How to Identify Gummy Shark

To identify Gummy Shark (Mustelus antarcticus), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Dorsal surface typically grey to grey-brown, often with small, indistinct white spots (more prominent in juveniles). Ventral surface is white or pale.

Scale type

placoid

Mouth position

inferior

Distinctive features

Slender, elongated body, Flattened head with a short, rounded snout, Large, oval eyes, Absence of dorsal fin spines, Pavement-like teeth, blunt and rounded, adapted for crushing, Five gill slits, with the last two over the pectoral fin origin

Dorsal fin

Two dorsal fins of similar size; the first dorsal fin originates over the pectoral fin axil, and the second dorsal fin originates over the anal fin. No spines present.

Tail fin

Asymmetrical caudal fin with a well-developed ventral lobe and a distinct subterminal notch on the upper lobe.

Pectoral fin

Broad and triangular, moderately large.

Distinctive fins

Anal fin present, smaller than the second dorsal fin.

Identification Tips

1. 1

   Teeth

   Unlike many sharks with sharp, pointed teeth, Gummy Sharks possess blunt, pavement-like teeth, which are a key identifier.

2. 2

   Dorsal Fins

   Absence of spines on both dorsal fins distinguishes it from some other shark species.

3. 3

   Coloration

   Grey to grey-brown dorsal surface, often with small white spots (especially in juveniles), and a white belly.

4. 4

   Snout

   Short and rounded snout.

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