Cyclichthys is a genus of marine fish in the porcupinefish family, Diodontidae. Species within this genus are commonly known as swelltoads or burrfishes. The genus name is derived from the Greek words kyklos (circle or round) and ichthys (fish), referring to their compact, globular body shape.
Distinguishing Features
Fish of the genus Cyclichthys possess three-rooted, rigid spines (modified scales) distributed over their bodies, along with beak-like jaws used to crush hard-shelled prey such as crustaceans and molluscs. They are distinguished from members of the related genus Diodon, which have movable spines, by the fact that their spines are fixed and immovable.
Defensive Mechanisms
Like other members of the order Tetraodontiformes (which includes blowfish and pufferfish), Cyclichthys species have the ability to inflate their bodies with water or air as a defense against predators. Their inflated size, combined with their rigid spines, makes them extremely difficult to swallow. Some species may be toxic through the accumulation of tetrodotoxin or ciguatera.
Species
There are currently three recognized species in the genus:
| Scientific Name | Common Name | Distribution |
|---|---|---|
| Cyclichthys hardenbergi (de Beaufort, 1939) | Hardenburg's burrfish | Western Pacific: southern New Guinea and tropical Australia east of Cape York |
| Cyclichthys orbicularis (Bloch, 1785) | Birdbeak burrfish | Indo-West Pacific region from the Red Sea to the Philippines |
| Cyclichthys spilostylus (Leis & J. E. Randall, 1982) | Spotbase burrfish (or yellowspotted burrfish) | Red Sea to South Africa, east to southern Japan, the Philippines, Australia, and New Caledonia |
Taxonomy
The genus was first described by Johann Jakob Kaup in 1855. It belongs to the family Diodontidae within the order Tetraodontiformes.
