Re-examination ofPyrenomonas andRhodomonas (class cryptophyceae) through ultrastructural survey of red pigmented cryptomonads

  • Mayumi Erata
  • Mitsuo Chihara
Article

Abstract

Several taxa of cryptomonads, including species of marineChroomonas, Cryptomonas and freshwaterRhodomonas were examined using transmission electron microscopy. They have cellular structures fundamentally in common: a single bilobed chlorplast, a single pyrenoid between the chloroplast lobes, and a nuclemorph embedded within a cleft of the pyrenoidal matrix. These features are in accordance with the taxonomic characteristics of the recently established genusPyrenomonas. The algae also have similar pigmentation to that ofRhodomonas andPyrenomonas which is red or reddish-brown. On the basis of these observations, the genusRhodomonas Karsten (1898) is redescribed in this paper and the genusPyrenomonas Santore is considered to be synonymous withRhodomonas.

Key words

Nucleomorph Periplastidal compartment Pyrenomonas Rhodomonas 

Abbreviations for figures

C

chloroplast

CER

chloroplast ER

CV

contractile vacuole

Fg

fibrillogranular body

G

globules

Go

Golgi body

Gu

gullet

M

mitochondrion

N

nucleus

Nm

nucleomorph

Nu

nucleolus

Py

pyrenoid

S

starch

T

large trichocyst

t

small trichocyst

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Copyright information

© The Botanical Society of Japan 1989

Authors and Affiliations

  • Mayumi Erata
    • 1
  • Mitsuo Chihara
    • 1
  1. 1.Institute of Biological SciencesUniversity of TsukubaTsukuba-shi, Ibaraki

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