Lab Practical 2 Flashcards
What kind of symmetry does Phylum Mollusca have?
bilateral
What kind of coelom does Phylum Mollusca have?
coelomate
Name the four main morphological features in Phylum Mollusca.
shell, mantle, muscular foot, visceral mass
What animals does Mollusca Bivalvia include?
clams, oysters, mussels, scallops
Where are Mollusca Bivalvia found?
marine and freshwater
How do Mollusca Bivalvia feed?
filter feeding
How is the shell of Mollusca Bivalvia formed?
from the mantle
What is the shell of Mollusca Bivalvia made of?
calcium carbonate (CaCO3)
What type of digestive system does Mollusca Bivalvia have?
complete
What type of circulatory system does Mollusca Bivalvia have?
open
How many chambers does the heart of Mollusca Bivalvia have?
three
True/False: Mollusca Bivalvia have true eyes, containing retina, lens, and cornea.
true
Analogous structure
structure that has the same function but different construction and was not inherited from a common ancestor
Homologous structure
structure that has different mature dorms in different organisms but develop from the same embryonic tissues
Are Mollusca Bivalvia dioecious or monoecious?
dioecious
What type of fertilization do freshwater Mollusca Bivalvia undergo?
internal
What type of fertilization do marine Mollusca Bivalvia undergo?
external
Glochidium
a parasitic larval stage that some Mollusca Bivalvia undergo
During glochidium, where do the larvae nest within the host?
fish gills, skin, or fins
What animals does Mollusca Gastropoda include?
snails, slugs, whelks, limpets, conchs, nudibranchs
Where can Mollusca Gastropoda be found?
freshwater, marine, terrestrial
What is torsion in Mollusca Gastropoda
the anus twists up and sits next to the mouth of the organism
What is the advantage of torsion?
animals are able to draw vulnerable head into body cavity without anus getting in the way
What is the disadvantage of torsion?
fouling (feces contaminates food and breathing)
What is the reproductive system of Mollusca Gastropoda like?
monoecious or dioecious, but always reproduce sexually
What kind of circulatory system does Mollusca Gastropoda have?
open
What kind of digestive system does Mollusca Gastropoda have?
complete
Radula
mouth with rasping teeth used by Mollusca Gastropoda and Cephalopoda to scrape food into mouth
What is the diet go Mollusca Gastropoda?
mostly herbivorous
What animals does Mollusca Cephalopoda include?
squid, cuttlefish, octopuses, Nautilus
Where can Mollusca Cephalopoda be found?
marine
What is the diet of Mollusca Cephalopoda?
predatory carnivore
What is a unique body feature that Mollusca Cephalopoda has?
chitinous beak
What kind of shell do Nautilus have?
gas-filled shell used to determine buoyancy
What kind of shell do cuttlefish have?
cuttlebone (internal)
What kind of shell do squids have?
pen (internal)
True/False: Octopuses have an internal shell.
False
What kind of digestive system does Mollusca Cephalopoda have?
complete
What do the tentacles of Mollusca Cephalopoda do?
grasp prey and direct it into mouth
What do the suckers of Mollusca Cephalopoda do?
hold onto prey
What does the beak of Mollusca Cephalopoda do?
tear prey apart
What is the reproductive system of Mollusca Cephalopoda like?
dioecious
Hectocotylus
a modified arm used by male Mollusca Cephalopoda to transfer sperm to female
How does Mollusca Cephalopoda move around?
jet propulsion
Jet propulsion
fill mantle cavity with water, close mantle, and force water out of siphon
Ink glands
evasion technique used by Mollusca Cephalopoda
What kind of circulatory system does Mollusca Cephalopoda have?
closed
How many hearts does Mollusca Cephalopoda have?
two branchial and one systemic
What is interesting about the eyes in Mollusca Cephalopoda?
human-like eyes, but no blind spot
Chromatophores
pigment cells that change the color of an organism, allowing it to camouflage
How does Mollusca Cephalopoda communicate?
movements and visual cues using chromatophores
Convergent evolution
the independent evolution of similar (analogous) features in different lineages
Ganglia
nerve centers connected by nerve cords in Mollusca Cephalopoda
What kind of symmetry does Phylum Annelida have?
bilateral
What kind of circulatory system does Phylum Annelida have?
closed
Setae
small hair-like structure for locomotion in Phylum Annelida
Metamerism
having repeated body segments
Lophotrochozoans
grow continuously when conditions are good
Where can Phylum Annelida Class Polycheata be found?
marine
What kind of movement does Annelida Polycheata experience?
motile or sedentary
Parapodia
paddle-like appendages on each segment from which setae extend
What does parapodia in Annelida Polycheata do?
helps with respiration and locomotion
What is parapodia modified to do in tube worms?
serve as gills, circulate water through tube, and filter feed via secreted mucus
Clitellum
reproductive structure in Annelida Clitellata that aids in sperm transfer and cocoon formation for eggs
Where can Class Clitellata Subclass Oligochaeta be found?
freshwater and moist terrestrial
What is the genus of earthworms?
Lumbricus
How do earthworms move?
alternating contractions of longitudinal and circular muscles
What divides coelom into halves in earthworms?
Mesentery
Peritoneum
membrane enclosing the coelom
What kind of reproduction do earthworms have?
monoecious
What do earthworms feed on?
detritus and vegetation
What are the stages of earthworm digestive system?
mouth, pharynx, esophagus, crop, gizzard, intestine, anus
What animals does Clitellata Hirudinea have?
leeches and relatives
Where can Clitellata Hirudinea be found?
mostly freshwater (few terrestrial and marine)
What kind of feeding do Clitellata Hirudinea do?
carnivorous or ectoparasitic
What is the strong pharynx in Clitellata Hirudinea used for?
sucking fluids
What is the strong proboscis in Clitellata Hirudinea used for?
penetrating host’s skin
What are the suckers in Clitellata Hirudinea used for?
attachment to host
What kind of symmetry does Phylum Arthropoda have?
bilateral
What kind of coelom does Phylum Arthropoda have?
coelomate
Hemolymph
blood in hemocoel in arthropoda
What is the exoskeleton of Arthropoda made of?
chitin
Ecdysis
shedding/molting of exoskeleton to grow
Tagmata
fused body segments in Arthropoda
What kind of circulatory system do Arthropoda have?
open
In which subphylum are all members extinct?
Trilobitomorpha
What was the size range for Subphylum Trilobitomorpha?
1-75 cm
What do Subphylum Chelicerata use to grasp and tear food?
chelicerae
What two body regions does Chelicerata have?
Cephalothorax, Opisthosoma
What two regions do Chelicerata not have?
mandibles and antennae
Cephalothorax
fused head and thorax
Another word for Cephalothorax
prosoma
Opisthosoma
abdomen
What is the class and genus of horseshoe crabs?
Class Merostomata Genus Limulus
What are the six pairs of appendages in horseshoe crabs?
chelicerae, pedipalps, and 4 pairs walking legs
Chelicerae
detect and manipulate food
Pedipalps
used by males to clasp onto females during copulation
Telson
tail spine used to flip horseshoe crab upright
What do horseshoe crabs use for respiration?
book gills
What kind of circulatory system do horseshoe crabs have?
open
What is used for oxygen transport in blood cells instead of hemoglobin in horseshoe crabs?
copper-based hemocyanin
What color is hemocyanin?
blue-green
Where can Subphylum Chelicerata Class Arachnida be found?
most terrestrial, few aquatic
How does feeding work for Chelicerata Arachnida?
consume liquified prey after external digestion by powerful enzymes
What are the modified chelicerae used for in Arachnida?
fangs for venom injection
What do Arachnida use for respiration?
book lungs
What are the body regions of Arachnida?
Cephalothorax, Pedipalps, 4 pairs walking legs, spinnerets, book lungs
What joins the cephalothorax and abdomen in Arachnida?
slender pedicel
What is used to grasp prey and transfer sperm in Arachnida?
pedipalps
How many segments are on each leg in Arachnida?
7
Spinnerets
used to produce silk for web
Book lungs
air moves into spiracles and moves between thin, blood-filled folds where gas exchange occurs across the this tissue
Subphylum Myriapoda Class Chilopoda
Centipede
Subphylum Myriapoda Class Diplopoda
Millipede
How many pairs of appendages per segment in a centipede?
1
How many pairs of appendages per segment in a millipede?
2
Is a centipede an herbivore or carnivore?
carnivore
Is a millipede an herbivore or carnivore?
herbivore
Do centipedes or millipedes have a pair of appendages modified to become fangs?
centipedes
What are the body regions of centipedes and millipedes?
head, trunk, 1 pair antennae
What is a defense mechanism used by millipedes?
scent glands produce foul odor to ward off predators
Where can Subphylum Crustacea be found?
primarily aquatic, some terrestrial
How do Crustacea respirate?
gills
How many pairs of antennae do Crustacea have?
2
How many pairs of maxillae do Crustacea have?
2
Maxillae
upper jaw
What animals does Subphylum Crustacea Class Malacostraca have?
crabs, lobsters, crayfish, shrimp, krill
Biramous
two-branched appendages
What kind of appendages do Malacostraca have?
biramous
What covers the cephalothorax in crayfish?
carapace
What is the class and genus of crayfish?
Class Malacostraca Genus Cambarus
How many abdominal segments do crayfish have?
6 (first 5 with swimmerettes)
What are used to distinguish sexes in crayfish?
swimmerettes
Another name for Class Branchiopoda Genus Daphnia?
water flea
What is a water flea?
microscopic chordate
What is a common use for water fleas?
water quality indicator; used for ecotoxicology studies
What is the most diverse and successful group of animals?
Class Insecta
In what subphylum can Class Insects be found?
Hexapoda
What percentage of all named species are insects?
> 50%
What do insects use for respiration?
tracheal tubes and spiracles
What does the waxy cuticle do for insects?
prevents desiccation (drying out)
uniramous
unbranched appendages
What are the three tagmata in insects?
head, thorax, abdomen
What are the four main appendages in the head region of insects?
antennae, mandibles, maxillae, labium
labium
bibbed lower lip
What are the three uniramous segments in the thorax region of insects?
prothorax (legs), mesothorax (legs and leathery forewings), metathorax (legs and membranous hindwings)
Where can Phylum Echinodermata be found?
marine
What kind of symmetry does Phylum Echinodermata have?
adults pent-radial, larvae bilateral
What is the endoskeleton of Echinodermata made of?
calcium carbonate ossicles under epidermis
What organ does Echinodermata not have?
brain
What does Echinodermata use for respiration?
dermal branchiae
Dermal branchiae
projections of the coelom that help with respiration and waste removal
What kind of coelom does Echinodermata have?
coelomate
Water Vascular System
system of tubules throughout the body that power tube feet
Madreporite
porous structure for entrance of water into water vascular system
Tube feet
aid in locomotion, prey capture, respiration, and excretion
Protostome
mouth forms from blastopore before the anus
Deuterostome
anus forms from blastopore before the mouth
What animals are in Phylum Echinodermata Class Crinoidea?
sea lilies, feather stars
Ambulacral grooves
lined with large spines with tube feet suckers
What kind of ambulacral grooves does Echinodermata Crinoidea have?
open
What kind of feeding does Echinodermata Crinoidea do?
filter feed
How does Echinodermata Crinoidea filter feed?
secreting mucus along arms to capture prey
What two organelles are absent in Echinodermata Crinoidea?
madreporite, pedicellariae
What are the body regions of Echinodermata Crinoidea?
stalk, calyx, 10 arms
What animal does Echinodermata Ophiuroidea include?
brittle stars
How does Echinodermata Ophiuroidea feed?
filter feeding or active predators
What kind of reproductive system does Echinodermata Ophiuroidea have?
dioecious
How does Echinodermata Ophiuroidea move?
use arms (distinct from central disc) to crawl
Where is the madreporite located on Echinodermata Ophiuroidea?
near the mouth
What kind of digestive system does Echinodermata Ophiuroidea have?
incomplete
What animals are found in Phylum Echinodermata Class Echinoidea?
sea urchins, sand dollars, sea biscuits, and relatives
How does Echinodermata Echinoidea move?
spines (some venomous) which work on a ball-and-socket joint and tube feet
What encases the body of Echinodermata Echinoidea?
globose shell
What is the globose shell made out of?
ossicle plates, forming test
Test
another term for globose shell
What type of ambulacral grooves does Echinodermata Echinoidea have?
closed
How does Echinodermata Echinoidea clean itself?
pedicellariae
What structures does Echinodermata Echinoidea use to respirate?
peristomial gills, dermal branchiae, tube feet
Where is the madreporite located on Echinodermata Echinoidea?
anal surface opposite of mouth
How does Echinodermata Echinoidea feed?
herbivorous or detritivorous
Aristotle’s Lantern
five-part jaw structure with teeth in Echinodermata Echinoidea
Detritivorous
eating plant, algae, organic material on rocks or in sediment
Buccal podia
structure surrounding the mouth of Echinodermata Echinoidea that aids in sensing chemical stimuli
What kind of reproduction does Echinodermata Echinoidea undergo?
dioecious
What animals are found in Phylum Echinodermata Class Asteroidea?
sea stars
What kind of ambulacral grooves does Echinodermata Asteroidea have?
open, along each arm
Is pedicellariae present in Echinodermata Asteroidea?
yes
Where are the anus and madreporite found in Echinodermata Asteroidea?
dorsal surface opposite of mouth
How does Echinodermata Asteroidea move?
tube feet contract, sending water into ampullae
What kind of feeding do Echinodermata Asteroidea do?
active predator
Cardiac stomach
dissolves prey before consumption
Pyloric stomach
nutrient absorption
What nervous system structures are present in Echinodermata Asteroidea?
nerve ring, radial nerves, eyespots
What kind of reproduction does Echinodermata Asteroidea undergo?
dioecious
What animals are found in Phylum Echinodermata Class Holothuroidea?
sea cucumbers
Ossicles on Echinodermata Holothuroidea
microscopic and reduced on long, leathery body
Where is the madreporite found in Echinodermata Holothuroidea?
internally
What type of ambulacral grooves does Echinodermata Holothuroidea have?
closed
What surrounds to mouth of Echinodermata Holothuroidea?
tentacles
What is a defense mechanism used by Echinodermata Holothuroidea?
eviscerating internal organs
What kind of feeding does Echinodermata Holothuroidea do?
filter feeding or detritivores
How does Echinodermata Holothuroidea respirate?
two-branched respiratory tree
How does Echinodermata Holothuroidea respirate?
two-branched respiratory tree
What type of reproduction does Echinodermata Holothuroidea undergo?
dioecious
What kind of symmetry does Phylum Chordata have?
bilateral
Five chordate characteristics
dorsal, hollow nerve cord
notochord
pharyngeal gill slits
postanal tail
endostyle
Dorsal, hollow nerve cord (DHNC)
nerve cord and brain within a fluid-filled cavity
Notochord
cartilage-like slender rod of connective tissue for support and muscle attachment (in vertebrates, only present in embryonic stage then replaced by vertebral column)
Pharyngeal gill slits
paired slits in the pharynx for passage of water (only in embryonic stage in certain species; slits develop into ear, throat, and cranial structures in certain organisms)
Postanal tail
may or may not persist in adults
Endostyle
becomes the thyroid gland in certain organisms
What genus is found in Phylum Chordata Subphylum Cephalochordata?
Amphioxus
Where is Chordata Cephalochordata found?
marine
Amphioxus
move water into mouth where it passes through wheel organ and pharyngeal slits to filter food out and then water is released through atriopore
What animals are found in Phylum Chordata Subphylum Urochordata?
tunicates and sea squirts
Tunic
tough, fibrous body coating