05 | 13

Helminthora divaricata (C.Agardh) J.Agardh

Classification:
Empire Eukaryota
Kingdom Plantae
Phylum Rhodophyta
Subphylum Eurhodophytina
Class Florideophyceae
Subclass Nemaliophycidae
Order Nemaliales
Family Liagoraceae
Genus Helminthora

Pictures

click on thumbnail for larger version.

Finavarra, Co. Clare, Ireland. 14 Jun 2011. M.D. Guiry. © M.D. Guiry (mike.guiry@nuigalway.ie).

Finavarra, Co. Clare, Ireland; lower-shore pools on Polyides rotundus. 11 Aug 2002. Michael Guiry. © Michael Guiry (mike.guiry@nuigalway.ie).

Finavarra, Co. Clare, Ireland; lower-shore pools epiphytic on Polyides rotundus. 11 Aug 2002. Michael Guiry. © Michael Guiry (mike.guiry@nuigalway.ie).

1 2 Next

11 Found - Displaying 1 through 10

Helminthora divaricata (C.Agardh) J.Agardh Finavarra, Co. Clare, Ireland; MLWN lagoon; epiphytic on Polyides rotundus

Publication details
Helminthora divaricata (C.Agardh) J.Agardh 1852: 416

Original publication: Agardh, J.G. (1851). Species genera et ordines algarum, seu descriptiones succinctae specierum, generum et ordinum, quibus algarum regnum constituitur. Volumen secundum: algas florideas complectens. Part 2, fasc. 1. pp. 337 [bis]-351 [bis] 352-506. Lundae [Lund]: C.W.K. Gleerup.
Download PDF

Type species
This is the type species (holotype) of the genus Helminthora.

Status of name
This name is of an entity that is currently accepted taxonomically.

Basionym
Mesogloia divaricata C.Agardh

Origin of species name
Adjective (Latin), divaricate, spreading at a wide angle (Stearn 1973).

Homotypic Synonym(s)
Mesogloia divaricata C.Agardh 1824
Dudresnaya divaricata (C.Agardh) J.Agardh 1851

Heterotypic Synonym(s)
Mesogloia hornemanni Suhr ex Hornemann 1836
Nemalion ramosissimum Zanardini 1847
Chantransia polyidis Rosenvinge 1909
Acrochaetium polyidis (Rosenvinge) Børgesen 1915
Colaconema polyidis (Rosenvinge) Woelkerling 1971

General environment
This is a marine species.

Common names

(as Helminthora divaricata (C.Agardh) J.Agardh)
English: Spreading Worm Weed (Bunker et al. 2010).

Description
Cylindrical, softly gelatinous, pale reddish-brown fronds, 2 mm wide, 200 mm long. Much branched, ultimate branchlets short, irregular, holdfast small, discoid.

Habitat
A summer annual (May or June-September or October), epiphytic on Polyides rotundus in lower tidal pools and in the shallow subtidal, widely distributed on western and south-western coasts, sporadic but often locally abundant, particularly in large, sady pools.

Key characteristics
Association with Polyides rotundus; gelatinous consistency, and profuse, almost pinnate branches.

Similar species
Nemalion helminthoides is broader, deeper red in colour, and does not have as many branches; Nemalion does not occur in pools.

Distribution by country

Point data for Ireland and Britain

This map may take a minute to load. Please use an up-to-date web browser (Google Chrome 11, Firefox 4, Safari 5, Opera 11, Internet Explorer 9) for best performance.

Detailed distribution with sources
(as Dudresnaya divaricata (C.Agardh) J.Agardh)
Ireland: Dublin (Sanders 1860).

Europe: Ireland (Sanders 1860).

(as Helminthora divaricata (C.Agardh) J.Agardh)
Ireland: Antrim (Adams 1907, Guiry 1978, Morton 1994), Clare (Pybus 1977, Guiry 1978, De Valéra et al. 1979), Cork (Cullinane 1971, Guiry 1978), Donegal (Morton 2003), Dublin (Guiry 1978), Galway (Guiry 1978), Mayo (Cotton 1912, Guiry 1978), Wexford (Norton 1970, Guiry 1978).

Europe: Adriatic (Giaccone 1978, Ercegovic 1980), Balearic Islands (Ribera Siguán & Gómez Garreta 1984), Britain (Newton 1931, Dixon & Irvine 1977, Guiry 1987, Hardy & Guiry 2003), Bulgaria (Dimitrova-Konaklieva 1981), France (Feldmann 1954, Dizerbo & Herpe 2007, Le Gall & Saunders 2010, Anon. 2012), Helgoland (Bartsch & Kuhlenkamp 2000), Ireland (Adams 1907, Cotton 1912, Cullinane 1971, Pybus 1977, Guiry 1978, De Valéra et al. 1979, Morton 1994, Guiry 2012), Spain (Gallardo et al. 1985, Pérez-Cirera, Cremades & Bárbara 1989, Pérez-Cirera, Cremades & Bárbara (1989), Pérez-Cirera 2004, Bárbara et al. 2005), Sweden (Kylin 1907, Kylin 1944).

Atlantic Islands: Madeira (Levring 1974).

(as Acrochaetium polyidis (Rosenvinge) Børgesen)
Europe: Sweden (Kylin 1944).

North America: Nova Scotia (Edelstein & McLachlan 1966).

Detailed conservation status with sources
(as Helminthora divaricata (C.Agardh) J.Agardh)
Extinct: (Temnsikova, Stoyneva & Kirjakov 2008)

Taxonomic notes
Guiry (1997) recommends consulting Cunningham, Guiry & Breeman (1993) regarding the synonymy between this species and H. stackhousei.

Key references
Cunningham, E.M., Guiry, M.D. & Breeman, A.M. (1993). Environmental regulation of development, life history and biogeography of Helminthora stackhousei (Rhodophyta) by daylength and temperature. Journal of Experimental Marine Biology and Ecology 171: 1-21.

Le Gall, L. & Saunders, G.W. (2010). Establishment of a DNA-barcode library for the Nemaliales (Rhodophyta) from Canada and France uncovers overlooked diversity in the species Nemalion helminthoides (Velley) Batters. Cryptogamie Algologie 31(4): 403-421.

SAG Cultures
SAG Cultures may be viewed at http://sagdb.uni-goettingen.de/showstrains.php?genus=Helminthora&species=divaricata

SCCAP Cultures
Cultures from the Scandinavian Culture Collection of Algae at the University of Copenhagen (SCCAP) and Protozoa may be viewed at http://www.sccap.dk/search/algaebase.asp?Genus=Helminthora&Species=divaricata

NCBI Nucleotide Sequences

Created: 30 March 1996 by M.D. Guiry

Verified by: 29 May 2012 by Michael Guiry

Accesses: This record has been accessed by users 2379 times since it was created.

References
(Please note: only references with the binomials in the title are included. The information is from the Literature database.)

Cremades, J. & Pérez-Cirera, J.L. (1990). Fucus stackhouse Clemente, nombre prioritario para Helminthora divaricata (C. Agardh) J. Agardh (Helminthocladiaceae, Rhodophyta). Anal. Jardin Bot. Madrid 47(1): 232-233.
Pérez-Cirera, J.L., J. Cremades & I. Bárbara (1989). Griffithsia opuntioides J.Ag. y Helminthora divaricata (C.Ag.) J.Ag., dos nuevos rodófitos para el Noroeste Peninsular. . Anales Jardín Botánico de Madrid 45(2): 547-549.

Linking to this page: http://www.algaebase.org/search/species/detail/?species_id=23

Citing AlgaeBase
Cite this record as:
Michael Guiry in Guiry, M.D. & Guiry, G.M. 2013. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 23 May 2013.

Algaebase taxon LSID: urn:lsid:algaebase.org:taxname:77490

Website Design : 249 Design Studio