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Leishmania donovani- Habitat, Morphology and Life Cycle

November 25, 2020 by Laxmi Neupane

Systematic position Phylum: Protozoa Subphylum: Sacromastigophora Superclass: Mastigophora Class: Zoomastigophora Order: Kinetoplastida Genus: Leishmania Species: donovani Discovery and Distribution The species of Leishmania donovani was reported simultaneously by Leishmania from London and Donovan from Mardas in (1903) hence the name Leishmania donovani. L. donovani causes a malaria-like fever-oriental disease in the man …

Taenia solium- Classification, Habitat, Structure, Body wall

November 25, 2020 by Laxmi Neupane

Classification of Taenia solium Phylum Platyhelminthes Class Cestoda Subclass Eucestoda Order Taenioidea Genus Taenia Species solium Habits and Habitat of Taenia solium Taenia solium, also known as pork tapeworm, is found worldwide. Thus, its distribution is cosmopolitan. Its adults dwell in man’s small intestine as an internal parasite, i.e., endoparasitic, where it …

Earthworm- Reproductive System, Copulation, Cocoon formation

November 13, 2020 by Laxmi Neupane

Reproductive system of earthworm Earthworms do not reproduce asexually. Reproductive organs are somewhat complicated. The pheretima is monoecious or hermaphrodites having both male and female reproductive organs in the same individual. They cannot fertilize their own eggs because they are protandrous. Cross-fertilization occurs as a rule because of the relative position of …

Ascaris lumbricoides- Life cycle, pathogenicity, clinical manifestation

November 25, 2020November 13, 2020 by Laxmi Neupane

Life cycle of Ascaris lumbricoides In the life cycle of Ascaris, there is no secondary host. The life cycle of Ascaris is monogenetic as it involves only one host i.e. Man. Figure: Life cycle of Ascaris lumbricoides. Image Source: CDC. 1. Egg in feces The sexually mature female produces as many as …

Reproductive system of Ascaris lumbricoides

November 25, 2020November 13, 2020 by Laxmi Neupane

Reproductive system of Ascaris lumbricoides Only sexual reproduction occurs in Ascaris. Sexes are separate i.e., dioecious in Ascaris and these roundworms also show distinct sexual dimorphism. Males are smaller than the females and they also have a curved tail with pre and post anal papillae, cloaca, and a pair of spicules or …

Ascaris lumbricoides- Digestive, Respiration, Excretory, Nervous System

November 25, 2020November 13, 2020 by Laxmi Neupane

Digestive System of Ascaris lumbricoides I) Alimentary canal: It is a straight and complete tube that starts with the mouth at the anterior end and ends with the anus at the posterior end. It comprises a short pharynx or esophagus representing foregut, along intestine or mid-gut, and short rectum or hindgut. Figure: …

Ascaris lumbricoides- Habitat and External Morphology

November 25, 2020November 13, 2020 by Laxmi Neupane

Habitat of Ascaris lumbricoides Ascaris lumbricoides are the largest most familiar endoparasites of the man freely living in the lumen. It has also been reported from animals like pigs, cattle, sheep, and squirrels. It inhabits the small intestine of more frequently children than adults. It is cosmopolitan in distribution. Sometimes, it migrates …

Amoeba proteus- Nutrition, Respiration, Excretion, Osmoregulation

November 12, 2020 by Laxmi Neupane

Amoeba proteus- Nutrition, Respiration, Excretion and Osmoregulation

Nutrition of Amoeba proteus Food and selection of food Amoeba is carnivorous. It feeds by phagocytosis. The mode of nutrition is Zootrophic or holozoic. i.e. it requires ready-made (solid form) organic substances for food. The food consists of algal cells and filaments, bacteria, desmids, flagellates, ciliates, small metazoans such as rotifers and …

Amoeba proteus- Habitat, Culture and Structures

November 12, 2020 by Laxmi Neupane

Classification of Amoeba proteus Phylum: Protozoa Subphylum: sacromastigophora Superclass: Sarcodina Class: Rhizopodea Subclass: Lobosia Order: Amoebida Genus: Amoeba Species: proteus Habit and Habitat of Amoeba proteus Amoeba proteus is widely distributed and commonly found on the bottom mud or on the underside of aquatic vegetation in freshwater, ponds, ditches, lakes, springs, slow-running …

Reproduction in Paramecium

November 11, 2020 by Laxmi Neupane

Paramecium reproduces asexually by transverse binary fission and also undergoes several types of nuclear reorganization, such as conjugation, endomixis, autogamy, cytogamy, and hemixis, etc. 1. Transverse binary fission (Asexual reproduction) This is the commonest type of Asexual reproduction in Paramecium. It occurs during the favorable condition when food is available in large …

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