Mandibles rarely present, adapted for piercing; first maxillae with palps; second maxillae forming with hypopharynx a suctorial proboscis.
Mandibles present in pupa, vestigial in imago; maxillaesuctorial without specialization; first maxillae with lacinia, galea and palp.
The specialization of form in the constricted abdomen and in the suctorial "tongue" that characterizes the higher families of the order is correlated with the habit of careful egg-laying and provision of food for the young.
There seems no doubt that the suctorial mouth-organs of the Diptera have arisen quite independently from those of the Lepidoptera, for in the former order the sucker is formed from the second maxillae, in the latter from the first.
This powerful suctorial apparatus is innervated entirely by the trigeminal nerve, so that here in its muscular arrangements any original segmental arrangement of the muscles of mastication might be expected to be visible.
At transformation these muscles proliferate and develop enormously, and form the bulk of the large basilar muscle which {308}surrounds the throat ventrally and laterally, and is the most bulky muscle in the suctorial apparatus.
The clue, then, to the origin of the suctorial apparatus and of the nature of the original organs supplied by the trigeminal is afforded in this case, as in all other similar inquiries, by the central nervous system and its outgoing nerves.
In the adult Petromyzon the trigeminal nerve innervates specially a massive suctorial apparatus, by means of which it holds on to other fishes, or to stones in the bottom of the stream.
If, of course, its suctorial mouth had arisen from an ancestral gnathostomatous mouth, then the argument would have more force.
But as the olfactory nerve is double in both cases, it is possible that the peculiar form of the nose in the actual Cyclostomes is a secondary acquisition (by adaptation to suctorial habits).
It seems that this habit was very widespread among the earlier Vertebrates; the larvae of many of the Ganoids and frogs have suctorial disks near the mouth.
Behind the eye there is a row of seven gill-clefts visible on the left, in front the round suctorial mouth.
They live in the sea, usually as parasites of fishes, into the skin of which they bore with their round suctorial mouths and their tongues, armed with horny teeth.
To the aquatic type his love of maritime adventure very readily assimilates him; and how far the suctorial is represented in his nature it is hardly necessary to say.
Next come the order of waders, who impart their quota to the perfection of the crow by giving it great powers of flight, and perfect facility in walking, such being among the chief attributes of the suctorial order.
The mouth parts are adapted for piercing, and are enclosed in a suctorial proboscis.
More definitely parasitic are the species of AEga and allied genera, which have piercing and suctorial mouth parts, and suck the blood of fish.
All these parts are overtopped by thesuctorial labium (Lm), which has a two-lobed expansion at the end.
In the singular suctorial mouth of Moths and Butterflies we observe, first of all, the great development of the maxillæ.
Defn: Capable of adhering by suction; as, the suctorial fishes.
Defn: Adapted for sucking; living by sucking; as, the humming birds are suctorial birds.
It has a suctorial mouth, with labial appendages, and a single pair of gill openings.
Defn: Any one of numerous species of pulmonate arachnids of the order scorpiones, having a suctorial mouth, large claw-bearing palpi, and a caudal sting.
In the paddles of the gigantic extinct sea-lizards, and in the mouths of certain suctorial crustaceans, the general pattern seems thus to have become partially obscured.
In this category one must place all such suctorial annelids as affix themselves to hosts for a longer or shorter period.
Thus the mandibles of a caterpillar are, by adaptation to another mode of nourishment, exchanged at a later period of life for a suctorial organ.
In their rudimentary state, and in the absence of antennae, we have characters common with certain Suctorial Entomostracans; and this similarity apparently arises from the fixed condition of the animals of both groups.
Even in the Suctorial Entomostracans, which become immoveably attached to the fish on which they prey, the males are free; and the means of attachment, as far as known, are quite different.
To its hinder section, which forms the suctorial apparatus of the adult, three powerful muscles (a dorsal and two lateral) are attached.
It probably also gives rise to the three muscles attached to the suctorial apparatus of the oesophagus.
A division of amphibians having suctorial disks on the toes, as the tree frogs.
They have a suctorial proboscis, often including two pairs of sharp organs (mandibles and maxillæ) with which they pierce the skin of animals.
And to omit a number of instances, in the suctorial Hemiptera or bugs we have different grades of structure in the mouth-parts.
Footnote 11: As we descend to the soft, tube-like, suctorial (?
Protozoa, the suctorial tubules of the Acinetaria, and the "nutritive processes" of the ovarian ova in many Lepidoptera.
By means of the suctorial mouth, stones are removed from more or less circular area so as to form a shallow excavation.
In this group, imperfect neural arches were probably present; and a ventral suctorial mouth without a mandible and maxillae was still persistent.
In front of the mouth two pairs of papillae grow out, which appear to be of the same nature as the papillae on the suctorial disc in the embryo of Lepidosteus (vide p.
Impregnation is effected by the male attaching itself by its suctorial mouth to the female.
Its structure appears adapted in some way to support the suctorial mouth of the Tadpole.
If these identifications are correct the barbels of fishes must be phylogenetically derived from the papillae of a suctorial disc adjoining the mouth.
To these may be added the suctorial mouth of the Myxinoid fishes[107].
Owing to the development of food-yolk in the Elasmobranch ovum the early stages of development are to some extent abbreviated, and almost all trace of a stage with a suctorial mouth has become lost.
The upper and lower jaws become gradually prolonged, till they eventually form a snout; while at the end of the upper jaw is placed the suctorial disc, which is now considerably reduced in size (fig.
The same species, showing the two kinds of tentacles (the suctorial and the pointed), and two contractile vacuoles b.
Acineta grandis, Saville Kent; showing pedunculated cup, and animal with two bunches of entirely suctorial tentacles.
Stones and pebbles, gripped in the suctorial mouth, are removed from a selected spot and piled around the circumference, so that the eggs, which are laid within the circle, are not easily washed away.
Body tolerably smooth, suctorial mouth and sucker, the intestine losing itself in the tissue of the body, and without an anus; androgynous.
In one of these the body is tolerably smooth, and the pharynx commencing from a simple suctorial mouth elongates into a ramified intestine without an anus; they are androgynous--Saugwürmer.
The expanded anemone exhibits a more or less cylindrical body, attached by a suctorial base to a rock or some other object, and a broad circular disc above.
Lampreys are carnivorous creatures, and attach themselves to fishes by their suctorial mouths, and rasp away the flesh.
The body has a cephalothorax, which bears a conical suctorialproboscis on the anterior end, and on top a prominence containing four eyes.
They have no tentacles, but covering the end of the manubrium and hanging from it like tentacles are oval appendages with numerous minute funnel-like apertures, called suctorial mouths.
Anatomy of the Mouth-parts and Suctorial Apparatus of Culex.
In these pages the Commission considers the question of the transference of plague by suctorial insects.
It considers Simonds' claims and others and believes that "suctorial insects do not come under consideration with the spread of plague.
Against this claim much negative evidence was considered and the final conclusion was "that suctorial insects do not come under consideration in connection with the spread of plague.
Fleas or other suctorial insects feeding on such rats take myriads of these bacilli into their stomach and get many on their proboscis.
In this connection the possibilities of the conveyance of plague bacilli by other suctorial parasites and by insects which are not parasites, must be borne in mind.
Therefore the destruction of both rats and fleas, the isolation of human plague cases, and the exclusion from them of all suctorial parasites and insects, will provide practical security for mankind generally.
The contrast among the Lepidoptera between the suctorialmouth of the imago and the biting jaws of the caterpillar is very striking (cf.
The suctorial disc is still a prominent structure at the end of the snout.
The suctorial disc, though much reduced, is still prominent at the end of the snout.
Besides these muscles there are in the thorax, attached to the suctorial extremity of the stomodaeum, three powerful muscles, which I believe to be derived from the somatic mesoblast.
Immediately below the suctorial disc is a slit-like space, forming the mouth.
The stomodaeum is considerably larger than in the last stage, and is lined by a cuticle; it is a blind tube, the blind end of which is the suctorial pouch of the adult.
In the thorax the yolk is anteriorly divided into two lobes by the vertical septum, which contains the vertical muscle of the suctorial pouch.
In this septum there is formed at a later stage a vertical muscle attached to the suctorial part of the stomodaeum.
In the region of the head there is a considerable elongation of the pre-oral part, forming a short snout, at the end of which is placed the suctorial disc.
In the mesoblast adjoining the suctorial disc there are numerous sinus-like vascular channels.
In front of the mouth is placed the suctorial disc (s.
One of the most remarkable organs of the larval Lepidosteus is the suctorial disc, placed at the front end of the head, to which we have made numerous allusions in the first section of this memoir.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "suctorial" in a variety of sentences. We hope that you will now be able to make sentences using this word.
