Graptoloidea
Graptoloidea (subphylum Stomochordata, class Graptolithina) An order of graptolites that existed from the Lower Ordovician to Lower Devonian. The rhabdosomes had up to 8 stipes in early forms, but 2 and finally 1 in later forms. The thecae are of only one type, equivalent to the autotheca of Dendroidea, occur on one or both sides of the stipe, and vary quite widely in morphology. In adults, there is always a sicula bearing a nema. There are 3 suborders: 1, to which no name has been assigned, comprises a single, paraphyletic family, Anisograptidae. The other 2 are Dichograptina and Virgellina.
More From encyclopedia.com
Nonarticulate lampshells , Inarticulata (Ecardines; phylum Brachiopoda) A class of brachiopods whose chitinophosphatic or calcareous valves are held together only by muscles an… Articulata , Articulata
1. (phylum Brachiopoda) A class of brachiopods in which the calcareous valves are impunctate, punctate, or pseudo-punctate. The fibrous or… Paleotaxus Rediviva , Palaeotaxus rediviva The earliest recorded species of the Taxales (yew) family. Found in the Lower Jurassic of Europe, it is distinguished by the for… Baragwanathia longifolia , Baragwanathia longifolia One of the earliest known vascular plants (see TRACHEOPHYTA). During the Devonian and Carboniferous, the lycopods (club moss… cisterna , cisterna (pl. cisternae) Any of the membrane-bound sacs that form the branches of the endoplasmic reticulum (ER) and Golgi apparatus. The cisternae o… Gomphotheriidae , Gomphotheriidae (order Proboscidea) Extinct family of mastodons, characterized by the development of multiple accessory tooth cusps and believed to b…
About this article
Graptoloidea
All Sources -
You Might Also Like
NEARBY TERMS
Graptoloidea