. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. In i. FIGURES 10-11. Pseudopolydora pancibranchiata: 10) pelagic 13-setiger larva in ventral view: 11) pelagic 13-setiger larva in dorsal view. segment has shorter setae. Notopoclial lobes are distinguishable on setigers 3, 4 and 5. Stiff sensory cilia are associated with the lobes. Larvae swim near the surface of the water and edge of the dish but regularly move to the bottom. There they maneuver in loop-the-loop fashion scraping their oral area along the bottom in an effective feeding activity. They tend to swim with poste
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. In i. FIGURES 10-11. Pseudopolydora pancibranchiata: 10) pelagic 13-setiger larva in ventral view: 11) pelagic 13-setiger larva in dorsal view. segment has shorter setae. Notopoclial lobes are distinguishable on setigers 3, 4 and 5. Stiff sensory cilia are associated with the lobes. Larvae swim near the surface of the water and edge of the dish but regularly move to the bottom. There they maneuver in loop-the-loop fashion scraping their oral area along the bottom in an effective feeding activity. They tend to swim with posterior end bent down and the long larval setae angled upward. Larvae with eight setigers remain near the bottom with greater regularity and they also often swim ventral side up. PELAGIC 13-SETiGER LARVAE (Figs. 10-11}. A 13-setiger larva measures 640 p. in length and is fusiform. The head width is greatly increased by expansion of the lateral lips of the vestibule. Palps arise from the dorsolateral region of the peristomium. Each palp has a ventral ciliated groove. The six eyes are similar in arrangement to those of the 6-setiger stage. A nuchal ridge is present with areas of rapidly beating cilia on either side. The prototroch is well-developed with several long tactile cilia emerging from various locations. Nototrochs begin on setiger 3 and continue on posterior setigers. Setiger 3 has four patches, setigers 4-8 have six patches and setigers thereafter have four again. Gastrotrochs occur on setigers 3, 5, 7, and 11. Those on setiger 3 are small and often lost at this stage. There are four patches on setiger 3 and six on 5, 7, and 11. The telo- troch, which is composed of several patches of cilia, encircles the anal segment, but. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Wo
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
