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  THEORIES OF ORIGIN OF METAZOANS
  What are Metazoans? Metazoans can be define as multicellular organisms or as cellular animal or more accurately simply as animals.They are holozoic multicellular organisms. Which are develop from embryo. Their body cells are generally organized in tissues and organs. [exception, porifera have cellular level of organization and coelenterates have tissue level of organization.] There gametes… Read more: THEORIES OF ORIGIN OF METAZOANS
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  Species Concept
  What is a species? A group or class of animals or plants (usually constituting a subdivision of a genus) having a certain common and permanent characterstics which clearly distinguish it from other groups. BIOLOGICAL SPECIES CONCEPT REPRODUCTIVE ISOLATING MECHANISM PRE-ZYGOTIC POST-ZYGOTIC ECOLOGICAL HYBRID INVIABILITY TEMPORAL STERLITY BEHAVIORAL (barriers to isolation) REDUCED FITNESS OF HYBRID OFFSPRING… Read more: Species Concept
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  Environmental Limiting Factors
  Environmental Limiting Factors Limiting Factors – All living things need food, water, shelter and space to survive. As long as organisms have all of these things available to them their population will continue to grow. However, populations can not grow forever. Some form of environmental resistance will stop the population’s growth. The form of environmental resistance… Read more: Environmental Limiting Factors
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  ROTIFERA – STRUCTURE,LIFE HISTORY AND AFFINITIES
  The rotifera are wheel animalcules. They are microscopic, bilaterally symmetrical, free living aquatic animals and pseudocoelomate animals.
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  Holocephali – General organization and affinities
  Key Characters of Holocephali General organization of Holocephalians External Features of Holocephali Fins and Locomotion Digestive System Respiratory System Circulatory System Nervous System Urinogenital System Fertilization Eggs and Development Sensory Organs Affinities of Holocephali Resemblances with the Elasmobranchs Primitive Shark’s Features of Holocephali Modern Shark’s Features of Holocephali Resemblances with Dipnoi Resemblances with Teleosts Primitive… Read more: Holocephali – General organization and affinities
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  Lepisma (Silver fish)
  The genus Lepisma comprises primitive insects that belong to the family Lepismatidae and order Zygentoma. The silverfish (L. saccharinum), the most well-known species in the genus Lepisma, is a worldwide species that prefers moist environments, hides in cracks, and is typically found in human homes. In some cases, it can become a household annoyance. Although… Read more: Lepisma (Silver fish)
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  Galeodes
  Solifuges, or sun spiders, belong to the genus Galeodes. This genus has around 200 species that are distributed throughout Asia, southeastern Europe, and northern Africa. They are mostly nocturnal and found in dry environments, just like other solifuges. They are not as robust or as dark and contrastingly colored as some other solifuges, and they… Read more: Galeodes
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  Limulus (Horseshoe crab)
  The Atlantic horseshoe crab (Limulus polyphemus) is the only member of the genus Limulus that is still alive. Although several other species have been identified and subsequently assigned to other genera, the genus now has one fossil species credited to it. Classification of Limulus (Horseshoe crab) Phylum Arthropoda Jointed appendages. Class Arachnida Terrestrial or aquatic… Read more: Limulus (Horseshoe crab)
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  Araneus (orb-weaving spiders)
  Male spiders (Araneus) in this genus are typically 1⁄3 to 1⁄4 the size of females, making them possibly the most blatant example of sexual dimorphism in the whole orb-weaver family.
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  Palamnaeus (Scorpion)
  The predatory arachnids known as scorpions (Palamnaeus) have eight legs, two grabbing pincers, and a slender, segmented tail that always ends with a stinger and is frequently carried in a distinctive forward curve over the back.
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  Peripatus
  Peripatus is zoologically very interesting, because it exhibits both arthropod and annelid characters as under. Peripatus is supposed to be the connecting link between Annelida and Arthropoda.
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  Julus (millipede)
  The class Diplopoda, which derives its name from the Latin mille, which means “thousand,” and pes, which means “foot,” is the formal term for the group of arthropods known as Julus (millipedes).