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[1] [2] The beak may also be referred to as the mandibles or jaws. [3] These beaks are different from bird beaks because they crush bone while most bird beaks do not. Fossilised remains of beaks are known from a number of cephalopod groups, both extant and extinct, including squids , octopuses , belemnites , and vampyromorphs .
Jackknife chelicera are described in two different forms: orthognathous and labidognathous. Orthognathous chelicerae are articulated in a manner that enables movements of the appendages parallel to the body axis. This kind of chelicera occurs in the Liphistiomorphae and Mygalomorphae spiders and in the related orders Amblypygi, Schizomida and ...
The labial palps borne on the sides of labium are the counterparts of maxillary palps. Like the maxillary palps, the labial palps aid sensory function in eating. In many species the musculature of the labium is much more complex than that of the other jaws, because in most, the ligula, palps and prementum all can be moved independently.
Printable Crossword Puzzle: September 2017 We've used the names of Snow White's diminutive friends as clues in this crossword. How they are defined is up to you to determine. Here's a tip: If you ...
Mandibles are often simply called jaws. Mandibles are present in the extant subphyla Myriapoda (millipedes and others), Crustacea and Hexapoda (insects etc.). These groups make up the clade Mandibulata , which is currently believed to be the sister group to the rest of arthropods, the clade Arachnomorpha ( Chelicerata and Trilobita ).
Cephalopod appendages surround the mouth, so logically they could be derived from embryonic head tissues. [150] However, the "Arms as Foot" hypothesis, proposed by Adolf Naef in 1928, has increasingly been favoured; [ 149 ] for example, fate mapping of limb buds in the chambered nautilus indicates that limb buds originate from "foot" embryonic ...
Insect mandibles are a pair of appendages near the insect's mouth, and the most anterior of the three pairs of oral appendages (the labrum is more anterior, but is a single fused structure). Their function is typically to grasp, crush, or cut the insect's food, or to defend against predators or rivals.
[14]: 34 Besides this, all appendages and the body are separate from the pupal skin and enjoy a degree of independent motion. All other superfamilies of the Lepidoptera are more specialised, have non-functional mandibles, appendages and body attached to the pupal skin, and lose a degree of independent movement. [14]: 20