Sea slug

Sea slug is a common name which is applied to some marine invertebrates that more or less resemble terrestrial slugs. Most creatures known as sea slugs are actually snails, i.e. they are sea snails (marine gastropod mollusks) that over evolutionary time have lost their shells, or have a greatly reduced shell or an internal shell. The name "sea slug" is most often applied to nudibranchs, as well as to a paraphyletic set of other marine gastropods without obvious shells.

The phrase "sea slug" is, however, also sometimes applied to taxa in other phyla, such as the sea cucumbers, which are not mollusks but echinoderms. Although the other animals sometimes called "sea slugs" are not gastropods, they are nonetheless soft-bodied, and their overall shape is slug-like.

Sea slugs come in an outstanding variety of shapes, colors, and sizes, with gills and pointed tentacles on their backs. Sea slugs have translucent bodies that have just about every color on the rainbow. Due to the bright, outgoing colors found on the reef, there is a constant threat of predators. This is the cause for a warning of color to show the sea slugs’ predators that they are poisonous with stinging cells, but their colors are mainly for disguise. Like all gastropods, they have razor-sharp teeth, called radulas. Most sea slugs have two pairs of tentacles on their head used primarily for sense of smell, with a small eye at the base of each tentacle. Many have feathery structures (ceratia) on the back, often in a contrasting color. These act as gills. All species of sea slugs have a selected prey, that is specifically fitted for them to hunt. This can be among other sea slugs, jellyfish, bryozoans, sea anemones, plankton, and other various organisms.

Slug (disambiguation)

A slug is a gastropod mollusk without a shell or with a very small internal shell.

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Slugs (autopilot system)

Slugs is an open-source autopilot system oriented toward inexpensive autonomous aircraft. Low cost and availability enable hobbyist use in small remotely piloted aircraft. The project started in 2009 and is being further developed and used at Autonomous Systems Lab of University of California Santa Cruz Several vendors are currently producing Slugs autopilots and accessories.

Overview

An autopilot allows a remotely piloted aircraft to be flown out of sight. All hardware and software is open-source and freely available to anyone under the MIT licensing agreement. free software autopilots provide more flexible hardware and software. Users can modify the autopilot based on their own special requirements, such as forest fire evaluation. The free software approach from Slugs is similar to that from the paparazzi Project, PX4 autopilot, ArduCopter and OpenPilot where low cost and availability enables its hobbyist use in small remotely piloted aircraft such as micro air vehicles and miniature UAVs. Such frameworks are common in Open-source robotics.

Slugs (film)

Slugs, muerte viscosa is a 1988 American/Spanish horror film based on the novel Slugs by Shaun Hutson.

Synopsis

A rural town becomes prey to a strain of black slugs spawned from toxic waste dumping. It is up to the local health inspector to stop them. People are dying mysteriously and gruesomely. Only health worker Mike Brady has a possible solution, but his theory of killer slugs is laughed at by the authorities. Only when the body count begins to rise and a slug expert begins snooping around does it begin to appear as though Mike's theory might be right.

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Sea

A sea is a large body of salt water that is surrounded in whole or in part by land. More broadly, "the sea" is the interconnected system of Earth's salty, oceanic waters—considered as one global ocean or as several principal oceanic divisions. The sea moderates Earth's climate and has important roles in the water cycle, carbon cycle, and nitrogen cycle. Although the sea has been travelled and explored since prehistory, the modern scientific study of the sea—oceanography—dates broadly to the British Challenger expedition of the 1870s. The sea is conventionally divided into up to five large oceanic sections—including the IHO's four named oceans (the Atlantic, Pacific, Indian, and Arctic) and the Southern Ocean; smaller, second-order sections, such as the Mediterranean, are known as seas.

Owing to the present state of continental drift, the Northern Hemisphere is now fairly equally divided between land and sea (a ratio of about 2:3) but the South is overwhelmingly oceanic (1:4.7).Salinity in the open ocean is generally in a narrow band around 3.5% by mass, although this can vary in more landlocked waters, near the mouths of large rivers, or at great depths. About 85% of the solids in the open sea are sodium chloride. Deep-sea currents are produced by differences in salinity and temperature. Surface currents are formed by the friction of waves produced by the wind and by tides, the changes in local sea level produced by the gravity of the Moon and Sun. The direction of all of these is governed by surface and submarine land masses and by the rotation of the Earth (the Coriolis effect).

Sea (astronomy)

The Sea or the Water is an area of the sky in which many water-related, and few land-related, constellations occur. This may be because the Sun passed through this part of the sky during the rainy season.

Most of these constellations are named by Ptolemy:

Sometimes included are the ship Argo and Crater the Water Cup.

Some water-themed constellations are newer, so are not in this region. They include Hydrus, the lesser water snake; Volans, the flying fish; and Dorado, the swordfish.

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SEA

SEA or Sea may refer to:

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