-plane of symmetry is perpendicular to hinge line
Classes of Brachs - Inarticulata: calcium phosphate shells (mainly), no lever system to
Articulata: calcium carbonate shells, lever system to open valves
-abductor: closing muscle
Paleobiology - a branch of paleontology that deals with the origin and growth and
structure of fossil animals and plants as living organisms
Geobiology - deals with the interactions between organisms and the environment at the
local to global scales throu
Intraspecific variation - difference of physical traits of an individuals among the same
sexual dimorphism - Differences in physical characteristics between males and females
of the same species. For example, humans are slightly dimorphic for body
Primatology - A specialty of Anthropology that studies non-human primates.
The 8 Common Primate traits - -Opposability and Prehensility
-Fingernails and tactile pads
-Hind limb dominated locomotion
-Unspecialized molars/Generalized diet
-Reduced sense of
Archean - This emerged about 3.9 bya, representing the first life on Earth
eukaryote - This first appeared about 2.7 bya
multicellularity - This revolutionary trait appeared about 630 mya
prokaryote - From 3.9-2.7 bya, this was the only recognized life fo
5 major In vertebrate groups of the mesozoic - 1) Mullusca, Caphalopoda Ammonoidea
2) Mollusca Gastropoda 30 Echinodermata Echinoidea (sea urchin), mollusca Pelecypoda
5) Arthropoda Crustacea (lobster, crabs, etc.)
Actinoptrerygians in the Triassic - cont
Acetabulum - Opening (hole) on each side of a pelvis that allows for the insertion of a
ball-like proximal end of each femur. A distinguishing character of a dinosaur.
Adaptation - Physical attribute of an organism that can help it to survive at least lon
Respiratory Turbinates - Spaces within nasal cavities that accommodate folded bony or
cartilaginous structures, often lined with mucous membranes. Considered as an indicator
RNA - Ribonucleic acid.
Ruminant - Herbivore that uses a multi-cha
Meiosis - Splitting of diploid cells into haploid cells, which produces gametes.
Megalosauridae - Clade of saurischian dinosaurs, placed with clades Theropoda and
Tetanurae. Considered as an outgroup of the latter.
Mesozoic Era - Division of geologic time
Paleobiology - Literally known as 'ancient-life forms,' it is a scientific term for
classifying a group of organisms that are no longer existent.
Paleontology - Literally known as 'ancient-study,' it is the scientific term to the study and
research of ext