Bazsites.com Hemichordata

Directory Topics

Introduction to the Hemichordata - UCMP Berkeley's introduction to the acorn worms. The site includes information on graptolites.
Class Enteropneusta - Anatomical illustration.
Classification of the Extant Hemichordata - List of species, genera and families.
Class Pterobranchia - General information.
Cephalodiscus gracilis - Photos of a colony and individuals.
Animal Diversity - Gives the key anatomical characteristics of members of Phylum Hemichordata, Phylum Chordata and its Subphyla Urochordata, Cephalochordata and Vertebrata. Illustrated by slides.
Hemichordata (Acorn Worms and Pterobranchs) - No description
Chordata introduction - Phylum Hemichordata - A brief introduction to the hemichordates from the Biological Sciences at the University of Paisley.
Cephalodiscus densus Andersson, 1907 (Hemichordata, Graptolithoidea). - Zooid and coenecium morphology of a cephalodiscid pterobranch from Terra Nova Bay, Ross Sea.
Rhabdopleura kozlowskii - Diagnosis, occurrence, images and references of the Jurassic species.

Hemichordata - Hemichordata is a phylum of worm-shaped marine deuterostome animals, generally considered the sister group of the echinoderms. They date back to the Lower or Middle Cambrian and include an important class of fossils called graptolites, most of which became extinct in the Carboniferous.
Pharyngeal slit - Pharyngeal slits, found in both hemichordata and chordata, are used by organisms in feeding. The wall of the pharynx is perforated by up to 200 vertical slits, which are separated by stiffening rods.
Acorn worm - The Acorn worms or Enteropneusta are a hemichordate class of invertebrates. Acorn worms are classified in the phylum Hemichordata, closely related to the chordates.
Pterobranchia - Pterobranchia is a clade of small, worm-shaped animals. They belong to the hemichordata, and live in secreted tubes on the ocean floor.
Comparative vertebrate anatomy - Comparative Vertebrate Anatomy is a comparative study of the anatomical and morphological features of vertebrates. This area of study usually includes the Amphioxus (a Cephalochordate), Sea squirts (a Urochordate), and Balanoglossus), a member of the phylum Hemichordata.