PORT PHILLIP BAY


Red Seaweed 

Gracilaria secundata

View scientific description and taxonomy

Scientific Details

Can be hard to distinguish from Gracilaria cliftonii which has regular branching dividing equally in two, and Gracilaria harveyana which is thicker and lacks regular closely spaced branching.

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:
Rhodophyta
Subphylum:
Eurhodophytina
Class:
Florideophyceae
Subclass:
Rhodymeniophycidae
Order:
Gracilariales
Family:
Gracilariaceae
Genus:
Gracilaria
Species:
secundata

General Description

Thickened (robust) form. Secondary branching which is often restricted to one side and is irregular. Tips becoming slender almost to a point. Medium to dark red fading to yellow. Up to 30 cm long (thallus).

Biology

Some species in this family (Gracilariaceae) are very important commercially as they provide most of the world's agar. They can withstand being covered by sand for extended periods.

Habitat

Tidal pools, subtidal areas, estuaries, on open coasts, to depth of 13 m.

Reefs

Coastal shores

Soft substrates

Distribution guide

New Zealand and Australia.

Species Group

Seaweeds and seagrasses Red algae

Depth

Shore (0-1 m)
Shallow (1-30 m)

Water Column

On or near sea floor

Max Size

30 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, Red Seaweed, Gracilaria secundata, in Taxonomic Toolkit for marine life of Port Phillip Bay, Museum Victoria, accessed 30 May 2017, http://portphillipmarinelife.net.au:8098/species/11332

Text: creative commons cc by licence