Cryptolepas rhachianecti

Cryptolepas rhachianecti is a species of whale barnacle that lives as a passenger on the skin of gray whales and certain other species of whale in the northern Pacific Ocean.

Cryptolepas rhachianecti
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Subphylum:
Crustacea
Class:
Maxillopoda
Infraclass:
Cirripedia
Order:
Sessilia
Family:
Coronulidae
Genus:
Cryptolepas
Species:
C. rhachianecti
Binomial name
Cryptolepas rhachianecti
Dall, 1872[1]

Description

Cryptolepas rhachianecti can grow to a diameter of 3.8 cm (1.5 in).[2]

Distribution

The species is now only known from the northern Pacific Ocean where gray whales are found. The gray whale was present in the northern Atlantic Ocean between the Late Pleistocene and recent times, and C. rhachianecti fossils have been found on a beach in the Netherlands, showing that the barnacle must also have been present.[3] This barnacle has been found between January and March for several years in captive beluga whales in San Diego Bay, near a route used by migratory gray whales. The barnacles have evoked a skin reaction in the beluga whales resulting in the eviction of the barnacles, which suggests an immune response.[4]

Ecology

This barnacle is exclusively found attached to the skin of whales, almost always to the gray whale (Eschrichtius robustus), but occasionally it has been found on the killer whale (Orcinus orca) and the beluga whale (Delphinapterus leucas).[5] On the gray whale, the barnacles embed themselves deeply in the skin and are mostly clustered on the animal's head and back. Crawling among the barnacles and taking advantage of the protection they provide are several species of ectoparasitic crustaceans known as whale lice, including the gray whale louse Cyamus scammoni and the generalist whale lice Cyamus ceti and Cyamus kessleri. So common are these that an adult gray whale may be carrying several hundred pounds weight of barnacles and lice.[2] Gray whales have been observed rubbing their bodies against pebbly seabeds in an apparent effort to rid themselves of attached organisms.[2]

gollark: The real opposite would be... not interacting with anyone else in any way?
gollark: No, that is not the opposite.
gollark: Something something revealed preferences.
gollark: There's a difference between what people *claim* to care about and what they *actually do* quite often.
gollark: https://en.wikipedia.org/wiki/Halo_effect

References
  1. Van Syoc, Robert (2013). "Cryptolepas rhachianecti Dall, 1872". WoRMS. World Register of Marine Species. Retrieved 27 January 2019.
  2. Busch, R. (1998). Gray Whales: Wandering Giants. Heritage House Publishing Co. pp. 61–62. ISBN 978-1-55143-114-7.
  3. Bosselaers, Mark; Collareta, Alberto (2016). "The whale barnacle Cryptolepas rhachianecti (Cirripedia: Coronulidae), a phoront of the grey whale Eschrichtius robustus (Cetacea: Eschrichtiidae), from a sandy beach in The Netherlands". Zootaxa. 4154 (3): 331–338.
  4. Ridgway, S.H.; Lindner, E.; Mahoney, K.A.; Newman, William (1997). "Gray whale barnacles Cryptolepas rhachianecti infest white whales, Delphinapterus leucas, housed in San Diego Bay". Bulletin of Marine Science. 61: 377–385.
  5. Hayashi, R. (2013). "A checklist of turtle and whale barnacles (Cirripedia: Thoracica: Coronuloidea)". Journal of the Marine Biological Association of the United Kingdom. 93 (1): 149–155. doi:10.1017/S0025315412000847.
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