Sepia vermicularis is known as the common cuttlefish or ink-fish in South Africa

South Africa

The Republic of South Africa is a country in southern Africa. Located at the southern tip of Africa, it is divided into nine provinces, with of coastline on the Atlantic and Indian oceans...

. It is endemic to this region.

Distribution

This cuttlefish is found around the South African coast from Saldanha Bay

Saldanha Bay

Saldanha Bay is a natural harbour on the south-western coast of South Africa, north west of Cape Town. The town that developed on the northern shore of the bay, also called Saldanha, was incorporated with five other towns into the Saldanha Bay Local Municipality in 2000. The current population of...

 to Algoa Bay

Algoa Bay

Algoa Bay is a wide inlet along the South African east coast, some 425 miles east of the Cape of Good Hope. It is bounded in the west by Cape Recife and in the east by Cape Padrone. The bay is up to 436 m deep...

, subtidally to at least 40m.

Description

The South African common cuttlefish has an elongated body with ten arms bearing rows of suckers. Two arms are elongated tentacles used for catching prey. Paired lateral fins extend the whole length of the body. The upper surface of the body is smooth, with rippling bars of colour and the animal is usually well camouflaged.

Ecology

This animal lives on reefs and feeds on shrimp

Shrimp

Shrimp are swimming, decapod crustaceans classified in the infraorder Caridea, found widely around the world in both fresh and salt water. Adult shrimp are filter feeding benthic animals living close to the bottom. They can live in schools and can swim rapidly backwards. Shrimp are an important...

 and small fishes. A gas-filled internal shell is used for buoyancy. The eggs are pea-like and black or white and are usually seen attached to sea fan

Sea fan

A gorgonian, also known as sea whip or sea fan, is an order of sessile colonial cnidarian found throughout the oceans of the world, especially in the tropics and subtropics. Gorgonians are similar to the sea pen, another soft coral. Individual tiny polyps form colonies that are normally erect,...

s. The animal is capable of rapid changes of colour for camouflage, threat displays or for communicating mating readiness. A male ready to mate will show dark brightly rippling colours as he approaches another cuttlefish. If the other cuttlefish is either a male cuttlefish or a non-receptive female, the other cuttlefish will also show dark brightly rippling colours as a threat display. If the other cuttlefish is a receptive female, her colours will remain pale and head-to-head mating will take place . It may also lift two arms above its head when disturbed, possibly as threat gesture.