#caridea

Caridina rubropunctata

also known as the Leopard Shrimp, Vietnam Leopard Shrimp, and Leopard Tiger Shrimp.

Alpheus bellimanus

also known as the Olive Snapping Shrimp.

Decapocember Day 8: There are many crustaceans called "shrimp," but those of the infraorder Caridea are true shrimp (even if some have the word "prawn" in their common names). The most distinctive feature of carideans is that the second abdominal segment overlaps the first and third segments. Many shrimp also have a "caridean bend," so their abdomens aren't straight.

notes: ok

Pistol Shrimp

Pistol shrimp is capable of producing a sound reaching 218 decibels, which is louder than a gunshot and capable of breaking glass jars, hence making it difficult to keep it in aquariums.

Snapping shrimp have the ability to reverse claws. If they lose the snapping claw, the missing limb regenerates into a smaller claw and the original smaller appendage grows into a new snapping claw.

The snapping action of the claw creates a cavitation bubble that reaches speeds up to 62 miles an hour (100 km/hr.) and collapses with a loud snap.

The snap of the bubble also produces something called sonoluminescence, i.e., emission of short bursts of light. When the cavitation bubble collapses it reaches temperatures of over 5000 Kelvin and produces a flash of light which lasts for no longer than 10 nanoseconds and is not visible to the naked eye.