Pre-Historic Sea Dogs The word shark is thought to be driven from the Mayan word xoc which can pronounced shawk or shock meaning fish. Sailors once called them seadogs because their relative resemblance of dogs and not until the late fifteen hundreds were they called sharks. Sailors saw one and began to call the sea dogs of the Caribbean Sea sharks and to eventually refer to sharks in whole as a species. Sharks are a part of group of fish that have been dated with a fossil record back four hundred fifty million years ago to the late Devonian period in which land vertebrates had not yet taken form. Most of the time only the teeth are found due to the internal skeleton made of cartilage in which easily decays.
JELLYFISH Jellyfish are very unique, aquatic creatures. They have drifted along on ocean currents for millions of years, even before dinosaurs lived on the Earth. They just float around and look weird. A jellyfish jiggles like gelatin, and some just look like small, clear blobs. But others are bigger and more colorful with a bunch of tentacles that hang down underneath it, kind of like an octopus.
Tetrodotoxin may be present in the roe of species inhabiting the waters of Thailand. Because of their origin 450 million years ago, horseshoe crabs are considered living fossils. Classification Horseshoe crabs resemble crustaceans, but belong to a separate subphylum, Chelicerata, and are closely related to arachnids. The earliest horseshoe crab fossils are found in strata from the late Ordovician period, roughly 450 Mya. The Limulidae are the only recent family of the order Xiphosura, and contain all four living species of horseshoe crabs: Carcinoscorpius rotundicauda, the mangrove horseshoe crab, found in Southeast Asia Limulus polyphemus, the Atlantic horseshoe crab, found along the American Atlantic coast and in the Gulf of Mexico Tachypleus gigas, found in Southeast and East Asia Tachypleus tridentatus, found in Southeast and East Asia Anatomy and behavior The entire body of the horseshoe crab is protected by a hard carapace.
Writing Assignment 2 The Hawaiian Bobtail Squid Euprymna scolopes Matthew Chung BIO 172L Angela April 21st, 2013 In the marine coastal environment of the Hawaiian archipelago, the Hawaiian bobtail squid, Euprymna scolopes, is a fascinating mollusk that belongs to the class cephalopoda. Mollusks are bilaterally symmetrical and are believed to have evolved from annelid-like ancestors. In lab, the clam from the Bivalve class was studied to get a better understanding of the phylum Mollusca. With over 85,000 species recognized in this phylum, the Hawaiian bobtail squid is just one of the many fascinating mollusks discovered (Boyle and Boletzky 1996). Cephalopods such as E. scolopes appear to be very different from other mollusks, but physiologically they are similar.
Sidewinders are a nocturnal species of rattlesnake that live in the desert southwest from California to New Mexico and range in size from 6 inches at birth to adults up to 30 inches. They, like all rattlesnakes are a member of the pit viper family. All rattlesnakes share four distinct features; the venom, the pits, the fangs, and the rattle. Sidewinders have also evolved rough scales, and horns above its eyes specifically designed to help it survive in its environment. This paper will discuss these 5 traits.
Jellyfish have a bag of cells in the inside and the outside. All cnidarian have stinging cells to help catch their pray. Cnidarian have stings to use them as a dispensable tool. There are many different types of jellyfish, for example the Australian Box jellyfish. This particular jellyfish is believed to be the most deadly.
Widely published data of specimens that were reported to have been even several feet longer are not verified.  There are dwarf forms on Java, Bali and Sulawesi. On Bali they reach an average length of 2 metres (6.6 ft), and on Sulawesi they achieve a maximum of 2.5 metres (8.2 ft).  Geographic range and habitat Natural Distribution of the Burmese Python (green). The Burmese Python are found throughout Southern- and Southeast Asia, including Eastern India, Nepal, western Bhutan, southeastern Bangladesh, Myanmar, Thailand, Laos, Cambodia, Vietnam, northern continental Malaysia, far southern China (Fujian, Jiangxi, Guangdong, Hainan, Guangxi and Yunnan), Hong Kong, and in Indonesia on Java, southern Sulawesi, Bali and Sumbawa.
These fish evolved from each other over time, and by analyzing their genomes we can obtain insights on their ancestry. What can make this possible is the elephant shark (Callorhinchus milii). Exclusive from other chondrichthyes, elephant sharks genomes are relatively small and have evolved the slowest of any other vertebrate known today. With this information at our disposal we can gain a greater comprehension for the beginning of adaptive immunity, and what caused gnathostomes to separate millions of years ago. When comparing the immune systems of cartilaginous fish to mammals you see numerous similarities, but the traits that make them different are distinct.
Turtles are reptiles of the order Chelonii or Testudines characterised by a special bony or cartilaginous shell developed from their ribs and acting as a shield.  Turtle may refer to the chelonian order as a whole (American English) or to fresh-water and sea-dwelling chelonians (British English).  The order Chelonii or Testudines includes both extant (living) and extinct species. The earliest known turtles date from 220 million years ago, making turtles one of the oldest reptile groups and a more ancient group than lizards, snakes or crocodiles. Of the many species alive today, some are highly endangered.