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The mantle cavity is a central feature of molluscan biology. This cavity is formed by the mantle skirt, a double fold of mantle which encloses a water space. This space contains the mollusk's gills, anus, osphradium, nephridiopores, and gonopores. The mantle cavity functions as a respiratory chamber in most mollusks. In bivalves it is usually ...
R. palpebrosa is a small squid growing to approximately 45 mm (2 in) in mantle length. [4] The mantle is rounded posteriorly and not fused with the head dorsally. The head is wide, and it and mantle are covered in tubercles which are often large and widely distributed but, in juveniles and as a local variant, they are small and not easily observable.
Within the mantle cavity there are three visceral photophores, an oval, anal photophore, a posterior intestinal photophore and an elongated posterior visceral photophore which forms a strip. [4] It has a broad head which is at least as wide as the mantle and there is an elongated photophore patch on the ventral surface of both eyes. [ 3 ]
The squid grow up to an impressive 1.6 feet (counting the mantle, not the tentacles), all within a lifespan of six months to a year. Once they reproduce, they die. Once they reproduce, they die.
Sepiola atlantica has a latitudinal range from 65ºN to 35ºN, ranging from Iceland, the Faroe Islands and western Norway in the north south to the Moroccan coast. There is a single record of this species from the Mediterranean Sea, a mature male caught in the Tyrrhenian Sea at a depth of 90m. [3]
They are arranged into concentric circles on the bloated mantle, confusing predators as to the location of the eyes. If the threat still does not go away, its last resort is to again eject ink. However, the ink is not released, instead it is retained inside the now spherical mantle cavity. The squid thus becomes a completely opaque black ball. [34]
Thysanoteuthis rhombus, also known as the diamond squid, diamondback squid, or rhomboid squid, is a large species of squid from the family Thysanoteuthidae which is found worldwide, throughout tropical and subtropical waters. T. rhombus is given its name for the appearance of the fins that run the length of the mantle. They are a fast growing ...
The squid floats along the water upside down with one eye aimed at the ocean floor and the other looking above. Named for its bright red color, the squid has red-tinted photophores (light-emitting ...