Phylum Arthropoda Flashcards
Subphylum Chelicerata (scorpions, spiders, mites.) classes Merostomata & Arachnida
Lack of antennae, 6 pairs of appendages (4 used for locomotion) ex. scorpions, spiders, mites
Class Merostomata (Horseshoe Crabs)
book gill’s, body covered with u-shaped carapace, all five pairs of appendages on cephalothorax
Class Arachnida
appendages for handling food called pedipalps, Chelicerae are like fangs
Subphylum Myriapoda (clades chilopoda & diplopoda)
ex. centipedes and millipedes
Class Chilopoda (centipedes)
-1 pair of legs per body segment
-enlarged maxillipeds
-appendages of head modified fangs with poison gland
Clade Diplopoda
-2 pairs of legs on most body segments
-cylindrical body that can roll into a planispiral shape
-mandible near mouth
Subphylum Crustacea (crabs, barnacles, etc.)
clade branchiopoda (gill-feet)
clade thecostraca (barnacles)
clade malacostraca (soft shells)
Subphylum Crustacea
Carapace dorsal enlarged to cover organs
Several pairs of appendages
Female and male swimmerets are different
Internal Crustacea
Growth via ecdysis (shedding)
Branchiopoda (crustacean)
Daphnia- clear sac like organism
Fairy Shrimp- split tail at end
Malacostraca (crustacean)
Isopods- belt like dorsal shields
Crayfish- Joined head and thorax
Amphipod- large coxal plates going over base of legs
Class Insecta (insects)
distinguishing features: 3 pairs of legs projecting from thorax, 2 pairs of wings
Compound eye vs Simple eye
Insects have compound eyes and arachnids have simple eyes, along with most other phylum
Class Insecta (Subphylum Hexapoda)
Ovipositor at tail end in females, males have external genitalia
Insect cardiovascular structures
spiracles along body wall allows o2 passage into trachea
