Lab 7 Flashcards
Describe the Arthropod subphylum “chelicerata”
The name comes from the “Chelicerae”, which are appendages used for grasping/shredding food. they are the only arthropods without antennae or mandibles, and they are usually divided into the anterior “cephalothorax (prosoma)” and posterior “abdomen (opisthosoma)”.
Cephalothorax has 6 pairs of appendages, usually 4 as walking legs, a pair of chelicerae and a pair of pedipalps
What is the phylum, subphylum, class, genus, and species of this organism? What is the common name of this organism? What are the characteristics of this class?
Phylum -Arthropoda
Subphylum - Chelicerata
Class - Merostomata
Genus - Limulus
Species - polyphemus
Common name: Horseshoe crab
Most of this class is extinct. All have a cephalothorax covered on the dorsal surface by a large horseshoe shaped exoskeleton (carapace).
What is the phylum, subphylum, class, genus, and species of this organism?
Does it have antennae or mandibles?
Why is the shape of the carapace significant?
Name the regions indicated in the photo
Phylum -Arthropoda
Subphylum - Chelicerata
Class - Merostomata
Genus - Limulus
Species - polyphemus
No, chelicerata do not have antennae or mandibles.
Hox gene expression shows that the carapace shape corresponds with the head of other arthropods
A - cephalothorax
B - Abdomen
What is the phylum, subphylum, class, genus, and species of this organism?
Is this organism segmented?
Name the structures indicated. What is the purpose of Structure B? Structure c?
Phylum -Arthropoda
Subphylum - Chelicerata
Class - Merostomata
Genus - Limulus
Species - polyphemus
Yes it is segmented, it just does appear so from a dorsal view
A - Chelicerae
B - The fifth pair of legs are adapted for burrowing and cleaning the gills
C - Tail spine used to flip organism when it is stuck on its back
What is seen on this microscope slide?
Why is this known as the “trilobite larva”?
Larva of Limulus polyphemus
Known as the trilobite larva because Limulus is the closest living relative of trilobites
To what phylum, subphylum, and class does this organism belong? Describe the general traits of this class
Phylum - Arthropoda
Subphylum - Chelicerata
Class - Arachnida
Body divided into cephalothorax and abdomen
Cephalothorax bears 1 pair chelicerae, 1 pair pedipalps and four pairs walking legs. Most Arachnids are predatory
To what phylum, subphylum, class, genus, and species does this organism belong? What is it’s common name? Name the structures indicated. What structures aid in its predatory nature?
Does this organism have antennae or mandibles?
Phylum - Arthropoda
Subphylum - Chelicerata
Class - Arachnida
Genus - Centuroides
Species - vittatus
Common name is scorpion!
A - chelicerae
B - pedipalps (adapted for grabbing/ensnaring/crushing prey)
C - Walking legs
D - Stinger (usually used for defence)
No, chelicerates do not have antennae or mandibles
What is the phylum, subphylum, class, genus, and species of this organism? What is its common name? Name the structures indicated in the photo
How can you tell the difference between males and females of this species?
PHylum - arthropoda
Suphylum - Chelicerata
Class - Arachnida
Genus - Dermacentor
Species - variabilis
Known as the American Dog Tick.
A - Toothed hypostome
B - Chelicerae
C - Pedipalps
Females havea “shield” on the dorsal side
To what phylum, subphylum, and class does this organism belong? Briefly describe the primary features of this class
PHylum - Arthropoda
Subphylum - Mandibulata
Class - Crustacea
Aquatic species found in fresh and salt water. Typically divided into head and trunk, with the head bearing two pairsof antennae, a pairf mandibles and two pairs of maxillae.The trunk is divided into the thorax and abdomen. In some species, some thoracic segments fuse with the head to form a cephalothorax, which is usually covered with a carapace
Name the phylum, subphylum, class, subclass, genus, and species of this organism. What is the common name? What is unique about this subclass?
Name the body regions indicated
Phylum - Arthropoda
Subphylum - Mandibulata
Class - Crustacea
Subclass - Malacostraca
Genus - Homarus
Species - americanus
Otherwise known as the American Lobster.
It is unique because the head and thorax are usually covered in a carapace and combined into a cephalothorax, and the thorax and abdomen appendages may be modified for feeding, locomotion, or respiration
A - Cephalothorax
B - abdomen
List the phylum, subphylum, class, subclass, genus, and species of this organism.
Name the structures indicated. Are the antennae biramous?
Phylum - Arthropoda
Subphylum - Mandibulata
Class - Crustacea
Subclass - Malacostraca
Genus - Homarus
Species - americanus
A - 2nd pair of antennae
B - First pair of antennae
C - Compound eye
Antennae are biramous, branching at the base
List the phylum, subphylum, class, subclass, genus, and species of this organism.
Are the appendages jointed? How have they been modified?
PHylum - Arthropoda
Subphylum - Mandibulata
Class - Crustacea
Subclass - Malacostraca
Genus - Homarus
Species - americanus
Yes, appendages are jointed. Many on the abdomen have been modified for swimming
List 1 advantage and 1 disadvantage of having an exoskeleton
Advantage - Protection, much better than endoskeleton
Disadvantage - Must molt skeleton, living one vulnerable for a period of time
Name the phylum, subphylum, class, subclass, genus and species of this organism. What is the common name for this species? What is the primary difference between this and Homarus americanus?
Phylum - Arthropoda
Subphylum - Mandibulata
Class - Crustacea
Subclass - Malacostraca
Genus - Cancer
Species - magister
Commonly known as rock crab.
Primary difference is that the crab folds its tail under its body and is dorso-ventrally flattened
What stage in Cancer spp. life cycle is this? What stage comes next? What is the purpose of the dorsal spine?
Zoea larva. Next comes the Megalopa larva.
Likely the spine serves as a defence mechanism or to keep the organism afloat in the water column
What is the phylum, subphylum, class, subclass, genus and species of this organism? What are the common features of this subclass?
PHylum - Arthropoda
Subphylum - Mandibulata
Class - Crustacea
Subclass - Branchiopoda
Genus - Daphnia
Species- pulex
Members of this subclass are commonly found in fresh water. They have a reduced abdomen and may have a carapace. First antennae andsecond maxillae are greatly redced,and the abdomen does not carry any appendages
What is the phylum, subphylum, class, subclass, genus and species of this organism? How much is covered by the carapace? Name and describe the structures indicated. Where are the first antennae?
Phylum - Arthropoda
Subphylum - Mandibulata
Class - Crustacea
Subclass - Branchiopoda
Genus - Daphnia
Species - pulex
Most of the body is covered by the carapace, with a small ventral gap.
A - Second pair of antennae, modified for locomotion
B - compound eye (no stalk)
C - Thoracic appendages adapted for bringing in food using water currents
The first antennae arehighly reduced and located near the mouth
What is the phylum, subphylum, class, subclass, and genus of this organism? Does this organism have a carapace? How do the eyes differ from Daphnia pulex? What do the thoracic appendages appear to be used for?
Phylum - Arthropoda
Subphylum - Mandibulata
Class - Crustacea
Subclass - Branchiopoda
Genus - Eubranchipus
No carapace. Stalked eye, swimming appendages
What is the phylum, subphylum, class, subclass, and genus of this organism? Describe the general features of this subclass.
Phylum - Arthropoda
Subphylum - Mandibulata
Class - Crustacea
Subclass - Copepoda
Genus - Cyclops
Usually have a single, non-compound (naupliar) eye. Have long uniramous first antennae and biramous thoracic appendages. Abdomen does not bear any appendages.
What is the phylum, subphylum, class, subclass, and genus of this organism? Describe the basic features of this subclass.
How are the maxillae and antennae used in this organism?
Name the structures indicated
Phylum - Arthropoda
Subphylum - Mandibulata
Class - Crustacea
Subclass - Branchiura
Genus - Argulus
Flattened body, carapace, modified appendages for parasitism.
Maxillae modified for suction, antennae lined with hooks for attachment. Other appendages may have hooks as well.
A - Compound eye
B - Suction cup (maxillae)
C - Abdomen (note: no appendages)
