Why might this group be so successful?
Because there is so many different diverse animals in Arthropods
Describe the characteristics exhibited by this phylum
Bilateral, triploblastic, coelomate protostomes, Ecdysis (hardened exoskeleton), paired/jointed appendages, segmentation (fused into 2-3 tagmata), Efficient respiratory system, Marine, freshwater, terrestrial, and aerial
How are the segments different than the previous phyla?
- Chelicerata: Segments: 2 main fused body regions (Cephalothorax (prosoma) – head and thorax fused together, Abdomen (opisthosoma)), The original segments are fused into these two large sections, so you don’t clearly see many small segments externally.
- Tardigrada: Segments: 4 distinct body segments, Each segment typically has a pair of stubby legs, Segments are not fused into large regions like in arthropods
How many body segments do arthropods usually have and what are their names?
There are 2 different body segments which are a cephalthorax and Abdomen or head and thorax and abdomen.
What group of arthropods is the most diverse on the planet?
Subphylum Hexapods
Subphylum Chelicerata
Cephalothorax (prosoma) – fused head and thorax/Abdomen (opisthosoma), Chelicerae (pincer-like or fang-like mouthparts used to grasp food), No antennae, 4 pairs of walking legs (8 legs total)
Subphylum Myriapoda
Long/segmented bodies (head and trunk), many legs (not 100 legs), 1 pair of antennae’s
Subphylum Crustacea
pinchers, branched appendages, 2 pairs of antennae
Subphylum Hexapods
3 pairs of legs, mandible mouthparts, Body (head, thorax, abdomen), 1 pair of antennae
What two spiders in the US may be dangerous because of their poison?
Brown Recluse Spiders and Black Widows
Subphylum Chelicerata (Horseshoe crabs, Spiders, Ticks, Scorpions, & Relatives)
Class Merostomata: Horseshoe crabs
Class Arachnida: Spiders, scorpions, and more
Subphylum Myriapoda (Centipedes, Millipedes, and relatives)
Class Chilopoda: Centipedes
Class Diplopoda: Millipedes
Subphylum Crustacea (Crabs, isopods, Barnacles, some zooplankton, and more)
No Class
Subphylum Hexapods (insects & relatives)
Class Insecta: Butterfly, beetle, dragonfly, Praying mantis, Stink bug
What is metamorphosis?
When the body changes over time.
Describe the two types of insect metamorphosis
moths and butterflies
Be familiar with the social behavior exhibited by representatives of this group.
Communication within social structure using pheromones (a chemical released by an animal that affects the behavior or development of other members of the same species through the sense of smell or taste)
What is the name of the method some insects use to produce noise that involves rubbing body parts together?
Stridulation
