Isognomon bicolor - Bicolor purse-oyster (Marine bivalve images)

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

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.

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.

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.