Rhipiliopsis A.Gepp & E.S.Gepp, 1911

Holotype species: Rhipiliopsis peltata (J.Agardh) A.Gepp & E.Gepp

Original publication and holotype designation: Gepp, A. & Gepp, E.S. (1911). The Codiaceae of the Siboga Expedition including a monograph of Flabellarieae and Udoteae Siboga-Expeditie Monographie LXII. pp. 1-150, 22 pls. Leiden: E.J. Brill.

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Description: Thallus non-calcified, from less than 5 mm to over 7 cm tall, consisting of blade and stalk system arising from prostrate rhizome or from digitate processes embedded in substratum. Fronds monostromatic or polystromatic, irregularly lanceolate or regularly to excentrically peltate, with siphons dichotomously branched and generally equally constricted above dichotomy. In the 2 species with thickest blades a somewhat differentiated cortex develops on upper and lower surfaces of fronds. Scattered spines occur on blade siphons of two species. Stalks are mono- or multisiphonous; monosiphonous stalks are smooth, or variously covered with spinous processes. Constituent siphons cohere at scattered and isolated points by circular rings of wall thickening at tips of lateral papillae or foreshortened blade-siphon dichotomies. Heteroplastic, except possibly for Johnson-Sea-Linkia, with ovoid chloroplasts and larger reniform amyloplasts. Reproduction is unreported in all but type species which has been illustrated with single ovoid to pyriform, stalked zooidangia borne singly and laterally on medullary siphons.

Information contributed by: J. Kraft. The most recent alteration to this page was made on 2022-02-28 by M.D. Guiry.

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: Lagourgue, L. & Payri, C.E. (2021). Diversity and taxonomic revision of tribes Rhipileae and Rhipiliopsideae (Halimedaceae, Chlorophyta) based on molecular and morphological data. Journal of Phycology 57(5): 1450-1471.

Comments: Geographic distribution predominantly tropical, with most species known only from type and limited ranges. Two species are endemic to temperate coasts of southern Australia. Vertical range is low intertidal to -153 m. It is suggested here that Johnson-Sea-Linkia be placed in synonymy with Rhipiliopsis, at least provisionally. A monotypic genus from the Bahamas, its only known difference is an apparent lack of amyloplasts, a feature conceivably related to its deep-water habitat (ca. -60 to -153 m.)

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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=36028

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 28 February 2022. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 11 August 2022

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