Question Video: Classifying an Arthropod by Identifying Characteristics from a Photograph | Nagwa Question Video: Classifying an Arthropod by Identifying Characteristics from a Photograph | Nagwa

Question Video: Classifying an Arthropod by Identifying Characteristics from a Photograph Science • First Year of Preparatory School

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The figure shows a member of the animal kingdom. To which arthropod subgroup does it belong?

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Video Transcript

The figure shows a member of the animal kingdom. To which arthropod subgroup does it belong?

This question is asking us to identify the subgroup of arthropods that this animal belongs to. To answer this question correctly, let’s review some key features of arthropods and how they are further split down into smaller groups.

Taxonomy is the science of classifying organisms into hierarchical groups according to their shared characteristics. Hierarchical grouping means that we start with larger groups, such as the kingdoms. Here, we will start with the animal kingdom. Animals are then split into vertebrates, those with a backbone, and invertebrates, those without a backbone. The invertebrates and vertebrates then break up into smaller groups, which then break down into smaller groups, and so on, until we end up with a very small groups called species.

The arthropods is the largest group of invertebrates. Arthropods have an exoskeleton, a body made up of segments and jointed appendages. Appendages are parts that stick out, such as legs and antennae. An exoskeleton is a rigid covering found on the exterior of some animals. It provides structural support and also protects the tissues and organs underneath. The arthropods can be split down further into smaller subgroups. The number of legs the arthropod has helps determine which subgroup they belong to. Insects, for example, have six legs and a body made up of three segments, called the head, thorax, and abdomen. The legs, and usually one or two pairs of wings, are attached to the middle section, the thorax.

Another subgroup is the arachnids. These have four pairs of legs. Their body is split into two segments: the cephalothorax, to which the legs are attached, and the abdomen. The arachnids include spiders and scorpions. Myriapods have a body made up of many segments, and they have a pair of legs on most of these. This means they can have an awful lot of legs. Centipedes and millipedes belong to this subgroup. Centipedes have between 34 and 354 legs, and millipedes have up to 750.

If we look at the picture in the question, which is a picture of a scorpion, we can count the number of legs it has. This is the easiest way to determine which subgroup it belongs to. We can only count down one side of it, but this will give us the number of pairs of legs it has. We can see this animal has four pairs of legs. Therefore, the correct answer to this question is, the arthropod subgroup that this animal belongs to is the arachnids.

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