhiniformes
Family:	Triakidae
Genus:	Mustelus
Species:	M. walkeri
Binomial name
	Mustelus walkeri; W. T. White & Last, 2008

The eastern spotted gummy shark (Mustelus walkeri) is a species of houndshark in the family Triakidae, found in Australian waters. This new species of gummy sharks is a relatively large species with the following characteristics: tall dorsal fins, its posterior margin directed posteroventrally from top to bottom and not upright distally, first dorsal-fin base is 1.6-2.0 times the anal-caudal space; buccopharyngeal denticles cover entire palate and floor of mouth; long claspers of adult males are slender, strongly depressed, the inner length about 9-10% TL, extending to just anterior of the second dorsal-fin origin; lower edge of spiracle is usually close to level of mid-eye; insertion of anal-fin usually over its apex; about 69/73 teeth rows; 78- 94 precaudal vertebral centra; 35-39 monospondylous centra; dorsal color pale greyish with numerous small, often indistinct, semi-regular, diffuse-edged white spots on postspiracular head and body; light and dark tonal coloration well demarcated on head below eye and onto middle of first gill slit, the intergill membranes are much darker dorsally than ventrally; bases and inner lobe of dorsal fins in juveniles (<400 mm TL) not strongly contrasted to distal part of fin, inner lobe is pale-edged; juveniles have caudal fin with distinctive whitish posterior margins.[2]

References

Kyne, P.M. (2011). "Mustelus walkeri". IUCN Red List of Threatened Species. 2011. Retrieved 23 May 2014.CS1 maint: ref=harv (link)old-form url
White, W.T. and P.R. Last, 2008. Description of two new species of gummy sharks, genus Mustelus (Carcharhiniformes: Triakidae) from Australian waters. In Last, P.R., White, W.T. & Pogonoski, J.J. (eds.): Descriptions of New Australian Chondrichthyans. CSIRO Marine and Atmospheric Research Paper no. 22.

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[1] Kyne, P.M. (2011). "Mustelus walkeri". IUCN Red List of Threatened Species. 2011. Retrieved 23 May 2014.CS1 maint: ref=harv (link)old-form url

[2] White, W.T. and P.R. Last, 2008. Description of two new species of gummy sharks, genus Mustelus (Carcharhiniformes: Triakidae) from Australian waters. In Last, P.R., White, W.T. & Pogonoski, J.J. (eds.): Descriptions of New Australian Chondrichthyans. CSIRO Marine and Atmospheric Research Paper no. 22.