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Despite eurypterids clearly being primarily aquatic animals that almost certainly evolved underwater (some eurypterids, such as the pterygotids, would even have been physically unable to walk on land), it is unlikely the "gill tract" contained functional gills when comparing the organ to gills in other invertebrates and even fish.
USS Scorpion (SSN-589) was a Skipjack-class nuclear-powered submarine that served in the United States Navy, the sixth vessel and second submarine to carry that name. Scorpion sank on 27 May 1968. She is one of two nuclear submarines that the U.S. Navy has lost, the other being USS Thresher. [4]
The word scorpion originated in Middle English between 1175 and 1225 AD from Old French scorpion, [1] or from Italian scorpione, both derived from the Latin scorpio, equivalent to scorpius, [2] which is the romanization of the Greek σκορπίος – skorpíos, [3] with no native IE etymology (cfr.
Nepidae is a family of exclusively aquatic Heteropteran insects in the order Hemiptera. [1] They are commonly called water scorpions for their superficial resemblance to scorpions, due to their raptorial forelegs and the presence of a long slender process at the posterior end of the abdomen, resembling a tail. [2]
Eurypterus (/ j ʊəˈr ɪ p t ər ə s / yoo-RIP-tər-əs) is an extinct genus of eurypterid, a group of organisms commonly called "sea scorpions".The genus lived during the Silurian period, from around 432 to 418 million years ago.
Ranatra fusca is a water stick-insect in the family Nepidae, native to North America.It is known by the common name brown water scorpion. [1] [2] It is generally 3.2–4.2 cm (1.3–1.7 in) long. [3]
The emperor scorpion is an African rainforest species, [13] but also present in savanna.It is found in a number of African countries, including Benin, Burkina Faso, Côte d’Ivoire, Gambia, Ghana, Guinea, Guinea-Bissau, Togo, Liberia, Mali, Nigeria, Senegal, Sierra Leone and Cameroon.
Ranatra is a genus of slender predatory insects of the family Nepidae, known as water scorpions or water stick-insects. [1] There are more than 140 Ranatra species found in freshwater habitats around the world, both in warm and temperate regions, with the highest diversity in South America (almost 50 species) and Asia (about 30 species, reviewed in 1972 [2]).