Amphithrax
Amphithrax is a genus of marine worms belonging to the family Ampharetidae, which are polychaete worms commonly known as “tubeworms.” The genus currently contains four described species: Amphithrax edwardsi, Amphithrax maculatus, Amphithrax mucronatus, and Amphithrax racovitzai. These worms are typically small, ranging in size from a few millimeters to a few centimeters in length, and are characterized by their unique morphology and habitat preferences.
Characteristics
Amphithrax species possess a number of distinctive characteristics that set them apart from other polychaete worms. They are known for their elongated, segmented bodies, which are covered in bristles called setae. These bristles play a vital role in locomotion and anchoring the worm within its tube. The anterior end of the worm bears a distinct prostomium, a small head-like structure, which may be equipped with sensory appendages. The prostomium houses the mouth, which is typically located on the ventral side of the body. Amphithrax worms have a well-developed digestive system, consisting of a pharynx, esophagus, stomach, and intestine.
Environments
Amphithrax species are primarily found in marine environments, typically inhabiting soft sediments like mud or sand. They are commonly encountered in intertidal zones, estuaries, and shallow coastal waters. These worms are known to be benthic organisms, meaning they live at the bottom of the ocean floor. Their preferred habitat often includes areas with high organic content, such as near seaweed beds or decaying organic matter.