This means that they use other means to trap suspended food in the water in order to be digested (Lab 7 Manual: Mollusca). One of the most intriguing aspects of cephalopods and E. scolopes, in particular is their intelligence. With a centralized brain, the largest of all invertebrates, and highly developed eyes and other sense organs, they are able to remember and learn by example or through trial and error (Nyholm, S.V., and McFall-Ngai, M.J. 2004). Cephalopods differ from other mollusks in having a distinct head, marked off
Phylum Ctenophora is not a large phylum, containing less than 200 species. Ninety of these species are referred to as the Comb Jellies; the word Ctenophora comes from the Greek word Cteno meaning comb and the word phoros, which means bearing. The sea walnut (Mnemiopsis leidyi) is one of the most common comb jelly species. Mnemiopsis leidyi is native to the Atlantic Ocean, although, they appear to have invaded the Black Sea. They were accidental introduced to the Black Sea around 1980 and the population has exploded since.
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.
Depending on the species, the body length of tarantulas ranges from, with leg spans of . Leg span is determined by measuring from the tip of the back leg to the tip of the front leg on the opposite side. Some of the largest species of tarantula may weigh over ; the largest of all, the goliath birdeater from Venezuela and Brazil, has been reported to attain a weight of and a leg-span of up to, males being the longer and females greater in girth. Theraphosa apophysis was described 187 years after the goliath birdeater; therefore its characteristics are not as well attested.Theraphosa blondi is generally thought to be the heaviest tarantula, and T. apophysis to have the greatest leg span. Two other species, Lasiodora parahybana and Lasiodora klugi, rival the size of the two goliath spiders.
Location 1 was above the high tide mark, Location 2 the tidal rock pools and location 3 the low tide mark. Many different creatures were identified in each of the areas. One of the organisms that was identified during the investigation was Tessetoporas Roseas (Barnacles). There were zero barnacles found in location 1 and 2 and 557 barnacles found in location 3 per 0.5m2. Location 3 (low tide mark) has many biotic pressures such as wave action, fluctuations in water temperature and predators.
Figure 1. First appearances and relative diversity (width of shaded area) for major groups of animals. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com), used with permission. | | Phylum Mollusca: Clams, Scallops, and Squids | Back to Top The phylum Mollusca contains over 100,000 species with a variety of body forms and lifestyles. In mollusks, the coelom is reduced and limited to the region around the heart.
Located inside the tentacles are the nematocysts or stinging cells which contain venom-filled threads. Jellyfish have only one opening on their body, the mouth. The mouth is located inside a short tube on the center of the body. The sting of a jellyfish is different for each type of jellyfish. They sting by releasing venom from their nematocysts.
2) and the strong radial ribs extending from suture to suture, which are widely spaced between one another (Fig. 1). Although difficult to notice at first, the ribs show slightly rounded knobs at their ventral end. BIOGEOGRAPHY: Through the analysis of the fossil morphological structures it is possible to deduce some interesting information about the organism habitat, mode of life and time period. For instance, the position of the keel, which represents the location of the siphuncle, clearly points to the placement of this cephalopod within the ammonoids clade rather then the nautiloides.
Killer Whales are marine animals that live in oceans all over the world. Although they live in many oceans, they seem to prefer coastal waters and cooler regions. The Killer Whale, sometimes called an Orca, sometimes enters estuaries, but doesn’t go far from the sea. Killer whales are one of the top predators in the sea. They are good hunters that eat a large variety of fish, squid, sharks, marine mammals (such as whales and seals), turtles, octopi, and birds (penguins and gulls).
Orcas, sperm whales, some large sharks and humans eat swordfish. The swordfish is the main predator of mostly anything it can get its sword on. Swordfish are carnivores and they eat squid, octopus, fish