A longitudinal groove in the pharynx of chordates that secretes mucus to trap food particles; it is considered homologous to the thyroid gland in vertebrates and plays a crucial role in filter-feeding and metabolism.
A longitudinal groove in the pharynx of chordates that secretes mucus to trap food particles; it is considered homologous to the thyroid gland in vertebrates and plays a crucial role in filter-feeding and metabolism.