opossum shrimp

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opossum shrimp

A small opossum shrimp swims in a clear freshwater stream.

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.
opossum shrimp

A small opossum shrimp swims in a clear freshwater stream.

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