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Gladius, showing measurement of rachis and vane. The gladius (pl.: gladii), or pen, is a hard internal bodypart found in many cephalopods of the superorder Decapodiformes (particularly squids) and in a single extant member of the Octopodiformes, the vampire squid (Vampyroteuthis infernalis). [1]
Dermal structures of selected squid species [1] Species Family Structure Shape Size in mm (ML in mm) Tissue Epidermis over structure Asperoteuthis acanthoderma: Chiroteuthidae: Tubercles: Conical: 1.0 × 0.4 (144) Hyaline-like cartilage: Yes Cranchia scabra: Cranchiidae: Tubercles: Round, triangular, or rectangular bases with 2–5 projections ...
The squid giant synapse (Fig 1) was first recognized by John Zachary Young in 1939. It lies in the stellate ganglion on each side of the midline, at the posterior wall of the squid’s muscular mantle. Activation of this synapse triggers a synchronous contraction of the mantle musculature, causing the forceful ejection of a jet of water from ...
The internal anatomy is visible, including the paired siphons to the right. A siphon is an anatomical structure which is part of the body of aquatic molluscs in three classes: Gastropoda, Bivalvia and Cephalopoda (members of these classes include saltwater and freshwater snails, clams, octopus, squid and relatives).
The squid giant axon is the very large (up to 1.5 mm in diameter; typically around 0.5 mm) ... using the longfin inshore squid as the model organism. [7] ...
Squid in the family Pyroteuthidae have Photophores (small, light-producing organs) on viscera (internal organs), stalk of tentacles, and five large and ten small photophores underneath the eyes. [4] The squid has a wide, triangular mantle with a rounded posterior end and rounded fins on the distal dorsal end of the mantle. [5]
The light organ of embryonic and juvenile squids has a striking anatomical similarity to an eye and expresses several genes similar to those involved in eye development in mammalian embryos (e.g. eya, dac) which indicate that squid eyes and squid light organs may be formed using the same developmental "toolkit".
Taningia danae, the Dana octopus squid, is a species of squid in the family Octopoteuthidae. It is one of the largest known squid species , reaching a mantle length of 1.7 m (5.6 ft) [ 3 ] and total length of 2.3 m (7.5 ft). [ 4 ]