A spiracle or stigma is the opening in the exoskeletons of insects, myriapods, velvet worms and many arachnids to allow air to enter the trachea. In the...

Spiracle or spiraculum may refer to: Spiracle (arthropods), opening in the exoskeletons of some arthropods Spiracle (vertebrates), openings on the surface...

respiratory system of insects (and many other arthropods) is separate from the circulatory system. Insects have spiracles on their exoskeletons to allow air to...

Dick Stigmata of the liver, a symptom of chronic liver disease Spiracle (arthropods), entrances to the respiratory system of some insects Stigmata, structures...

arrangement of spiracles. In this order, spiracles are arranged in a series down the middle of the centipede's back, whereas spiracles in all other centipedes...

present below the water line and fed on the carcass; with only their Spiracle (arthropods) protruding the surface. "Because insects are cold-blooded animals...

pieces of debris from damaging the delicate gills. A smaller opening, the spiracle, lies in the back of the first gill slit. This bears a small pseudobranch...

can live in human homes. It is an insectivore; it kills and eats other arthropods, such as insects and arachnids. In 1758, Carl Linnaeus described the species...

molluscs, nematodes and arthropods. One type of invertebrate respiratory system is the open respiratory system composed of spiracles, tracheae, and tracheoles...

Examples of exoskeletons in animals include the cuticle skeletons shared by arthropods (insects, chelicerates, myriapods and crustaceans) and tardigrades, as...

Neo-Latin centi-, "hundred", and Latin pes, pedis, "foot") are predatory arthropods belonging to the class Chilopoda (Ancient Greek χεῖλος, kheilos, lip,...

group of arthropods: all millipedes are more closely related to each other than to any other arthropods. Diplopoda is a class within the arthropod subphylum...

pairs on the abdomen on abdominal segments three and four, and an unpaired spiracle on the fifth abdominal segment. As embryos they also have opisthosomal...

pattern of a black stripe on each segment, that terminates at the spiracle (arthropods). Their dorsal side is darker green than their ventral side. This...

connected to the surroundings through a pair of spiracles, but in the majority of spiders this pair of spiracles has fused into a single one in the middle,...

Arachnids are arthropods in the class Arachnida (/əˈræknɪdə/) of the subphylum Chelicerata. Arachnida includes, among others, spiders, scorpions, ticks...

nervous systems of all arthropods, as all their ganglia are fused into one mass in the cephalothorax. Unlike most arthropods, spiders have no extensor...

altogether. Instead, its eyes have a single ocellus or a group of ocelli. Its spiracles are paired and can be found laterally. Every leg-bearing segment of this...

adjacent sclerotized parts by membranes. Each segment carries a pair of spiracles. The outer skeleton, the cuticle, is made up of two layers: the epicuticle...

upwards of 27 leg-bearing segments. They are eyeless and blind, and bear spiracles on all leg-bearing segments—in contrast to other groups, which usually...

to an atrial chamber which opens into a spiracle. Bristles hold the lamellae apart. A muscle opens the spiracle and widens the atrial chamber; dorsoventral...

πούς (poús) 'foot') are the members of subphylum Myriapoda, containing arthropods such as millipedes and centipedes. The group contains about 13,000 species...

exclusively through tracheae, which open laterally through two pairs of spiracles on the posterior margins of the sternites of abdominal segments 3 and...

taxa, the respiratory structures on the endopods are internal, with a spiracle and pseudotrachaea, which resemble lungs. In others, the endopod is folded...

homologous with the median ocelli of arthropods; this would suggest that the last common ancestor of arthropods may have only had median ocelli. However...

than in vertebrates. Insects have an open respiratory system made up of spiracles, tracheae, and tracheoles to transport metabolic gases to and from tissues...

in spiracle function, body size and metabolic rate. Gas exchange may occur through a single open spiracle, or the coordination of several spiracles. Spiracle...

gills. In species like the spiny dogfish and other sharks and rays, a spiracle exists near the top of the head that pumps water into the gills when the...

Adults are chemically defended, having a modified tracheal gland and spiracle on each side which squirts quinones which can poison or discourage a predator...

various class consisting of small animals, breathing through lateral spiracles, armed on all sides with a bony skin, or covered with hair; furnished...