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24 Cards in this Set
- Front
- Back
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Phylum Hemichordata |
Embryo and early larva: deuterostomes Suggests common origin for echinoderms |
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Phylum Hemichordata |
Includes modern pterobranchs and acorn worms |
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Fossil representative of Hemichordates |
Graptolites (tentatively considered as hemichordates) |
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Class Graptolithina |
Colonial marine organisms Complexly branched colonies or simple linear series of interconnecting tubes |
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Class Graptolithina |
Proteinaceous skeleton Cambrian to Pennsylvanian |
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Zooids structure |
Linear series or in series of clusters, connected to each other by stolons |
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Aperture |
Opening of one colonial cups or tubes |
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Autotheca |
Largest of three cups or tubes produced by each act of budding |
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Basal disk |
Chitinous patch at end of nema for attachment of colony |
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Bitheca |
Small cup or tube accompanying autotheca |
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Nema |
Chitinous threadlike tube which terminates in basal disk at one end and sicula at other in dendroids; in graptoloids was threadlike rod by which colony was suspended |
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Rhabdosome |
Entire graptolite colony, developed by budding from a single sicula |
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Sicula |
Cup belonging to initial zooid of colony |
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Stipe |
Branch of colony, consisting of overlapping thecae |
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Stolon |
Chitinoid tube extending through successive stolothecae of a stipe, and sending off branch stolons to base of each autotheca and bitheca |
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Stolotheca |
Cup or tube of each set of three the car from which a succeeding generation of three the car is budded |
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Theca |
Any cup or tube of colony that housed the zooid |
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Six orders of Graptolithina |
Dendroidea * Camaroidea Crustoidea Stolonoidea Tuboidea Graptoloidea * |
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Order Dendroidea |
Middle Cambrian to Pennsylvanian Attached Most lived in relatively shallow waters |
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Order Dendroidea |
Branching graptolites characterized by two sizes of the car Larger autothecae and smaller bithecae |
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Order Dendroidea |
In most species, stolons included hard, black, organic substance, probably proteinaceous |
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Order Graptoloidea |
Planktonic One type theca (equivalent to autotheca of other gaptolites) on few stiles Ordovician to Early Devonian |
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Phylum Chordata |
Subphylum Vertebrata (Craniata) Class "Agnatha" Subclass Conodonta |
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Conodonts |
Represents a member of the jawless fishes Elongate, eel-like animals |
