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Bio III > Lecture 7 - Non-bilaterians > Flashcards

Lecture 7 - Non-bilaterians Flashcards

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Biology 101 flashcards
1
Q

Characteristics of animal phyla

A

Multicellular, extracellular matrix, no cell wall, cell adhesion, all principles of development, differential gene regulation

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2
Q

Non-bilaterian animals

A

Porifera, ctenophora, cnidaria, placozoa

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3
Q

Placozoa common name

A

Placozoans

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4
Q

Ctenophora include

A

Comb jellies

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5
Q

Porifera common name

A

Sponges

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6
Q

Cnidaria example taxa

A

Jellyfish, corals, anemones, hydroids, sea fans

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7
Q

Porifera

A

Mostly marine species with benthic (bottom of sea floor) and sessile (immobile) adults

Larvae swim via cilia

Asymmetric

Suspension feeding common

Many are symbiotic with photosynthetic organisms

No nervous system/muscles/germ layers

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8
Q

Porifera reproduction

A

Sexual: mostly external fertilization

Aseuxal: fragmentation; budding (gemules)

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9
Q

Classes of sponge

A

Distinguished by spicule type:

  1. Demospongia - spongin and/or silica
  2. Calcarea - calcium carbonate
  3. Hexactinellida - silica
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10
Q

Ctenophora

A

Pelagic (occuring in the open sea)

Propelled by cilia

Cilia are found on iridescent ctenes (comb-like plates)

Predatory- capture prey with colloblast cells

Nerve-net type of nervous system/muscles

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11
Q

Ctenophora reproduction

A

Biradial radial symmetry

Sexual: Mostly hermaphroditic (individual producing both sperm and eggs), this is a type
Most species are self fertile and fertilize mostly with external fertilization

Asexual: by fragmentation

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12
Q

Cnidaria

A

Can be marine or freshwater

Can be benthic or pelagic

Can be sessile or motile

Has a net nerve type nervous system and muscles

Predatory- hunting with cnidocytes (an explosive cell that delivers a sting)

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13
Q

Cnidaria reproduction

A

Often incovles complex life cycles that alternate between sexual and asexual reproduction.

Radial Symmetry

Sexual: mostly external fertilization

Asexual: Budding or fission

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14
Q

Placozoa

A

Benthic marine animals

Herbivores - eat algae

Composed of an outer and inner layer of cells

Propelled by cilia on the bottom cell layer

No nervous system, muscles, or germ layers

Asymmetric

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15
Q

Placozoa reproduction

A

Sexual: no genetic evidence observed for this

Asexual: budding

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Bio III (18 decks)

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