Diamondback Squid – Thysanoteuthis rhombus

, Diamondback Squid, Thysanoteuthis rhombus
Water Type: Marine
Red List Status: Least concern (LC)
Temperature: 50 °F - 77 °F (10°C - 25°C)

Alaska, Albania, Algeria, American Samoa, Andaman and Nicobar, Angola, Anguilla, Antarctica, Antigua and Barbuda, Arctic, Argentina, Aruba, Ascension Island, Australia, Azores Islands, Bahamas, Bahrain, Bangladesh, Barbados, Belize, Benin, Bermudas, Brazil, Brunei Darussalam, Bulgaria, Cambodia, Cameroon, Canada, Canary Islands, Cape Verde, Cayman Islands, China, Christmas Island, Cocos Islands, Colombia, Comoros, Congo, Cook Islands, Costa Rica, Croatia, Cuba, Curaçao, Cyprus, Democratic Republic of the Congo, Djibouti, Dominica, Dominican Republic, Ecuador, Egypt, El Salvador, England, Equatorial Guinea, Eritrea, Fiji, France, French Guiana, French Polynesia, Gabon, Galapagos Islands, Gambia, Ghana, Greece, Grenada, Guadeloupe, Guam, Guatemala, Guinea, Guinea-Bissau, Guyana, Haiti, Hawaii, Honduras, India, Indonesia, Iran, Iraq, Ireland, Israel, Italy, Ivory Coast, Jamaica, Japan, Kenya, Kiribati, Kuwait, Lebanon, Liberia, Libya, Madagascar, Madeira Islands, Malaysia, Maldives, Malta, Marshall Islands, Martinique, Mauritania, Mauritius, Mayotte, Mexico, Micronesia, Montenegro, Montserrat, Morocco, Mozambique, Myanmar, Namibia, Nauru, New Caledonia, New Zealand, Nicaragua, Nigeria, Niue, North Korea, Northern Ireland, Oman, Pakistan, Palau, Panama, Papua New Guinea, Peru, Philippines, Portugal, Puerto Rico, Qatar, Romania, Russia, Saint Helena, Saint Kitts and Nevis, Saint Lucia, Saint Vincent And The Grenadines, Samoa, São Tomé and Príncipe, Saudi Arabia, Scotland, Senegal, Seychelles, Sierra Leone, Singapore, Slovenia, Solomon Islands, Somalia, South Africa, South Korea, Spain, Sri Lanka, Sudan, Suriname, Syria, Taiwan, Tanzania, Thailand, Timor-Leste, Togo, Tonga, Trinidad and Tobago, Tunisia, Turkey, Turks and Caicos Islands, Tuvalu, Ukraine, United Arab Emirates, United Kingdom, United States Minor Outlying Islands, Uruguay, USA, Vanuatu, Venezuela, Vietnam, Virgin Islands, Wales, Wallis and Futuna, Western Sahara, Yemen

The Diamondback Squid, scientifically known as Thysanoteuthis rhombus, is a fascinating cephalopod species that stands out for its unique physical attributes and intriguing behavior. This squid, a member of the Thysanoteuthidae family, is a captivating inhabitant of the open ocean, showcasing the diverse range of life found within these vast aquatic environments.

Description & Characteristics

The Diamondback Squid is readily identified by its distinctive diamond-shaped mantle, which gives it its common name. This characteristic shape is formed by a series of prominent ridges that run along the back of the squid’s body. It’s also known for its large, prominent eyes, which are adapted for low-light conditions prevalent in its deep-water habitat. Its body is typically a reddish-brown color, blending seamlessly with the surrounding environment.

Adult Diamondback Squids can grow to an impressive size, reaching a maximum mantle length of up to 60 centimeters (24 inches). The length of the arms and tentacles can further increase their overall size, adding to their imposing presence in the open ocean.

Habitat and Occurrence

The Diamondback Squid, Thysanoteuthis rhombus, is a resident of the open ocean, inhabiting the epipelagic and mesopelagic zones. These zones extend from the surface to a depth of about 1,000 meters, encompassing vast expanses of the ocean where sunlight gradually diminishes. The Diamondback Squid is thus a true dweller of the twilight zone, where light levels are significantly reduced but still present.

The distribution of Thysanoteuthis rhombus spans across various oceanic regions, including the Atlantic, Pacific, and Indian Oceans. It’s a common sight in these vast watery realms, contributing to the rich tapestry of life found within the world’s oceans.

Taxonomy

The Diamondback Squid, Thysanoteuthis rhombus, occupies a specific place within the scientific classification of living organisms. It belongs to the Class: Cephalopoda, a group of highly intelligent and diverse marine creatures that includes octopuses, squid, and cuttlefish. Further categorization places it within the Order: Oegopsida, a group of squid characterized by their distinctive internal shells. Lastly, the family Thysanoteuthidae accommodates Thysanoteuthis rhombus, recognizing its unique anatomical features and evolutionary history.

Feeding

The Diamondback Squid, Thysanoteuthis rhombus, is a voracious predator, playing a vital role in the ocean’s food web. Its diet consists primarily of a wide range of prey items, including larger fish, crabs, and various crustaceans, including the edible crab. Small fish are also a significant part of its diet, highlighting the diverse range of food sources it utilizes. This impressive range of prey demonstrates the adaptability and predatory prowess of the Diamondback Squid in its deep-sea environment.

Associated Species

Image References

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