The Problem:
* "Irregular" is subjective: What one person considers irregular, another might not. A starfish is very symmetrical to some, while another might see it as irregular.
* Animal shapes are diverse: There's a vast range of shapes in the animal kingdom, from the streamlined bodies of fish to the spiky shells of sea urchins.
Possible Terms:
Instead of a single term, you could use descriptive terms based on the specific shape or feature:
* Amorphous: This describes animals with a shapeless or undefined form.
* Asymmetrical: Used for animals that lack bilateral symmetry (mirror image halves).
* Spiky: For animals with pointed projections or spines.
* Lobed: For animals with rounded, irregular protrusions.
* Irregularly Shaped: A general term that can be used, but it's less specific.
Examples:
* Amorphous: Some amoebas and jellyfish
* Asymmetrical: Flatfish, crabs, some sea anemones
* Spiky: Hedgehogs, porcupines, sea urchins
* Lobed: Some starfish, sea slugs
Ultimately, the best way to describe an animal's shape is to use specific and descriptive language that accurately reflects its form.