A Review of the “Open” and “Closed” Circulatory Systems: New Terminology for Complex Invertebrate Circulatory Systems in Light of Current Findings
Figure 3
The fine
structure of the annelid (Polycheata) circulatory system.
The center diagram shows the general anatomy
of the segmentally based vascular system.
A cross-section through the body wall of the polycheates is shown on the
left with body wall, epidermal, and coelomic vessels identified. The highly
branched parapodial vasculature is outlined on the right (adapted from [11, 12].
