Donax obesulus, commonly known as the Fat Donax, is a small, distinctive species of saltwater clam belonging to the family Donacidae. These clams are widespread in the intertidal zone of various coastal regions.
Description & Characteristics
Donax obesulus is a small clam with a distinct, somewhat rounded shell. The shell’s length typically reaches a maximum of 25 millimeters, and its characteristic shape and size have earned it the common name “Fat Donax.” The shell color can vary, ranging from pale white to a light yellowish-brown, often displaying subtle patterns and striations.
Habitat and Occurrence
Donax obesulus exhibits a preference for sandy substrates in the intertidal zone. This species is commonly found in the lower intertidal and subtidal regions, extending to a depth of approximately 10 meters. They are particularly prevalent in locations with wave action and moderate to high levels of sediment movement. Donax obesulus is a notable inhabitant of the neritic zone, a region characterized by its proximity to the coastline.
Taxonomy
Donax obesulus belongs to the Class Bivalvia, the order Cardiida, and the family Donacidae. These taxonomic classifications place this species among a diverse group of marine bivalves that share certain common features, such as their two-valved shells and filter-feeding mechanisms.
Feeding
Donax obesulus is a suspension feeder. They obtain nourishment by filtering microscopic organisms and organic matter from the water column. This feeding strategy is common amongst bivalves, allowing them to thrive in diverse marine environments.
Image References