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"Cheir"
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"Cheir"
Chelicerates, chelicerae
(Arthropods) --- are named for clawlike feeding appendages called ---.
uniramians, mandibles
(Arthropods) In contrast to the chelicerates, --- and crustaceans have jawlike ---.
antennae, compound
(Arthropods) Uniramians and crustaceans are distinguished from chelicerates in having one or two pairs of sensory --- and usually a pair of --- eyes.
focusing
(Arthropods) Compound eyes are multifaceted, with many separate --- elements.
uniramous
(Arthropods) Uniramians have one pair of antennae and --- (unbranched) appendages.
two, biramous
(Arthropods) Crustaceans have --- pairs of antennae and typically --- (branched) appendages.
Silurian, Devonian
(Arthropods) Evolutionists say that chelicerates, insects, millipedes, and centipedes diversified on land during the late --- and early --- periods, following the colonization of plants.
chelicerates, 450
(Arthropods) Evolutionists say that the oldest fossil signs of terrestrial animals are tracks of extinct --- (eurypterids that spent at least some of their time on land) almost --- million years old.
Trilobita
Arthropods, phylum recognition: mainly extinct
Chelicerata
Arthropods, phylum recognition: horseshoe crabs, scorpions, ticks, spiders, and an extinct group called the eurypterids
Uniramia
Arthropods, phylum recognition: centipedes, millipedes, insects
Crustacea
Arthropods, phylum recognition: crabs, lobsters, shrimps, barnacles, etc.
Arachnida
Arthropod class recognition: spiders, scorpions, ticks, mites
Arachnida
Arthropod class recognition: Body having one or two main parts; six pairs of appendages (chelicerae, pedipalps, and four pairs of walking legs); mostly terrestrial
Diplopoda
Arthropod class recognition: millipedes
Diplopoda
Arthropod class recognition: Body with distinct head bearing antennae and chewing mouthparts, segmented body with two pairs of walking legs per segment; terrestrial; herbivorous.
Chilopoda
Arthropod class recognition: Body with distinct head bearing large antennae and three pairs of mouthparts; appendages of first body segment modified as poison claws; trunk segments bear one pair of walking legs each; terrestrial; carnivorous.
Chilopoda
Arthropod class recognition: centipedes
Insecta
Arthropod class recognition: Body divided into head, thorax, and abdomen; antennae present; mouthparts modified for chewing, sucking, or lapping; usually with two pairs of wings and three pairs of legs; mostly terrestrial.
Crustacea
Arthropod class recognition: Body of two or three parts; antennae present; chewing mouthparts; three or more pairs of legs; mostly marine
Permian, 250
(Arthropods) Evolutionists say that trilobites were common denizens of the Paleozoic era but disappeared with the great --- extinctions that ended that era, about --- million years ago.
fuse, appendages
Evolutionists say that as arthropods continued to evolve, the segments tended to --- and become fewer in number, and the --- became specialized for a variety of functions.
eurypterids
(Arthropods) Evolutionists say that trilobites were outlasted by the ---, or water scorpions.
chelicerata
(Arthropods) Eurypterids were mainly marine and freshwater predators, up to 3 m long, belonging to phylum ---.
cephalothorax, abdomen
(Arthropods) A chelicerate has an anterior --- and a posterior ---.
chelicerae, fangs
(Arthropods) A chelicerate's appendages are more specialized than those of trilobites, and the most anterior appendages are modified as --- (either pincers or ---).
marine
(Arthropods) Most of the --- chelicerates are extinct. Only four known species survive today.
Arachnida
(Arthropods) The bulk of modern chelicerates are found on land in the form of class ---.
chelicerae, pedipalps
(Arthropods) Arachnids have a cephalothorax with six pairs of appendages: the ---, a pair of ---, and four pairs of walking legs.
chelicerae
(Arthropods) As the spider --- masticate the prey, the spider spills digestive juices onto the torn tissues. The food softens, and the spider sucks up the liquid meal.
book lungs, internal
(Arthropods) In most spiders, gas exchange is carried out by --- ---, stacked plates contained in an --- chamber.
O2, hemolymph
(Arthropods) The extensive surface of book lungs enhances the exchange of -- and CO2 between the --- and air.
Pedipalps
(Arthropods) In spiders, --- usually function in sensing or feeding.
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