Definition

Noun: * A small, shrimp-like crustacean. The defining characteristic is that the female carries her eggs and newly hatched young in a special pouch, called a marsupium, located between her legs. This protective brood pouch is reminiscent of the pouch of an opossum, which gives the animal its common name.

Usage

• The term "opossum shrimp" is used to refer to these specific crustaceans, primarily within the order Mysida. It is a common name used in marine and freshwater biology.
• Example: "The biologist studied the population of opossum shrimp in the estuary, noting their importance in the food web."
• Example: "Under the microscope, we could see the tiny young developing within the female opossum shrimp's brood pouch."

Advanced Usage

• While "opossum shrimp" commonly refers to mysid crustaceans, the name is sometimes also applied to certain species in the order Lophogastrida, which are closely related.
• In ecological studies, they are often discussed as a key prey species for fish, whales, and seabirds.
• Example: "The diel vertical migration of opossum shrimp is a significant factor in the movement of energy in pelagic ecosystems."

Variants and Related Words

• Mysid (n): The more formal, scientific term for most animals called opossum shrimp, belonging to the order Mysida.
  • Example: "The sample was dominated by various species of mysids."
• Mysid shrimp (n): A synonym often used interchangeably with "opossum shrimp."
• Brood pouch or Marsupium (n): The specialized pouch where the female carries eggs and young.

Synonyms

• Mysid shrimp
• Mysid (scientific context)

Notes on Meaning

• It is important to note that "opossum shrimp" are not true shrimp (which belong to the order Decapoda). They are a different group of crustaceans, distinguished by their brood pouch and other morphological features.
• The name directly draws a comparison to the opossum, a marsupial mammal, due to the shared reproductive strategy of carrying offspring in a pouch.

Noun

1. shrimp-like crustaceans whose females carry eggs and young in a pouch between the legs