. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 264 K. YAMASHITA ET AL. Figure 6. Rubbing of the aboral tentacle tip with sinuous movement, followed by discharge and sticking of atrichous isorhiza nematocytes (arrowheads) on the glass surface during the settlement of an aetinula larva. The elapsed time from A to D was about 5 min. A-D are same magnification. Bar = 50 ;um. ). which were not deployed in the tentacle tips. In the tentacles of 2-4-h-old larvae four types of nematocytes, namely atrichous isorhiza (AI). stenotele (S), desmoneme (D). and microbasic mastigopho
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 264 K. YAMASHITA ET AL. Figure 6. Rubbing of the aboral tentacle tip with sinuous movement, followed by discharge and sticking of atrichous isorhiza nematocytes (arrowheads) on the glass surface during the settlement of an aetinula larva. The elapsed time from A to D was about 5 min. A-D are same magnification. Bar = 50 ;um. ). which were not deployed in the tentacle tips. In the tentacles of 2-4-h-old larvae four types of nematocytes, namely atrichous isorhiza (AI). stenotele (S), desmoneme (D). and microbasic mastigophore (MM), were observed. About 170 AIs were deployed at a tentacle tip at this stage, while small numbers of S, D, and MM were observed along an aboral tentacle (AI, ± ; S, ± ; D, ± ; MM. ± ; the total, ± ). In contrast, no AIs but numerous small Ss were present in the body walls of these larvae (Fig. 5). In 24-28-h-old larvae, the number of AIs in the tentacles gradually decreased, while other types of nematocytes (S, D, and MM) increased in number (AI, ± ; S. ± ; D, ± ; MM. ± : the total, ± ). During pre-settlement and post-settlement stages, S and D nemato- cytes actively migrated in the ectoderm from the body wall to the tentacle tips at an speed of /nm/rnin ( ± ) (Fig. 9), which led to dynamic change in the tentacular nematocyte composition. Newly settled individuals that did not develop to hydrocaulus and hydrorhiza elongation re- tained small numbers of AIs in the aboral tentacle tips (AI, ± ; S. ± ; D, ± ; MM, ± ; the total, ± ). In polyps of 2 days after settlement, in which all aboral tentacles extended up- ward completely and the hydrocaulus was so long that the aboral tentacles could not touch the substrata, AI nemato- cytes disappeared and the aboral tentacles contained many nematocytes of three ty
Size: 1911px × 1307px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
