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Hexapods have bodies ranging in length from 0.5 mm to over 300 mm which are divided into an anterior head, thorax, and posterior abdomen. [7] [8] The head is composed of a presegmental acron that usually bears eyes (absent in Protura and Diplura), [9] followed by six segments, all closely fused together, with the following appendages:
Oct 31, 2023 · Subphylum Hexapoda. The name Hexapoda denotes the presence of six legs (three pairs) in these animals, which differentiates them from the number of pairs present in other arthropods. Hexapods are characterized by the presence of a head, thorax, and abdomen, constituting three tagma. The thorax bears the wings as well as six legs in three pairs.
The Hexapoda have six legs (three pairs) as their name suggests. Hexapod segments are fused into a head, thorax, and abdomen (Figure 15.20). The thorax bears the wings and three pairs of legs. The insects we encounter on a daily basis—such as ants, cockroaches, butterflies, and bees—are examples of Hexapoda.
Hexapod. In subject area: Immunology and Microbiology. Hexapods are a well-established monophyletic group, based on the presence of three major body divisions—head, thorax, abdomen—and a single pair of locomotory appendages on each thoracic segment. From: Encyclopedia of Biodiversity (Second Edition), 2001.
- Introduction to Phylum Arthropoda
- Subphylum Chelicerata
- Subphylum Myriapoda
- Subphylum Hexapoda
- Subphylum Crustacea
The phylum Arthropodacontains a wide diversity of animals with hard exoskeletons and jointed appendages. Many familiar species belong to the phylum Arthropoda—insects, spiders, scorpions, centipedes, and millipedes on land; crabs, crayfish, shrimp, lobsters, and barnacles in water (Fig. 3.72). Arthropods are considered the most successful animals o...
Chelicerata (from the Greek word chela meaning claw) is the subphylum of arthropods that includes spiders, mites, scorpions, and horseshoe crabs. Unlike other arthropods, chelicerates lack antennae. They also do not have the mandible food processing appendages used by other arthropods for tearing and grinding food. They instead possess a set of cla...
The subphylum Myriapoda is represented by land-dwelling arthropods such as centipedes and millipedes. This group contains over 13,000 species. There are no known marine myriapod species. They have a single pair of antennae and mouthparts roughly similar to those found in chelicerates. The main distinguishing feature of myriapods is the multiple joi...
The class Insecta is another primarily terrestrial group of arthropods, although insects have been reported from nearly all environments with the exception of deep-sea habitats. Insects are the most diverse members of the subphylum Hexapoda (Fig. 3.77). Hexapods have a distinct body plan, which includes three large sections: a head, thorax, abdomen...
Most marine arthropods belong to the subphylum called Crustacea(Fig. 3.79). Most crustaceans live in the ocean, where they are so abundant that they are often called “insects of the sea.” Crabs, shrimp, and lobsters commonly live along the shoreline. Some species of shrimp, called krill, spend their lives as plankton, drifting in the surface waters...
May 29, 2023 · Hexapoda. (Science: zoology) The true, or six-legged, insects; insects other than myriapods and arachnids. The hexapoda have the head, thorax, and abdomen differentiated, and are mostly winged. They have three pairs of mouth organs, viz, mandibles, maxillae, and the second maxillae or labial palpi; three pairs of thoracic legs; and abdominal ...
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The presence of legs and wings on the thorax demonstrates that it is a tagma specialized for locomotory function, developed and controlled by muscles and ganglia situated in the thorax itself. It is probable that this locomotory function originated the differentiation of the thoracic tagma from the other two that form the body of the hexapods: the head and the abdomen (Figs. 42 – 47 ).
