Larval morphology of the brooding clam Lasaea adansonii (Gmelin, 1791) (Bivalvia, Heterodonta, Galeommatoidea)
Larval morphology of the brooding clam Lasaea adansonii (Gmelin, 1791) (Bivalvia, Heterodonta, Galeommatoidea)
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DOI：
10.1002/jmor.10623
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发表时间：
2008-06-01
影响因子：
1.5
通讯作者：
Haszprunar, Gerhard
中科院分区：
文献类型：
--
作者：
Altnoeder, Andreas;Haszprunar, Gerhard
小而育雏的盔状幼体双壳类Lasaea adansonii（Gmelin，1791）[syn.已通过透射和扫描电子显微镜以及通过肌肉系统和两种神经示踪剂FMRFamide和5-羟色胺的荧光染色研究了Lasaea rubra（Montagu，1803）]。此外，两个发展阶段可视化使用计算机辅助三维重建。L. adansonii没有纤毛环。顶端器官出现内陷：导管的基部接触大脑神经节，并在口前区域开口。缺乏幼虫原肾管。成人肾脏的发育独立于心包腔，并包含原肾管部分，其能够实现排泄功能，直到心包形成。幼虫的肌肉系统由平滑肌纤维组成，缺乏横纹肌纤维。在韧带的后面和正下方，存在一对功能未知的细胞，含有5-羟色胺和FMRFamide。综上所述，L. adansonii为直接发育。只有少数真正的幼虫结构（例如，修饰的顶端器官）进行了详细阐述。
The strongly modified mode of development of the small and brooding galeommatoid bivalve Lasaea adansonii (Gmelin, 1791) [syn. Lasaea rubra (Montagu, 1803)] has been studied by means of transmission and scanning electron microscopy and by fluorescent staining of the muscular system and of two neurotracers, FMRFamide and serotonin. In addition, two developmental stages were visualized using computer-aided 3D-reconstruction. All larval stages of L. adansonii lack ciliary rings. The apical organ appears invaginated: the base of the duct contacts the cerebral ganglia and opens on the preoral region. Larval protonephridia are lacking. The adult kidneys develop independently of the pericardial cavity and contain a protonephridial part that enables excretory function until the pericardium is formed. The larval muscular system is composed of smooth muscle fibers; striated fibers are lacking. Posteriorly and immediately below the ligament, a paired cell of unknown function is present that contains serotonin and FMRFamide. In summary, L. adansonii exhibits the direct mode of development. Only few truly larval structures (e.g., the modified apical organ) are elaborated.