Cuffey, Roger J. Department of Geology and Geophysics, Pennsylvania State University, University Park, Pennsylvania.
Last reviewed:December 2019
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An order of bryozoans in the class Stenolaemata. Members of the order Cyclostomatida (previously termed Cyclostomata or Tubuliporata) belong to the class Stenolaemata in the phylum Bryozoa. Known commonly as cyclostomes (although not to be confused with the jawless lampreys and hagfishes that are also known as cyclostomes), these bryozoans tend to have delicate colonies composed of relatively isolated, loosely bundled or tightly packed, comparatively simple, long, slender and tubular zooecia (individual living chambers), with thin, highly porous, calcareous walls. When regionated, the colonies display a very gradual transition between rather indistinct endozones and exozones. See also: Bryozoa; Stenolaemata
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