Sea Walnut Mnemiopsis leidyi    Synonyms: Common Comb Jelly.
Kingdom Animalia   >   Phylum Ctenophora   >   Class Tentaculata   >   Order Lobata   >   Family Bolinopsidae   >   Genus Mnemiopsis   

Status:

The Sea Walnut (Mnemiopsis leidyi) is a comb jelly, a distinct order of living things at the same taxonomic level as jellyfish. They are found year-round in the lower and middle Chesapeake Bay, but are most common in spring and fall. They tend to be found near the surface of the water, and are more common than Sea Nettles and our other true jellyfish.

Relationships:

They feed on microorganisms by constantly pumping water through their bodies. The closely related Pink Comb Jelly is a major predator of this species.

There are 20 records in the project database.

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A Sea Walnut found in the Rhode River in Anne Arundel Co., Maryland (8/14/2014). Measured 37 mm. Photo by Robert Aguilar, SERC. (MBP list)

Sea Walnut in Kent Co., Maryland (1/10/2015). (c) 116916927065934112165, some rights reserved (CC BY-SA). Photo by Matt Muir via iNaturalist. (MBP list)

Sea Walnut in Talbot Co., Maryland (2/24/2013). (c) 116916927065934112165, some rights reserved (CC BY-SA). Photo by Matt Muir via iNaturalist. (MBP list)

Sea Walnut in Worcester Co., Maryland (8/9/2021). (c) Haley Beck, some rights reserved (CC BY-NC). Photo by Haley Beck via iNaturalist. (MBP list)

Sea Walnuts washed up on the beach at Fort Smallwood, Maryland (1/5/2013). Sea Walnuts are comb jellies, which although similar to jellyfish are actually in their own order. Photo by Bill Hubick. (MBP list)

Sea Walnut in Baltimore City, Maryland (4/27/2020). (c) ejschott, some rights reserved (CC BY-NC). Photo by ejschott via iNaturalist. (MBP list)

Sea Walnut in Anne Arundel Co., Maryland (9/24/2019). (c) Sean Sipple, all rights reserved. Photo by Sean Sipple via iNaturalist. (MBP list)

Sea Walnut in Anne Arundel Co., Maryland (4/19/2020). (c) Sydney, some rights reserved (CC BY-NC). Photo by Sydney via iNaturalist. (MBP list)

Sea Walnut in Baltimore Co., Maryland (4/27/2020). (c) Nick Long, some rights reserved (CC BY-NC). Photo by Nick Long via iNaturalist. (MBP list)

Sea Walnut in Worcester Co., Maryland (8/11/2021). (c) cybzilla, some rights reserved (CC BY-NC). Photo by cybzilla via iNaturalist. (MBP list)

Sea Walnut in Worcester Co., Maryland (8/11/2021). (c) cybzilla, some rights reserved (CC BY-NC). Photo by cybzilla via iNaturalist. (MBP list)


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