APHOTOMARINE

An educational resource dedicated mainly to the photography
and diversity of marine life that can be found in coastal waters
and intertidal areas of Great Britain and Ireland by David Fenwick.

A-P-H-O-T-O Wildlife Stock Image Library
Isognomon bicolor (C. B. Adams, 1845) - Bicolor purse-oyster - a non-native species (Marine bivalve images)
Bicolor purse-oyster
Isognomon bicolor
- pale specimen 1

Bicolor purse-oyster
Isognomon bicolor
- dark specimen 1

Bicolor purse-oyster
Isognomon bicolor
- man-overboard marker buoy 1

A non-native species, specimens above were found in a crevice found on a Man-overboard marker buoy that was washed-up at Gwithian, near Hayle, Cornwall, 11.02.16. Eight Columbus crabs, Planes minutus, the barnacle Lepas ansifera, the medusa polyps of Linuche unguiculata, two Scorched mussels and two live juvenile Florida rock snails were also found on the buoy.

Bicolor purse-oyster
Isognomon bicolor
- large specimens 1

Bicolor purse-oyster
Isognomon bicolor
- flotsam 1

Specimens above were found on a piece of plastic flotsam washed-up at Par Beach, near St. Austell, Cornwall, 31.01.16. There growth has been limited because of this size and shape of the flotsam on which they've been growing. One Isognomon radiatus, one Anomia simplex and one Ostrea equestris were found on the same item of flotsam.

Bicolor purse-oyster
Isognomon bicolor
- exterior 1

Bicolor purse-oyster
Isognomon bicolor
- interior 1

Specimen above found under the lid of a pail that had drifted across the Atlantic and washed-up at Marazion, Cornwall. 30.12.15. Images taken of this non-native species on the 19.01.16. The valve hinge is typical for Isognomon.

Bicolor purse-oyster
Isognomon bicolor
- exterior of valve 1

Bicolor purse-oyster
Isognomon bicolor
- exterior of valve 2

Bicolor purse-oyster
Isognomon bicolor
- exterior of valve 3

Bicolor purse-oyster
Isognomon bicolor
- valves from above 1

Bicolor purse-oyster
Isognomon bicolor
- hinge seen between valves 1

Bicolor purse-oyster
Isognomon bicolor
- in crevice on crab trap 1

A non-native species, one complete shell was found in a small crevice on a Stone crab trap that had drifted from Florida, USA to the Lesceave end of Praa Sands, near Helston, Cornwall. SW 58522 27590. 10.11.15.

Species kindly verified by Anna Holmes of the National Museum of Wales.

Chama congregata, the Corrugated jewel box clam was also found on the same stone crab trap.

Bicolor Purse-oyster
Isognomon bicolor
- shell 1

Bicolor Purse-oyster
Isognomon bicolor
- shell in-situ on plastic 1

Bicolor Purse-oyster
Isognomon bicolor
- shell in-situ on plastic 2

Specimen above found on plastic flotsam at Praa Sands, near Helston, Cornwall. 02.12.15.

Bicolor Purse-oyster
Isognomon bicolor
- white coloured form 1

Bicolor Purse-oyster
Isognomon bicolor
- white coloured form 2

Bicolor Purse-oyster
Isognomon bicolor
- purple coloured form 1

Bicolor Purse-oyster
Isognomon bicolor
- purple coloured form 2

Bicolor Purse-oyster
Isognomon bicolor
- yellow coloured form 1

Bicolor Purse-oyster
Isognomon bicolor
- collection of shells 1

Bicolor Purse-oyster
Isognomon bicolor
- shell in rim of drum lid 1

Bicolor Purse-oyster
Isognomon bicolor
- plastic drum lid 1

Bicolor Purse-oyster
Isognomon bicolor
- door of stone crab trap 1

17 specimens found between the seal and rim of a black plastic drum lid. 15 specimens found in the trap door of a plastic Stone crab trap. The objects were found amongst a pile of plastic refuse that was collected from the strandline by beach cleaners at Par Beach, Par, near St. Austell, Cornwall. 20.12.15.

This species is regarded a non-native invasive species in Brazil. At the present time waters appear to cold for it to survive in the UK.

APHOTOMARINE supports open source data recording and sharing for the benefit of wildlife, recorders, research, science and education. The project recommends the following websites and works with the following bodies and organisations.

Conchological Society of Great Britain and Ireland

The Conchological Society of Great Britain and Ireland
Helping to understand, identify, record, and conserve molluscs.

Marine Biological Association MBA

The Marine Biological Association or MBA, based in Plymouth, is one of the world’s longest-running societies dedicated to promoting research into our oceans and the life they support. Since 1884 the MBA has been providing a unified, clear, independent voice on behalf of the marine biological community.It has a growing membership in over 40 countries.

NBN National Biodiversity Network

The National Biodiversity Network or NBN is a charity that supports open source data sharing and recording supporting conservation, science and education. "Why do recorders need open source?". Simply because it supports the core values of wildlife recording and the free use of records and data over a very wide network that includes partners like the Natural History Museum.

The taxonomy used here is based on that of the following database, which is also used by the MBA, NHM and the NBN.

World Register of Marine Species or WoRMS

The World Register of Marine Species or WoRMS.

Isognomon bicolor Purse oyster Marine Bivalve Images
The main objective of this website is in furthering environmental awareness and education through the medium of photography. To increase awareness and access to the wildlife of the region and help
people find and identify it. Sometimes the difference between species is obvious but many species can only be determined by observing microscopic characteristics that are specific to any one species.