Outlines of zoology . This has been emphasised byProfessor Ray Lankester in the term Parazoa; he speaksof them as a sterile stock. Their origin is wrapped in obscurity ; it may be thatthey are the non - progressive descendants of primitivegastrula-like ancestors with a sluggish constitution. Thepresence of choanocytes suggests a relationship with certainof the flagellate Protozoa (Choanoflagellata), and Protero-spongia (Fig. 55) may possibly be regarded as a connectinglink. Incert^ Sedis. Mesozoa The title Mesozoa was applied by Van Beneden to some simpleorginisms which appear to occupy a very
Outlines of zoology . This has been emphasised byProfessor Ray Lankester in the term Parazoa; he speaksof them as a sterile stock. Their origin is wrapped in obscurity ; it may be thatthey are the non - progressive descendants of primitivegastrula-like ancestors with a sluggish constitution. Thepresence of choanocytes suggests a relationship with certainof the flagellate Protozoa (Choanoflagellata), and Protero-spongia (Fig. 55) may possibly be regarded as a connectinglink. Incert^ Sedis. Mesozoa The title Mesozoa was applied by Van Beneden to some simpleorginisms which appear to occupy a very humble position in the MESOZOA. 135 Metazoan series. He regarded them as intermediate between Protozoaand Metazoa; but others have remarked on their resemblance toPlatyhelminthes, and especially to the sporocysts of certain may perhaps be regarded as precociously reproductive will be enough here merely to notice four types :— I. Dicyemidas (type Dicyema) occur as parasites in Cephalopods;.
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192, booksubjectzoology
