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. 2010 Dec 2;7:30. doi: 10.1186/1742-9994-7-30

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Copyright ©2010 Maslakova; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (<url>http://creativecommons.org/licenses/by/2.0</url>), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Development of Micrura alaskensis from blastosquare to young pilidium. DIC images. Left panels - side view, right panels - polar view. A-B, D. Ciliated blastosquare (18-20 hours after fertilization). Note the small blastocoel (bl) on B and spiral cleavage pattern apparent in a slightly compressed blastosquare (D). C. Gastrula with an apical tuft (ap) (27-hours-old). E-F. Two-day-old pilidium (49-53-hours-old) showing bilaterally symmetrical gut (gt) and a long apical tuft. Plane of bilateral symmetry is indicated by dashed line on F and H. G-H. Three-day-old pilidium has a blind gut differentiated into esophagus (es) and stomach (st), a prominent apical tuft, ciliated band (cb), and nascent lateral lappets (lp). The young pilidium increases in size even before onset of feeding due to the expansion of the blastocoel.