Arthropoda (9,10) Flashcards
How are Coelomate Protostome body cavities formed?
formed by the splitting of mesoderm during embryonic development.
What type of body cavity do Arthropods possess?
Coelomate Protostomes
What is the most diverse phylum with over 1.1 million species?
Phylum Arthropoda
What is the exoskeleton of arthropods made of?
Chitin.
What process involves the fusion of body segments into functional groups?
Tagmatization
What system in arthropods allows for direct oxygen delivery to tissues?
Tracheal system.
What is Tagmatization?
A process in which the body segments fuse into functional groups
What is a key feature of the exoskeleton of Subphylum Trilobita?
Mainly chitin, with some areas strengthened by calcium carbonate
How many Tagmata do Chelicerates possess, and what are they called?
2
- Prosoma
- Opisthoma
What are the six pairs of appendages found in Chelicerates?
-Chelicerae
-Pedipalps
- four pairs of walking legs.
Which subphylum includes horseshoe crabs and sea spiders?
Subphylum Chelicerata
Which class of Chelicerata includes spiders, scorpions, and ticks?
Class Arachnida
How many pairs of walking legs do Arachnids have?
Four pairs
What are the two main body regions of arachnids?
Cephalothorax and abdomen
What structures do spiders use to inject venom into prey?
Chelicerae with terminal fangs
What organ is used by spiders for respiration?
Book lungs or tracheae
What organ helps spiders excrete waste?
Malpighian tubules
What sensory structure do spiders use to detect environmental vibrations?
Sensory setae (sensilla)
How do male spiders transfer sperm during reproduction?
By using pedipalps
What material do spiders produce that is stronger than steel?
Silk
What are two dangerous spider species mentioned in the presentation?
Black widow (Latrodectus) and Brown recluse (Loxosceles)
What part of a scorpion’s body contains its venomous sting?
The postabdomen (metasoma)
What are the sensory organs used by scorpions to explore the ground and for sex recognition?
Pectines
What type of reproduction is observed in scorpions?
Viviparous (giving birth to live young)
What type of body fusion is observed in harvestmen (Order Opiliones)?
Prosoma broadly joined to the opisthosoma, giving an ovoid appearance
How many legs do adult mites and ticks have?
Eight legs
What structure do ticks use to attach to their hosts?
Hooked mouthparts (hypostome).
What are the four classes within Subphylum Myriapoda?
Diplopoda, Chilopoda, Symphyla, Pauropoda.
How many pairs of legs per segment do centipedes (Class Chilopoda) have?
One pair of legs per segment.
How many pairs of legs per segment do millipedes (Class Diplopoda) have on their abdominal segments?
Two pairs of legs per segment.
How do spiders digest their prey?
By externally liquefying prey tissues with digestive fluids before sucking them in\
What is the function of the spider’s pharynx and pumping stomach?
To suck in liquefied prey after external digestion.
How many spinnerets do spiders typically have for silk production?
Six to eight spinnerets.
How long can scorpion courtship last?
From 5 minutes to several hours.
How long does it take for scorpions to mature?
1 to 8 years.
Are harvestmen venomous?
No, they are not venomous.
How does the exoskeleton of female ticks differ from males?
Females are less sclerotized (softer) to expand when engorged with blood.
