Figure 4.

Computer-generated images of developing loricae from juveniles with vertical and transverse bundles of strips and actual loricae of tectiform choanoflagellates. Bars, 2 μm except figure 4e(v) whose bar is 10 μm. (a) Saepicula pulchra. (i)–(iii) Assembly of the lorica during one rotation (360°). (iv) Lorica of actual specimen. (b) Acanthocorbis unguiculata. (i)–(iii) Assembly of the lorica during one rotation (360°). (iv) Lorica of actual specimen. Arrowheads point to junctions between anterior ends of helical costae and respective longitudinal costae. (c) Stephanoeca diplocostata. (i)–(iii) Assembly of the lorica with 12 longitudinal costae during one rotation (360°). (iv) Lorica of actual specimen with eight longitudinal costae. (d) Parvicorbicula quadricostata. (i)–(iii) Assembly of the lorica. (iv) Lorica of actual specimen. (e) Bicosta spinifera. (i)–(iii) Assembly of lorica during half a rotation (180°). (iv),(v) Loricae of actual specimens.