PORT PHILLIP BAY


Brown Seaweed 

Sirophysalis trinodis

View scientific description and taxonomy

Scientific Details

Can be confused with Caulocystis cephalornithos which has longer branchlets, and round or oval floats occurring directly on the main stem (axis). The floats on Sirophysalis trinodis are formed within the branchlets.

Main information sources:
Womersley, H.B.S., (1984-2003). The Marine Benthic Flora of Southern Australia. Part 1-3d. Govt. Printer, South Australia.
Baldock, R.N. 2010. Algae Revealed. South Australian State Herbarium. Website.
AlgaeBase. Website.

Taxonomy

Phylum:
Ochrophyta
Subphylum:
Phaeista
Superclass:
Fucistia
Class:
Phaeophyceae
Order:
Fucales
Family:
Sargassaceae
Genus:
Sirophysalis
Species:
trinodis

General Description

Multiple radial branches at base giving rise to several long primary branches. Branchlets (ramuli) are thin, short and can be cylindrical (terete), simple, branched or leaf-like in shape. Lower primary branches are denuded with short spines (muricate). Single or chain-like floats (vesicles) occur within branchlets and are either egg (ovoid) or spindle (fusiform) in shape. Medium brown. Up to 60 cm long (thallus).

Biology

The tropical form of this species is more "leafy" than the southern form which is usually only leafy at the base.

Habitat

Tidal pools, shallow subtidal areas, sheltered coasts, to depth of 1 m.

Reefs

Coastal shores

Distribution guide

Indian Ocean and Australia.

Species Group

Seaweeds and seagrasses Brown algae

Depth

Shore (0-1 m)

Water Column

On or near sea floor

Max Size

60 cm

Diet

Photosynthetic - sunlight

Commercial Species

No

Global Dispersal

Recorded in Australia

Identify

Conservation Status

  • DSE Advisory List : Not listed
  • EPBC Act 1999 : Not listed
  • IUCN Red List : Not listed

Author

article author Pocklington, Jacqui

Jacqui Pocklington is a Research Associate with expertise in algal taxonomy.

citation

Cite this page as:
Pocklington, Jacqui, 2011, Brown Seaweed, Sirophysalis trinodis, in Taxonomic Toolkit for marine life of Port Phillip Bay, Museum Victoria, accessed 23 Aug 2017, http://portphillipmarinelife.net.au:8098/species/12345

Text: creative commons cc by licence