Cell number and cellular composition in infusoriform larvae of dicyemid mesozoans (Phylum dicyemida)
Cell number and cellular composition in infusoriform larvae of dicyemid mesozoans (Phylum dicyemida)
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DOI：
10.2108/zsj.21.877
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发表时间：
2004-08-01
影响因子：
0.9
通讯作者：
Tsuneki, K
中科院分区：
文献类型：
--
作者：
Furuya, H;Hochberg, FG;Tsuneki, K
对6属44种双叶纲中虫的虫形幼虫进行了细胞数量和细胞组成的测定；Conocyema, Dicyema, dicyemoennea, Dicyemodeca， Microcyema和pseudocyema。此外，对另外20种虫形幼虫的研究进行了综述。虫形幼虫由固定的细胞数目组成，这是种特异性的。总细胞数35、37、39、41和42的种间差异较小。所研究的虫蛹中最常见的细胞数是37或39。虫形幼虫分3属，有35个细胞。虫形幼虫有4属37个细胞。虫形幼虫分4属，有39个细胞。细胞总数的大多数差异是由于缺少或存在特定的腹侧细胞。在所有的虫形幼虫中，侧卧、背卧和尾卧区域的细胞是固定的，而在顶端和腹卧区域，细胞的结构是不同的和可变的。在细胞组成上，所有虫形幼虫共鉴定出29个细胞（15种细胞类型）。额外的细胞类型是相对少数物种的特征。即使在细胞总数相同的虫形幼虫中，细胞组成也因物种而异。因此，37个细胞的虫形幼虫的细胞组成有7种变化。幼虫细胞数量和类型的差异不能保证传统的双叶属分离。
Cell numbers and cellular composition were examined in infusoriform larvae of 44 species of dicyemid mesozoans belonging to 6 genera; Conocyema, Dicyema, Dicyemennea, Dicyemodeca, Microcyema, and Pseudicyema. In addition, literature on infusoriform larvae of another 20 species was reviewed. Infusoriform larvae consist of a constant cell number which is species-specific. Small interspecific variations are found in total cell numbers, 35, 37, 39, 41 and 42. The most frequent cell number encountered in infusoriform larvae studied is either 37 or 39. Infusoriform larvae with 35 cells are found in three genera. Infusoriform larvae with 37 cells are found in four genera. Infusoriform larvae with 39 cells are found in four genera. Most differences in total cell numbers are due to the absence or presence of particular ventral cells. In all infusoriform larvae, the lateral, dorsal and caudal areas are cell constant, whereas in the apical and ventral areas a distinct and variable configuration of cells are present. In cellular composition, a total of 29 cells (15 cell types) were recognized in all infusoriform larvae examined. Additional cell types are characteristic of a relatively few species. Even in infusoriform larvae with the same total cell numbers, cellular composition varies by species. Thus, there are 7 variations of cellular composition in infusoriform larvae with 37 cells. Differences in larval cell numbers and types do not warrant traditional generic separation of dicyemids.