Dictionary > Isopod

Isopod

Definition
noun, plural: isopods
Any of the members of the order Isopoda, which is a taxonomic group characterized mainly by having a dorsally flattened, segmented body covered with a rigid exoskeleton, thoracic limbs of identical morphology and orientation, and abdominal limbs involved in gas exchange
Supplement
Isopods are crustaceans that include woodlice and many other related species. Some of them are parasites of crabs and shrimps. Most are aquatic, found in the sea and in freshwater. There are also terrestrial species, living in moist, cool habitats. They belong to the order Isopoda of the subphylum Crustacea.
The isopods are characterized by having a dorsally flattened body covered with a rigid exoskeleton. They do not have a carapace but only a protective shield on the head. The head (called a cephalon) bears unbranched antennae. Some of the isopods have two pairs of antennae; the first pair is vestigial in terrestrial isopods. The pereon (thorax) has eight pereonites (thoracic segments); the first segment though is fused with the head. The seven segments bear a pair of pereopods (thoracic limbs). As for the pleon (abdomen), there are six pleonites (abdominal segments). The first five of the pleonites bear a pair of pleopods (i.e. abdominal limbs involved in respiration). The pelopods of aquatic isopods serve as gills and are used for propulsion. The last segment of the pleon bears a pair of uropods.
Some isopods are detritus feeders whereas others are parasites of fish, crabs and shrimps.
Scientific classification:

  • Kingdom: Animalia
  • Phylum: Arthropoda
  • Subphylum: Crustacea
  • Class: Malacostraca
  • Order: Isopoda

See also:

  • woodlouse
  • sea roach


    You will also like...

    Ecological Research Measuring & Analysis
    Ecological Research: Measuring & Analysis

    This lesson is about the methods used for ecological research, such as quadrat and transect sampling, canopy fogging, an..

    Human perception in action
    Human Perception – Neurology

    This tutorial investigates perception as two people can interpret the same thing differently. Know more about human perc..

    Cells in different stages of meiosis
    Meiosis – The Genetics of Reproduction

    Meiosis is a form of cell division that creates gametes. It is comprised of two divisions that in the end, the resulting..

    Human gastrointestinal tract
    Human Biology – Food and Digestion

    This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..

    Sugar Homeostasis
    Sugar Homeostasis

    The blood sugar level is regulated by two hormones. The mechanism behind this type of negative feedback control is descr..

    Plant meristem
    Plant Meristems and Growth

    In plants, growth occurs in meristems, which are the site of repeated cell division of unspecialized cells. These cells ..