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Hexapods are named for their most distinctive feature: a three-part body plan with a consolidated thorax and three pairs of legs. Most other arthropods have more than three pairs of legs. [5] Most recent studies have recovered Hexapoda as a subgroup of Crustacea. [6]
The abdomen in a primitive state contains 11 segments, a telson or homologous structure, and in some cases, weak legs. All winged arthropods are hexapods (most living species of insects in some life stage), but some groups of hexapods lack wings in all life stages (e.g., Collembola).
Hexapoda Characteristics. Ø A large taxa, includes insects and a small group of wingless arthropods. Ø Body plan: 3 parts, head, thorax and abdomen. Ø Head with six segments. Ø Thorax with three pairs of jointed legs (hence the name hexapoda) Ø Head bears a presegmental acron. Ø Acron bears compound eyes.
- Introduction
- Evolution and Fossil Record
- Hexapod Phylogeny
- Hexapods as Uniquely Terrestrial
- Descriptions
While crustaceans are the dominant group of arthropods in marine environments, hexapods, including insects, rule the land. Their dominance among animals is evident in their numbers of species, with over 750,000 described (Wilson, 1988), as well as biomass (e.g. Fittkau and Klinge, 1973). As the name indicates the Hexapoda have six legs, one pair pe...
The oldest well-known fossil hexapod is called Rhyniella praecursor, a collembolan from the Early Devonian-age Rhynie Chert. This and other small, wingless forms may have been an important part of the early terrestrial ecosystem, mainly detritivores foraging in soil and plant litter (the most primitive of the true insects, the Thysanura or silverfi...
Morphological and embryological evidence points to the Hexapods being related most closely either to the Myriapods; molecular sequencing and some morphology however argues for Crustaceaas the sister group; molecular evidence alone - but not morphology!, - has Crustacea as the parent clade MAK020507, 120515 The position of Diplura in the hexapods is...
All known recent and fossil hexapods are air breaters. The few aquatic insects are usually able to live in the water by trapping air bubbles against their spiracles (respiratory openings). This shows that they developed from an arthropod group that was already breathing air, although the precise ancestry remains uncertain, as no transitional fossil...
Hexapoda Phylogeny: Mandibulata : Myriapoda + (Crustacea + * : (Protura + Collembola) + (Diplura + Insecta)))) Comments: The most distinctive feature of the hexapods is the reduction in walking appendages to six, with three body segments consolidating to form the thorax, which provides much of the locomotory ability of the animals. (n contrast to o...
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
Oct 31, 2023 · Hexapods are characterized by having three distinct tagma, or body segments. This beetle is just one of over one million different species of insects that inhabit the Earth. Subphylum Myriapoda
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 ...
