Glass octopus: Difference between revisions

Glass octopus
	Ventral view of female
Conservation status
	; Least Concern (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Order:	Octopoda
Family:	Amphitretidae
Genus:	Vitreledonella; Joubin, 1918
Species:	V. richardi
Binomial name
	Vitreledonella richardi; Joubin, 1918
SynonymsWoRMS/>
	Vitreledonella ingeborgae Joubin, 1929; Vitreledonella translucida Robson, 1930;

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Vitreledonella richardi, also known as the glass octopus, is an incirrate octopus. It is in the genus Vitreledonella and of the family Amphitretidae.

Description

Vitreledonella richardi is a transparent, gelatinous, and almost colorless meso- to bathypelagic octopod found worldwide in tropical and subtropical seas with a mantle length up to 11 cm (4.3 in) and a total length up to 45 cm (18 in) in adults. The upper three pairs of arms are subequal in length; in juveniles about as long as the mantle, in adults two to three times mantle length. The fourth, ventral pair is slightly shorter. Suckers are small, widely separated, and in a single series. In males, the left arm III is hectocotylized, with a spherical vesicle near the tip, but is not detachable. The large ampulla and the elongate accessory gland lie out among the internal reproductive organs, notable among mature males alongside its reproductive anatomical counterparts.^[3] Its eyes are rectangular, as seen from the side. In accordance to its eyes; Two Vitreledonella richardi specimens obtained at 200 m in the North Atlantic were used to characterize the elongated eye. It is demonstrated that the cylindrical design, with the lens centered, results in a restricted horizontal field of vision. The unique morphology is thought to be an adaptation that reduces the eye's silhouette when viewed from below, and is part of the animal's camouflage technique^[4].The radula is heterodont, also known as heteroglossan, in which the middle or rhachidian tooth in each array has multiple cusps and the lateral teeth are unicuspid.

Vitreledonella richardi is ovoviviparous. The female broods her eggs, of which hundreds are within the mantle cavity. Each egg measures about 4 mm (0.16 in) in length. Newborn larvae have a mantle length around 2.2 mm (0.087 in). The mother's purpose is to reproduce, so the female grows weak during reproduction and quickly passes away after giving birth. The young paralarvae are left to fend for themselves as the mother quickly passes away after their birth. [1]

Researchers in Central Marine Fishieries Research Institute, conducted an experiment that later concluded young paralarvae beaks to change as they get older, along with the depth of water in which they want to live in. Younger paralarvae have stronger beaks to tear prey's flesh off since that was all they ate. Once they got older, they lose that beak and form a faint less developed one to eat softer bodied prey. With their diet changing, they are predicted to move up from deeper levels (between 310 and 440, but can be as far as 1000m) to the subsurface (between 110 and 300m) as they get older.

Ecology

Found mostly in the tropic and subtropic regions of seas worldwide, the Glass Octopus is prey to the feeding ecology of Northern Bottlenose whales. More specifically noted is that of Tåsinge whale.^[5]

References

^ Allcock, L. (2014). "Vitreledonella richardi". IUCN Red List of Threatened Species. 2014: e.T162988A961420. doi:10.2305/IUCN.UK.2014-3.RLTS.T162988A961420.en. Retrieved 19 November 2021.
^ Philippe Bouchet (2013). "Vitreledonella richardi Joubin, 1918". World Register of Marine Species. Flanders Marine Institute. Retrieved 3 February 2018.
^ Voight, J. R. (1996). Male reproductive anatomy of Vitreledonella (Cephalopoda: Octopoda). American Malacological Bulletin, 13(1-2), 61-64.
^ Land, M. (1992). A note on the elongated eye of the octopus Vitreledonella richardi. Journal of the Marine Biological Association of the United Kingdom, 72(1), 89-92. doi:10.1017/S0025315400048803
^ Santos, M., Pierce, G., Smeenk, C., Addink, M., Kinze, C., Tougaard, S., & Herman, J. (2001). Stomach contents of northern bottlenose whales Hyperoodon ampullatus stranded in the North Sea. Journal of the Marine Biological Association of the United Kingdom, 81(1), 143-150. doi:10.1017/S0025315401003484

Ulanova, E (June 21, 2018). "Vitreledonella richardi (glass octopus)" (PDF). Academia.
Sajikumar, K. K., Venkatesan, V., Jeyabaskaran, R., Muhammed, A., & Mohamed, K. S. (2016). First record of the glass octopus Vitreledonella richardi (Cephalopoda: Vitreledonellidae) from the Arabian Sea. Marine Biodiversity Records, 9, 1–4. doi:10.1186/s41200-016-0041-6

External links

This article related to the octopus is a stub. You can help Wikipedia by expanding it.

[iucn_status_19_November_2021-1] Allcock, L. (2014). "Vitreledonella richardi". IUCN Red List of Threatened Species. 2014: e.T162988A961420. doi:10.2305/IUCN.UK.2014-3.RLTS.T162988A961420.en. Retrieved 19 November 2021.

[WoRMS-2] Philippe Bouchet (2013). "Vitreledonella richardi Joubin, 1918". World Register of Marine Species. Flanders Marine Institute. Retrieved 3 February 2018.

[3] Voight, J. R. (1996). Male reproductive anatomy of Vitreledonella (Cephalopoda: Octopoda). American Malacological Bulletin, 13(1-2), 61-64.

[4] Land, M. (1992). A note on the elongated eye of the octopus Vitreledonella richardi. Journal of the Marine Biological Association of the United Kingdom, 72(1), 89-92. doi:10.1017/S0025315400048803

[5] Santos, M., Pierce, G., Smeenk, C., Addink, M., Kinze, C., Tougaard, S., & Herman, J. (2001). Stomach contents of northern bottlenose whales Hyperoodon ampullatus stranded in the North Sea. Journal of the Marine Biological Association of the United Kingdom, 81(1), 143-150. doi:10.1017/S0025315401003484

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 == Ecology ==
-Found mostly in the tropic and subtropic regions of seas worldwide, the Glass Octopus is [[Predation|prey]] to the feeding ecology of Northern [[Bottlenose whale|Bottlenose whales]]. More specifically noted is that of Tåsinge whale.<ref>Santos, M., Pierce, G., Smeenk, C., Addink, M., Kinze, C., Tougaard, S., & Herman, J. (2001). Stomach contents of northern bottlenose whales Hyperoodon ampullatus stranded in the North Sea. ''Journal of the Marine Biological Association of the United Kingdom,'' ''81''(1), 143-150. doi:10.1017/S0025315401003484</ref>
+Found mostly in the tropic and subtropic regions of seas worldwide, the Glass Octopus is [[Predation|prey]] to the feeding ecology of Northern [[Bottlenose whale|Bottlenose whales]]. More specifically noted is that of Tåsinge whale.<ref>Santos, M., Pierce, G., Smeenk, C., Addink, M., Kinze, C., Tougaard, S., & Herman, J. (2001). Stomach contents of northern bottlenose whales Hyperoodon ampullatus stranded in the North Sea. ''Journal of the Marine Biological Association of the United Kingdom,'' ''81''(1), 143-150. {{doi|10.1017/S0025315401003484}}</ref>
 ==References==
 {{Reflist}}
 * {{Cite journal |last=Ulanova |first=E |date=June 21, 2018 |title=Vitreledonella richardi (glass octopus) |url=https://d1wqtxts1xzle7.cloudfront.net/64673981/Vitreledonella%20richardi%20(glass%20octopus)%20-%202020%20edited%20paper.docx%20(2)-with-cover-page-v2.pdf?Expires=1647300595&Signature=IfHsiV~L9-MGQRvBMhoirS~-rwiZ1sEsy-j1spCmaH~xj0DWKTxjYVzyWDCixLLPoQu6B0CC |journal=Academia}}
-* Sajikumar, K. K., Venkatesan, V., Jeyabaskaran, R., Muhammed, A., & Mohamed, K. S. (2016). First record of the glass octopus Vitreledonella richardi (Cephalopoda: Vitreledonellidae) from the Arabian Sea. Marine Biodiversity Records, 9, 1–4. {{doi|0.1186/s41200-016-0041-6}}
+* Sajikumar, K. K., Venkatesan, V., Jeyabaskaran, R., Muhammed, A., & Mohamed, K. S. (2016). First record of the glass octopus Vitreledonella richardi (Cephalopoda: Vitreledonellidae) from the Arabian Sea. Marine Biodiversity Records, 9, 1–4. {{doi|10.1186/s41200-016-0041-6}}
 ==External links==