Ctenophorans, also known as comb jellies, are a group of marine invertebrates that belong to the phylum Ctenophora. They are characterized by their unique comb-like structure made up of cilia, called comb rows, which they use for locomotion through the water. Ctenophorans are gelatinous, transparent organisms that can vary in size from a few millimeters to several centimeters in length.
These creatures possess a simplified body plan, with a biradial symmetry that extends vertically through their bodies. They typically have a spherical or oval-shaped body that contains a central digestive cavity, known as the gastrovascular system. The gastrovascular system consists of canals and branches that help in both digestion and distribution of nutrients throughout their bodies.
Ctenophorans are non-predatory organisms that feed on planktonic species, small fish, and other marine organisms. Some species have long, sticky tentacles used to capture their prey, while others rely on their comb rows to generate water currents that bring food particles towards their mouths.
These marine creatures exhibit striking bioluminescent capabilities, with some species emitting light that varies in color and pattern. This bioluminescence serves various functions, including attracting prey, confusing predators, and communication within their species.
Ctenophorans are found in marine environments worldwide, inhabiting both shallow and deep waters. They play a vital role in the marine ecosystem, as they are an essential component of the planktonic community and food web. Despite their delicate appearance, some ctenophoran species have invasive traits and can have significant impacts on local ecosystems.
