Ventricaria J.L.& J.A.West, 1988
Holotype species: Ventricaria ventricosa (J.Agardh) J.L.Olsen & J.A.West
Currently accepted name for the type species: Valonia ventricosa J.Agardh
Original publication and holotype designation: Olsen, J.L. & West, J.A. (1988). Ventricaria (Siphonocladales-Cladophorales complex, Chlorophyta), a new genus for Valonia ventricosa. Phycologia 27: 103-108, 14 figs, 3 tables.
Taxonomic status: currently regarded as a synonym of Valonia.
Gender: This genus name is currently treated as feminine.
Description: Thallus composed of a single, unbranched, aseptate vesicular cell, 1-4 (-10) cm diameter. Plants spherical, pyriform, lobed or irregularly deformed depending upon substratum. Cell wall iridescent. Annular constrictions, tenacular cells, and well-developed rhizoid not present. Attachment to substratum achieved by reduced rhizoidal cells at base of cell. Cell division by modified segregative division only. Cells multinucleate; chloroplasts numerous per cell and discoid with single pyrenoid. The sexual life history of Ventricaria has not been conclusively documented although a typical cladophoralean, biphasic, isomorphic alternation of generations similar to Valonia is presumed. Occasionally an adventitious rhizoid cell will expand into a minute new vesicle which detaches to become a new individual. Vegetative propagation of this type in combination with the aplanospore products of segregative division in the entire thallus are common in both cultured and field specimens. Ventricaria is widely distributed throughout the tropics in shallow intertidal habitats, often in coral rubble areas or lodged in coral crevices. It is often found in association with Dictyosphaeria. Ultrastructural studies of the flagellar apparatus support the position of Ventricaria in the Siphonocladales-Cladophorales complex. Ventricaria is one of the largest cells in nature and this makes it an ideal system for studies of cell physiology including electrophysiology and cell growth. The decision to move the former Valonia ventricosa to its own genus, was based on three considerations. First. Ventricaria was found to be immunologically more distant from other Valonia species than from Dictyosphaeria and Siphonocladus which are its closest relatives. Second, cell division in Ventricaria occurs by modified segregative division, while Valonia divides exclusively by the lenticular cell type (exogenous segregative division of Egerod). Third, Ventricaria has a unique and highly reduced habit unlike that found in any Valonia species.
Information kindly contributed by J.L. Olsen but may now be outdated.
Numbers of names and species: There are 2 species names in the database at present.
Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):
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Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.
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.
Created: 28 December 2000 by M.D. Guiry
Verified by: 04 January 2011 by M.D. Guiry
Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=38681
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 24 April 2019.