| Hexapoda | Chelicerata | Echinodermata | Hemichordata | Chordata |
|---|---|---|---|---|
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How do entognaths differ from insects?
They have mouthparts that originate inside the head capsule, no wings, no or poorly developed Malpighian tubules.
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What are general characteristics of chelicerates?
8 legs, pedipalps often modified, claws near mouth (often modified), 2 part body plan (prosoma and opisthosoma), no antennae.
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Are echinoderms bilaterally or radially symmetrical?
The first as larvae, the second as adults.
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What are major characteristics of hemichordates?
Stomochord, benthic, dorsal hollow nerve chord, pharyngeal slits.
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What are the main characteristics of Phylum Chordata?
dorsal hollow nerve chord, ciliated pharyngeal slits, post-anal tail, notochord
|
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What are unique characteristics of hexapods?
Only invertebrates that evolved complete metamorphosis and wings, 3 segmented thorax, large fat body, labium.
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What are characteristics of Merostomata?
Carapace, compound eyes (possibly) and ocelli, book lungs, genital operculum, pedipalps and most legs modified to end in claws.
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What are characteristics of Class Crinoidea.
Stalked, oral surface pointed upwards, suspension-feeders.
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What are major characteristics of Class Enteropneusta?
Body segments of proboscis, collar, trunk; tubular digestive system.
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What are main characteristics of Subphylum Urochordata?
Covered by a tunic, notochord and dorsal hollow nerve chord only in larvae.
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What is the insect ear?
Have an external tympanum.
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How might the opisthosoma be modified in arachnids?
Into two segments called mesosoma and metasoma.
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What is autotomy?
ability to detach a body part
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What is a stomochord?
anterior extension of pharynx
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What are representatives of Class Ascidiacea?
sea squirts
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How can insects breathe?
Can contract and relax tracheal walls.
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How are the chelicerae modified in spiders?
fangs
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What are major characteristics of Class Ophiuroidea?
Arms distinct from central disc and may branch; calcareous plates on aboral surface; no anus.
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How does the stomochord function?
may support proboscis and help in burrowing
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What is the atrial siphon?
water exits
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How do insects develop during hemimetabolism?
A gradual change from a juvenile to an adult body plan.
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What is the difference between a spinneret and a silk gland?
The first weaves the silk, the second produces the silk.
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What are respiratory trees and how do they function?
Water enters and exits organ through cloaca.
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What are major characteristics of Class Pterobranchia?
Stomochord, secrete tubes, ciliated tentacles on anterior, U-shaped gut, colonial.
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What are characteristics of Class Thaliacea?
pelagic, buccal and atrial siphons at opposite ends of body, adults without tail
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