pelvic fin

Thân thiện

A fish uses its pelvic fins to steer around a coral reef.

Definition

1. Noun:
   • A paired fin located on the ventral (lower) side of a fish's body, attached to the pelvic girdle: It is one of the fins that helps stabilize the fish and assists in controlling direction and movement, particularly in steering and braking. In evolutionary terms, it is considered to correspond to the hind limbs of a land vertebrate.

Usage Examples

• Noun:
  • The fish used its pelvic fin to make a sharp turn.
  • In the anatomy lab, we identified the pelvic fin and compared its structure to a tetrapod's femur.
  • Damage to the pelvic fin can impair a fish's ability to maintain its position in the water column.

Advanced Usage

• "Paired pelvic fins": Refers to the set of two fins, one on each side of the fish's ventral surface.
  • The specimen clearly shows the paired pelvic fins located just behind the pectoral fins.

Variants and Related Words

• Ventral fin: A synonym often used interchangeably with pelvic fin, emphasizing its location on the lower side of the body.
• Pelvic girdle (n): The skeletal structure to which the pelvic fins are attached.
• Pectoral fin (n): The paired fins located on the sides of a fish, typically behind the gills, which correspond to the forelimbs of land vertebrates.

Synonyms

• Ventral fin: A fin on the lower surface of a fish.

Related Phrases

• Pelvic fin ray: One of the bony or cartilaginous supports within the pelvic fin.
  • We counted the number of pelvic fin rays for species identification.

Học thuật

Noun

1. either of a pair of fins attached to the pelvic girdle in fishes that help control the direction of movement; correspond to hind limbs of a land vertebrate

Từ đồng nghĩa

• ventral fin