Tunicates (also known as Urochordata) are a group of marine invertebrate animals, characterized by a unique 'tunic' or outer covering composed of a cellulose-like material called tunicin. These sac-like or barrel-shaped creatures filter feed, drawing water into their body through an inhalant siphon and expelling it through an exhalant siphon. They exhibit features of chordates during their larval stage, including a notochord, but lose these features as adults, existing in diverse forms, solitary or colonial, and playing a crucial role in marine ecosystems. Their diversity spans various habitats and depths. They are important for understanding the evolution of chordates.
Tunicates meaning with examples
- Scientists are studying the genetic makeup of tunicates to better understand the evolution of vertebrates, as they share some key developmental genes. Their simple body plans provide insight into fundamental biological processes.
- Divers often encounter various species of tunicates clinging to rocks, docks, and the hulls of ships. Their brightly colored tunics can add vibrancy to the underwater landscape, showcasing their unique adaptation.
- Tunicate populations can sometimes experience blooms, where their numbers rapidly increase. This can lead to ecological impacts, affecting the availability of resources for other marine organisms and modifying habitats.
- The study of tunicate larvae reveals the presence of a notochord, a structure that is considered a defining characteristic of chordates, providing a critical link in evolutionary understanding.