Porifera – The Biology of Sponges

This article reveals the Biology of Sponges (phylum Porifera) by studying the Morphology, Anatomy, Histology, and Physiology of Sponges. The author has also included the Reproduction and Development of Sponges.


Porifera
is a phylum comprising of the multi-cellular invertebrate animals called Sponges. The term “Porifera” literally means “Pore Bearers”. The animals of this phylum have tiny pores in their body walls, and this characteristic feature is the basis of the name of this phylum.


Porifera includes very primitive multi-cellular animals having only the cellular level of body organization with no tissues and organs. In Porifera (sponges), only cells show division of labor for the purpose of performing specialized functions. All Poriferans, animals of the phylum Porifera, are aquatic with most of them being marine. Sponges are sessile (not mobile) organisms including both solitary and colony-forming types.

Sycon or Scypha adidarwinian

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The Hedgehog – the Spiny Ball!!

The Hedgehog – the Spiny Ball!!


A Piece of Poetry, from the Pen of an Earnest Biologist (Aditya Sardana aka Adidarwinian), dedicated to The Hedgehog – the Spiny Ball!!


“Look out under the log,

There lives a hedgehog,
It does not appear when the Sun shines,
Only to appear in the night as a ball of spines.”


Hedgehogs are found in the Europe, Africa, and Asia. Hedgehogs are the insectivorous (feeding on insects; insectivores) animals belonging to the subfamily Erinaceinae of the family Erinaceidae of the order Erinaceomorpha of the class Mammalia. Other members of the family Erinaceidae include the gymnures (subfamily Galericinae). The name “hedgehog” comes from its occurrence in the hedges or hedgerows, the pig-like (hog-like) snout, and the pig-like deep guttural sound made by it while searching for food.

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