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
Calvadosia cruxmelitensis Corbin, 1978 - St. John's stalked jellyfish (Stauromedusae)
St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- on eelgrass 1

Specimen above is very typical of the species. Specimen was found on Eelgrass, Zostera marina, at Long Rock, Penzance, Cornwall. 27.11.11.

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- in pool on Chondrus crispus 1

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- in pool on Chondrus crispus 2

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- in pool on Chondrus crispus 3

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- in pool on Chondrus crispus 4

The images above were taken of species on Carragheen (Chondrus crispus), in a lowershore rockpool on an extreme low tide, on the reef in front of Penzance Harbour, Penzance, Cornwall. 21.03.11.

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- with 0.1mm division rule 1

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- close-up of oral region 1

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- base of stalk 1

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- stomach region 1

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- lateral view front of bell 1

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- primary and secondary tentacles and nematocysts 1

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- clear nematocyst 1

Above images are of a young juvenile specimen of approx. 5mm bell length (not oral diameter). Specimen found in a sample of Furbellow holdfast washings from near Sandy Cove, Newlyn, Cornwall. 27.07.17.
N.B. Identification of juvenile from the typically yellowish manubrium (mouth).

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- front view on Chondrus 1

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- side view on Chondrus 1

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- juvenile on Corallina 1

Images above taken of species on Coral Weed (Corallina officinalis) and Carragheen (Chondrus crispus)in a shallow middleshore rockpool next to Albert Pier, Penzance, Cornwall, 14.11.11.

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- Albert Pier Penzance 1

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- Albert Pier Penzance 2

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- Albert Pier Penzance 3

Images above taken of species in a shallow middleshore rockpool close to Albert Pier, Penzance, Cornwall, 17.09.12.

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- secondary tentacles 1

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- white nematocysts 1

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- white nematocysts 2

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- white nematocysts 3

St. John's stalked jellyfish
Calvadosia cruxmelitensis syn. Lucernariopsis cruxmelitensis
- white nematocysts 4

Specimen above was found at Albert Pier, Penzance, Cornwall, 02.03.17. The specimen was found nearly dead so was used to examine the species under a microscope. N.B. White nematocysts look black under a microscope.

Comparison shot with Calvadosia campanulata syn. Lucernariopsis campanulata

See Stauromedusae UK for more information.

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.

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.

Calvadosia cruxmelitensis Lucernariopsis St Johns stalked jellyfish Staurozoa 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.