Class

comprising flowering plants that produce seeds enclosed in an ovary; in some systems considered a class (Angiospermae) and in others a division (Magnoliophyta or Anthophyta)

class Anthoceropsida

hornworts: in some classification systems included in the class Hepaticopsida

class Anthozoa

a large class of sedentary marine coelenterates that includes sea anemones and corals; the medusoid phase is entirely suppressed

class Aphasmidia

one of two subgroups of Nematoda used in some classification systems

class Arachnida

a large class of arthropods including spiders and ticks and scorpions and daddy longlegs; have four pairs of walking legs and no wings

class Archiannelida

a class of Annelida

class Ascidiaceae

sometimes classified as an order: sea squirts

class Ascomycetes

large class of higher fungi coextensive with division Ascomycota: sac fungi

class Asteroidea

sea stars

class Aves

(ornithology) the class of birds

class Bacillariophyceae

marine and freshwater eukaryotic algae: diatoms

class Basidiomycetes

large class of higher fungi coextensive with subdivision Basidiomycota

class Bivalvia

oysters; clams; scallops; mussels

class Bryopsida

true mosses: bryophytes having leafy rather than thalloid gametophytes: comprises orders Andreaeales; Bryales; Dicranales; Eubryales; Sphagnales

class Cephalopoda

octopuses; squids; cuttlefish; pearly nautilus

class Cestoda

tapeworms

class Channidae

snakeheads

class Charophyceae

in some classifications: contains only the order Charales

class Chilopoda

arthropods having the trunk composed of numerous somites each bearing one pair of legs: centipedes

class Chlorophyceae

algae distinguished chiefly by having flagella and a clear green color, their chlorophyll being masked little if at all by other pigments

class Chondrichthyes

cartilaginous fishes

class Chrysophyceae

all the yellow-green algae having flagella of unequal length

class Chytridiomycetes

a class of mostly aquatic fungi; saprophytic or parasitic on algae or fungi or plants

class Ciliata

class of protozoa having cilia or hairlike appendages on part or all of the surface during some part of the life cycle

class Ciliophora

class of protozoa having cilia or hairlike appendages on part or all of the surface during some part of the life cycle

class Coniferopsida

cone-bearing gymnosperms dating from the Carboniferous period; most are substantial trees; includes the classes Pinopsida (subdivision Pinophytina) and Ginkgopsida (subdivision Ginkgophytina) and Taxopsida (subdivision Taxophytina) which in turn include the surviving orders Coniferales and Taxales (yews) and sometimes Ginkgoales as well as extinct orders such as Cordaitales (of the Carboniferous and Permian)

class Crinoidea

sea lilies

class Crustacea

class of mandibulate arthropods including: lobsters; crabs; shrimps; woodlice; barnacles; decapods; water fleas

class Cryptophyceae

motile usually brownish-green protozoa-like algae

class Cyanobacteria

photosynthetic bacteria found in fresh and salt water, having chlorophyll a and phycobilins; once thought to be algae: blue-green algae

class Cyanophyceae

photosynthetic bacteria found in fresh and salt water, having chlorophyll a and phycobilins; once thought to be algae: blue-green algae

class Cycadopsida

palmlike gymnosperms: includes the surviving order Cycadales and several extinct orders; possibly not a natural group; in some systems considered a class (Cycadopsida) and in others a subdivision (Cycadophytina or Cycadophyta)

class Cyclosporeae

in more recent classifications superseded by the order Fucales

class Deuteromycetes

form class; coextensive with subdivision Deuteromycota

class Diatomophyceae

marine and freshwater eukaryotic algae: diatoms

class Dicotyledonae

comprising seed plants that produce an embryo with paired cotyledons and net-veined leaves; divided into six (not always well distinguished) subclasses (or superorders): Magnoliidae and Hamamelidae (considered primitive); Caryophyllidae (an early and distinctive offshoot); and three more or less advanced groups: Dilleniidae; Rosidae; Asteridae

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