. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OPPOSED BANDS IN SABELLID LARVAE 301. Figure 4. Opposed ciliary bunds of Demonax metliiis. Myxicola aes- iltciHLi, and Psi-iul,ipkiiiiilla occelata. (A) Ciliary bands in the right ventral region of larva of D. mediiis. (B) Left lateral view of ciliary bands of 11 -day-old larva of M. aesthetica. (C) Left dorsal view of ciliary bands of 3-day-old larva of P. occelata. Scale bars = 25 fg, food groove; me. metatroch; mo, mouth; pr, prototroch. a single female was 130 () /urn. First and second cleav- ages were distinctl
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OPPOSED BANDS IN SABELLID LARVAE 301. Figure 4. Opposed ciliary bunds of Demonax metliiis. Myxicola aes- iltciHLi, and Psi-iul,ipkiiiiilla occelata. (A) Ciliary bands in the right ventral region of larva of D. mediiis. (B) Left lateral view of ciliary bands of 11 -day-old larva of M. aesthetica. (C) Left dorsal view of ciliary bands of 3-day-old larva of P. occelata. Scale bars = 25 fg, food groove; me. metatroch; mo, mouth; pr, prototroch. a single female was 130 () /urn. First and second cleav- ages were distinctly unequal. At incubation temperatures of 12-13 °C. larvae began swimming by about 18 h after fertilization. By 2 days after fertilization, larvae bore pro- totrochal. food-groove, and metatrochal cilia similar to those seen in Schizobranchia insignis (Fig. 4B). The width of the food groove was about 6 jum in five larvae. As in Demonax medius, the metatrochal band of M. aesthetica was broader than that of S. insignis. Pseudopotamilla occelata. Fertilized eggs of P. occelata were spherical, opaque, negatively buoyant, gray in re- flected light, and surrounded by an elevated envelope. The mean diameter (± one standard deviation) of 15 eggs from a single female was 142 () /u,m. First and second cleav- ages were distinctly unequal. By 3 days after fertilization, larvae bore prototroch, food-groove, and metatroch cilia similar to those seen in Schizobranchia insignis (Fig. 4C). The width of the food groove was about 6 jurn in five larvae. Functional morphology of ciliary bands Food-groove and metatrochal ciliary bands in larvae of all four species behaved like similar ciliary bands in larvae that feed with opposed bands of cilia (, Strathmann et «/., 1972). The directions of effective strokes of cilia were anterior to posterior (prototroch), posterior to anterior (metatroch). and laterally towards the mouth (food groove). All three bands of cilia could arrest their beat, ap
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
