Caridea

Caridea is an infraorder of shrimp within the order Decapoda. They are commonly referred to as caridean shrimp or true shrimp. Caridea is a diverse group, with over 3,500 species described, and they are found in a variety of aquatic environments, including both marine and freshwater habitats.

Taxonomy and Classification

Caridea belongs to the order Decapoda, which also includes crabs, lobsters, and other shrimp-like crustaceans. The infraorder is further divided into several families, including:

• Alpheidae (snapping shrimp)
• Palaemonidae (palaemonid shrimp)
• Hippolytidae (cleaner shrimp)
• Crangonidae (crangonid shrimp)

Morphology

Caridean shrimp are characterized by their elongated bodies, which are divided into a cephalothorax and an abdomen. They possess a well-developed carapace that covers the cephalothorax, and their bodies are typically laterally compressed. Carideans have ten legs, with the first two pairs often modified into chelae (claws).

Habitat and Distribution

Caridean shrimp are found in a wide range of habitats, from shallow coastal waters to the deep sea. They inhabit various environments, including coral reefs, mangroves, and freshwater rivers and lakes. Some species are also known to live in symbiotic relationships with other marine organisms, such as anemones and sponges.

Behavior and Ecology

Caridean shrimp play a crucial role in aquatic ecosystems. They are both predators and scavengers, feeding on a variety of organic matter, including plankton, detritus, and small invertebrates. Many species are also important prey for larger marine animals, such as fish and cephalopods.

Reproduction

Caridean shrimp exhibit a range of reproductive strategies. Most species are gonochoric, meaning individuals are either male or female. Fertilization is typically internal, and females carry the fertilized eggs on their pleopods (swimming legs) until they hatch into larvae. The larvae undergo several developmental stages before maturing into adults.

Economic Importance

Caridean shrimp are of significant economic importance, particularly in the aquaculture and fishing industries. Species such as the Pacific white shrimp (Litopenaeus vannamei) and the giant tiger prawn (Penaeus monodon) are extensively farmed for human consumption. Additionally, some caridean shrimp, like the cleaner shrimp, are popular in the aquarium trade.

Conservation

While many caridean shrimp species are abundant, some are threatened by overfishing, habitat destruction, and environmental changes. Conservation efforts are essential to ensure the sustainability of shrimp populations and the health of aquatic ecosystems.

See Also

• Decapoda
• Crustacean
• Aquaculture
• Marine biology