An ascidian larva is the larval stage of ascidians, which are protochordates related to vertebrate ancestors. This larval stage is significant because it exhibits the basic chordate body plan.
Key Features of Ascidian Larva
The ascidian larva possesses several key characteristics that highlight its importance in understanding chordate evolution. These features include:
- Notochord: A flexible rod that supports the body.
- Dorsal Nerve Cord: A tubular bundle of nerve fibers that runs along the back of the larva.
- Sarcomeric Muscle Cells: Muscle cells arranged in rows, flanking the tail.
Significance
The ascidian larva provides insights into the evolutionary link between protochordates and vertebrates. Specifically, the tail structure of the larva, containing the notochord, dorsal nerve cord, and muscle cells, demonstrates a simplified version of the chordate body plan found in more complex organisms.
