Derepyxis A.Stokes, 1885
Lectotype species: Derepyxis amphora A.Stokes
Original publication: Stokes, A.C. (1885). Notes on some apparently undescribed forms of fresh-water infusoria, No. 2. American Journal of Science 129(172): 313-328, plate 3.
Request PDFType designated in: Bourrelly, P. (1957). Recherches sur les Chrysophycées. Morphologie, phylogénie, systématique. Mémoire Hors-Série Revue Algologique 1: [1]-412, incl. 11 pls.
Description: Cells solitary, rhizopodial, surrounded by a tubular, flask- or vase-shaped lorica that is normally attached to a substratum by a short gelatinous stipe; distal end of lorica with an opening through which rhizopodia emerge. Vegetative cells with 1-2 chloroplasts, no stigma, 1-2 contractile vacuoles, and with simple or branched rhizopodia rather than with 2 equal flagella as reported by several authors. Rhizopodia are capable of capturing bacteria, which are encapsulated within food vacuoles and translocated to the main cell body where digestion occurs. Cell division produces 2 daughter cells, one usually remains in lorica while the other escapes through the lorica opening. The migrating cell may become an amoeboid aplanospore or differentiates into a zoospore which has a single emergent anterior flagellum (a minute second flagellum may occur but is hardly visible by light microscopy). Zoospores dedifferentiate into amoeboid cells upon contact with a substratum. Development of lorica occurs in distinct phases, beginning with attachment of aplanospore or zoospore, through stipe formation and finally lorica wall deposition. Stomatocysts are produced within amoeboid aplanospores or dedifferentiated zoospores.
Information contributed by: H.R. Preisig. The most recent alteration to this page was made on 2023-06-24 by E.A. Molinari Novoa.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
Gender: This genus name is currently treated as feminine.
Most recent taxonomic treatment adopted: Kawai, H. & Nakayama, T. (2015). Introduction (Heterokontobionta p.p.), Cryptophyta, Dinophyta, Haptophyta, Heterokontophyta (except Coscinodiscophyceae, Mediophyceae, Fragilariophyceae, Bacillariophyceae, Phaeophyceae, Eustigmatophyceae), Chlorarachniophyta, Euglenophyta. In: Syllabus of plant families. Adolf Engler's Syllabus der Pflanzenfamilien. Ed. 13. Phototrophic eukaryotic Algae. Glaucocystophyta, Cryptophyta, Dinophyta/Dinozoa, Haptophyta, Heterokontophyta/Ochrophyta, Chlorarachnniophyta/Cercozoa, Chlorophyta, Streptophyta p.p. (Frey, W. Eds), pp. 11-64, 103-139. Stuttgart: Borntraeger Science Publishers.
Comments: Species of the genus occur in freshwater, often epiphytic on filamentous algae.
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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera,
organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA)
and intended to be published in CD format.
These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above.
The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.
Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.
Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=44732
Citing AlgaeBase
Cite this record as:
E.A. Molinari Novoa in Guiry, M.D. & Guiry, G.M. 24 June 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 04 May 2024
