INVERTEBRATES

Invertebrates

Invertebrates

Introduction

The world is an amalgamation of numerous appealing, fascinating and marvel creations and beings. The beauty of the world lies in the fact that it is not a monotonous place comprising of a single entity, with respect to the beings and numerous other species. The most captivating and astounding aspect of the earth is the nature. The life and the occurrence in this world are full of distinctive creatures, and each creature possesses unique characteristics, which add to their exclusivity. A naïve individual is generally just aware of the wonders associated with the features possessed by human beings, but if an individual heed to the other creation of nature, it will be dawned upon him, that each creature is a marvel in itself. Amongst the numerous marvelous creations of nature are the Invertebrates. This paper thoroughly discusses the Invertebrates, their characteristics and properties, which make them unique, successful and abundant animals (Nancy, et. Al., 2003, pp. 98-112).

Invertebrates

The most common feature that the researches have defined in regard to the Invertebrates is the fact that this group encompasses of such animals that lack a backbone. This group comprises of almost 97 % of all animals ever discovered on earth. Animals or species, which are excluded from this group, are fish, mammals, reptiles, amphibians and even birds. Amongst the interesting feature, of Invertebrates, is a feature that this class tends to build and construct a paraphyletic group. The Invertebrates possess a common ancestor, comprising of numerous cells, known as eukaryotic ancestor.

The term, Invertebrates is derived from the term vertebrate that ties “in” as a prefix, forming the meaning “without vertebrate”. As the meaning indicates that Invertebrates lack the internal skeleton, which is made up of a bone, most of these Invertebrates constitute of liquid filled hydrostatic skeleton, for instance, the jelly fish. However, the other class or group of Invertebrates, are the one which possess a rather hard and solid exterior, in the form of a shell, for instance the various insects (Kalman, 2008, pp.24-29).

The invertebrates are not confined to a single group or class. They comprise of numerous types and classes, and each class is based on the distinct features its constituents possess. Amongst the common classes or groups of Invertebrates are protozoa, arthropods, echinoderms, annelids and mollusks. Amongst them, the class or group earring insects is called Arthropods. The insects belonging to this group not only posses an outer hard shell but also the articulated legs along with the segmental bodies. The biggest group of Invertebrates is represented by the Invertebrates. Arthropods constitutes of insects, which are butterflies, beetles and fleas, as well as myriapods that include millipedes and centipedes. Another section of Arthropods constitute of crustaceans and arachnids, which may include crabs, lobsters, ticks, spiders and scorpions (Barnes, Fox & Ruppert, 2003, pp. 36-43).

Amongst the major distinction, between vertebrates and Invertebrates, is that of the presence of backbone and organization of their bodies, apart from that, these two major classes of animal species are quite similar in characteristics and ...