Palaeontology Flashcards
(22 cards)
Name the 3 lobes on a Trilobite.
Cephalon (Head)
Thorax (Body)
Pygidium (Tail)
What his name
DAVID
What are the additional parts on a Trilobite Cephalon
Glabella = (Usually) round head skull thing Idfk
Calcite eyes
Geraldine spine
What are the additional parts on a Trilobite (Thorax)
Thorasic segment (Pleura)
Genal spines
What is the Pygidium (Tail) made of?
Fused tail segments
What is the law of uniformitarianism?
The present is the key for the past
Descendants n shit
Pelagic definition
Living in water columns.
Benthonic definition
Living on sea floor
Nektonik definition
Free swimming
Planktonic definition
Floating
Epifaunal meaning
On the floor (underwater)
Infaunal definition
Burrower
What are the telltale signs a Trilobite is benthonic or pelagic?
Larger legs than gills = Benthonic
Larger gills than legs = Pelagic
When were Graptolites extant?
Ordovician - Silurian
What is the anatomy of a Graptolite arm?
Arm is called a stipe, and has the little spikes on it called Theca where filter feeding zooids live. All connected to a common resource sharing canal.
Oldest to youngest extinct cephalopods (+ suture line complexity)
Oldest:
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Goniotites (Simple suture, rounded saddle, pointed lobe)
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Ceriatites (Medium suture, rounded saddle, fluted lobe)
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Ammonites (Fluted lobe + saddle
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Cephalopods have a… (shell)
…Coiled and chambered shell
What is gape and what does it indicate?
Gape is a permanent opening between valves and signifies a bivalve is benthonic epifaunal
What Is the OG part of the shell where the Bivalve or Brachiopod grows from called
The Umbo
What Is a pallial sinus?
An organ in a Bivalve that brings siphoning tubes back inside the shell after feeding.
What are the upper and lower valves of a Brachiopod called?
Upper = Brachial valve
Lower = Pedicle valve
What does the Succus + Fold do?
Stop the Brachiopod shearing in high energy environments
