Term
| Arthropod characteristics |
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Definition
| Segmented body; dorsal heart and ventral nervous system; Exoskeleton of chitin; Open circulatory system with hemocoel |
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Term
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Definition
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Term
1) Jointed legs
2) Compound eyes |
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Definition
| The two main synapomorphies of arthropods |
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Term
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Definition
| Sister clade to Arthropods and Annelids, sharing traits of both |
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Term
1) segmented bodies
2) paired appendages
3) dorsal vessel or heart
4) ventral nerve cord |
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Definition
| Four shared features of Arthropods and Annelids |
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Term
| Chitin, in cross-linked protein matrix, reinforced with calcium salts in aquatic species |
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Definition
| Exoskeleton structure of arthropods |
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Term
1)Cuticle separates from epidermis
2)Molting fluid dissolves inner cuticle and builds new one
3)Body expands within inner cuticle by taking in water or air, fracturing old cuticle
4)Cross-linking proteins harden cuticle
5)Animal grows into new shell, |
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Definition
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Term
| Kinorynchs, Loriciferans, and Priapulans |
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Definition
| Side clades of arthropods, live in the spaces between grains of sand and mud |
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Term
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Definition
| Benthic clade of kinorynchs, loricipherans, and priapulans |
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Term
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Definition
| "Water bears"; can dry out and remain dormant for years; Feed on plant juices with a piercing mouth; Females lay their eggs inside molted exoskeleton |
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Term
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Definition
| Trilobites; Three-lobed exoskeleton; Calcite compound eyes; some had spines; Extinct for 245 my |
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Term
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Definition
| Individual light sensors in compound eyes |
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Term
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Definition
| Modified front legs used for feeding |
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Term
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Definition
| Clade made up of Merostomata (Horseshoe crabs and Sea scorpions)and Pycnogonidia (Sea Spiders) |
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Term
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Definition
| Sea Spiders; Gonads and gastrovascualr cavity in legs; External digestion, like land spiders |
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Term
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Definition
| Horseshoe crabs and Eurypterid Sea Scorpions; The only chelicerates with compound eyes; Book gills |
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Term
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Definition
| Crustacean; bivalve-like shell; Nauplius larval stage; Seed Shrimp |
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Term
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Definition
| "Gill foot" crustacean; Brine shrimp (sea monkeys are larvae) and Daphnia; Eggs can survive dessication for hundreds of years; Nauplius larvae |
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Term
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Definition
| Clade Branchiopoda; Evolved to adapt to more toxic cyanobacteria; Eggs survive dessication for long periods; Migrate in response to UV levels; Polymorphic by season; Parthenogenetic reporduction |
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Term
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Definition
| A long resting state, often in eggs of branchiopods, surviving dessication for up to hundreds of years. |
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Term
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Definition
| Asexual reproduction by females |
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Term
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Definition
| "Wispy-feet" crustaceans; Barnacles and Sacculina; Nauplius larvae |
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Term
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Definition
| Cirripedia; Hermaphrodites; Longest penis size in relation to body size; grow on rocks, wood, and whale skin |
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Term
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Definition
| Cirripedia; Nauplius stage, then cyprid larva that attaches to a crab; Parasitizes crab and grows out of abdomen; Controls host's hormones |
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Term
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Definition
| "Oar-foot" Crustacean; Nauplius stage; 1˚ consumers of phytoplankton; Migrate to the surface at night, retreat to darker deep by day |
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Term
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Definition
| "Equal feet" crustaceans; Marine species parasitize like ticks, on fish gills or tongue; Pillbugs and Sowbugs are the only terrestrial crustaceans, and breathe with gills |
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Term
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Definition
| "Two-feet" crustaceans; sand fleas have back legs for hopping and are laterally compressed; Skeleton shrimp are microscopic, ambush prey with raptorial appendages; Whale lice live among barnacles and eat flaking skin |
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Term
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Definition
| "ten leg" crustacean; Crabs and lobsters; Krill |
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Term
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Definition
| Crustaceans; Mantis shrimp; have either spears or clubs for spearing or crushing or breaking fish tanks |
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