Cephalodiscus+densus


 * Phyla:** Hemichordata


 * Class:** Pterobranchia


 * Scientific Name:** //Cephalodiscus desus//


 * Common Name:** pterobranch


 * Location:** Antarctic ocean


 * Size:** about 3mm


 * Habitat:** ocean water; depths of 75-1280m


 * Living Requirements:** deep waters of the Antarctic


 * Life Cycle:** sexual reproduction; spawn between June and July


 * Male and Female Differences:** none other than sex organs


 * Facts:**
 * Live in colonies
 * Are closely related to acorn worms
 * Closely resemble the extinct class of pterobranchs: Graptolithina (graptolites)



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