Suborder CANCELLINA Gregory, 1896

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Introduction

The name Cancellina is used here in place of Cancellata. This suborder was first defined by Gregory (1896) for the Horneridae, all species of which develop erect branching colonies in which the cryptocystal (i.e. interior) calcification thickens continually during growth. In later ontogeny calcification is longitudinally channelled, or 'cancellate'. Borg (1926) introduced the division Pachystega, effectively a junior synonym of Cancellina. Subsequently (Borg 1944), he further defined the division and described three new families from Antarctic materials. Zooids open on a defined frontal surface. The ancestrular zooid is erect, elongate and unjointed. Embryos are brooded in a gonozooid which expands onto the abfrontal surface of the colony at a dichotomy. Six families were included by Bassler (1953).

General References

Bassler, R.S. 1953. Bryozoa. Treatise on Invertebrate Paleontology, Part G, Moore, R.C., (editor). Lawrence, Kansas : Geological Society of America pp. G1-G253.

Borg, F. 1926. Studies on Recent cyclostomatous Bryozoa. Zoologiska Bidrag Från Uppsala 10: 181-507

Borg, F. 1944. The stenolaematous Bryozoa. Further Zoological Results of the Swedish Antarctic Expedition, 1901-1903 3(5): 1-276

Gregory, J.W. 1896. Catalogue of the fossil Bryozoa in the Department of Geology, British Museum (Natural History). The Jurassic Bryozoa. London : Trustees of the British Museum 239 pp.

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