There is sometimes a well-developed dermal exoskeleton formed of small granules and plates of bone.
The exoskeleton generally has the form of horny plates, spines, or scales; while sometimes as in the Chamaeleons and Amphisbaenians it is absent.
The exoskeleton as in the Heterostraci consists of shields and scales, the shields being divisible into three layers.
In the Labyrinthodontia the dermal exoskeletonis in many genera greatly developed.
The exoskeleton of the dogfish is mainly composed of placoid scales, each of which consists of a little bony base imbedded in the skin, bearing a small backwardly-directed spine formed of dentine capped with enamel.
The exoskeleton in vertebrates is phylogenetically older than the endoskeleton, as is indicated by both palaeontology and embryology.
In some of them such as Stegosaurus the exoskeleton is strongly developed, in others such as Iguanodon it is absent.
The exoskeletonhas the form of cycloidal or rhomboidal scales.
The middle layer contains canals for the passage of blood vessels, but the exoskeleton shows no impressions of dermal sense organs.
Passing to the more detailed characters:--there is sometimes a well-developed exoskeleton having the form of bony plates or spines.
The exoskeleton of the Duck and indeed of all birds is entirely epidermal in origin.
Amongst the Invertebrata the most widely distributed type of exoskeleton is a cuticle formed on the outer surface of the epidermis, which reaches its highest development in the Arthropoda.
In the Vertebrata the two types of exoskeleton mentioned above are both found, but that developed on the inner surface of the epidermis is always associated with a dermal skeleton, and that on the outer side frequently so.
The test of Ascidians is an abnormal form of exoskeleton belonging to this type.
The type of exoskeleton developed on the inner side of the general epidermis is confined to the Pisces, where it appears as the scales; but a primitive form of these structures persists as the teeth in the Amphibia and Amniota.
Contrast the exoskeleton of the sea urchin and the starfish.
Pen#, a remnant of exoskeleton found in the squid.
Pen, a remnant of an exoskeletonimbedded in the mantle along the dorsal side.
Of what substance is the exoskeleton of arthropods composed?
To do this, first cut through the ventralexoskeleton from end to end with scissors, then with a sharp knife or razor cut through to the dorsal exoskeleton and cut that with the scissors.
Carapace, the continuous shell-like portion of the exoskeleton covering the cephalo-thorax.
The wasp larva feeds externally and devours the entire cockroach, including its exoskeleton (Ferton, 1894).
Pupation occurs inside the exoskeletonof the cockroach.
This exoskeleton differs from the main or axial skeleton of the higher animals, the latter being inside of the body.
The exoskeleton is dead, being secreted by the cells lining the body, while the endoskeleton is, in part at least, alive and is capable of growth, e.
This is the more remarkable, as the well-marked ventral and dorsal shields of many of the ancient Teleosauria would lead one to expect a corresponding exoskeleton (if anywhere) in their nearest allies, the modern Gavialidae.
The attempt to discover the limits within which this remarkable exoskeleton is to be found, led me to look, more critically than I had previously done, into the arrangement and specific characterization of the recent Crocodilia.
Audouin’s laborious researches into the exoskeletonof Insects[37] resulted in a nomenclature which has been generally adopted.
The elements of the thoracicexoskeleton are simpler in the Cockroach than in Insects of powerful flight, where adaptive changes greatly obscure the primitive arrangement.
The chitinous exoskeletonis rather an exudation than a true tissue.
Craphound hunched opposite me, his exoskeletonlocked into a coiled, semi-seated position.
Holding it, I smelled the lubricant from his exoskeleton and the smell of the attic it had been mummified in before making its way into his hands.
Craphound's exoskeleton levered him into the seat, and I watched the eerily precise way it executed the macro that started the car, pulled the shoulder-belt, put it into drive and switched on the stereo.
Craphound's exoskeleton executed another macro and slid the panel-door aside, revealing the cowboy trunk.
The body-wall of the sea-urchin shows very well the exoskeleton composed of plates on which are borne movable strong spines.
There are in some batrachians traces of an exoskeleton in the presence of scale-like structures in the skin or in the horny nails on the digits, but these cases are rare.
This outer body-wall or exoskeleton may bear many tubercles or spines.
This chitinous cuticle or exoskeleton serves as an armor or protective covering for the soft body within, and also as a point of attachment for the many muscles of the body.
In an hour the wings are dry and the new chitinized exoskeleton firm enough for flying, or crawling about, and in another hour the locust begins to eat.
This exoskeleton serves not only to enclose and protect the soft parts of the body but also for the attachment of the body muscles.
I did mention it to my counselor, The Amazing Robotron, so-called for the metal exoskeleton he wore to support his fragile body in Earth's hard gravity.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "exoskeleton" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: anatomy; bones; carcass; frame; skeleton
