👉 The term "thoracostracan" refers to a specific type of bone found in vertebrates, including fish and birds. It is called this because it is located between the thoracic vertebrae (the backbone) and the sacral vertebrae (the lower back), which are part of the spine. The thoracostracan bones are typically larger than the other vertebral columns (such as the scapula, ribs, or pelvis). They play a crucial
