CLASSIFICATION
saadiaCLASSIFICATION Phylum platyhelminthes has four classes: (a) Class Turbellaria They have over 3, 000 species. They are free-living and aquatic External surface is ciliated. They are predators. They possess rhabdites,…
PHYLUM PLATYHELMINTHES
PHYLUM PLATYHELMINTHES Phylum Platyhelminthes contains over 20.000 animal species. They show following characters: They are flat- worms. They range in adult size from 1mm or less to 25 m. Parenchyma…
Triploblastic Acoelomate Body Plan
THE Triploblastic Acoelomate Body Plan EVOLUTIONARY PERSPECTIVE Members of the phyla Platyhelminthes, Nemertea and Gastrotricha show following advance characters: They are first bilaterally symmetrical animals. Therefore, they are more Complex…
OBJECTIVES
OBJECTIVES Multiple Choice Questions MCQs 1. Portuguese man of war is: (a) Hydra (b) Physalia (c) Sea anemone (d) 550 Jelly fish 2. Multicellular organisms formed year ago: (a) 400 …
SUBJECTIVE QUESTION
SUBJECTIVE QUESTION Write note on origin of multicellularity? How was animal originated on land? Give general characteristics of phylum Porifera? Write note on body wall and skeleton of sponges? Write…
FURTHER PHYLOGENETIC CONSIDERATIONS
FURTHER PHYLOGENETIC CONSIDERATIONS Debate is still going on the position of these phyla. There are different views aboutthe origin of these phyla 1. Polyphyletic: It means that all phyla have…
PHYLUM CTENOPHORA (Or. kteno, comb + phoros, to hear)
PHYLUM CTENOPHORA (Or. kteno, comb + phoros, to hear) Animals in the phylum Ctenophora are called sea wnalnuts or comb jellies. This phylum has 90 described species. These all species…
CLASSIFICATION
CLASSIFICATION Phylum coelentrata has four classes: 1. Class Hydrozoa Hydrozoans are small common cnidarians. Most of the cnidarians are marine. But this class of cnidarians has also freshwater species. Most…
Phylum Cnidaria (COELENTERATA)
PHYLUM CNIDARIA (COELENTERATA) (Or. knide, nettle) Members of the phylum Cnidaria possess radial or biradial symmetry. Biradial symmetryis a modification of radial symmetry . In this case, a single plane…
Phylum Porifera – Characteristics , Types , Functions & Reproduction
PHYLUM PORIFERA The Porifera are sponges. They are primarily marine animals. There are nine thousand species of sponges. There are following characteristics of the phylum Porifera: Their bodies consist of…