Abstract：
The fine structure of echiurid blood vessels in the proboscis is known in detail, but the circulatory system of the trunk is still understood mainly at the level of general anatomy. The trunk circulatory system was studied in Bonellia viridis females, and specialized podocytes were found to form the walls of the ring vessel and the anterior part of the ventral vessel. Podocytes were for the first time described in the echiurid circulatory system. Podocytes of B. viridis displayed a typical cell architecture, which is known for other bilaterians. A podocyte consists of a cell body; primary processes; and pedicels, which extend from the primary processes and are interconnected via specialized slit diaphragms. The presence of podocytes indicates that the ventral and ring vessels act as ultrafiltration sites, where the plasma is filtered through the basal lamina into the body cavity.
摘要：
详细了解了长鼻中的斑状血管的精细结构，但是躯干的循环系统仍然主要在一般解剖学水平上被理解。研究了蛇床子雌性的躯干循环系统，发现专门的足细胞形成环形血管的壁和腹侧血管的前部。足细胞首次在echiurid循环系统中被描述。B.viridis的足细胞表现出典型的细胞结构，这是众所周知的其他双边。足细胞由细胞体组成；初级过程；和花梗，从主要过程延伸，并通过专门的狭缝隔膜相互连接。足细胞的存在表明腹侧和环形血管充当超滤位点，血浆通过基底层过滤进入体腔。
