Sarcodines

Sarcodines are the class of protozoan protists having streaming cytoplasm and they use temporary cytoplasmic extensions called pseudopodia.

Pseudopodia help them in locomotion i.e., amoeboid movement and to capture food.

Examples of sarcodines are Mastigamoeba, Amoeba proteus, Actinophrys.

Mastigamoeba is a protozoan protist which lacks mitochondria.

It represents intermediate stage between flagellates and sarcodines.

Mastigamoeba comprises of amoeboid cells, along with a flagellated basal body.

It usually lacks mitochondria and possesses mitochondria related organelle, like mitosomes.

Mastigamoeba follows the holozoic mode of nutrition.

Reproduction occurs in Mastigamoeba by the method of longitudinal binary fission.

Amoeba proteus is considered as an animal-like protozoan protist. It is a single celled organism, which follows the holozoic mode of nutrition. It generally found in the fresh-water bodies containing decaying organic matter. Amoeba reproduces by the method of binary fission.

Actinophrys (also called sun animalcule) is a protist which possesses numerous pointed axopodia.

It generally reproduces asexually. It is generally found in the freshwater bodies and sea water bodies.

Generally, reproduction occurs in Actinophrys by binary fission with or without the formation of cyst.

However, Actinophrys heliozoa reproduces sexually by autogamy i.e., paedogamyin encysted condition.

Actinophrys heliozoa undergoes encystment.

Thereafter, it divides into two diploid cells called gamonts inside the cyst wall. Then, gamonts carry out two meiotic divisions.

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