Exyrias
Exyrias is a genus of gobies, small fish in the family Gobiidae. They are found in the Indo-Pacific region and are notable for their distinctive coloration and behavior.
Common Names
Species within the genus Exyrias are commonly known as "shrimp gobies" or "prawn gobies" due to their close association with shrimp.
Characteristics
Exyrias gobies are characterized by their small size, typically reaching lengths of 2-4 cm. They have elongated bodies with flattened heads and large eyes. Their coloration varies depending on the species, but many exhibit bright colors and patterns, often with striking stripes or spots.
Environments
These gobies are primarily found in coral reefs, seagrass beds, and mangrove swamps. They are often found in association with shrimp, inhabiting burrows or cavities that they share with their host.
Symbiosis with Shrimp
The relationship between Exyrias gobies and shrimp is a classic example of mutualism. The goby provides a valuable service to the shrimp by acting as a vigilant watchman. While the shrimp is busy foraging or building its burrow, the goby stands guard, alerting the shrimp to any approaching danger. The shrimp, in turn, provides shelter and food for the goby.
Species
The genus Exyrias currently includes several recognized species, including:
- Exyrias belcheri
- Exyrias breviceps
- Exyrias erythrorhinus
- Exyrias puntang
- Exyrias scythrops