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Glossary
Abyssal
Species associated with sea bottoms of great depths (> 4000 m).
Adipose fin
Small rounded fin located dorsally before the caudal peduncle and tail fin.
Amphipod
Small crustacean with a laterally-compressed body.
Anadromous
Fish that migrate from marine to freshwater to spawn.
Anal fin
Fin on the median ventral line behind the anus.
Barbels
Short, fleshy filaments on the lower jaw or nose of some fish species (Gadidae)
Bathypelagic
Species associated with the water column below all surface light (400-1000 m).
Canal, siphonal
Outer groove on gasteropod shells from which the siphon protrudes.
Carinate
With a crest or ridge, such as a line on the carapace.
Caudal fin
Tail fin.
Cephalothorax
Anterior part of crustacean body, comprising the fused head and thorax and covered by a carapace.
Chelicerae
Mouth parts, as found in spiders.
Chelipeds
Limbs with pincers in crustaceans
Cirri
Fleshy protuberances located above the eyes in the Northern octopus
Demersal
Species found near or on the sea bottom.
Dorsal blade
Keel or blade-like, triangular structure located anterior to the dorsal fin.
Dorsal fin
Fin along the back, behind the head.
Fork length
Measure from the most anterior part of the head to the end of the middle ray of caudal fin.
Isopod
Crustacean lacking a carapace and with a dorso-ventrally
compressed bodyform.
Lateral line
Sensory organ of fishes, which consists of a canal running along the side of the body.
Mantle
Flesh in form of a cylinder or a sack that envelopes the body of cephalopods.
Ocellus
Spot or marking in form of a ring.
Opercule
Calcareous plate used to covering the shell mouth of gasteropod molluscs; protective plate covering the gills in fishes.
Ocelle
Tache en forme d’anneau.
Opercule
Pièce calcaire qui ferme l'ouverture de la coquille des mollusques gastéropodes.
Pectoral fin
Pair of fins behind the gills.
Peduncle
Narrow part of fish body between the anal and caudal fin; support stalk in invertebrates.
Pelagic
Species associated with the water column from 0 to 200 m depth.
Pelvic fin
Pair of belly fins, usually between the pectoral and anal fins.
Photophore
Organ that produces or distributes bioluminescence.
Pinnula
Series of small finlets posterior of the anal and dorsal fins (Scomberidae).
Preopercular spines
Spines on the gill covers, particularly characteristic in sculpins.
Rostrum
Narrow, dorso-anterior projection of the carapace,
characteristic of crustaceans.
Siphon
Extensible, fleshy tube in Gasteropoda that serves for respiration or feeding.
Supraorbital spines
Spines just above the eye in crustaceans.
Tentacles
Pair of elongated arms in squid and sepiolids, usually with suckers only at the ends.
Total length
Measure from the most anterior end of the head to the
end of the longest rays of the caudal fin.
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| Reviewed: 2008-01-23 | ||
