. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. REGENERATION IN ECHINODERM LARVAE 125 B. Figure 3. Diagrams of organogenesis in earl\-stage anterior portions of surgicalh bisected regenerating bipinnana lar\ae. (A) through (G) represent a frontal \ ie\\. (a I through (g I represent a lateral \ ie\\. (A i and I a I represent the anterior portion immediate!) after surgical bisection. (Bl and ib) through (D) and (d) represent the formation of a new gul described in Fis:. 2iB> and (C). (hi and (el tlirough (G) and (g) represent the formation of a lieu set of cocloms and di
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. REGENERATION IN ECHINODERM LARVAE 125 B. Figure 3. Diagrams of organogenesis in earl\-stage anterior portions of surgicalh bisected regenerating bipinnana lar\ae. (A) through (G) represent a frontal \ ie\\. (a I through (g I represent a lateral \ ie\\. (A i and I a I represent the anterior portion immediate!) after surgical bisection. (Bl and ib) through (D) and (d) represent the formation of a new gul described in Fis:. 2iB> and (C). (hi and (el tlirough (G) and (g) represent the formation of a lieu set of cocloms and differentiation of the newly formed gut into esophagus, stomach, and intestine described in Fig. 2 (D). a, anus; cb. ciliar\ band: cp. coelomic pouch: g. gut: rep. rudiment of coelomic pouch: ni. reseneratini! "tit. regenerate the missing digestive system, the body wall begins to invaginate (Fig. 3Bb, Cc), eventually forming a new anus (Fig. 3Dd). During this time, the postoral ciliary band extends toward the posterior. Meanwhile, from the anterior portion of the new gut, an entirely new set of coeloms is formed by lateral evagination of the newly formed digestive system (Fig. 3Ee), which then separate from the gut and elongate anteriorly and posteriorly along- side the newly formed digestive system (Fig. 3Ft'). Afterwards, complete differentiation of the newly formed digestive system, completion of regeneration of the lost components of the postoral ciliary band, and further devel- opment of both coeloms are observed (Fig. 3Gg). Our observations of the regeneration process in early-stage bi- pinaria larva of P. ochraceus were virtually identical to those described above for L. foliolata. Regeneration in mid-stage lan'ae. Regenerative pro- cesses in bisected mid-stage larvae of both L. foliolata and P. ochraceus were virtually identical to those described above for early bipinnaria larva of L. foliolata (as previously reported by Vickery and McClintock, 1998). The only dif-
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
