White sturgeon (Acipenser transmontanus) Introduction The white sturgeon is a unique freshwater fish species that plays a significant role in British Columbia’s cultural and social heritage‚ as well as our economy. The white sturgeon (Acipenser transmontanus) belongs to the sturgeon family Acipenseridae. Not only is it the largest sturgeon species in North America‚ it is also the largest freshwater fish species in North America. Physical appearance The white sturgeon has a slender‚ long body
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from the phylum arthopoda. Arthropods include more than 850‚000 species and form by far the largest phylum in the animal kingdom‚ exceeding in number all the other Phyla combined. The characteristic tough exoskeleton and jointed limbs are superimposed in a segmental body plan that reflects the evolution of arthropods from ancestors of the annelid worm. Insects‚ arachnids‚ myriapods and crustaceans are the major groups in this phylum (Nichols). Insects are the largest of this phylum and make
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Tapeworms are the dominant member of the class Cestoidea. They are ribbon-like‚ segmented creatures living in the intestines of their vertebrate hosts. There are a dozen orders in this class‚ most living in fish but two that use humans as hosts. Tapeworms cling to the intestinal wall of their hosts with suckers‚ hooks‚ or other adhesive devices. Having no mouth or gut‚ they receive their nourishment through their skin. Further‚ they have no type of sensory organs. White or yellowish in color‚ species
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The discovery of the Comb jelly which was the first animal fossil was a shocking and unexpected event to most scientists in the world. Scientists had a specific view about evolution. They thought that organisms evolve from a simple state to a more complex state. But that was not the case for the comb jelly which unlike what scientist thought was a very complex specie. It was so complex that it had a nervous system and tissues. But that was not the only misconception that they had to face. Another
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Cnidarians Cnidaria is a phylum containing some 11‚000 species of simple animals found exclusively in aquatic‚ mostly marine‚ environments. Cnidarians get their name from cnidocytes‚ which are special cells that carry stinging organelles. The corals‚ which are important reefbuilders‚ belong here‚ as do the sea anemones‚ jellyfish‚ sea pens‚ sea pansies and sea wasps. The names Coelenterata and Coelentera were once applied to the group‚ but those names included the Ctenophores‚comb jellies
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generally believed that the direct ancestor of the domestic dog is the wolf‚ originally found throughout Europe‚ Asia‚ and North America. Remains of a dog‚ estimated to be 10‚500 years old‚ have been found in Idaho. TAXONOMY Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Carnivora Family: Canidae Genus: Canis Species: Canis familiaris ECOLOGY & HABITAT Little is known about wild dogs of the past but that they are carnivores: hunters and scavengers. This means that they are secondary consumers
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UNIT I Diversity in the Living World CHAPTER 1 The Living World What is Living Diversity in the living world Taxonomic Categories Taxonomical Aids The living world is very wonderful. It contains wide range of life forms. 1.1 What is living – Living organisms are self-replicating‚ evolving and self-regulating interactive systems capable of responding to external stimuli. Living organisms exhibit following distinctive characteristics. All Living Organisms
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Linnaeus’s hierarchical system of classification includes seven levels. They are—from smallest to largest—species‚ genus‚ family‚ order‚ class‚ phylum‚ and kingdom Family- group of genera that share many characteristics Order- group of similar families Class- group of similar orders Several different classes make up a phylum The kingdom is the largest and most inclusive of Linnaeus’s taxonomic categories. Linnaeus named two kingdoms‚ Animalia and Plantae Carolus
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live in water and have gills‚ scales and fins on their body. 2. Amphibians are born in the water. When they are born‚ they breath with gills like a fish but eventually they will grow up and develop lungs and can live on land. 3. Arthropods is a huge phylum of animals. It includes 11 classes: Merostomata‚ Pycnogonida‚ Arachnida‚ Remipedia‚ Cephalocarida‚ Branchiopoda‚ Maxillopoda‚ Malacostraca‚ Chilopoda‚ Diplopoda‚ and Insecta.
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Characteristics of the Phylum Arthropoda The segmented bodies are arranged into regions‚ called tagmata (e.g.‚ head‚ thorax‚ abdomen). The paired appendages (e.g.‚ legs‚ antennae) are jointed. They posses a chitinous exoskeletion that must be shed during growth. They have bilateral symmetry. The nervous system is dorsal (belly) and the circulatory system is open and ventral (back). Arthropod Groups (taxa) The arthropods are divided into two large groups that exist today: The Chelicerates
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