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Sexual reproduction is unknown for the trichomon- ads, but has been observed in some hypermastigotes. Medusae are tetramerously symmetrical as are scyphomedusae and four radial canals and four tentacles are usually present. Gill slits probably first evolved as a mechanism to fa- cilitate water flow through the mouth and then out via the slits and pores, thereby enhancing gas exchange. 870 CHAPTER TWENTY-THREE Figure 23.19 Development in a cephalochordate. (A) Coeloblastula. (B–C) Early and late gastrulae. (D) The neur- al groove stage (section).
Pages: 498
Publisher: Wiley-Liss; Volume 12 edition (August 17, 1993)
ISBN: 0471561193
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read online Parasites on Parade: Edition 2 pdf, azw (kindle). Gonochoristic or hermaphroditic; development variable. Cleavage radial, holoblastic, subequal or slightly unequal. Tadpole stage is expressed at some point in the life history of all taxa BOX 23C Characteristics of the Phylum Chordata UNCORRECTED PAGE PROOFS 860 CHAPTER TWENTY-THREE (A) (B) (C) (D) (E) (F) Figure 23.14 Thaliaceans and appendicularians. (A–B) External and sectional views of the colonial thaliacean Pyro- soma. (C) A solitary thaliacean (Salpa). (D) The solitary thali- acean Doliolum. (E) A colonial form of Salpa. (F) The appen- dicularian Stegasoma in its gelatinous house. (G) Oiko- pleura, an appendicularian removed from its gelatinous house. (H) Oikopleura in its house ref.: Florida's Fabulous Spiders download pdf
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