Ocyropsis

Ocyropsis is a genus of Ctenophores, which are commonly known as Comb Jellies. Ocyropsis belong to the family of Ocyropsidae.[1] Ocyropsis possesses two large lateral muscular lobes and four auricles, and appear pale and translucent in color. Ocyropsis habitat is not precise as their gelatinous composition can make it difficult to study. They have been found in warm and cold waters.[2] Unlike other, slow swimming Ctenophores, Ocyropsis are efficient in evading their predators. They use their oral lobes for additional propulsion and a secrete luminous mucous in efforts to evade predators.[3] The muscular oral lobes of the Ocyropsis are used to grab its prey, and then moved to the prehensile mouth for absorption.[4]

Ocyropsis
Ocyropsis fusca
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Ctenophora
Class: Tentaculata
Order: Lobata
Family: Ocyropsidae
Genus: Ocyropsis
Mayer, 1912
Species

See text.

Distribution
Unknown larval fish swimming around lobes and auricles of Ocyropsis
Pelagic ctenophores — (a) Beroe ovata, (b) unidentified cydippid, (c) "Tortugas Red" cydippid, (d) Bathocyroe fosteri, (e) Mnemiopsis leidyi, and (f) Ocyropsis sp.
Ocyropsis fusca

Habitat

There is lack of knowledge known about Ctenophores habitats. Ocyropsis have been found in both warm and cold waters. They were found and photographed specifically near South Africa near Southern Mozambique to False Bay.[2] There have also been reports of Ocyropsis found near the Madeira Archipelago specifically near Port Santo. The two spotting occurred at 2m- 6m in depth. This sighting at Port Santo, has been the furthest North Atlantic Ocean sighting of an Ocyposis.[5] Typically found in subtropical epielagic water along the Northeastern Pacific. Other sightings have included Southern California, Gulf of Mexico, Western Pacific, and the Indian Ocean.[6]

Movement

Typically Ctenophores are slow swimmers that use cilia based propulsion to swim. Due to their slow movement, it puts them at a disadvantage to predators. Unlike the other Ctenophores, Ocyropsis have an advanced method of propulsion for swimming. They have broad oral lobes, typical used for feeding, that are used to row for extra propulsion. They use their broad oral lobes in addition with ciliary current for locomotion. Ocyropsis swimming speeds have been found to be double top speeds of other gelatinous species. They have  been found to be more successful in invading predators at night than during the day. Once they are startled, they begin to use their jet propulsion and release a luminous mucous that causes confusion to predators as well.[3]

Eating habits

Ocyropsis forage horizontally, and while they eat create a small wake. This wake is created from the intense compression of the organisms body and location of the ctene rows. The muscular oral lobes of the Ocyropsis are used to grab its prey, and then moved to the prehensile mouth for absorption.[4]

Morphology

Ocyropsis shape is noted as looking like two hands together praying, and are pale and translucent in color. The shape consists of two large lateral muscular lobes and 4 auricles varying in size. The lateral lobes extend beyond the mouth no more than about 5 cm. Oftentimes the lobes will be found with pigmented spots of brown or black. The sub-tentacular ctene row is shorter in length than the sub-stomadeal ctene row.[2] Specifically sub-tentacular ctene rows having 25-27 ctene plates compared to sub-stomdeal ctene rows having 35-37 ctene plates.[6] Ctenophores are named after their cilia rows used in movement. A ctene row is enragement of cilia.[7] As Ocryposis age they no longer have their tentacles or have less.[2]

Species include
  • Ocyropsis crystallina (Rang, 1826)
  • Ocyropsis fusca (Rang, 1826)
  • Ocyropsis maculata (Rang, 1826)
  • Ocyropsis pteroessa Bigelow, 1904
  • Ocyropsis vance Gershwin, Zeidler & Davie, 2010

References
  1. "ITIS Standard Report - Error". www.itis.gov. Retrieved 2022-04-12.
  2. Gibbons MJ, Haddock SH, Matsumoto GI, Foster C (2021-01-12). "Records of ctenophores from South Africa". PeerJ. 9: e10697. doi:10.7717/peerj.10697. PMC 7810042. PMID 33520464.
  3. Gemmell BJ, Colin SP, Costello JH, Sutherland KR (March 2019). "A ctenophore (comb jelly) employs vortex rebound dynamics and outperforms other gelatinous swimmers". Royal Society Open Science. 6 (3): 181615. Bibcode:2019RSOS....681615G. doi:10.1098/rsos.181615. PMC 6458386. PMID 31032019.
  4. Matsumoto GI, Harbison GR (1993-10-01). "In situ observations of foraging, feeding, and escape behavior in three orders of oceanic ctenophores: Lobata, Cestida, and Beroida". Marine Biology. 117 (2): 279–287. doi:10.1007/BF00345673. ISSN 1432-1793. S2CID 84057144.
  5. Gueron S (December 2021). "Planktonic Ctenophores of the Madeira Archipelago" (PDF). Zootaxa. 5081 (3): 433–443. doi:10.11646/zootaxa.5081.3.7. PMID 35391000. S2CID 245204900.
  6. Ruiz-Escobar, Fernando; Valadez-Vargas, Diana K.; Oliveira, Otto M. P. (20 March 2015). "Ctenophores from the Oaxaca coast, including a checklist of species from the Pacific coast of Mexico". Zootaxa. 3936 (3): 435–445. doi:10.11646/zootaxa.3936.3.9. PMID 25947447.
  7. "C.E. Mills Homepage". faculty.washington.edu. Retrieved 2022-04-13.
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