Overview

Brief Summary

Introduction

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Comprehensive Description

Characteristics

  • Nucleomorph embedded in pyrenoid matrix, separated from pyrenoid by two inner plastid membranes
  • Type of biliprotein: PE545
  • Probably dimorphic
  • Light microscopy: red to bright brown cryptophytes, predominantly marine, one bi-lobed plastid with a pyrenoid on the connecting bridge between the plastid lobes
  • Ultrastructure of Rhodomonas: approx. rectangular periplast plates (IPC) and fibrils (SPC), combination of gullet and furrow, keeled rhizostyle (revised by Hill and Wetherbee 1989)
  • Ultrastructure of Rhinomonas: hexagonal periplast plates, gullet.
  • Ultrastructure of Storeatula: sheet-like IPC, SPC made of coarse fibrils, gullet, keeled rhizostyle
  • Predominantly marine, only few freshwater species

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Description of Rhodomonas

Cryptomonad flagellates, cells with a variable furrow and a short tubular gullet. Periplast consisting of inner, more or less, square plates which taper slightly toward the anterior and a surface component of intertwining fibrils. The periplastidial compartment usually has a single, bilobed chloroplast with a pyrenoid situated between the two lobes of the chloroplast. Thylakoids do not traverse the pyrenoid. Nucleomorph located in an evagination of the periplastidal cytoplasm into the pyrenoid. Cells not necessarily coloured red; chloroplasts contain Cr-phyco-erythrin 545. Marine and freshwater
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biopedia

Source: BioPedia

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Distribution

  • M'harzi, A. (1999). Phytoplankton community structuring in some areas of the North Sea. PhD Thesis. Vrije Universiteit Brussel: Brussel, Belgium. 221 pp.
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© WoRMS for SMEBD

Source: World Register of Marine Species

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Ecology

Habitat

Depth range based on 281 specimens in 6 taxa.
Water temperature and chemistry ranges based on 104 samples.

Environmental ranges
  Depth range (m): 0 - 270
  Temperature range (°C): -1.938 - 4.949
  Nitrate (umol/L): 1.219 - 5.991
  Salinity (PPS): 26.680 - 34.953
  Oxygen (ml/l): 7.112 - 8.671
  Phosphate (umol/l): 0.071 - 1.107
  Silicate (umol/l): 1.193 - 12.303

Graphical representation

Depth range (m): 0 - 270

Temperature range (°C): -1.938 - 4.949

Nitrate (umol/L): 1.219 - 5.991

Salinity (PPS): 26.680 - 34.953

Oxygen (ml/l): 7.112 - 8.671

Phosphate (umol/l): 0.071 - 1.107

Silicate (umol/l): 1.193 - 12.303
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Evolution and Systematics

Evolution

Discussion of Phylogenetic Relationships

A mixture of genera with different periplast types across the tree provides evidence for dimorphism in this cryptophyte group (Figure 1; Marin et al. 1998; Deane et al. 2002; Hoef-Emden et al. 2002). This is most obvious from existence of two Rhinomonas strains and Storeatula major that have almost identical DNA sequences. Therefore, this genus complex requires revision to eliminate inconsistencies.


Figure 1. Molecular phylogeny of the Rhodomonas/Rhinomonas/Storeatula genus complex. Maximum likelihood tree inferred from nuclear SSU rDNA sequences. Scale bar = substitutions per site. © 2008 Kerstin Hoef-Emden

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Wikipedia

Rhodomonas

Rhodomonas is a genus of algae.[1][2]

It includes the species Rhodomonas salina.[3]

References[edit]


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