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Red Sea Octopus

Abdopus horridus (d'Orbigny 1826)

Comprehensive Description

provided by Smithsonian Contributions to Zoology
Octopus horridus Orbigny, 1826

DIAGNOSIS.—Animals small to medium-sized (to ~30 mm ML). Mantle rounded medially, pointed apically (MWI 58–88.7); neck region relatively long and strongly constricted; head moderate in width (HWI 50–80); eyes strongly projecting. Funnel tapered, narrow at aperture, funnel organ W-shaped, outer limbs about 20% shorter than medial limbs. Arms moderate to long (ALI 77–84.5), arm formula variable, typically IV = III = II > I; arms tapering to slender tips. Suckers moderate in size, larger in males (SIn 11.8–16.5) than in females (SIn 9.5–13.5), suckers deeply set into arms; in males, 6, 14, and 18 suckers especially enlarged on arms II, III, and IV, respectively, beginning with sucker number 10 or 11, enlarged suckers increase in size from arms II to arms IV (SIe 20.5). Right arm III of male hectocotylized (HALI 302–345), shorter than fellow (FAI 76.6); ligula small (LLI 1.8–4.0), narrow, pointed apically, with shallow groove with weak transverse laminae; calamus large (CLI 33.3), pointed, HASC 90. Web shallow (WDI 9.5–16.5), web sectors subequal but with tendency for sector A to be shallowest. Gill lamellae 5 to 6. Male with simple, moderately sized penis (PLI 24.1) with short, rounded diverticulum roughly in line with long axis of penis. Radula with A3 seriation of the rachidian; rachidian simple with single denticle on either side of median cusp. Surfaces of mantle, head, and arms with numerous unbranched, warty papillae, single papillae typically present in center of light-colored patches; general skin texture warty. Color in life reddish magenta-purple reticulated with large, circular to oval white spots; when alarmed, ground color deepens and lighter spots become light reddish purple. Color in preservation (alcohol) tan to brown with dark splotches on head and mantle and reticulated pattern of brown splotches on dark background down dorsal and aboral surfaces of arms; ventral surfaces of mantle and arms lighter.

ORIGINAL DESCRIPTION.—Orbigny, 1826:144.

TYPE LOCALITY.—Red Sea, Egyptian coast.

TYPES.—Not designated. The type figure is that by Savigny, 1817: Céphalopodes, pl. 1: fig. 2 (see also “Discussion”).

DISTRIBUTION.—Red Sea, Indian Ocean, western and central Pacific Ocean? (see “Discussion”).
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bibliographic citation
Voss, N. A. and Sweeney, M. J. 1998. "Systematics and Biogeography of cephalopods. Volume II." Smithsonian Contributions to Zoology. 277-599. https://doi.org/10.5479/si.00810282.586.277

Abdopus horridus

provided by wikipedia EN

Abdopus horridus, the Red Sea octopus or common reef octopus, is a species of octopus in the genus Abdopus from the western Indian Ocean.[2] It occurs in the western Indian Ocean and the Red Sea. It has a small body and long arms with a complex skin sculpture and pigmentation pattern on the body which it uses to camouflage itself. If a predator attacks this species it is capable of autotomising its arms, once autotomisised the arm can grow back in 2–3 months. Abdopus horridus is the type species of its genus but within that genus it is rather distinct and lays larger eggs than its congeners, many of which were previously thought to be populations of this species under its synonym Octopus horridus.[3]

References

  1. ^ "Abdopus horridus (d'Orbigny, 1826)". World Register of Marine Species. Vlaams Instituut voor de Zee. 2017. Retrieved 29 January 2018.
  2. ^ Palomares ML, Pauly D, eds. (2017). "Abdopus horridus" in SeaLifeBase. October 2017 version.
  3. ^ M.D. Norman; Julian Finn (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): 13–35. doi:10.1071/IT99018. Abstract
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Abdopus horridus: Brief Summary

provided by wikipedia EN

Abdopus horridus, the Red Sea octopus or common reef octopus, is a species of octopus in the genus Abdopus from the western Indian Ocean. It occurs in the western Indian Ocean and the Red Sea. It has a small body and long arms with a complex skin sculpture and pigmentation pattern on the body which it uses to camouflage itself. If a predator attacks this species it is capable of autotomising its arms, once autotomisised the arm can grow back in 2–3 months. Abdopus horridus is the type species of its genus but within that genus it is rather distinct and lays larger eggs than its congeners, many of which were previously thought to be populations of this species under its synonym Octopus horridus.

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