PORT PHILLIP BAY


Red Seaweed 

Rhodoglossum gigartinoides

View scientific description and taxonomy

Scientific Details

May be confused with multiple flat red blade-like algae e.g. Sarcothalia radula which is thicker, lacks a surface sheen when dried, and has its reproductive structures (cystocarps) in small projections off the blades.

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:
Gigartinales
Family:
Gigartinaceae
Genus:
Rhodoglossum
Species:
gigartinoides

General Description

Broad lance to strap-like shaped blades arising from a short slender and compressed stem (stipe). Tapering at tip (apex). Secondary blades can arise from blade edges (margins) as well as stem. Smaller side projections can also occur along blade edges. Blades erect or parallel to substratum (decumbent). Numerous spots/lumps present on surface when reproductive. Holdfast small and disc-like (discoid). Dark red-purple to yellow-brown. Up to 40 cm long (thallus).

Biology

This seaweed has a lustrous sheen when dried.

Habitat

Lower intertidal and shallow subtidal areas, sheltered to moderate waters.

Reefs

Coastal shores

Distribution guide

Mexico, 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

40 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, Rhodoglossum gigartinoides, in Taxonomic Toolkit for marine life of Port Phillip Bay, Museum Victoria, accessed 18 Aug 2017, http://portphillipmarinelife.net.au:8098/species/12336

Text: creative commons cc by licence