Definition

1. Noun:
   • A free-swimming oceanic tunicate with a barrel-shaped, transparent body. It is a small, gelatinous marine animal belonging to the class Thaliacea.

Usage

• The word "doliolum" is a specific scientific term used primarily in marine biology and zoology. It refers to a particular genus of pelagic tunicates. It is used as a countable noun.

Examples

• Noun:
  • Under the microscope, the researcher observed the ciliary bands of the doliolum.
  • The doliolum is an important part of the oceanic plankton community.
  • Their study focused on the life cycle of Doliolum nationalis.

Advanced Usage

• The term is often used in technical descriptions of marine ecosystems, plankton surveys, and biological research papers.
• It can be part of compound names specifying species within the genus, e.g., .

Variants and Related Words

• Doliolid (n): A member of the order Doliolida, to which doliolums belong. This is a more general term for animals in this group.
• Thaliacean (n): Belonging to the class Thaliacea, which includes doliolums, salps, and pyrosomes.

Synonyms

• Barrel tunicate: A descriptive common name referencing its shape and biological class.
• Pelagic tunicate: A broader term indicating its free-swimming, open-ocean habitat and type.

Notes on Meaning

• The reference to "họ thân mềm có vỏ sò" (family of mollusks with seashells) from the English-Vietnamese dictionary is incorrect for the standard biological definition of "doliolum." A doliolum is a tunicate (urochordate), not a mollusk, and does not have a seashell. The correct definition is provided above.

Noun

1. free-swimming oceanic tunicate with a barrel-shaped transparent body