Download Guide to INVERTEBRATE ANIMALS by J. E. Webb, J. A. Wallwork, J. H. Elgood (auth.) PDF

By J. E. Webb, J. A. Wallwork, J. H. Elgood (auth.)

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Canal , :1' °0 , ... :-. • : J :. ~( columella a madreporarian coral 45 paired mesenteries Phylum Ctenophora Radiata in which:- 1. Nematocysts are absent but colloblasts ('lasso cells') are present. 2. Movement is by ciliary action. 3. There is no alternation of generations, the body being neither a polyp nor a medusa. 4. There is no planula larva, but development is through a cydippid-like stage. :.!!!! ~ ~ 'Q"~"-{ Cydippida Cestida Lobata Platyctenea CTBNOPHORA NUDA 46 Beroida Class Tentaculata Ctenophora in which:1.

Example:- Antipathes. Order Madreporaria - True or Stony Corals Zoantharia in which:1. There is a massive calcareous exoskeleton. 2. The tentacles are numerous. 3. There are two siphonoglyphs. 4. They are usually colonial. Examples:- ~, Caryophyllia, Meandrina, Fungia. 37 Order Ceriantharia Zoantharia in which:1. There is no true skeleton. 2. The tentacles are of two kinds, marginal and oral. 3. There is a single dorsal siphonoglyph. 4. They are solitary, burrowing into sand, leaving only the oral disc exposed.

Examples:- Syeon, Grantia, Leucosolenia. 21 Class Hexactinellida Porifera in which:1. e. six-rayed) origin. 2. The choanocytes are small and restricted to flagellate chambers. 3. The flagellate chambers are ovoid. Examples:- Euplectella, Hyalonema (deep sea forms)' Class Demospongiae Porifera in which:1. The skeleton, when present, may consist of siliceous spicules, other than six-rayed forms, and/or spongin. 2. The choanocytes are small and restricted to flagellate chambers. 3. The flagellate chambers are spherical.

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