Lab Practicum #2 Flashcards
are mollusks protostomes or deuterostomes
protostomes, blastopore becomes the mouth
what are the five phylums of Mollusca
polyplacophora
bivalvia
gastropoda
cephalopoda
scaphopoda
does the clam have a circulatory system like ours?
no, clams have a closed circulatory system instead ofd an open circulatory system like ours. They have closed blood vessels and open blood spaces where blood can flow freely throughout the body.
what is the function of the radula
tongue-like, used to process foods, used to scrape and tear the food before it enters the esophagus.
what are two synapomorphies of Anellida
segmentation, setae
what are setae
bundles of filaments made of chitin and protein
what classes are in phylum annelida
class oligochaeta
class polychaeta
class hirudinea
are class Oligochaeta self-fertilizing
no, they can produce egg and sperm but cannot self-fertilize
what is the typhlosole used for
increase intestine for more efficient nutrient absorption
what is the hirudin and how do leeches use it
leeches saliva makes a substance hirudin, which prevents blood from coagulating and it dilates the blood vessels, allowing the wound to bleed for a long time for the leech to feed.
what is the outer covering of phylum arthropoda called?
cuticle/exoskeleton
what are the four synapomorphies of Phylum arthropoda
exoskeleton, jointed limbs, tagmata, compound eye
what are the four subphyla of phylum arthropoda
trilobita
chelicerata
crustacea
uniramia
how long ago were trilobites living
until 250 million years ago
what is the difference between class Diplopoda and Chilopoda
dipolopoda- millipedes (two pairs of legs each segment)
chilapoda- centipedes (one pair of legs each segment)
what are the echinoderm autapomorpies
bilateral larval stage, internal calcium skeleton, water vascular, and tube feet
what are the classes of phylum echinodermata
Asteroidea: sea stars
Ophiuroidea: Brittle stars or snake stars
Echinoidea: Sea urchins and sand dollars
Crinoidea: Sea lilies and feather stars
Holothuroidea: Sea cucumbers
what is the madreporite
opening used to filter water
what is the ambulacral groove
foot groove
how can you tell the difference between class Asteroidea and class ophiorodea
ophiorodea have longer, thinner, and more flexible arms
what is Aristotles lantern
the jaw of the sea urchin
what is embryology
branch of biology that studies embryos and fetuses
what is the difference between an embryo and a fetus
embryo refers to the ball of dividing cells after fertilization for 8 weeks. 9 weeks after. fertilization is a fetus
is a follicle the same thing as an oocyte
no, a follicle will contain an oocyte
where are sperm produced
the seminiferous tubules, located in the testes
the different types of skeletons
exoskeleton- crab
endoskeleton
mammals
hydrostatic skeleton- earthworms
what makes a true skeleton
one that is made of pieces that can be individually moved by muscles
what’s a chondrocranium
cartilaginous skull; shark
homodont vs heterodont
