Rhode Birgit
Institut für Zoologie der Freien Universität Berlin, 1000 Berlin 33, Federal Republic of Germany.
J Morphol. 1990 Aug;205(2):147-154. doi: 10.1002/jmor.1052050203.
The protandric hermaphrodite Ophryotrocha puerilis possesses one pair of eyes. They are located in the peristomium. Each light-sensitive organ consists of one sensory cell and one to two supporting cell(s) embedded in a cup-shaped reflector. The sensory-supporting cell complex is enveloped by a basal lamina. This lamina is supposed to be identical with the neural lamella. Thus the eyes proper have to be regarded as protrusions from the brain, while epidermal cells seem to differentiate to crystalline cells (reflector) and are deposited onto the sensory complex. The reflector is built up by several cup-shaped cells (juveniles, 4-5; adults, 10-12). Each of these cells comprises a multilayer of parallel-oriented, membrane-bound crystalline platelets which are thought to be guanine. The sensory cell is of the inverted rhabdomere type. Submicrovillar cisternae, typical for most polychaete eyes, are lacking. The first and always present supporting cell entirely envelops the sensory cell, thus forming the extracellular space around the rhabdomere. It does not contain any pigment granules. Often but not always a second supporting cell has been observed surrounding the sensory cell and first supporting cell. It is interpreted as a glial cell. In the sensory cell beneath the rhabdomere, pino- and phagocytosis can be observed and secondary lysosomes are found in high densities. Preliminary results seem to demonstrate that there is no distinct diurnal cycle of receptoral membrane recycling. In comparison with the ocelli of Dinophilidae, which have been interpreted as a dorvilleid-related family, morphological differences and their application to phylogenetic considerations are discussed.
雄性先熟雌雄同体的小眼双眼虫有一对眼睛。它们位于口前叶。每个感光器官由一个感觉细胞和一到两个支持细胞组成，这些细胞嵌入杯状反光器中。感觉 - 支持细胞复合体被基膜包裹。该基膜被认为与神经板相同。因此，真正的眼睛必须被视为大脑的突出物，而表皮细胞似乎分化为晶体细胞（反光器）并沉积在感觉复合体上。反光器由几个杯状细胞组成（幼体有4 - 5个；成体有10 - 12个）。这些细胞中的每一个都包含多层平行排列的、膜结合的晶体血小板，这些血小板被认为是鸟嘌呤。感觉细胞是倒生视杆型。大多数多毛类动物眼睛典型的亚微绒毛池并不存在。第一个且始终存在的支持细胞完全包裹着感觉细胞，从而在视杆周围形成细胞外空间。它不包含任何色素颗粒。经常但并非总是观察到第二个支持细胞围绕着感觉细胞和第一个支持细胞。它被解释为神经胶质细胞。在视杆下方的感觉细胞中，可以观察到胞饮作用和吞噬作用，并且发现高密度的次级溶酶体。初步结果似乎表明，受体膜循环没有明显的昼夜周期。与被解释为与多须虫科相关的嗜泥虫科的单眼相比，讨论了形态差异及其在系统发育考虑中的应用。
