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The operculum lies on the top rear part of the foot. When the foot is retracted, the operculum is rotated 180° and closes the shell. [2] An operculum (fish), a flap that covers the gills in bony fishes and chimaeras. The cover that rapidly opens a cnida of a cnidarian such as a jellyfish or a sea anemone. The lid may be a single hinged flap or ...
Opercular series in bony fish: operculum (yellow), preoperculum (red), interoperculum (green) and suboperculum (pink) The operculum is a series of bones found in bony fish and chimaeras that serves as a facial support structure and a protective covering for the gills ; it is also used for respiration and feeding.
Osteichthyes (/ ˌ ɒ s t iː ˈ ɪ k θ iː z / ost-ee-IK-theez; from Ancient Greek ὀστέον (ostéon) 'bone' and ἰχθύς (ikhthús) 'fish'), [2] also known as osteichthyans or commonly referred to as the bony fish, is a diverse superclass of vertebrate animals that have endoskeletons primarily composed of bone tissue.
Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million in total. Animals range in size from 8.5 millionths of a metre to 33.6 metres (110 ft) long and have complex interactions with each other and their environments, forming intricate food webs .
The federal Endangered Species Act was enacted on Dec. 28, 1973. Fifty years later, Pa. wildlife experts discuss the successes and challenges.
The current International Game Fish Association all-tackle world record for a white crappie is 2.35 kg (5.2 lb), caught on July 31, 1957, near Enid Dam, Mississippi, by angler Fred Bright, while the IGFA all-tackle length world record is a 39-centimetre (15 in) fish, caught on October 14, 2022, in Grenada Lake, Mississippi, by angler Doug Borries.
A Pennsylvania angler caught his ‘unicorn’ fish Sunday in Erie. Colton Alex, 18, of Erie, was fishing in a tournament in Lake Erie when he hooked into a large Atlantic Salmon.
The common periwinkle or winkle (Littorina littorea) is a species of small edible whelk or sea snail, a marine gastropod mollusc that has gills and an operculum, and is classified within the family Littorinidae, the periwinkles. [2] This is a robust intertidal species with a dark and sometimes banded shell.