Ecteinascidia nexa is a species of colonial tunicate found in various marine habitats. These organisms are known for their distinctive appearance and ecological significance. They play a crucial role in the marine ecosystem, contributing to the overall health and diversity of the ocean.
Description & Characteristics
Ecteinascidia nexa colonies can grow up to 10 cm in diameter and are typically composed of numerous individual zooids. These zooids are small, sac-like organisms that are connected by a common tunic, a tough, leathery outer layer. The colonies often exhibit a vibrant orange or reddish-brown coloration, which adds to their visual appeal.
Habitat and Occurrence
Ecteinascidia nexa is commonly found in intertidal zones, where they are exposed to fluctuating tidal conditions. This species can also be found in subtidal regions, extending down to depths of approximately 30 meters. Their preferred habitats include rocky shores, seagrass beds, and coral reefs, where they attach themselves to various surfaces. The distribution of Ecteinascidia nexa extends across the western Atlantic Ocean, from Florida to Brazil, encompassing a wide range of marine zones.
Taxonomy
Ecteinascidia nexa belongs to the Class: Ascidiacea, an extensive group of marine invertebrates. They are classified under the Order: Phlebobranchia, which encompasses a variety of tunicates that filter feed through a single siphon. This species falls within the Family: Perophoridae, a family characterized by colonial tunicates with a distinctive morphology.
Feeding
Ecteinascidia nexa are filter feeders, relying on microscopic organisms suspended in the water column for sustenance. They draw water into their bodies through an incurrent siphon and filter out food particles using specialized structures known as gill slits. The filtered water is then expelled through an excurrent siphon, completing the feeding process.
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