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Descriptions of Two New Marine Species of the Sand-Dwelling Testacean Genus Corythionella: C. gwaii sp. n. and C. rachelcarsoni sp. n., and a Revised Description of C. acolla Gol. (Rhizopoda: Filosea, or Rhizaria: Cercozoa)
並列摘要
Three species of the filose testate amoeboid genus Corythionella co-existing in subsurface samples of beach sand interstitial seawater were discovered in the summer of 2006 near Sandspit, Haida Gwai (Queen Charlotte Islands, British Columbia, Canada). One of these was assigned to C. acolla Golemansky, after the specific circumscription of this taxon was revised to exclude smaller forms and forms with distinctively different test morphology that have been previously published under this binomen. The other two morphotypes were assigned to two new species, C. gwaii n. sp. and C. rachelcarsoni n. sp., owing to their consistent and statistically well-defined sizes and shapes. C. gwaii is characterized by a pronounced concavity of the ventral surface of its test and an elliptical pseudostomal aperture that is wider than long. C. rachelcarsoni is characterized by a test that is about one-half the size of C. gwaii and C. acolla and further differs from them by virtue of its relatively longer ”neck” region associated with its minimally flared collar surrounding a pseudostomal aperture that is significantly larger (relative to test width) than in C. acolla. Also, the scales covering the test are significantly smaller than those in C. acolla. Scales of C. gwaii and C. rachelcarsoni apparently lack the marginal rim and median ridge found in scales of C. acolla emend.
延伸閱讀
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