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- "joint foot"
- largest phyllum
- chitinous exoskeleton
- jointed apendages
- segmented appendages
- compound eye
- coelom reduction
- open circ. system
- Trilobita "three lobed"
- Chelicerata "horn"
- Mandipulata "mandibles"
- "three lobed"
- body divided into a cephalon, thorax, and pygidium
- compound eye
- 2 tagma: cephalothorax and abdomen
- no antennas
- chilicera (1st appendage) after mouth
- pedipalos (2nd appendage)
- 4 pairs of thoracic appendages
- 3 extant classes
- Arachnida "spider"
- Merostomata "part mouth"
- Pycnogonid "gony knee"
- argest and most varied arthropod group
- mandibles (jaws)
- distinct tagma encased on hardened head capsule
- Crustacea "crust"
- Uniramia "unbranched legs" / Tracheata "trachea"
- "crust" shell
- 2p antennas
- 3 pairs of mouthparts(pair of maxillipeds, maxillae, )
- 5 pairs of appendages for walking (include swimmerets)
- 1p compound eyes
- tagmosis on trunk
- biramous segmental appendages
- setae (chitonous hairs)
Tracheata / Uniramia
- "trachea" / "unirama"
- terrestrial, few aquatic
- breath by trachea
- uniramous = single branching appendage
- 1p of antennae
- 2p of mouthparts (single pairs of mandibles and maxillae)
- Hexapoda "6 legged"/ insecta "insect"
- Myriopoda "million legs"
- "6 legged"
- terrestrial, some fresh water
- small size
- 1p antenna
- 1p mandibles
- 2p maxilla
- 2 clades
- "million legs"
- centipedes millipedes ect
- Apterygota "wingless insect"
- Pterygota "winged insect"
- "wingless insects"
- direct developement
- "winged insects"
- can be exopterygotes or endopterygotes
- Exopterygotes "wings out"
- -hemimetaboulus development
- -larva similar to adult
- -external wing buds
- ex:dragonflie, crickets, termites
- Endopterygotes "wings in"
- -larva distinct from adult (pupa)
- -internal wing bud
- ex:butterfly, moths, bees, flies
fusion of body segments
- sweeps food into the mouth
- The external branch of the appendages
regional modification of segmental appendages
- Area between body and carapace enclosing branchiae
- bears the eyes of the arthropod
larvea form of crustacean
- upper lip made of exoskeleton
- Terrestrial arthropod
- takes in gas and nitrogenous wastes
- released out the anus w/ fecal matter.
distinct larval vs. life history stradegies
- appendage that aids in pushing food into mouth
- compound eyes with multiple units
- each eye acts as a pixel
- internal projection of exoskeleton
- site of muscular attachment
- aids in movement and digestion
endopod vs. uropods
- endopod - anthropod appendage for walking (uniramium)
- uropod - posterior appendages for swimming (crustaceans)
- fused head and thorax
- terminal end of abdomen
- upper lip
- 2nd maxilla fused and rigid
hemimetabolous vs. holometabolous
- hemimetabolous - larval form is adult form
- holometabolous - larval form to adult form
- chambers with leaf-like plates for exchanging gases
fluid filled cavity in open circ. system
sense organs with extreme sensitivity
multiple eyes (each eye acts like a pixel)
primary ingredient in exoskeletons in arthropods
biramous vs uniramous
- uniramous:single series of segments attached end-to-end
- biramous:each branch consists of a series of segments attached end-to-end
- larval stage of crustaceans
- contain all body segments
- may lack appendages
hardened head shell
- branching networks of hollow air conducting tubes such that air is sent to every cell within the tissue
- first pair of modified feeding structures
- self amputation
- regenerating lost segments during subsequent molts