Larger Pacific striped octopus

The larger Pacific striped octopus (LPSO), or Harlequin octopus, is a species of octopus known for its intelligence and gregarious nature.[1] The species was first documented in the 1970s and, being fairly new to scientific observation, has yet to be scientifically described. Because of this, LPSO has no official scientific name.[2][3] Unlike other octopus species which are normally solitary, the LPSO has been reported as forming groups of up to 40 individuals.[4][5][6] While most octopuses are cannibalistic and have to exercise extreme caution while mating, these octopuses mate with their ventral sides touching, pressing their beaks and suckers together in an intimate embrace.[7] The LPSO has presented many behaviors that differ from most species of octopus, including intimate mating behaviors, formation of social communities, unusual hunting behavior, and the ability to reproduce multiple times throughout their life.[8] The LPSO has been found to favor the tropical waters of the Eastern Pacific.[2]

Larger Pacific striped octopus
A Larger Pacific striped octopus. A bit off to the left at the centre-bottom, another of this species of octopus is visible.
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Octopoda
Family:
Octopodidae
Genus:
Octopus
Subgenus:
Octopus
Species:
O. sp
Binomial name
Octopus sp

Appearance
Larger Pacific striped octopus

LPSO exhibits three main body color patterns that include completely pale, completely dark brown, and a dark brown and white pattern that is referred to as "stripe-bar-spot".[2] When displaying the stripe-bar-spot body color pattern, LPSO is observed to have bar and stripe patterns that alternate between brown and white across its head and mantle, and dark brown with white spots over its arm crown and arms.[2] The pattern can serve as a unique identifier as it varies among individuals.[2] Though LPSO has similar body color patterns to other octopuses like Octopus chierchiae,[9] Octopus zonatus,[10] Abdopus spp.,[11] Thaumoctopus mimicus,[12] and Wunderpus photogenicus,[12] the body patterns it exhibits are unique to the species.

Habitat and distribution

LPSO has been documented in many locations throughout the tropics of the Eastern Pacific. Specimens have been located in the Bay of Panama, Panama, Guatemala, Magdelena Bay, Baja Sur, Mexico, the northern Pacific coast of Colombia, and Nicaragua.[2] LPSO seems to prefer denning in areas with soft muddy substrates or a mix of mud and sand, ranging in depth from 7m to 100m.[2] The species has also been observed to form colonies of up to 40 close-living individuals.[4] These colonies of LPSO construct dens within 1m of one another and live in the same general area for the span of their lives.[4]

Mating

LPSO is known in particular for its display of mating behaviors that are vastly different from most octopus species. While most octopuses use either "distance mating" (when the male places hectocotylus into the female's mantle from a safe distance) or a mounting position,[13][14][15] LPSO uses a more intimate approach. Typically, a brooding female that is ready to mate exhibits an entirely pale body color pattern while the male exhibits a high contrast stripe-bar-spot body color pattern.[2] Once the male and female LPSO decide to mate, they join together in a beak-to-beak position, embracing in an entanglement of arms.[2] Unlike some species of octopus, female LPSO are not cannabalistic during mating and are rather gentle, leaving only surface level sucker marks as a result of the beak-to-beak embrace.[2]

Pair bonding has been observed in LPSO through behaviors such as food and den sharing.[2]

Brooding

Unlike most octopus species, LPSO can spawn multiple times throughout the span of their life.[2] Eggs are laid in pairs within the den and the female tends to them until they hatch, running the tips of her arms over them to maintain the health of the eggs.[2]
Once hatched from the egg, the offspring are pelagic until adulthood.[16]

Hunting

LPSO has been observed to prey upon a variety of shellfish including shrimp, stomatopods, crabs, and bivalves.[2] They use hunting methods of stalking, chasing, and ambush depending on the prey item in question.[2] When eating bivalves, smaller prey is either crushed or pulled apart, while holes are drilled into larger prey.[2] When hunting shrimp, LPSO carefully extends its arm, suckers positioned outward, to touch and capture the shrimp.[2] When hunting crabs, LPSO uses an ambush method, pouncing directly onto the crab for capture.[2]

Lifespan

LPSO live about two years.[3]

Like most octopus species, LPSO goes through a stage of senescence, which marks the approach of death.[2] Senescence in LPSO has been observed to be longer for females and shorter for males.[2] After the first signs of senescence, males will typically last 1 to 2 weeks before death, while females will typically last between 2 and 4 months.[2]

References
  1. Ghose, Tia (2013-03-06). "PHOTOS: Rare Kissing Octopus Unveiled For The First Time". HuffPost. Retrieved 2019-04-14.
  2. Caldwell, Roy L.; Ross, Richard; Rodaniche, Arcadio; Huffard, Christine L. (Aug 12, 2015). "Behavior and Body Patterns of the Larger Pacific Striped Octopus". PLOS ONE. 10 (8): e0134152. Bibcode:2015PLoSO..1034152C. doi:10.1371/journal.pone.0134152. ISSN 1932-6203. PMC 4534201. PMID 26266543.
  3. Rowan Hooper (Dec 21, 2019). "Octopuses were thought to be solitary until a social species turned up". New Scientist.
  4. Moynihan, Martin. The Behavior and Natural History of the Caribbean Reef Squid, Sepioteuthis Sepioidea, With a Consideration of Social, Signal, and Defensive Patterns for Difficult and Dangerous Environments. P. Parey, 1982. OCLC 1086727999.
  5. Graber, Shane. "Forgotten octopus rejects solitary lifestyle". Retrieved 2019-04-14.
  6. Harmon, Katherine. "Rare Social Octopuses Break All the (Mating) Rules [Video]". Scientific American Blog Network. Retrieved 2019-04-14.
  7. States379-8000, CA 94118 United. "Larger Pacific Striped Octopus". California Academy of Sciences. Retrieved 2019-04-14.
  8. Harmon Courage, Katherine (2014-07-30). "Social Octopus Species Shatters Beliefs About Ocean Dwellers". National Geographic News. Retrieved 2019-04-14.
  9. Rodaniche, Arcadio F. (1984). "Iteroparity in the lesser Pacific striped octopus Octopus chierchiae (Jatta, 1889)". Bulletin of Marine Science. 35 (1): 99–104 – via Ingenta Connect.
  10. Voss, Gilbert L. (1968). Octopods from the R/V Pillsbury southern Caribbean Cruise, 1966, with a description of a new species, octopus zonatus. OCLC 964398146.
  11. Norman, M. D.; Finn, J. (2001). "Revision of the Octopus horridus species-group, including erection of a new subgenus and description of two member species from the Great Barrier Reef, Australia". Invertebrate Systematics. 15 (1): 13. doi:10.1071/it99018. ISSN 1445-5226.
  12. HUFFARD, CHRISTINE L.; SAARMAN, NORAH; HAMILTON, HEALY; SIMISON, W. BRIAN (2010-08-24). "The evolution of conspicuous facultative mimicry in octopuses: an example of secondary adaptation?". Biological Journal of the Linnean Society. 101 (1): 68–77. doi:10.1111/j.1095-8312.2010.01484.x. ISSN 0024-4066.
  13. Hanlon, R.T. (1998). "J.B. Messenger Cephalopod behaviour. xvi, 232p. Cambridge University Press, 1996. Price £50.00". Journal of the Marine Biological Association of the United Kingdom. 76 (4): 1118. doi:10.1017/s0025315400041060. ISSN 0025-3154.
  14. Mangold, K (1987). "P. R. Boyle, editor. Cephalopod Life Cycles. Volume II. Comparative Reviews. xxi, 441 pp. Academic Press, 1987. Price £78". Journal of the Marine Biological Association of the United Kingdom. 68 (1): 215. doi:10.1017/s0025315400050190. ISSN 0025-3154.
  15. Wells, M.J.; Wells, J. (1972). "Sexual displays and mating of Octopus vulgaris Cuvier and O. cyanea Gray and attempts to alter performance by manipulating the glandular condition of the animals". Animal Behaviour. 20 (2): 293–308. doi:10.1016/s0003-3472(72)80051-4. ISSN 0003-3472. PMID 4644156.
  16. Rodaniche, Arcadio F. (1991). "Notes on the behavior of the Larger Pacific Striped Octopus, an undescribed species of the genus Octopus". Bulletin of Marine Science. 49: 667.
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