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  • Branchiopod | Anatomy, Habitat Adaptations | Britannica
    Branchiopod, any of the roughly 800 species of the class Branchiopoda (subphylum Crustacea, phylum Arthropoda) They are aquatic animals that include brine shrimp, fairy shrimp, tadpole shrimp, water fleas, and other small, chiefly freshwater forms Branchiopods are generally regarded as primitive
  • Branchiopod - Crustaceans, Anostraca, Notostraca | Britannica
    Branchiopod - Crustaceans, Anostraca, Notostraca: Branchiopods are free-living forms and the most primitive crustaceans They have compound eyes, four or more pairs of trunk limbs, small mouthparts, and a primitive nervous system Class Branchiopoda includes the extant orders Anostraca, Diplostraca, and Notostraca, and the extinct orders Kazacharthra and Lipostraca
  • Branchiopod - Freshwater, Aquatic, Filter-Feeders | Britannica
    Branchiopod - Freshwater, Aquatic, Filter-Feeders: Branchiopods use their limbs for locomotion, feeding, and respiration They are noted for their response to light Most of their methods of feeding involve limbs acting together to filter food particles from the water Body structure includes an exoskeleton, trunk, limbs, and a heart that discharges blood into an open body cavity without
  • Branchiopod - Nervous System, Anatomy, Adaptations | Britannica
    The digestive system The branchiopod digestive system shows considerable variation In most groups the esophagus is narrow and has muscles which can dilate and others which can contract so that food can be pushed rapidly into the midgut In many branchiopods the midgut is a simple tube with a pair of blind sacs, or diverticula These diverticula may be simple extensions from the gut, or they
  • Lamp shells - Fossilization, Mollusks, Brachiopods | Britannica
    Lamp shells - Fossilization, Mollusks, Brachiopods: Brachiopods were among the first animals to appear at the beginning of the Cambrian Period They possess a lophophore, excretory organs (nephridia), and simple circulatory, nervous, and reproductive systems Phylum Brachiopoda (lamp shells) has about 300 living species placed into two classes, Articulata and Inarticulata More than 30,000
  • Lamp shells | Animal Anatomy Adaptations | Britannica
    Lamp shells, any member of the phylum Brachiopoda, a group of bottom-dwelling marine invertebrates They are covered by two valves, or shells; one valve covers the dorsal, or top, side; the other covers the ventral, or bottom, side The valves, of unequal size, are bilaterally symmetrical; i e ,
  • Ordovician Period - Marine Life, Trilobites, Brachiopods | Britannica
    Ordovician Period - Marine Life, Trilobites, Brachiopods: Although no fossils of land animals are known from the Ordovician, burrows and trackways from the Late Ordovician of Pennsylvania have been interpreted as produced by animals similar to millipedes A millipede-like organism is inferred because the burrows occur in discrete size classes, are bilaterally symmetrical, and were backfilled
  • Ordovician Period - Invertebrates, Fossils, Extinction | Britannica
    Ordovician Period - Invertebrates, Fossils, Extinction: Invertebrate life became increasingly diverse and complex through the Ordovician Both calcareous and siliceous sponges are known; among other types, the stromatoporoids first appeared in the Ordovician Tabulata (platform) and rugosa corals (horn corals) also first appeared in the Ordovician, the solitary or horn corals being especially
  • Pedicle | brachiopod anatomy | Britannica
    Other articles where pedicle is discussed: lamp shells: Reproduction: In inarticulate larvae the pedicle, a stalklike organ, develops from a so-called mantle fold along the valve margin; in articulates it develops from the caudal, or hind, region





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