Spicuous and well-known feature of ants is the wingless condition of the " workers," as the specialized females, with undeveloped ovaries, which form the largest proportion of the population of ant-communities, are called.
The ovaries are more usually one pair, but two are sometimes present.
In C. nigrescens and in some other species a zooid may contain a pair of ovaries, a pair of testes, or an ovary and a testis, although the males, females and hermaj phrodites do not differ from one another in external characters.
In botany the word is used for ovaries not terminating in a stigma.
The body bears tentacles, but shows no division into hydrorhiza, hydrocaulus or hydranth; it is temporarily fixed and has no perisarc. The polyp is usually hermaphrodite, developing both ovaries and testes in the same individual.
As in all poplars, the catkins expand in early spring, long before the leaves unfold; the ovaries bear four linear stigma lobes; the capsules ripen in May.
But the ovaries of worker ants are in some cases sufficiently developed for the production of eggs, which may give rise parthenogenetically to male, queen or worker offspring.
As an example of the former it has been shown (Beddard) that a large median sac in Lybiodrilus is at first freely open to the coelom, that it later becomes shut off from the same, that it then acquires an external orifice, and, finally, that it encloses the ovary or ovaries, between which and the exterior a passage is thus effected.
Gonads limited in number of pairs, testes and ovaries always present in the same individual.
It is indeed only among the Eudrilidae that the enclosure of the ovaries in septal sacs is at all general.
There are, however, in the Eudrilidae, as already mentioned, sacs envolving the ovaries which bore their own way to the exterior, and thus may be termed coelomoducts.
In Heliodrilus the blind extremity of the spermatheca is enclosed in a coelomic sac which is in connexion with the sacs envolving the ovaries and oviducts.
Testes and ovaries always free.
Testes, and occasionally ovaries, enclosed in sacs.
The testes are more numerous than the ovaries, of which latter there are never more than one pair.
The ovaries are solid bodies, of which the outer layer becomes separated from the plug of cells lying within; thus a cavity is formed which is clearly coelom.
- Ovaries of Cockroach, with Oviducts Od and Colleterial Glands CG.
Wagner made his classical observations on the production of larvae from unfertilized eggs developed in the precociouslyformed ovaries of a larval gall-midge (Cecidomyid), and subsequent observers have confirmed his results by studies on insects of the same family and of the related Chironomidae.
Ovaries and Spermaries: Gonocoels and Gonoducts.
Examples of physiological hypertrophy are found in the ovaries, uterus and mammary glands, where there is an increased functional activity required at the period of gestation.
The ovaries show atrophic changes after the menopause.
Ov., ovaries; sh.g., shell gland; y.g., yolk gland; r.s., receptaculum seminis; ut., uterus; X 7.
The female organs consist of distinct ovaries and yolk-glands, the ducts of which uniti.
The ovaries open in a similar position but never reach farther forward than the fourth segment.
The development of a true insect society among the Hymenoptera is dependent on a differentiation among the females between individuals with well-developed ovaries (" queens ") whose special function is reproduction; and individuals with reduced or aborted ovaries (" workers ") whose duty is to build the nest, to gather food and to tend and feed the larvae.
Hermaphrodite, the ovaries and testes distinct, with separate apertures.
The reproductive organs, both ovaries and testes, become fused together in the middle of the body.
They consist of solid or tubular ovaries which may be single, double or multiple.
The .- trunk contains a spacious body-cavity filled during the breeding season by the swollen ovaries, and the same is true of the tail if we substitute testes for ovaries.
The ovaries are attached to the side walls of the trunk region; between them and the body wall lie the two oviducts whose inner and anterior end is described as closed, their outer ends opening one on each side of the anus, where the trunk joins the tail.
Dematophora necatrix on roots, Calyptospora Goeppertiana on stems, Ustilago Scabiosae in anthers, Claviceps purpurea in ovaries, &c. Associated with these relations are the specializations which parasites show in regard to the age of the host.
Into the former the ovaries project, though the lumen of the lateral body-cavity is quite shut off from the lumina of the ovaries or uteri.
There are two series of ovaries extending through a large part of the body and accompanied by two uteri; the latter open by two oviducts which debouch into an atrium which also receives the intestine and a single receptaculum seminis, and is continued backward as the cloaca; this opens posteriorly.
The ovaries are epithelial sacs which open into the uteri.
- Ovaries of Queen and Workers (Apis).
B, Rudimentary ovaries of ordinary worker.
C, Partiallydeveloped ovaries of fertile worker.
Among peculiarities of the internal organs the segmental arrangement of the ovaries in most members of the order is noteworthy.
The paired ovaries discharge their products into a median coelemic chamber with lateral branches (C), often called the uterus, from which the ripe ova are discharged by a median dorsal pore into the terminal region of the rectum (cloaca).
The ear loses its starch, and ceases to grow, and its ovaries become penetrated with the white spongy tissue of the mycelium of the fungus which towards the end of the season forms the sclerotium, in which state the fungus lies dormant through the winter.
When the ovaries of the plant become affected with a peculiar fungus (Claviceps purpurea) they become blackened and distorted, constituting ergot.
These last possess ovaries like the queen, but shrunken and aborted so as to render the insect normally incapable of eggproduction.
The ovaries consist of a pair of tubes closely applied together, and continued posteriorly into the oviducts.
The ovaries always contain spermatozoa, some of which project through the ovarian wall into the body cavity.
- Syncarpous Pistil of Flax (Linum), consisting of five carpels, united by their ovaries, while their styles and stigmas are separate.
90), and in this case, when the ovaries form apparently a single body, the organ receives the name of compound ovary; or the union may take place by the ovaries and styles, while the stigmas are disunited; or by the stigmas and the summit of the style only.
Various intermediate states exist, such as partial union of the ovaries, as in the rue, where they coalesce at their base; and partial union of the styles, as in Malvaceae.
Occasionally, divisions take place in ovaries which are not formed by the edges of contiguous carpels.
92), or the one may be erect and the other inverted, as in some species of Spiraea and Aesculus; or they may be placed one above another, each directed similarly, as is the case in ovaries containing a moderate or definite number of ovules.
2), says, " Krohn stated that the structures described by my father as ovaries were in reality salivary glands, also that the oviduct runs down to the orifice described in the Monograph of the Cirripedia as the auditory meatus."
The genital glands, ovaries and testes, are attached to the dorsal wall of the body-cavity, in the immediate vicinity of the kidneys, with which the male glands are intimately connected.
- Of these the thyroid gland, the suprarenal bodies, the spleen, the bile, the bone marrow, the ovaries and some others have been investigated fully.
The ovaries arise like the testes as rounded bodies in the ligament.