eohippus

Thân thiện

A small eohippus grazes in a prehistoric forest clearing.

Definition

Noun: 1. An extinct, primitive horse: "Eohippus" refers to the earliest known ancestor of the modern horse, a small, dog-sized mammal that lived during the Eocene epoch. It is characterized by having four toes on its front feet and three toes on its hind feet.

Examples

• Noun:
  • Fossils of the eohippus were discovered in North America and Europe.
  • The eohippus is considered a key species for understanding equine evolution.
  • Compared to modern horses, the eohippus was much smaller and had a multi-toed foot structure.

Advanced Usage

• In evolutionary biology: The term "eohippus" is often used as a classic example of evolutionary transition, illustrating the change in size and limb structure over millions of years.
  • The lineage from eohippus to Equus demonstrates clear morphological adaptation.

Variants and Related Words

• Hyracotherium (n): The genus name often used synonymously with "eohippus" in scientific literature.
  • Some paleontologists classify these fossils under the genus Hyracotherium.
• Dawn horse (n): A common name for "eohippus," derived from the Greek roots (dawn) and (horse).

Synonyms

• Dawn horse: The common descriptive name.
• Hyracotherium: The alternative scientific genus name.

Related Phrases / Terms

• Evolutionary precursor: A term describing the role of "eohippus" in relation to later horses.
  • The eohippus is the evolutionary precursor to all modern equines.

Học thuật

Noun

1. earliest horse; extinct primitive dog-sized four-toed Eocene animal

Từ đồng nghĩa

• dawn horse