By J. E. Webb, J. A. Wallwork, J. H. Elgood (auth.)
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Additional resources for Guide to INVERTEBRATE ANIMALS
4. The gonads are ectodermal in origin. 5. There mayor may not be a skeleton. 6. The tentacles of the polyp are generally solid. 7. The members almost always form colonies. ~ ~ SUBORDER [ Calyptoblastea Hydroida Gymnoblastea ~ Trachymedusae Trachylina Narcomedusae HYDROZOA Milleporina Stylasterina Siphonophora 28 Order Hydroida Hydrozoa in which:1. There is typically a horny perisarc covering the coenosarc; polyps mayor may not be covered. 2. Medusae (if present) are discoid or bell-shaped. 3. Gonads are borne either on radial canals or the manubrium of the medusa.
The flagellate chambers, where present, are usually elongated. 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.
5. The polyps a~e differentiated into gastrozoids and dactylozoids. Example:- Millepora. 30 Order Stylasterina Hydrozoa in which:1. There is a massive, calcareous external skeleton. 2. The medusae are reduced to sporosacs and are not detached. 3. Gonozoids are lacking. 4. There are no specialized sense organs. 5. The polyps are differentiated into gastrozoids and dactylozoids. 6. Dactylozoids are small, solid and without tentacles. Example:- Stylaster. Order Siphonophora Hydrozoa in which:1. There is no skeleton.