How does the pedicle develop differently in articulate and inarticulate lamp shell larvae?

In lamp shells (brachiopods), the development of the pedicle—a stalklike organ used for attachment—differs significantly between the two major groups during the larval stage:

• Inarticulate lamp shells: The pedicle develops from a mantle fold located along the valve margin.1
• Articulate lamp shells: The pedicle develops from the caudal, or hind, region of the larva.1

These developmental differences reflect the distinct biological structures of the two groups, where articulate brachiopods possess valves joined by teeth and sockets, while inarticulate brachiopods rely on muscles to hold their valves together.12