. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure I. General aspect of regenerating Cuvierian tubules in Halo- thuria forskali 3 weeks after a massive tubule expulsion, showing tubules at different stages of regeneration (bar = cm). C. cloaca; FT. fully developed tubule; I, intestine; RT. left respiratory tree; S1-S4. stages 1-4. a thickening of the wall of the basal part of the left respi- ratory tree, at the place where the expelled tubules were attached (SI; Figs. 1 and 2). Stage 2 corresponds to the formation. 8 to 10 days after autotomy, of a translucent sph
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure I. General aspect of regenerating Cuvierian tubules in Halo- thuria forskali 3 weeks after a massive tubule expulsion, showing tubules at different stages of regeneration (bar = cm). C. cloaca; FT. fully developed tubule; I, intestine; RT. left respiratory tree; S1-S4. stages 1-4. a thickening of the wall of the basal part of the left respi- ratory tree, at the place where the expelled tubules were attached (SI; Figs. 1 and 2). Stage 2 corresponds to the formation. 8 to 10 days after autotomy, of a translucent spherical structure measuring from to mm in diameter (S2: Figs. 1 and 2). Stage 3 corresponds to the development. 10 to 14 days after autotomy, of a translucent club-shaped structure rang- ing from 1 to 3 mm in length for a maximum diameter of mm (S3; Figs. 1 and 2). Stage 4 corresponds to the transformation of the regen- erating structure, 14 to 21 days after autotomy, into a small pale-pink tubule measuring from 4 to 12 mm in length (S4; Figs. 1 and 2). From this stage on, the shape of the regen- erating tubule remains constant, only the length and diam- eter of the tubule increase. Stage 5 corresponds to the differentiation, 21 to 28 days after autotomy, of a functional tubule that possesses a short basal peduncle and measures from 14 to 22 mm long for a diameter of about mm (S5: Fig. 2). Although they are only half the size of a fully developed tubule, regenerating tubules at stage 5 are able to lengthen and become sticky. They reach their full size 28 to 35 days after autotomy. Ultrastnicture of regenerating tubules Immediately after their expulsion and lengthening, Cu- vierian tubules are autotomized at the narrow peduncle that attaches them to the left respiratory tree. The resulting wound is relatively limited and is rapidly closed by migra- tion of mesothelial cells on the coelom side and epithelial cells on the side of the respiratory tree lumen. At the
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
