o Stratum basale- These cells are the deepest coating of the epidermis because it is near the dermis. The cells are also attached to the dermis. o Stratum spinosum and stratum granulosum - Both layers are filled with keratin. When the cells leave the granulosum, they drop off and make a way for the stratum lucidum. However, the spinosum is composed of pre-keratin, and the granulosum has cells that are dying because they are far away from the dermal.
But Selachins has 6 pairs of aortic arches. In Scoliodon (sharks) only 5 pairs of aortic arches are present because the first pair is degenerated or develops into non functional gills. The progressive reduction of aortic arches in different species was observed. Bony fish and Chondrichthyes: The bony fish have single systemic circuit. Bony fishes are also called as telosts.
Introduction: Isopods are crustacean, which is split into smaller groups, called order. Scientifically Isopoda order is called isopods, which include pill bugs and sow bugs (Crustacean class). Most of the time isopods are mistaken for “bugs” since they look like insects. Even though they are closely related to crustaceans, their bodies are particularly similar to crab and other sea creature with shells. The isopods have three distinct regions such as the head, thorax and abdomen (CISEO).
The epidermis protects the body from damage and acts as barrier to prevent the loss of water and the entry of pathogens.The epidermis is the outer layer of the skin. Cells in the Malpighian layer are constantly dividing by mitosis to produce new epidermal cells, with dead skin cells falling off by the tens of thousands each minute. As the new cells are being pushed out through the granular layer, they produce a waterproof protein called keratin which is in your
Apart from this, the body temperature is regulated and the moisture content in the body is also regulated to a certain extent by the skin. The skin is made up of three layers and all the layers have a key role in acting as the defense. The outermost layer which is the epidermis is an actively regenerating layer. This layer keeps on growing and differentiating to maintain the pH and moisture content. The epidermis does not work alone in keeping the skin healthy.
Weedy Seadragon (Phyllopteryx taeniolatus) Introduction: The weedy seadragon, Phyllopteryx taeniolatus, is the only member of the genus Phyllopteryx and family Syngnathidae which is also known as common seadragon or Lucas' Sea-dragon. The family includes also seahorses, pipefish and pipe horses. Weedy seadragons are one of only two living species of seadragons, the second is known as the leafy seadragon (Phycodurus eques). The weedy seadragons can live for up to 10 years in the wild. The species has been selected as marine emblem of the Australian State of Victoria since 2002.
The Dermis is the second layer of skin. It is located below the Epidermis and contains our hair follicles (which sprout on the Epidermis). The Hypodermis is the lowest and largest layer, containing fat and connective tissues. The different types of sensory receptors through the skin allow us to sense contact. These receptors provide important information to the brain through sensory neurons.
Sirenia is a small order consisting of two major families namely Dugongidae and Trichechidea. The family Trichechidea has three species namely : West Indian Manatees (Trichechus Manatees) , African Manatees ( Trichecus senegalensis ) , Amazonian manatees (Trichechus inunguis). There is stand out surviving part of family Dugongidae, dugongs (Dugong dugon). They are large aquatic mammals with tapering to paddle like dorsoventrally flattened bilobed tails .The order Sirenia is based on sirens i.e " seanymphs " and " sea cows " and it is a school of thought that mermaid meets have originated from these animal .My assignment will focus on the systematics,the various systems and their role in ecosystem. HABITAT
Introduction: In vertebrates, the skin is made up of two layers: the outer epidermis and inner dermis. The epidermis, being the outermost layer, functions as a protective barrier between the external environment and the internal organs of the body, thereby protecting the internal organs from external stresses such as pathogens, toxins, water loss, chemical and physical stresses, etc.1 A majority of physical stresses that the epidermis experiences are in the form of spring forces, osmotic pressure, tensional forces, surface tension, sheer stress, etc.. Mechanical forces are generated in part through external physical assaults and in part through dynamics of the internal cytoskeletal machinery like actin, tubulin and intermediate filaments,
Hair roots, hair follicles and hairs 6. Sebaceous gland The dermis is structurally divided into two main areas: a superficial area (adjacent to the epidermis), called the papillary region, and a deep thicker area known as the reticular region10, 11. Papillary region: The papillary region is composed of loose areolar connective tissue. It is named after its fingerlike projections called papillae which extend toward the epidermis. The papillae projecting into the epidermis in the palms, fingers, soles, and toes, forms contours in the skin's surface, which are called friction ridges.