noun
Examples of appendages in a Sentence
The appendages of the body are reduced to branchiae, present in certain forms. A clitellum is present.
The various types of appendages described in the foregoing may be arranged in groups termed cormidia.
Thus from the original planula three appendages are, as it were, budded off, while the planula itself mostly gives rise to coenosarc, just as in some hydroids the planula is converted chiefly into hydrorhiza.
In the first place the cormus has been regarded as a single individual and its appendages as organs.
The Siphonula produced buds on the manubrium, as many Anthomedusae are known to do, and these by reduction or dislocation of parts gave rise to the various appendages of the colony.
The second type of differentiation is that between supporting axis and assimilating appendages.
The cells of the axis are commonly stouter and have much less chlorophyll than those of the appendages (Draparnaldia).
Russia has no oceanic possessions; her islands are all appendages of the mainland to which they belong.
In the Orthorrhapha, in the pupae of which the appendages of the perfect insect are usually visible, the pupa-case generally splits in a straight line down the back near the cephalic end; in front of this longitudinal cleft there may be a small transverse one, the two together forming a T-shaped fissure.
Where locomotive appendages (the parapodia of the Polychaeta) exist, they are never jointed, as always in the Arthropoda; nor are they modified anteriorly to form jaws, as in that group.
Appendages of body re „ duced to branchiae, present only in four species, and - - to the ventral copulatory 32 appendages of Alma and Criodrilus.
Mantle with two posterior appendages; ctenidium large and capable of protrusion from pallial cavity.
Shell spiral; four cephalic tentacles; eyes absent; two pedal appendages.
Head much flattened and wide, with eyes on sides; foot broad; siphon with internal appendages.
Dorsal respiratory appendages frequently present.
No anterior tentacles, and no dorsal appendages; body laterally compressed, transparent; pelagic. Phyllirhoe.
Head broad, surrounded by a funnel-shaped velum or hood; no radula; dorsal appendages foliaceous.
Anterior tentacles forming a scalloped frontal veil; dorsal appendages and tentacles similarly ramified.
Dorsum furnished on either side with papillae, at the base of which are ramified appendages.
Body elongated; visceral mass marked off from foot posteriorly; dorsal appendages absent, or reduced to a single pair; spicules in the integument.
The head of an insect carries usually four pairs of conspicuous appendages - feelers, mandibles and two pairs of maxillae, so that the presence of four primitive somites is immediately evident.
The compound eyes of insects resemble so closely the similar organs in Crustaceans that there can hardly be reasonable doubt of their homology, and the primitively appendicular nature of the eyes in the latter class suggests that in the Hexapoda also they represent the appendages of an anterior (protocerebral) segment.
The maxillae of the hinder pair become more or less fused together to form a " lower lip " or labium, and the segment of these appendages is, in some insects, only imperfectly united with the head-capsule.
Paired processes on the eighth and ninth abdominal segments may be specialized as external organs of reproduction, but these are probably not appendages.
It does not appear to represent a pair of appendages, but the maxillulae of the Aptera become closely associated with it.
Smaller appendages (such as the stylets of male cockroaches) may be carried on the ninth segment.
The labrum and clypeus are developed as a single prolongation of the oral piece, not as a pair of appendages.
The antennal segment apparently entirely disappears, with the exception of a pair of appendages it bears; these become the antennae; it is possible that the original segment, or some part of it, may even become a portion of the actual antennae.
Comstock and C. Kochi believe that the labrum belongs to it,, The appendages of the posterior three or trophal segments become the parts of the mouth.
The appendages of the two maxillary segments arise as treble instead of single projections, thus differing from other appendages.
From these facts it appears that the anterior three divisions of the head differ strongly from the posterior three, which greatly resemble thoracic segments; hence it has been thought possible that the anterior divisions may represent a primitive head, to which three segments and their leg-like appendages were subsequently added to form the head as it now exists.
Great difference of opinion exists as to the hypopharynx, which has even been thought to represent a distinct segment, or the pair of appendages of a distinct segment.
Though the T hx, thoracic segments bear the wings, no trace of these appendages exists till the close of the embryonic life, 8 `' nor even, in many cases, till much later.
The appendages of the abdomen are called cerci, stylets and gonapophyses.
Difference of opinion as to the nature of the abdominal appendages pre vails.
The neuromeres are shown in Arabic, the appendages in Roman numerals.
The air-tubes, like the food-canal, are formed by invaginations of the ectoderm, which arise close to the developing appendages, the rudimentary spiracles appearing soon after the budding limbs.
We may conclude, therefore, that they were preceded, in Cambrian times or earlier, by Arthropods possessing well developed appendages on all the trunk-segments.
Berlese, Gli Insetti (Milan, 1906), &c. (Extensive bibliographies will be found in several of the above.) Head and Appendages.
There are no exterior appendages of any kind.
Again, the adult Pentastomum shows no trace of appendages, unless the two pairs of chitinous hooks are to be regarded as the vestiges of jaws or ambulatory limbs.
Hard by immense catacombs and columbaria have been opened which may have been appendages of the temple.
Interior of dorsal valve, showing muscular impressions and labial appendages.
In the Rhynchonellidae there are two short slender curved laminae, while in many genera and even families, such as the Productidae, Strophomenidae, Lingulidae, Discinidae, &c., there exists no calcified support for the labial appendages.
Interior of dorsal valve, to show the position of the labial appendages.
The various comparisons previously made between the structure of Limulus and the Eurypterines on the one hand, and that of a typical Arachnid, such as Scorpio, on the other, had been vitiated by erroneous notions as to the origin of the nerves supplying the anterior appendages of Limulus (which were finally removed by Alphonse Milne-Edwards in his beautiful memoir (6) on the structure of that animal), and secondly by the erroneous identification of the double sternal plates of Limulus, called " chilaria," by Owen, with a pair of appendages (7).
The first pair of foliaceous appendages in each animal is the genital operculum; beneath it are found the openings of the genital ducts.
The second pair of mesosomatic appendages in Scorpio are known as the " pectens."
The next four pairs of appendages (completing the mesosomatic series of six) consist, in both Scorpio and Limulus, of a base carrying each 130 to 150 blood-holding, leaf-like plates, lying on one another like the leaves of a book.
There is no doubt that these are parapodial or limb appendages, carrying numerous imbricated secondary processes, and therefore comparable in essential structure to the leaf-bearing plates of the second meso somatic somite of Limulus.