Warty Crab

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The Warty Crab (Eriphia verrucosa) belongs to the class of Crustaceans, subclass Malacrostacei, order Decapod, suborder Branchiuri. Granchio Favollo Eriphia verrucosa Crostacei Crab intotheblue.it

Il Granchio Favollo - The Warty Crab - Eriphia verrucosa - intotheblue.it

It is a species widespread in the Mediterranean, the Black Sea and the eastern Atlantic. It has an oval or cuoriforme-shaped carapace, up to 10 – 12 cm long, of reddish-brown colour on the back and ivory white on the belly, with finely notched front edge; the claws are sturdy and asymmetrical with black or brown ends.

It has predominantly nocturnal habits.

It is a mainly necrofaga species that feeds, in other words, of dead animals, but also of worms, molluscs and crustaceans. In spring it moves in the areas of surface, in waters less deep than 1 metre, the reproduction takes place between May and June.

Il Granchio Favollo - The Warty Crab - Eriphia verrucosa - intotheblue.it

Il Granchio Favollo – The Warty Crab – Eriphia verrucosa – intotheblue.it

Il Granchio Favollo - The Warty Crab - Eriphia verrucosa - intotheblue.it

Il Granchio Favollo – The Warty Crab – Eriphia verrucosa – intotheblue.it

The vast number of brachyuran crabs have internal fertilisation and mate belly-to-belly. For many aquatic species, mating takes place just after the female has moulted and is still soft. Females can store the sperm for a long time before using it to fertilise their eggs. When fertilisation has taken place, the eggs are released onto the female’s abdomen, below the tail flap, secured with a sticky material. In this location, they are protected during embryonic development. Females carrying eggs are called “berried” since the eggs resemble round berries. When development is complete, the female releases the newly hatched larvae into the water, where they are part of the plankton. The release is often timed with the tides. The free-swimming tiny zoea larvae can float and take advantage of water currents. They have a spine, which probably reduces the rate of predation by larger animals. The zoea of most species must find food, but some crabs provide enough yolk in the eggs that the larval stages can continue to live off the yolk. Granchio Favollo Eriphia verrucosa Crostacei Crab intotheblue.it

Once crabs have become juveniles, they will still have to keep moulting many more times to become adults. They are covered with a hard shell, which would otherwise prevent growth. The moult cycle is coordinated by hormones. When preparing for moult, the old shell is softened and partly eroded away, while the rudimentary beginnings of a new shell form under it. At the time of moulting, the crab takes in a lot of water to expand and crack open the old shell at a line of weakness along the back edge of the carapace. The crab must then extract all of itself  including its legs, mouthparts, eyestalks and even the lining of the front and back of the digestive tract – from the old shell. This is a difficult process that takes many hours, and if a crab gets stuck, it will die. After freeing itself from the old shell (now called an exuvia), the crab is extremely soft and hides until its new shell has hardened. While the new shell is still soft, the crab can expand it to make room for future growth.

(extract from Wikipedia)

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Fanino Cirivasi Fanino Cirivasi ha scritto / wrote 147 articoli / Posts.
Questo articolo è stato scritto il / This article was written on 02/04/2019