Taxonomy- Animal World (classification) Flashcards
(28 cards)
What are animals?
- ONLY ONES WITH NERVOUS SYSTEM.
- holozoic
- heterotrophs
- multicellular organisms
What are Marine animals?
Live in salt waters.
Most of the sponges, coelenterates, chondrithyes (cartilaginous fishes).
What are fresh water animals?
Live in salt free water.
Spongilla (fresh water sponge), Hydra (fresh water coelenterate), ostichthyes (bony fishes).
Whats the difference between pelagic and benthic organisms?
Pelagic - live in free waters like zooplankton ( Daphnia, cyclops, orthopod larvae) and necktons (fishes, whale, dolphin, penguins, turtles).
Benthic - bottom dwellers like starfish, brittle star, devil fish(octopus).
Name and give examples of terrestrial types of animals?
Cursorials: fast runners, use legs for walking like horse, cheetah, cockroaches.
Fossorial: live in burrows like snakes
Scansorials: cling to walls or hang from ceiling like Hemiductylus (wall lizard).
Arborials: live on trees like monkeys, langoons, squirrels.
Aerials: most of the time in flight like birds, most of the insects.
Archenteron is the future 1️⃣Mouth 2️⃣Anus 3️⃣Alimentary canal 4️⃣Both 1 and 2
Alimentary canal
Blastophore forms future 1️⃣Mouth 2️⃣Anus 3️⃣Alimentary canal 4️⃣Both 1 and 2
Future mouth or anus
Name few diploblastic phylum.
Sponges, coelentrata, ctenophora
Name some phylas with triploblastic organisms.
Platyhelmintha onwards
What is coelom?
Its a body cavity lined by mesoderm.
OR
cavity b/w body wall and alimentary canal
What are acoelomates. Give examples
Animals where, mesoderm does not enclose a cavity i.e mesoderm is solid.
for example Platyhelminthes ( flat worms).
- but actually they’re not for they dont have mesoderm.
What are coelomates. Give examples.
Animals where, Mesoderm lines a cavity i.e animals with presence of coelom.
for example Annelida onwards.
Shizocoelomates are animals where
1️⃣Splitting of mesoderm gives rise to coelom
2️⃣Encapsulation of mesoderm give srise to coelom
Option 1
Where Splitting of mesoderm gives rise to coelom.
for example: annelida, arthopoda, mollusca.
Enterrocoelomates are the animals where
1️⃣Splitting of mesoderm gives rise to coelom
2️⃣Encapsulation of mesoderm give srise to coelom
Option 2.
Encapsulation of mesoderm give srise to coelom
What are pseudo coelomates?
Animals with pseudocoelom (mesoderm in the form of scattered pouches OR mesoderm doesn’t line a cavity).
for example Aschehelmithes like ascaris
Name few asymmetrical organisms?
Sponges, pilla(apple snail 🐌)
Name a spherically symmetrical organism.
Volvox (unicellular algae)
Conditions to b called as spherically symmetric are?
When the body can b divided into 2 halves by any plane = spherical symmetry :
▪️Spherical in outline.
▪️No oral and aboral ends
▪️No lateral margins.
Conditions to b called radially symmetric?
Body is divided into 2 equal halves by any plane passing through the centre=radially symmetric:
▪️Body must b spherical, cylindrical or radiating( spread over different axes like in starfish).
▪️Must have oral and aboral ends.
▪️No right or left halves.
Name few radially symmetric organisms
Coelentrates, ctenophore*, some sponges like bath 🧽 sponge, adults of echinoderm.
Bi radially symmetric organism are
Radial symmetry in which org. can b divided into 2 equal halves.
E.g., Sea anemone (Adamsia) and Ctenophora*.
Bi laterally symmetric organisms are
Animals with ✔️Elongated body ✔️Oral and aboral ends ✔️Right and left halves ✔️And can b divided into 2 identical halves by a plane(saggital) passing thru the centre of the body.
Which one is the most advanced symmetry 1️⃣Radial 2️⃣Biradial 3️⃣Spherical 4️⃣Bilateral
4️⃣Bilateral symmetry… bcz its the symmetry displayed by chordates.
Bilateral symmetry is shown by
[NEET]
Platyhelmintha onwards except echinodermata*
[*where the adults show radial (primitive) symmetry and the larvae show bilateral (advanced) symmetry.]
