Webb10 apr. 2024 · Generally speaking, the reproduction of bivalves occurs when the warm season arrives and the oceanic waters exceed 24 ºC/75 ºF. We can use various species of oyster as an example of bivalve mollusk reproduction. Oysters release pheromones into the water that shows their reproductive status and attracts a mate. Webb12 apr. 2024 · Phylum: Chordata – cordés, cordado, chordates : Subphylum: Vertebrata – vertebrado, vertébrés, vertebrates : Infraphylum: Gnathostomata Superclass: …
Blue shark - Wikipedia
Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the Batoidea (rays and kin). Some … Visa mer Until the 16th century, sharks were known to mariners as "sea dogs". This is still evidential in several species termed "dogfish," or the porbeagle. The etymology of the word shark is uncertain, the most … Visa mer Teeth Shark teeth are embedded in the gums rather than directly affixed to the jaw, and are constantly … Visa mer Buoyancy Unlike bony fish, sharks do not have gas-filled swim bladders for buoyancy. Instead, sharks rely on a large … Visa mer Shark lifespans vary by species. Most live 20 to 30 years. The spiny dogfish has one of the longest lifespans at more than 100 years. Whale sharks (Rhincodon typus) may also live over 100 years. Earlier estimates suggested the Greenland shark (Somniosus microcephalus) … Visa mer Fossil record The oldest total-group chondrichthyans, known as acanthodians or "spiny sharks", appeared during the … Visa mer Smell Sharks have keen olfactory senses, located in the short duct (which is not fused, unlike bony fish) between the anterior and posterior nasal openings, with some species able to detect as little as one part per million of … Visa mer The classic view describes a solitary hunter, ranging the oceans in search of food. However, this applies to only a few species. Most live far more social, sedentary, benthic lives, and appear likely to have their own distinct personalities. Even solitary sharks … Visa mer WebbMaryland Checklist - Phylum: Lycopodiophyta - all-time (Total: 17) ... earth cad download
15 Amazing Whale Shark Facts, Types of Sharks - SmartClass4Kids
WebbTo celebrate World Oceans Day (8 June) we're showcasing 5 extraordinary connections between sharks and other marine species: BANDED SEASNAKES: Without banded seasnakes baby Zebra Sharks would have a much lower survival rate. Born dark brown with white stripes they mimic these venomous snakes. They even move in a snake-like way! Webb31 mars 2024 · fish, any of approximately 34,000 species of vertebrate animals (phylum Chordata) found in the fresh and salt waters of the world. Living species range from the primitive jawless lampreys and hagfishes through the cartilaginous sharks, skates, and rays to the abundant and diverse bony fishes. Most fish species are cold-blooded; … WebbOtodontidae is an extinct family of sharks belonging to the order Lamniformes.Its members have been described as megatoothed sharks. They lived from the Early Cretaceous to the Pliocene, and included genera such as Carcharocles and Otodus, including the giant megalodon. Recent studies of the newly described genus … ctenophora anatomy