Adaptation of trilobites

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A level Geology (Trilobites) Mindmap am Adaptation of trilobites, erstellt von mbaker25 am 05/03/2014.
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Zusammenfassung der Ressource

Adaptation of trilobites
  1. Benthonic
    1. E.g. Calymene
      1. Little streamling
        1. Did not swim
        2. Complex compound eye
          1. Good depth of vision
            1. Sensitive to movement
            2. Crescent shaped
              1. Forwards, backward and sideways
            3. Many pleura
              1. enrolling for protection
                1. many gills for respiration
                2. Bottom dwelling
                  1. Active hunters
                    1. Scavengers
                    2. epifaunal

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                    3. Planktonic
                      1. E.g. Agnostus
                        1. Small and light
                          1. no eyes
                            1. Blind
                            2. Few legs and gills
                              1. Found in shales
                                1. Fed on detritus
                                2. Nektonic
                                  1. Small
                                    1. some streamlining
                                      1. complex compound eyes on stalks
                                        1. 360 degree vision
                                          1. active hunter
                                            1. Forwards, sideways, backwards and underneath
                                          2. E.g. Deiphon
                                            1. Numerous pleura, with spines
                                              1. increase surface area
                                                1. aid buoyancy
                                            2. Burrowing
                                              1. E.g. Trinucleus
                                                1. no eyes
                                                  1. found 200m deep
                                                  2. shovel-shaped modified cephalon with pits
                                                    1. digging tool
                                                      1. burrows for protection and feeding
                                                      2. pits housed sensory hairs
                                                        1. Spread its mass
                                                        2. Fed on organic-rich sediment
                                                          1. Infaunal

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