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All these cranial appendages can serve for posturing, battling for mating privilege, and for defense. In almost all cases, they are sexually dimorphic, and are often found only on the males. One exception is the species Rangifer tarandus , known as reindeer in Europe or caribou in North America, where both sexes can grow antlers yearly, though ...
In the adult insect, the head capsule appears unsegmented, though embryological studies show it to consist of six segments that bear the paired head appendages, including the mouthparts, each pair on a specific segment. [7] Each such pair occupies one segment, though not all segments in modern insects bear any visible appendages.
[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 .
The fossils showed Arthropleura's head was roughly circular, with slender antennae, stalked eyes and mandibles - jaws - fixed under it. Arthropleura had two sets of feeding appendages, the first ...
Ancient swimming ‘taco’ had ‘bug jaws,’ new fossils show. Mindy Weisberger, CNN. July 30, 2024 at 2:49 PM ... These small, paired appendages near the mouth bite, hold and tear food, 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.
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 ...
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