Aquatic Mandibulates Flashcards
(Subphylum Crustacea) Are the…
Aquatic arthropods
Mandibles are jaw like appendages that…
Crush food
_________: food handling; moving water across gills
Maxillae
_________: touch, taste; equilibrium organs @ base (________)
Antennae, statocysts
________: one or more of the thorax segments are fused with the head, covered w/ a single plate of exoskeleton (_______) w/ MANY specialized appendages
Cephalothorax, carapace
__________: w/ one pair of appendages per segment (in ________ & ________)
Abdomen, Malacostraca, Remipedia
Appendages originally _________ but have become modified w/ branches functioning as gill, tactile structures & etc.
Biramous
_________: long, thin; sensory feeling in murky habitat.
Antennae
________: jaw, broad; cutting surface.
Mandible
________: flat, broad, paddle shaped; used for food handling.
Maxilla
“________” more leg shaped; multi-purpose; _____ attached to most.
Peds, gills
Swimmerets: ________; _______; female has opening in the _______ of abdomen where male delivers sperm packet. Female holds packet until ready for ________.
Reproductive, dimorphic, middle, fertilization
Body Arrangement: __________ (annelids & mollusks too) but most space is ________ & what remains forms ________ or _______.
Schizocoelous coelomate, filled in, blood sinuses, hemocoel
Muscular System: _______ muscles now arranged in pairs whose actions oppose each other (________).
Skeletal, antagonistic
________ draw the part toward the body.
Flexors
________ pull the part away.
Extensors
Smaller crustaceans exchange gases through ___________ of the ________ (usually on the _______)
Thinner regions, exoskeleton, limbs
Larger crustaceans use gills (attached to ___________) that project up under the carapace w/in the “________”; water is directed into this space by the 2nd maxilla (the “______”).
Thoracic legs, gill cavity, bailer
Circulatory System: retains the ________ circulation of the terrestrial arthropods w/ _______ heart that blood enters from the __________ and then is pumped back to the body’s __________.
Open, dorsal, gill spaces, blood sinuses
Excretory System: paired (______) glands sit in _________, filter wastes from blood and dump wastes out openings in _________.
green, blood sinuses, exoskeleton
_______ brain which meets under ________ to form the _______ nerve cord.
Dorsal, esophagus, double ventral
___________ abundant on chelipeds, mouthparts & telson.
Tactile hairs
________ at base of antennae w/ tiny grains whose movements are detected by hairs inside send info to the brain about ________.
Statocysts, body position
Eyes are ________ - composed of smaller units called ________ under a cornea surface.
Compound, ommatidia
Metamorphosis involves several ________ including a larvae (______) and the addition of appendages & segments in later stages.
Molts, naupilus
Molting is the process of making a larger cuticle by secretion of _______ and _______ from the _______ below it.
Proteins, chitin, epidermis
_________ occurs once the attachment of the old cuticle to the epidermis has been severed; the animal swells up & splits the old exoskeleton so it can extract itself.
Ecdysis
_________ feeders use setae to sweep food in towards mouth.
Suspension
Predators and Scavengers use a _______ stomach where _________ in the ________ grind food , then pass it through a _______ into the second part of the stomach then into the intestines for chemical digestion.
Two part, calcareous teeth, gastric mill, sieve
