Malacoctenus
Malacoctenus is a genus of marine fish in the family Tripterygiidae, commonly known as triplefins. This genus contains 19 recognized species, all of which are found in the tropical and subtropical waters of the western Atlantic Ocean. These fish are generally small, with most species reaching a maximum length of less than 10 centimeters. They are characterized by their elongated, slender bodies, which are covered in scales.
Common Names
Members of the genus Malacoctenus are commonly referred to as "triplefins" due to their three distinct dorsal fins. They are also sometimes called "blenniid blennies" because they resemble blennies in appearance and behavior. However, they are not actually members of the Blenniidae family.
Characteristics
Malacoctenus species share several distinctive characteristics:
- Elongated, slender body: This allows them to maneuver through tight spaces and crevices.
- Three dorsal fins: This is a defining feature of the Tripterygiidae family. The first two dorsal fins are typically small and separated, while the third dorsal fin is longer and continuous with the caudal fin.
- Small mouth: Their small mouths suggest they feed on smaller invertebrates.
- Scaly body: Scales cover their bodies, but the scales can be very small in some species.
- Bright coloration: Many Malacoctenus species exhibit vibrant colors, often with spots, stripes, or intricate patterns.
- Lateral line: A lateral line is present, though it can be difficult to see in some species.
Environment
Malacoctenus species are found in a variety of marine environments, including:
- Rocky reefs: They often reside among crevices and under ledges, using these shelters for protection and ambush hunting.
- Seagrass beds: Some species prefer the shelter and food sources offered by seagrass habitats.
- Coral reefs: Some species are found on coral reefs, particularly in areas with abundant algae growth.