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  Beroid comb jelly - Beroe abyssicola
Posted by: Old Tibetan Blue Bear - 03-13-2019, 05:36 PM - Forum: New Animal Profiles - No Replies

BEROID COMB JELLY 

[Image: Beroe_abyssicola_02.jpg]

[img=600x0]https://www.vichighmarine.ca/wp-content/uploads/2017/02/BeroidCombJelly-e1520722728179-600x321.jpg[/img]
Beroid Comb Jelly (Beroe abyssicola)

Author:  Adam Kitzler
Common name: Beroid Comb Jelly
Scientific name: Beroe abyssicola
Size range: up to 7 centimetres

Identifying features


Beroe abyssicola  has a cylindrical shape with rounded ends, they bear eight evenly spaced rows of cilia or “combs” which they beat in waves for locomotion. the comb rows stop just before the oral end where a mouth, resembling a pair of lips, is located. Their most distinguishing characteristics are their translucent, pinkish red colouration through which their more intensely coloured pharynx is visible, as well as their complete lack of tentacles.


Habitat


They inhabit the waters of the North Pacific at an average depth of 1028-1840 metres. They will occasionally come to the surface, however they may lose their pinkish colouring in the process.


Prey


Beroe abyssicola is a carnivorous predator that swims, hunting for prey, with its mouth closed for a more streamlined shape. when it encounters prey, of which it prefers other ctenophores, it can open its mouth to quickly engulf its prey. It can even swallow other ctenophores larger than itself, or bite pieces off with its fused cilia, called macrocilia that line the inside of its mouth and function as simple teeth.


Predators


Not much is known about what exactly preys upon  Beroe abyssicola, but the most likely predators are other ctenophores, jellyfish and other animals like fish and sea turtles.


Life cycle


Beroe abyssicola is a hermaphroditic species, meaning that it has both female and male gonads.  As a result it is thought to be able to occasionally fertilize its own eggs. Regardless it will eject its sperm and/or eggs directly from the mouth into the open water where the eggs are fertilized externally. After fertilization the eggs will go through a larval stage, resembling a smaller adult, that will grow into a full adult. Throughout the life cycle it will remain part of the phytoplankton and is therefore considered holoplanktonic.


Behavior


Beroe abyssicola does not have a very complex nervous system; it has a loose net of nerves spanning its body called a nerve net that may be more concentrated near sensory organs. Because of its simple nerve network it is limited to simple behaviors, such as swimming and navigating for prey, maneuvering away from obstacles and feeding on located prey, which it is able to sense with chemo receptors.
Photographs and Video by Adam Kitzler and D. Young

References


Lachowski. M. Beroe abyssicola, Encyclopedia of life. Retrieved 12-12-11 fromhttp://eol.org/pages/509849/entries/20782331/overview
Lachowski. M. Ctenophora- “comb-jellie”,  Animal Biology: Spring 2010. Retrived 12-12-11 fromhttps://sites.google.com/site/animalbiologyspring2010/ctenophora
Mills, C.E. ( Nov-8-2010) Ctenophores, University of Washingto. Retrived 12-12-11 fromhttp://faculty.washington.edu/cemills/Ctenophores.html
Smith.D, Johnson.K (1996). A guide to marine coastal plankton and marine invertebrate larvvae: Second edition.
Stephen H.D. Haddock (sept-18-2011) Comparative feeding behavior of planktonic ctenophores,Integrative & Comparative Biology. Retrived 12-12-11 fromhttp://icb.oxfordjournals.org/content/47/6/847.full
Wrobel.D. Ctenophores, The Jelies Zone. Retrived 12-12-11 from http://jellieszone.com/ctenophores.htm
Wrobel.D, Mills,C (1993). Pacific coast pelagic invertebrates: A guide to the common gelatenous animals. Monterey, California, Monterey bay aquarium
Wrobel.D, Phylum Ctenophora / Order Beroida / Family Beroidae, The Jellies zone. Retrieved 12-12-11 from http://jellieszone.com/beroe.htm


https://www.vichighmarine.ca/beroidcombjelly/


Extra info:

Quote: Unlike P. bachei, other gooseberry species such as the Beroid Gooseberry (Beroe abbysicola) are aggressive ambush predators that hunt without using tentacles. They primarily eat copepods and krill, but also eat fish eggs, mollusks, small crustaceans, larvae, and even other gooseberries.

https://www.vichighmarine.ca/tag/combjellyfish/

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