Cell Number and Cellular Composition in Infusoriform Larvae of Dicyemid Mesozoans(Phylum Dicyemida)(Animal Diversity and Evolution)

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概要

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• Cell numbers and cellular composition were examined in infusoriform larvae of 44 species of dicyemid mesozoans belonging to 6 genera; Conocyema, Dicyema, Dicyemennea, Dicyemodeca, Micro-cyema, 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.

• 社団法人日本動物学会の論文
• 2004-08-25

著者

• Hochberg F.

  Department Of Invertebrate Zoology Santa Barbara Museum Of Natural History

• Hochberg F.

  Dept. Of Invert. Zool. Santa Barbara Mus. Nat. Hist.

• Furuya Hidetaka

  Department of Biology, Graduate School of Science, Osaka University

• Tsuneki Kazuhiko

  Department of Biology, Graduate School of Science, Osaka University

• Furuya H

  Department Of Biology Graduate School Of Science Osaka University

• Furuya Hidetaka

  Department Of Biology Graduate School Of Science Osaka University

• Tsuneki K

  Department Of Biology Graduate School Of Science Osaka University

• Tsuneki Kazuhiko

  Department Of Biology Graduate School Of Science Osaka University

• Tsuneki Kazuhiko

  Deapartment Of Biology Graduate School Of Science Osaka University

• Tsuneki Kazuhiko

  Misaki Marine Biological Station Faculty Of Science University Of Tokyo:(present Address)department

• Tsuneki Kazuhiko

  Department Of Biology Osaka University

• Furuya Hidetaka

  Department Of Anatomy Tokyo Dental College

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