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A comparison of some morphological characters in Chroomonas ligulata sp. nov. and C. placoidea sp. nov. (Cryptophyceae)
Author(s) -
Novarino Gianfranco,
Lucas Ian A. N.
Publication year - 1993
Publication title -
nordic journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.333
H-Index - 33
eISSN - 1756-1051
pISSN - 0107-055X
DOI - 10.1111/j.1756-1051.1993.tb00102.x
Subject(s) - biology , reticulate , botany , taxonomy (biology) , flagellum , algae , mucilage , bacteria , paleontology
Two species of the cryptomonad genus Chroomonas are described based on two marine strains from the Culture Collection of Algae and Protozoa original, U.K. Chroomonas ligulata sp. nov. is based on strain 978/11, which is listed in the current collection catalogue as corresponding to the original isolate of C. collegionis Butcher; however, a comparison with the description of that species shows that this is a case of misidentification. C. placoidea sp. nov. is based on strain 978/8, which is correctly identified as corresponding to the original isolate of that species. Both species possess an eyespot and apparently lack a periplast raphe at the cell posterior. They can be distinguished from one another based on four characters visible by electron or light microscopy. Chroomonas ligulata has smaller motile cells, larger periplast areas, a ligule in the flagella‐bearing branch of the gullet and lacks large refringent bodies. Chroomonas placoidea has larger motile cells. smaller periplast areas, lacks a ligule in the flagella‐bearing branch of the gullet. and usually possesses 2 large refringent bodies. The latter appear in sections as membrane‐limited bodies containing membrane profiles. Non‐motile palmelloid cells occur in both species. These are covered by a mucilage sheath composed of two reticulate layers of fibrils, a compact one close to the cell surface and a loose one further away from it. The sheath of C. ligulata is thicker than that of C. placoidea. Chroomonas ligulata possesses the rare pigment Cr‐phycocyanin 630. A summary is given of some characters useful for defining species of Chroomonas .