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Slipper lobster

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Slipper lobsters belong to a family called Scyllaridae. They are a group of about 90 different species. These creatures are achelate crustaceans, which means they belong to a specific group of shell-covered animals. They live in all the warm oceans and seas across our planet.

Pariibacus japonicus
Pariibacus japonicus

While they have "lobster" in their name, they are not true lobsters. They are actually more closely related to spiny lobsters and furry lobsters. They are easily recognized by their unique appearance and specialized body parts.

The body of a slipper lobster is built with specific segments. They have six segments in the head and eight segments in the thorax, which is the middle part of the body. A thick carapace, or hard outer shell, covers these segments for protection.

Scyllarus arctus 2 by Line1
Scyllarus arctus 2 by Line1

The six segments of the abdomen each have a pair of pleopods, which are swimming legs. Their thoracic appendages consist of either walking legs or maxillipeds, which are parts used for feeding. On the head, they have various mouthparts and two distinct pairs of antennae.

These antennae serve two very different purposes for the animal. The first pair are called antennules. These are held on long, flexible stalks and help the lobster sense its environment. The second pair are the most famous feature of the Scyllaridae family. These antennae are expanded and flattened into large, wide plates. These plates extend horizontally forward from the head, giving them a shovel-like appearance.

Slipper lobsters go through a complex life cycle to reach adulthood. After they hatch from their eggs, the young go through about ten different stages called instars. During these stages, they are known as phyllosoma larvae. These larvae are planktonic, meaning they drift in the ocean currents, and they look like leaves. This larval stage lasts for most of a year. Eventually, the larva moults into a "nisto" stage, which lasts a few weeks. After this, they grow into adults through a series of moults.

Because of their unique shapes, different species have many different names. Some people call them shovel-nosed lobsters or locust lobsters. In Australia, many species are called "bugs," such as the Moreton Bay bug and the Balmain bug.

Pariibacus japonicus
Pariibacus japonicus

Other names include "mitten lobster" for the Parribacus genus and "fan lobster" for the Ibacus genus. In Greece, they are sometimes called Kolochtypes, which translates to "bum hitter." This variety of names shows how much different cultures interact with these animals.

Slipper lobsters play a role in the ocean food web. They are bottom dwellers that live on continental shelves at depths of up to 200 meters. They eat many types of animals, including molluscs like limpets, mussels, and oysters. They also eat crustaceans, polychaetes, and echinoderms.

Scyllarus FIGIS 1957 2007
Scyllarus FIGIS 1957 2007

Because they lack the giant neurons that allow other crustaceans to perform fast tailflips, they must use other defenses. They rely on their heavily armoured exoskeleton and often bury themselves in the sand to hide. Their main predators are bony fish, such as the grey triggerfish in the Mediterranean Sea.

Humans also interact with these lobsters through fishing. All species in the Scyllaridae family are edible. Some are very important for commerce, such as the Balmain bug.

Scyllarus FIGIS 1957 2007
Scyllarus FIGIS 1957 2007

In 1991, the global catch was reported at 15,000 tonnes. More recently, annual production has reached about 20,000 tonnes, mostly from the production of Thenus orientalis in Asia. Fishermen use different methods depending on where the lobsters live. They use trawling for species that like soft sand, but they use scuba divers to catch species that hide in reefs and caves.

The history of these animals can be traced through fossils. The fossil record for slipper lobsters goes back 100 to 120 million years. This is a shorter history than that of their relatives, the spiny lobsters.

Pariibacus japonicus
Pariibacus japonicus

Scientists have found a fossil called Cancrinos claviger in Upper Jurassic sediments. This fossil is at least 145 million years old. It may be an ancestor to modern slipper lobsters or a close relative to the Scyllaridae family.

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🖼️ Images & Media (4)
Scyllaridae larvae - MBA.webm
File:Scyllarus FIGIS 1957 2007.svg
Scyllarus FIGIS 1957 2007.svg
File:Pariibacus japonicus.jpg
Pariibacus japonicus.jpg
File:Scyllarus arctus 2 by Line1.jpg
Scyllarus arctus 2 by Line1.jpg
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