Squat lobster

Squat lobsters live in the deep sea.

They have flat bodies. They look like a mix of a crab and a lobster. They have long tails that curl under them.

These animals have big claws. They use the claws to catch food. They also use them to look scary to enemies.

Many squat lobsters live in big groups. They like to stay near things like shipwrecks. This helps them find food and hide.

There are more than 900 kinds of squat lobsters. They live in oceans all over the world.

Squat lobsters are small sea animals. They live in oceans all over the world.

These animals are shaped like a mix of a crab and a lobster. Their bodies are flat from top to bottom. They have a long tail called a pleon. This tail curls under their main body. Their main body part is called a cephalothorax. This part is covered by a hard shell called a carapace. Some squat lobsters have a pointy part on their shell called a rostrum. Many species also have tiny hairs called setae. These hairs can sometimes look shiny.

Squat lobsters have many different parts. They have two pairs of antennae. They also have five pairs of legs called pereiopods. The first pair of legs are very large. These are called chelipeds. They end in big claws. These claws can be six times longer than the body! They use these claws to catch food. They also use them to look big to enemies.

Many squat lobsters live in big groups. They like to find spots with lots of food. They might gather near shipwrecks or deep sea vents.

Some squat lobsters live in the deep sea. Others live near the ocean surface. One kind even lives in caves above the sea! There are more than 900 known species. Scientists think there may be over 1,000 species in total.

Squat lobsters are fascinating sea creatures that live in oceans all over the world. They are part of a group called Anomura, which includes hermit crabs and mole crabs. These animals are shaped like a mix between a true lobster and a crab. Their bodies are flattened from top to bottom, a shape known as being dorsoventrally flattened. They can be found in many different places in the ocean. Some live near the surface, while others live near deep hydrothermal vents. One amazing species even lives in caves above sea level.

A squat lobster's body has two main parts. The first part is the cephalothorax, which is the head and chest combined. This part is covered by a hard shell called a carapace. The second part is the pleon, or the abdomen. The pleon is usually curled tightly under the cephalothorax. The cephalothorax has 19 segments, though they are hard to see. It also has many appendages, like antennae and mouthparts. These mouthparts do more than just handle food. They can also help the animal sort through sediment or gather particles.

Scientists have studied these animals to learn about their many different types. There are more than 900 described species in about 60 different genera. If we include the Aeglidae family, that number rises to over 1,000 species. In 2020, a study found that these creatures are even more diverse than we once thought. This study described 16 new species in the Leiogalathea genus. Researchers also found that there are fewer species in the Atlantic Ocean than in the Pacific Ocean. These discoveries help us understand how life is spread across our blue planet.

Squat lobsters have many special tools for living in the sea. Their most noticeable legs are the first pair, called chelipeds. These legs end in claws, or chelae, that can be six times longer than the body. They use these large claws to catch prey or to look big to predators. They also have smaller legs used for walking. A tiny fifth pair of legs is tucked under the shell. These small legs are used to clean the body and the gills.

Many squat lobsters like to live in large groups called aggregations. They often gather in areas with lots of food, like shipwrecks or whale falls. Some species, like Munida gregaria, form massive swarms in the water. These swarms can be 200 meters tall and 10 kilometers wide. Other species stay on the sea floor near structures like coral. This behavior helps them find food and stay safe from enemies. Even though they look like lobsters, they are actually closer relatives to the hermit crab.

Squat lobsters are unique crustaceans that live in oceans across the entire world. They belong to the infraorder Anomura, which is a group that includes hermit crabs and mole crabs. These animals are characterized by being dorsoventrally flattened, meaning they are pressed thin from top to bottom. This shape makes them look like a morphological intermediate between a true lobster and a crab. They are found in many different environments, from the ocean surface to deep-sea hydrothermal vents. One remarkable species even lives in caves located above sea level.

The body of a squat lobster is divided into two primary regions. The first is the cephalothorax, which combines the head and the thorax. This section is covered by a thick carapace, a hard shell that protects the body. The carapace can vary greatly in shape and ornamentation. In some species, it forms a rostrum, which is a forward-pointing structure in front of the eyes. Other species have a wide, serrated carapace, while some have long, narrow versions with supraorbital spines. The cephalothorax contains 19 body segments, or somites, though these are difficult to see.

Squat lobsters have a variety of specialized appendages attached to their cephalothorax. They possess two pairs of antennae and six pairs of mouthparts. These mouthparts, including the mandibles and maxillipeds, do more than just move food. They allow the animal to gather prey, move sediment, and sort through particles. The most visible appendages are the pereiopods, or walking legs. The first pair are the chelipeds, which end in large claws called chelae. These claws can sometimes be more than six times the length of the animal's body.

The second main body part is the pleon, also known as the abdomen. The pleon consists of six somites and ends in a structure called a telson. Most squat lobsters keep their pleon curled tightly beneath the cephalothorax. Attached to the pleon are several pairs of appendages called pleopods. These appendages differ between males and females. In females, some pleopods have long bristles called setae to which they attach their eggs. In males, the first two pairs are modified into gonopods, which are used to transfer a spermatophore to the female during mating.

Scientists have identified a massive diversity of these creatures. There are more than 900 described species across about 60 genera. If the family Aeglidae is included, the number rises to over 1,000 species in 61 genera. These animals can be found at altitudes up to 3,600 meters above sea level. A 2020 study discovered that squat lobsters are even more diverse than previously believed. This research described 16 new species within the Leiogalathea genus. The study also noted that the Atlantic Ocean has fewer species than the Pacific Ocean.

Many squat lobster species engage in interesting social behaviors like aggregation. Benthic squat lobsters often gather in high densities around productive areas like hydrothermal vents or shipwrecks. They may use these structures as shelter from predators or as places where food accumulates. Some species, such as Munida gregaria, perform vertical migrations in the water column. They can form massive swarms that are 200 meters tall and 10 kilometers wide. In these swarms, they rely on tidal streams to help them feed. These aggregations can reach densities of 2,700 individuals per cubic meter.

Squat lobsters also use specific body movements to interact with their environment. They may extend their claws into the water column as an active fishing strategy to catch prey. This behavior can also act as an illusory display to make them look larger to predators. While they can be aggressive during competition for food or mates, they are generally unaggressive toward one another. Most aggressive displays are ignored 70% of the time. In some cases, the behavior is met with submission or reciprocal aggression. This helps maintain stability in dense populations where food is a shared resource.