rear the posterior thoracic air sac, in the middle the anterior thoracic air sac and in front the clavicular air sac, in that order gradually diminishing...

egg sacs, which maintain a fairly constant humidity level. In some species, the females die afterwards, but females of other species protect the sacs by...

identity of this sensor is not certain, but the nerve endings in the supranasal sac of these snakes resemble those found in other heat-sensitive organs. Russell's...

This article records new taxa of every kind of fossil archosaur that were scheduled to be described during 2023, as well as other significant discoveries...

in an internal brood sac, but Gymnolaemata both external membranous sacs, skeletal chambers (ovicells) and internal brooding sacs exist. The developing...

usually simple sacs, devoid of complex internal structure. In contrast, the lungs of lungfish are subdivided into numerous smaller air sacs, maximizing the...

air sacs In modern birds, pulmonary air sacs are thin-walled, translucent air-filled bags connected to the lung. Together with the lung, air sacs form...

female produces several egg sacs over a period of two to three months, from May to July, with approximately fifty eggs in each sac. The eggs hatch in about...

other taxa, making Ditrysia. More recently, findings of new taxa, larvae and pupa have aided in detailing the relationships of primitive taxa, phylogenetic...

it must meet certain quantitative criteria which are designed to classify taxa facing "a very high risk of extinction". An even higher risk is faced by...

unambiguous evidence of postcranial pneumaticity in the studied taxa, and argue that an air sacs system permeating the skeletons was not present in the earliest...

to 66%. TB infection begins when the mycobacteria reach the alveolar air sacs of the lungs, where they invade and replicate within endosomes of alveolar...

(morphological) features proving inadequate, and the question of whether traditional taxa are clades in doubt. The phylogeny proposed by Gale in 1987 is: The phylogeny...

no fruit is set. LSI can be pre-zygotic (e.g. deterioration of the embryo sac prior to pollen tube entry, as in Narcissus triandrus) or post-zygotic (malformation...

in a crescent-shape made of an enclosed nuchal organ. It has a canal of sacs in the coelom, lying in a continuous band. The anal and caudal shield (at...

This article records new taxa of fossil archosaurs of every kind that are scheduled described during the year 2021, as well as other significant discoveries...

prosauropods likely had abdominal and cervical air sacs, based on the evidence for them in sister taxa (theropods and sauropods). The study concluded that...

flexible. The genus Nothronychus can be distinguished from other therizinosaur taxa based on several features: a distinctly subcircular obturator process, an...

has been made for the taxa, the IUCN notes that it may be appropriate to give them "the same degree of attention as threatened taxa, at least until their...

canine, three premolars, and four molars, totaling 50 teeth. While some taxa, like the opossum, retain this original tooth count, others have reduced...

further development; in many species, this takes place within a pouch-like sac, the marsupium, located in the front of the mother's abdomen. This is the...

dromedary camel has an organ called a dulla in his throat, a large, inflatable sac that he extrudes from his mouth when in rut to assert dominance and attract...

from the Latin words cirritus "curly" from cirrus "curl" and pedis from pes "foot". The two words together mean "curly-footed", alluding to the animal's...

Millipedes (originating from the Latin mille, "thousand", and pes, "foot") are a group of arthropods that are characterised by having two pairs of jointed...

subpopulations (or stocks) are indicated. Where possible common names for taxa are given while links point to the scientific name used by the IUCN. There...

whether they differed between individuals is unknown. CT scans show that air sacs (pockets of air that provide strength for and lighten bones) were present...

lungs. Likely air was inflated into the lungs by contractions of a throat sac against the skull floor like in modern amphibians, which may be the reason...

neural spines along the spine of dicraeosaurids would have enclosed an air sac, the so-called supravertebral diverticulum, that would have been connected...

larvae remain in the nest for the next two to three days until their yolk sacs are fully absorbed. Afterwards, the fry leave the nest and the free-swimming...

enclosed an air sac, which would have been connected to the lungs as part of the respiratory system. In Dicraeosaurus, this air sac (the so-called supravertebral...