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lophophorates-echinoderms

lophophorates-echinoderms - Lophophorates Several phyla...

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Lophophorates Several phyla included in this group - see textbook (we’re only looking at two). They all have a similar structure surrounding the mouth - ciliated tentacles called a “lophophore”. Other structures (e.g., no distinct head, U-shaped digestive tract) also suggest a relationship. Phylum Bryozoa (5,000? species) - (book calls these “Ectoprocta”; stick with Bryozoa) - colonial animals that resemble mosses (have a hard “exoskeleton”) - “air ferns” - aquatic, sessile, some are important reef builders - [Fig., not in book, but see fig. 33.14a, p. 677] Phylum Brachiopoda (330 living species - 30,000 fossil species) - lamp shells - resemble clams and other mollusks of the class bivalvia - shells are dorsal and ventral, not side to side (symmetry is along a different axis) - looking at one shell, it looks bilateral - the two shells often differ somewhat in size - NOT related to Bivalves. - filter feeders, sessile - [Fig., not in book, but see fig. 33.14b, p. 677] Comment - these used to be considered transitional between protostomes and deuterostomes, butt recent evidence puts them pretty much in the protostomes.
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