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
Okenia aspersa (Alder & Hancock, 1845) - A Sea slug (Sea slug images)
Sea slug
Okenia aspersa
- dorsal view 1

Sea slug
Okenia aspersa
- lateral view 1

Sea slug
Okenia aspersa
- close-up of its food, Molgula sp., from a submerged overhang at the same site 1

Sea slug
Okenia aspersa
- general habitat / location 1

Specimen found on stone washing in a large pool near the waterline on an extra low water spring tide at Albert Pier reef, Penzance, Cornwall, 09.05.20. The likely habitat this species frequents at this site is submerged overhangs and crevices with Molgula species of tunicates / sea squirts. The habitat is only accessible on the lowest tides.

Sea slug
Okenia aspersa
- 2.0mm juvenile 1

Sea slug
Okenia aspersa
- 2.0mm juvenile 2

Sea slug
Okenia aspersa
- 2.0mm juvenile 3

Sea slug
Okenia aspersa
- 2.0mm juvenile 4

Sea slug
Okenia aspersa
- with 0.1mm division rule 1

Sea slug
Okenia aspersa
- on rock 1

Sea slug
Okenia aspersa
- sample site 1

Sea slug
Okenia aspersa
- sample site 2

Specimens above found in a sample of Coral Weed, Corallina officinalis, collected from a large middleshore pool at Battery Rocks, Penzance, Cornwall. 17.06.16.

Okenia aspersa is not a common species in Cornwall, nor is it usually found in intertidal pools, so it's rather an odd find. The nearest record of the species is at St. Ives, a record by Vallentin, who found a specimen between 1903 and 1906.

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.

Okenia aspersa sea slug 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.