What is the Placoid Scale? Placoid scales, also known as dermal denticles, are a type of scale that is found on the skin of cartilaginous fishes such as sharks, rays, and skates. These scales have a flattened, plate-like shape and…
Scoliodon, commonly known as spiny dogfish, is a species of shark found in the coastal waters of many countries. Like other sharks, Scoliodon reproduces sexually, with internal fertilization. The male shark uses its pelvic fins, which are modified as reproductive…
Amoeba proteus is a single-celled organism. It is a eukaryotic organism, which means that it has a true nucleus and other membrane-bound organelles. Amoeba proteus is a freshwater organism that is commonly found in ponds, lakes, and streams. It is…
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Leishmaniasis is a disease caused by Leishmania donovani. It has two hosts. Man is the primary host and sandfly is the secondary or intermediate host. When a sandfly bites an infected man, it takes amastigote form of Leishmania from the…
In the life cycle of Leishmania donovani, it has two hosts and they are human and sandfly. Leishmania donovani causes visceral leishmaniasis in man which is also known as Kala-azar or Dumdum fever. It is an important pathogenic zooflagellate genus…
In this article, we will learn the morphology or structure of Leishmania donovani. Leishmania donovani is a parasite that causes Visceral Leishmaniasis in humans. It has a characteristic elongated, thin, and spindle-shaped morphology, with a length of around 20-30 μm…
Sleeping sickness, also known as African trypanosomiasis, is a tropical disease caused by trypanosome parasites transmitted to humans through the bite of infected tsetse flies. The symptoms include fever, headache, joint pain, and itchiness, followed by disturbed sleep patterns and…
Trypanosoma gambiense is a species of parasite that causes African trypanosomiasis, also known as sleeping sickness. The life cycle of Trypanosoma gambiense involves two distinct developmental stages: one is found in the bloodstream of man and the another stage is…
The basic morphology of Trypanosoma gambiense is that of a single-celled organism, known as a protozoan. It has a characteristic elongated, cigar-shaped body, with a distinct anterior and posterior end. The body is surrounded by a plasma membrane, which encloses…
In this article, we will learn the life cycle of Ascaris lumbricoides. What is the life cycle? The life cycle refers to the sequence of developmental stages that an organism goes through from its initial formation to its reproduction. It…
In this article, we will learn about the reproduction of Euglena. The method of reproduction of Euglena is asexual. Asexual reproduction occurs through binary fission, where the cell divides into two daughter cells. They can also reproduce by forming cysts…
The digestive system of Columba livia, also known as the rock pigeon, is similar to that of other birds. Food enters the mouth and is mashed by the beak and tongue before being swallowed and entering the oesophagus, stomach, small…
Air sacs of pigeon are 9 in number that are located in various parts of their body, including their head, neck, chest, and abdomen. What are the air sacs in birds? The air-sacs are bladder-like structures that are formed by…
Syrinx is the sound-producing organ in birds. The vocal organ or voice box or singing organ of birds is the syrinx. Syrinx also is known as pan-pipes and it is a bony structure. It is located at the posterior end…
