ARE CYTOPLASMIC POCKETS (MTR/POCKET) PRESENT IN ALL PHOTOSYNTHETIC EUGLENOID GENERA?1

@article{Shin2002ARECP,
  title={ARE CYTOPLASMIC POCKETS (MTR/POCKET) PRESENT IN ALL PHOTOSYNTHETIC EUGLENOID GENERA?1},
  author={Woongghi Shin and Stacy Brosnan and Richard E. Triemer},
  journal={Journal of Phycology},
  year={2002},
  volume={38}
}
In 1985, the existence of a cytoplasmic pocket formed from the reservoir membrane in the photosynthetic euglenoid Colacium was described. A band of reinforcing microtubules (MTR) derived from the ventral flagellar root lined the pocket, and a dense fibrillar mesh was associated with the membrane. A comparison of bodonid cytostomes, colorless euglenoid cytostomes, and the reservoir pocket found in Colacium suggested that the three structures were homologous and that photosynthetic euglenoids… 

Phylogeny and Classification of Euglenophyceae: A Brief Review

This article summarizes recent advances in the phylogeny and classification of the phototrophic euglenids, aiming at understanding the situation of the group within the phylum Euglenozoa, as well as its evolutionary relationships and the changes in its taxonomic classification.

Ultrastructure of five Euglena species positioned in the subdivision Serpentes

The group is more heterogeneous than expected and that some species have very individual features that poorly fit into a common Serpentes group, particularly the above-mentioned Euglena ehrenbergii.

PHYLOGENY OF PHAGOTROPHIC EUGLENIDS (EUGLENOZOA): A MOLECULAR APPROACH BASED ON CULTURE MATERIAL AND ENVIRONMENTAL SAMPLES 1

Sequence analyses revealed an increasing genetic diversity among euglenid SSU rDNA sequences compared with other well‐known eukaryotic groups, reflecting an equally broad diversity of morphological characters among eUGlenid phagotrophs.

PHYLOGENETIC ANALYSIS OF THE GENUS EUGLENA (EUGLENOPHYCEAE) WITH PARTICULAR REFERENCE TO THE TYPE SPECIES EUGLENA VIRIDIS 1

Molecular phylogenetic analyses using a small subunit (SSU) and a combined SSU–partial large subunit rDNA data set for members of the genus Euglena showed that strains identified as E. viridis on the basis of morphology are distributed between two separate nonsister clades, demonstrating that E. stellata are cryptic species that can only be distinguished at the molecular level.

Morphostasis in a novel eukaryote illuminates the evolutionary transition from phagotrophy to phototrophy: description of Rapaza viridis n. gen. et sp. (Euglenozoa, Euglenida)

The marine mixotrophic mode of nutrition, the preference for green algal prey cells, the structure of the feeding apparatus, and the organization of the pellicle are outstanding examples of morphostasis that clarify pivotal stages in the evolutionary history of this diverse group of microbial eukaryotes.

Ultrastructure of the flagellar apparatus in Rhinomonas reticulata var. atrorosea (Cryptophyceae, Cryptophyta)

Rhinomonas reticulata var. atrorosea G. Novarino is a photosynthetic marine flagellate that is known to have typical characteristics of cryptomonads. We examined the flagellar apparatus of R.

Phylogeny and taxonomic revision of plastid-containing euglenophytes based on SSU rDNA sequence comparisons and synapomorphic signatures in the SSU rRNA secondary structure.

Sequence comparisons and a revised classification of the Euglenophyceae were based on 92 new SSU rDNA sequences obtained from strains of Euglena, Astasia, Phacus, Trachelomonas, Colacium, Cryptoglena, Lepocinclis, EUTreptia, Eutreptiella and TetreutrePTia, and one lineage was recognized as the previously neglected genus Monomorphina Mereschkowsky (1877).

Did trypanosomatid parasites have photosynthetic ancestors?

Towards a molecular phylogeny of the Euglenozoa: analyses of ribosomal DNA sequences and deduced secondary structure elements

Important findings concerning the phylogeny of major euglenozoan groups have been found, i.e. the existence of a eugLenozoa crown group was confirmed by phylogenetic as well as spectral analyses and according to the eponymous autapomorphy, a helically pellicle pattern, prior taxon denominations were converted into Helicales taxon nov.

Macroevolution of complex cytoskeletal systems in euglenids

By possessing combinations of characters resulting from adaptive change and morphostasis, euglenids have retained key pieces of evidence necessary for reconstructing the early evolution and diversification of eukaryotic life.

References

SHOWING 1-10 OF 59 REFERENCES

PHYLOGENETIC RELATIONSHIPS OF SELECTED EUGLENOID GENERA BASED ON MORPHOLOGICAL AND MOLECULAR DATA 1

This study suggests that the hypothetical ancestor to the Euglenozoa was a phagotroph with two flagella, both containing paraxonemal rods, and its basal bodies contained proximal cartwheels, were connected by a prominent fiber, and were anchored with three asymmetrically arranged flagellar roots.

Character evolution in heterotrophic euglenids

A cladistic analysis of a large morphological data set from heterotrophic euglenids found that Dinema sulcatum held a pivotal position in the phylogenetic tree and possessed many characters that bridged bacteriotrophic taxa with eukaryotrophicTaxa.

ULTRASTRUCTURE OF THE BASAL BODY COMPLEX AND PUTATIVE VESTIGIAL FEEDING APPARATUS IN PHACUS PLEURONECTES (EUGLENOPHYCEAE)

The striated fibers in the basal apparatus and associated with the microtubule‐reinforced pocket in P. pleuronectes appear to be similar to those of the phagotrophic euglenoids.

Phylogenetic analysis of phagotrophic, photomorphic and osmotrophic euglenoids by using the nuclear 18S rDNA sequence.

Phylogenetic analyses of 35 strains carried out using the SSU rDNA suggest that neither the Euglenales nor the Eutreptiales form a monophyletic lineage, thus questioning currently available classifications.

ULTRASTRUCTURE OF PHACUS TRYPANON (EUGLENOPHYCEAE) WITH AN EMPHASIS ON STRIATED FIBER AND MICROTUBULE ARRANGEMENT

The striated fiber and MTR/pocket are usually only found in those taxa that have a well‐developed feeding apparatus and lack plastids; therefore, it is speculated that the ingestion apparatus is functional in P. trypanon, which likely diverged in the early history of the photosynthetic green euglenoids.

A Molecular Study of Euglenoid Phylogeny using Small Subunit rDNA

This work has added molecular characters from the Small Subunit (SSU) rDNA to generate an overall phylogenetic framework for the euglenoids, a distinct monophyletic clade with phagotrophic members diverging prior to the phototrophic and osmotrophicMembers.

Flagellar systems in the euglenoid flagellates.

Fine structure of Bodo curvifilus Griessmann (Kinetoplastida: Bodonidae).

Bodo curvifilus Griessmann conforms in its fine structure to the criteria proposed for the genus Bodo, including the presence of subpellicular microtubules, a single large kinetoplast-mitochondrion,

Structural characterization of Eutreptia (Euglenophyta). II, The flagellar root system and putative vestigial cytopharynx

If the number of emergent flagella was reduced from two to one during the evolution of the euglenoids, then the presence of a vestigial cytopharynx, together with flagellar reduction, suggests that the Eutreptiales may have arisen prior to the Euglenales but subsequent to the Heteronematales.
...