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The mantle is cup-shaped and elongates considerably in females when they mature. The fins are a third to a half the length of the mantle and roughly half its width. The ventral (under) surface of the mantle has a complex arrangement of large and small compound light-emitting photophores , and seventeen large and one small photophore surround ...
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 ...
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]
Bathothauma lyromma is an atypical glass squid which has very large paralarva which can reach a mantle length of 100mm and has its eyes mounted on a long stalk possesses and a very long brachial pillar. Both these features are reabsorbed as the paralarva matures into a subadult. As an adult it grows to a mantle length of 200mm.
Chiroteuthis imperator. The Chiroteuthidae are most notable for their unique paralarval stage, known as the doratopsis [2] stage. Although morphology varies greatly within the family, the Chiroteuthidae are distinguished by their extremely elongated bodies and (in most species) tentacles; the latter may be up to four times the mantle length in Asperoteuthis acanthoderma.
Loligo reynaudii is a marine cephalopod characterized by its elongated slender body, eight short arms, and two long retractile tentacles adorned with suckers. With diamond-shaped fins spanning over half the length of its up to 40 cm (16 in) mantle, this species exhibits distinctive features.
The mantle is conical and elongated with a narrow rear tip. The mantle walls are thin and leathery. The funnel locking-apparatus are small and oval to spindle-shaped. A single cartilaginous tubercle is present at the mantle margins, though rarely it may be absent. The fins are long and narrow, starting at about 40 to 60% of the length of the ...
The Patagonian squid is a small species and has a mantle length of 10 to 15 cm (4 to 6 in) and a weight of between 75 and 150 grams (2.6 and 5.3 oz). [4] The mantle is somewhat elongated and on either side at the posterior end are rhomboidal fins, rather less than half the length of the mantle. At the anterior end are four pairs of arms and a ...