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BIOL 113 (Animal Biology) > Parazoa And Metazoa > Flashcards

Parazoa And Metazoa Flashcards

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1
Q

Platyhelminthes AKA

A

Flatworm

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2
Q

Nematoda AKA

A

Round worms

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3
Q

Cnidarians AKA

A

Coelenterates

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4
Q

What is the single phylum in Parazoa?

A

Phylum porifera

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5
Q

Porifera AKA

A

Sponges

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6
Q

Xtics of porifera?

A

• sponges

• Most primitive multicellular

• Adults are sessile

• Hermaphrodites

• major body opening is EXHALANT( osculum) ••••

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7
Q

What were porifera named based on

A

Have incessant pores on body surface called OSTIA.

Ostia is linked to inhalant canals.

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8
Q

What is the major body opening in porifera?

A

EXHALANT — OSCULUM

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9
Q

Why are Porifera often colored?

A

Due to interactions with symbiotic algae.

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10
Q

What is the layer lining the internal ceolom of Porifera called ?

A

Gastral layer / choanoderm

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11
Q

What is the choanoderm composed of in porifera?

A

Collared flagellated cells called CHOANOCYTES

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12
Q

Reproduction is

A

Asexual and sexual

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13
Q

Amphiloblastula is

A

One of the diff. larval forms in porifera

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14
Q

Classes under Phylum porifera

A

Calcarea ( skeleton consists of calcareous spicules)

Hexactinellida (six-rayed spicules)

Demospongiae (no skeleton, jelly filled choanocytes)

Sclerospongiae (leuconoid marine)

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15
Q

What is leuconoid?

A

Whitish

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16
Q

Porifera means

A

Bearing pores

Pore - bearing

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17
Q

What is the single phylum in parazoa?

A

Porifera

18
Q

Phylum Porifera is also called

A

Sponges

19
Q

Which are the most primitive multicellular animals?

A

Parazoa

20
Q

Porifera adults are mainly

A

Sessile and attached to rock surfaces

21
Q

What is the primary opening in Parazoans/ Porifera?

A

EXHALANT

22
Q

Sexual nature of Porifera?

A

Hermaphroditism

23
Q

Four phylum under Porifera

A

Calcarea- calcareous spicules

Hexactinellida- six rayes silíceous spicules

Demospongiae- no skeleton or if present doesn’t have six rayed spicules

Sclerospongiae- leuconoid

24
Q

Levels of organization in Metazoa

A

Diploblastic

Triploblastic

25
Q

Principal opening in Metazoa

A

Inhalant

26
Q

What line the ceolom of Metazoa

A

Endoderm cells NOT choanocytes

27
Q

Diploblastic body in Metazoa is attained by

A

Cnidarians (coelenterates)

28
Q

Phyla in Metazoa

A

Cnidaria- coelenterates

Mollusca-

Platyhelminthes- flatworms

Nematoda- round worms

Arthropoda

Echinodermata

29
Q

Xtics of phylum Cnidaria

A
  • coelenterates
  • single ceulom called ENTERON
  • mouth surrounded by tentacles
  • tissue level of organisation
  • radial symmetry
  • sedentary or free swimmers
  • asexual by budding
30
Q

Nematocysts in Cnidaria serve for

A

Defense and capture, found on tentacles.

31
Q

The single ceolom in Cnidaria is

A

ENTERON for ingestion and digestion

32
Q

Polymorphism is exhibited by

A

Cnidaria

33
Q

What forms do Cnidaria show in polymorphism?

A

Hydroid(polyp)

Medusoid

34
Q

The medusoid in Cnidaria are

A

Free swimming

35
Q

The hydroids (polyp) forms in Cnidaria are

A

Sedentary/ solitary/ colonial

36
Q

The 3 classes under Cnidaria are

A

Hydrozoa

Schyphozoa

Anthozoa

37
Q

Xtics of class hydrozoa

A
  • polyp(hydroid) and medusoid forms present
  • hydroid is predominant, Medusa the simplest stage
  • reproduction by alternation of asexual and sexual phases
38
Q

Examples of class hydrozoa.

A

Hydra, Physalia (Portuguese man of war)

39
Q

Xtics of class scyphozoa

A

Nematocysts in the ectoderm

No gullet

Exclusively marine

Hydroid stage often absent or reduced to small larvae, gives rise to Medusa by TRANSVERSE FISSION

40
Q

Examples of class scyphozoa

A

Aurelia ( jellyfish)

Pelagia

41
Q

Xtics of class Anthozoa

A

Exclusively marine

Largest class in Cnidaria

Only polyps/ hydroids occur

Nematocysts in endoderm

42
Q

Examples of class Anthozoa

A

Actinia- sea anemone

Astrangia- coral

BIOL 113 (Animal Biology) (6 decks)

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