Paige Sakowski Lamniformes (Greek lamna- (shark) and –forma (shape)) Taxonomy: Superclass Gnathastomata- jawed vertebrates Class Chondrichthyes Order Lamniformes- Mackerel Sharks Families Lamnidae 7 genera, ~ 16 species Common species: Carcharodon carcharias– Great White Shark Alopias vulpinus– Thresher Shark Cetorhinus maximus – Basking Shark Description: Moderate to very large, ranging from about 3.3 ft to 49 ft in length; have two dorsal fins, large pectoral fins, a small anal fin, and a lunate or semilunate caudal fin; black and round eyes that lack protective membranes; five pairs of gill openings; very small denticles along the body that do not form larger spines. Some lamniform species are capable of maintaining slightly elevated body temperatures in relation to the surrounding water, through a counter-current, vascular heat exchange system. Lamniforms are usually blue or blue-gray on their dorsal and lateral sides, but white to off-white ventrally. Habitat: present in shallow, coastal waters, as well as epipelagically and mesopelagically in deeper oceanic waters. Distribution: found worldwide in tropical and temperate marine waters. Ecology and life history: Most lamniformes are predaceous, extremely active eaters, feeding mostly on fishes of many families. Although, lamniformes also feed on large amounts of invertebrate, marine mammals, marine turtles, and some oceanic birds. Two species, the megamouth and basking sharks, feed almost exclusively on zooplankton, through filter feeding. Additional details: Many lamniformes are captured on longlines or trawls, either by accident or by the commercial fishing industry to be consumed. Sport fishing for several species is also common. This order also contains what people believe to be the most dangerous shark species, the great white shark. But the misguided perception that these sharks are potential “man-eaters” has begun to diminish. All species of lamniformes are yolksac viviparous, meaning they give birth to live young that develop in utero and feed on their yolk sacs. Recent Research: “Transoceanic Migration, Spatial Dynamics, and Population Linkages of White Sharks” An article focused on the behavioral patterns of White Sharks. References used: Bonfil, R., Meÿer, M., Scholl, M.C., Johnson, R., O'Brien, S., Oosthuizen, H., Swanson, S., Kotze, D. and Paterson, M. Transoceanic Migration, Spatial Dynamics, and Population Linkages of White Sharks. Science , New Series, Vol. 310, No. 5745 (Oct. 7, 2005), pp. 100-103 Grzimek, B. 2003. Grzimeks Animal Life Encyclopedia: Fishes. Gale Cengage Learning. www.fishbase.org