Amphiroa Setacea

''Amphiroa'' is a genus of thalloid red algae under the family Corallinaceae.

Taxonomy and nomenclature

Amphiroa was first described by Jean Vincent Félix Lamouroux in 1812 with the type species for the genus being ''Amphiroa tribulus''''.'' This genus was named after Amphiro, a sea nymph in the epic poem of Theogony by the Greek poet Hesiod. There are currently 72 accepted species names for this genus.

Morphology

''Amphiroa'' is composed of an erect thallus that is attached to the substrate with an insconspicous crustose base, and possess mature branches differentiated into alternating areas calcified intergenicula and uncalcified genicula that is composed of more than cell layer and does not exhibit any dimerous flange-like branches. Specimens can reach around 30 cm in size. The thalli take a crustose form; dichotomous branches are formed. The organisms possess secondary pit connections. ''Amphiroa'' reproduces by means of conceptacles; it produces tetraspores. Its pore canals are lined with parallel filaments; the morphology of the pore canal is a key trait used to delineate species within the genus.

Distribution

''Amphiroa'' is a cosmopolitan genus inhabiting the tropics up to the temperate regions.

Ecology

This genus is found from the intertidal down to the subtidal areas of the reef.

Life history

''Amphiroa'' exhibit a triphasic life cycle, however, their tetrasporangia, spermatangia, and carposporangia are borne out of a specialized organ called a conceptacle. This triphasic cycle involves the production of tetraspores (N) from the tetrasporophyte (2N) and the subsequent development of the tetraspores into either the male or female gametophyte (N); the resulting spermatium produced by the male gametophyte is later on trapped by the trichogyne of the female gametophyte leading to their eventual fusion and development of the carposporophyte (2N); the cycle is complete when the carpospores (2N) are released and develops into the next set of tetrasporophytes.

Exploitation, harvesting, and cultivation

''Amphiroa'' species are unpalatable due to its thallus being highly calcified, and thus there is no immediate cultivation and use for the seaweed.

Chemical composition and natural products chemistry

''Amphiroa'' contains several bioactive compounds similar to other seaweeds, for example, the ellagic acid, gallic acid, and phenolic compounds within ''A. anceps'' has shown to be a potential anti-fungal agent, moreover, the addition of ''A. fragilissima'' polysaccharides have shown to improve the gut of farmed shrimp.

Utilization and management

This genus is currently not being utilized and managed on a commercial scale due to a lack of culture technology.

Species

The valid species that are currently considered belonging to this genus are the following:AlgaeBase
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# '' Amphiroa anastomosans'' Weber Bosse
# '' Amphiroa anceps'' (Lamarck) Decaisne
# '' Amphiroa annobonensis'' Pilger
# '' Amphiroa annulata'' Me.Lemoine
# '' Amphiroa articulata'' (Bory) Athanasiadis
# ''Amphiroa beauvoisii'' J.V.Lamouroux
# '' Amphiroa bowerbankii'' Harvey
# '' Amphiroa brasiliana'' Decaisne
# '' Amphiroa breviarticulata'' Areschoug
# '' Amphiroa canaliculata'' G.Martens
# '' Amphiroa capensis'' Areschoug
# ''Amphiroa compressa'' M.Lemoine
# '' Amphiroa crassa'' J.V.Lamouroux
# '' Amphiroa crosslandii'' M.Lemoine
# '' Amphiroa crustiformis'' E.Y.Dawson
# ''Amphiroa cryptarthrodia'' Zanardini
# ''Amphiroa cumingii'' Montagne
# ''Amphiroa currae'' Ganesan
# ''Amphiroa dimorpha'' Me.Lemoine
# ''Amphiroa echigoensis'' Yendo
# ''Amphiroa ephedraea'' (Lamarck) Decaisne
# ''Amphiroa exilis'' Harvey
# ''Amphiroa foliacea'' J.V.Lamouroux
# ''Amphiroa fragilissima'' (Linnaeus) J.V.Lamouroux
# ''Amphiroa franciscana'' W.R.Taylor
# '' Amphiroa galapagensis'' W.R.Taylor
# '' Amphiroa gracilis'' Harvey
# '' Amphiroa hancockii'' W.R.Taylor
# '' Amphiroa howensis'' A.H.S.Lucas
# '' Amphiroa irregularis'' Kützing
# '' Amphiroa itonoi'' Srimanobhas & Masaki
# '' Amphiroa klochkovana'' A.S.Harvey, W.J.Woelkerling & A.J.K.Millar
# '' Amphiroa kuetzingiana'' Trevisan
# '' Amphiroa magdalenensis'' E.Y.Dawson
# '' Amphiroa maletractata'' Simonsen
# '' Amphiroa minutissima'' W.R.Taylor
# '' Amphiroa misakiensis'' Yendo
# '' Amphiroa nodularia'' (Pallas) Decaisne
# ''Amphiroa nodulosa'' Kützing
# '' Amphiroa pacifica'' Kützing
# '' Amphiroa peruana'' Areschoug ex W.R.Taylor
# '' Amphiroa polymorpha'' M.Lemoine
# '' Amphiroa prefragilissima'' Me.Lemoine
# '' Amphiroa pusilla'' Yendo
# '' Amphiroa rigida'' J.V.Lamouroux
# '' Amphiroa rubra'' (Philippi) Woelkerling
# '' Amphiroa setacea'' Kützing
# '' Amphiroa subcylindrica'' E.Y.Dawson
# '' Amphiroa taylorii'' E.Y.Dawson
# ''Amphiroa tribulus'' (J.Ellis & Solander) J.V.Lamouroux - type
# '' Amphiroa ungulata'' Montagne & Millardet
# '' Amphiroa valonioides'' Yendo
# '' Amphiroa vanbosseae'' Me.Lemoine
# '' Amphiroa yendoi'' Børgesen
# '' Amphiroa yendoi'' De Toni

References

External links

Images
of ''Amphiroa'' at Algaebase

Corallinaceae
Red algae genera

{{red alga-stub