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Bio III > Lecture 8 - Bilaterian Animals > Flashcards

Lecture 8 - Bilaterian Animals Flashcards

1
Q

Chart: Before Bilateria

A

Porifera, Ctenophora, Cnidaria

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2
Q

Chart: Protostomes group 1

A

Rotifera, Platyhelminthes, Annelida & Mollusca

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3
Q

Chart: Protostomes group 2

A

Nematoda, Tardigrada, Onychophora & Arthropoda

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4
Q

Chart: Deutoerstomes

A

Echinodermata & Chordata

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5
Q

What is a Bilaterian? (6 traits)

A

Bilateral symmetry, triploblastic, true coelom, nervous system, muscles, through-gut

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6
Q

What are the two main lineages of Bilateria

A

Protostomes, Deuterostomes

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7
Q

What is spiral cleavage?

A

Cells divide at oblique angles

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8
Q

What is radial cleavage?

A

Cells are arranged directly on top of each other

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9
Q

What is determinate cleavage?

A

Fate of cell is set in early development, isolated blastomeres cannot develop into an entire animal, cytoplasmic determinants

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10
Q

What is indeterminate cleavage?

A

Fate of cells not set in early development, isolated blastomeres can develop into an entire animal, induction

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11
Q

Traditional model for protostomes cleavage

A

Sprial and determinate

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12
Q

Traditional model for deuterostomes cleavage

A

Radial and indeterminate

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13
Q

Traditional model: formation of protostomes

A

Schizocoelous: solid masses of mesoderm split to form coelom, mouth develops from blastopore

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14
Q

Traditional model: formation of deuterostomes

A

Enterocoelous: fields of archenteron form coelom, anus develops from blastopore

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15
Q

Where is priapulids located?

A

Directly before protostomes group 2

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16
Q

Modern model of Radial cleavage

A

Porifera, Ctenophora, Cnidaria, Rotifera, Priapulid, Echinodermata, Chordata

17
Q

Modern Model of Spiral cleavage

A

Platyhelminthes, Annelida, Mollusca

18
Q

Modern Model of Idiosyncratic cleavage

A

Nematoda, Tardigrada, Onychophora, Arthropoda

19
Q

Modern model of Determinate cleavage

A

Rotifera, Platyhelminthes, Annelida, Mollusca, Nematoda, Onychophora, Some arthropods

20
Q

Modern model of Indeterminate cleavage

A

Tardigrada, some arthropods, Echinodermata, Chordata

21
Q

Modern enterocoelic coelom development model

A

Echinodermata and Chordata

22
Q

Modern Schizocoleic coeolom devolpment model

A

Annelida, Mollusca, Oncyphora, Arthropoda

23
Q

Modern Pseudocoelom coelom development model

A

Rotifera, Nematoda, Tardigrada

24
Q

Modern Acoelomate coelom development model

A

Platyhelminthes.

25
Q

Where is Nemertea located?

A

Between Platyhelminthes and Annelida & Mollusca

26
Q

Where is Polychaeta located?

A

At Annelida

27
Q

Modern Deuterostomy Fate of the Blastopore Model

A

Priapulid, Nemertea, Oncyphora, Echinodermata, Chordata

28
Q

Modern Protstomy Fate of the Blastopore Model

A

Rotifera, Platyhelminthes, Annelida, Mollusca, Nematoda, Tardigrada, Arthropoda

29
Q

Modern Amphistomy Fate of the Blastopore Model

A

Polychaeta

Bio III (18 decks)

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