Rimskaya-Korsakova Nadezhda N, Galkin Sergey V, Malakhov Vladimir V
Department of Invertebrate Zoology, Lomonosov Moscow State University, 1-12, Leninskie Gory, Moscow, 119234, Russia.
Laboratory of Bottom Ocean Fauna, Shirshov Institute of Oceanology (RAS), 36, Nakhimovski prospect, Moscow, 117997, Russia.
J Morphol. 2017 Jun;278(6):810-827. doi: 10.1002/jmor.20677. Epub 2017 Mar 27.
The giant dimensions of vestimentiferan Riftia pachyptila (Jones, ) are achieved thanks to the well-developed vascular system. In the vestimentum, there is a complicated net of lacunae, including the brain blood supply and the ventral lacuna underlying the ciliary field. The trunk region has an extensive network of blood vessels feeding the gonads («rete mirabile»). The thick muscular lining of the mesenterial vessels in the trunk and the dorsal vessel in the opisthosome serves as an additional pump, pushing blood into numerous vessels in the segments. It was hypothesized that the blood envelope of the ventral blood vessel in the trunk provides the blood supply to the trophosome. The 3D reconstruction has revealed that there are two vascular systems of the tentacular crown of R. pachyptila. Blood runs into the tentacles via axial afferent vessels, as described earlier only for Riftia, and also via basal ones, as described for other vestimentiferans except Riftia. The basal ones are poorly developed, and the number of lamellar blood vessels is small, indicating a lack of demand for these within huge R. pachyptila. It appears that the presence of these vessels is the preserved ancestral state of Vestimentifera. In different portions of the dorsal vessel, the morphology of the intravasal body varies, depending on function.
巨型管栖蠕虫厚巨穴蛤（琼斯， ）之所以体型巨大，得益于其发育完善的血管系统。在体被中，存在一个复杂的腔隙网络，包括脑部血液供应和纤毛区域下方的腹侧腔隙。躯干区域有一个广泛的血管网络为性腺供血（“神奇网”）。躯干中肠系膜血管和后体部背血管的厚肌肉内衬起到额外泵的作用，将血液推入各节段的众多血管中。据推测，躯干腹侧血管的血膜为营养体提供血液供应。三维重建显示，厚巨穴蛤触手冠有两个血管系统。血液通过轴向传入血管流入触手，如之前仅针对厚巨穴蛤所描述的那样，也通过基部血管流入，这是除厚巨穴蛤外其他管栖蠕虫的情况。基部血管发育不良，板层血管数量少，这表明在巨大的厚巨穴蛤体内对这些血管的需求不足。这些血管的存在似乎是管栖蠕虫保留下来的原始状态。在背血管的不同部分，血管内体的形态因功能而异。
