Gonopore is the genital pore in some invertebrates and especially some insects. The position of gonopore differs in different organisms. The role of reproduction is to provide continue existence of species. So function of gonopores to carry out reproduction.
What is a Gonopore in biology?
Definition of gonopore
: a genital pore in some invertebrates and especially some insects.
Is Gonophores are medusoid Zooid?
The gonophores or the reporductive medusoids occur singly on separate stalks or in clusters on polypoid gonozooids as in Velella or on simple or branched gonodendra. The gonophores may be medusa-like with bell, velum, radial canals and a manubrium bearing gonads.
What is male gonopore in cockroach?
The male reproductive system of cockroach consists of a pair of testes. The testes lie on each lateral side in the 4th – 6th abdominal segments. A thin vas deferens arises from each testis. … The ejaculatory duct opens into male gonopore which is situated ventral to anus.
What are Penial spicules?
Penial spicules: Penial spicules are located in the spicular pouch. Two spicular pouches are situated on the dorsal side of the cloaca. These are basically evaginations of the cloaca. The penial spicules are enclosed in a spicular sheath and it consists of a cytoplasmic core surrounded by thick cuticle.
What is gonopore in Ascaris?
Each spicular pouch secretes and houses a club-shaped spicule or penial seta enclosed in a spicular sheath and it consists of a cytoplasmic core surrounded by the thick cuticle. … The spicules help in opening female gonopore during copulation. Sperms of Ascaris are the tail, asymmetrical and amoeboid.
What is gonopore in liver fluke?
The gonads in these liver flukes are well developed. The genital atrium is situated in the anterior part of the body and it open out through common genital aperture or gonopore. The gonopore is located just in front of the acetabulum.
Where are sperm stored in cockroaches?
In cockroaches, the sperm are stored in the seminal vesicles which is a part of the reproductive system of the cockroach. In seminal vesicles, the sperms are glued together in the form of bundles which are known as spermatophores, and discharged during copulation.
Do polyps have gonozooids?
Polyps from the Cnidaria Hydractinia symbiolongicarpus form colonies where labour is divided between reproduction (gonozooids), feeding (gastrozooids) and defense (dactylozooid). … The gonozooids have gametes-producing organs called gonophores on their body column.
What are Ghana pores?
A gonopore, sometimes called a gonadopore, is a genital pore in many invertebrates. Hexapods, including insects have a single common gonopore, except mayflies, which have a pair of gonopores.
What is a Gastrozooid?
Definition of gastrozooid
: a zooid provided with a mouth and digestive organs : trophozooid.
What is Titillator in cockroach?
It has a broad base from which several structures arise, on the extreme left is a long slender arm with a curved hook called titillator, next to the titillator is a shorter and broader arm ending in a black hammer-like head called pseudopenis.
Is ejaculatory duct in cockroach paired?
The cockroach has a segmented body that is divided into three different parts- head, thorax, and abdomen. The male reproductive system of Periplaneta consists of a pair of testes, a pair of vasa deferentia, and ejaculatory duct, a pair of seminal vesicles, a mushroom-shaped gland, and a phallic gland.
What is Gonapophysis in cockroach?
Gonapophysis is an organ or process that serves in copulation, oviposition, or stinging of an insect’s anal region. In male cockroache gonapophysics, some asymmetric chitinous structures are discovered at the end of the abdomen surrounding the masculine gonopore.
How big is an infertile Ascaris egg?
Ascaris lumbricoides unfertilized eggs.
In some cases, the outer layer is absent (known as decorticated eggs). Fertile eggs range from 45 to 75 µm in length. Unfertilized eggs are elongated and larger than fertile eggs (up to 90 µm in length).
How do Ascaris reproduce?
Adult Ascaris worms live in the lumen of the intestinal tract. … These adult female worms have their eggs fertilized by male worms inside the host organism’s intestines. They can produce more than 250,000 eggs every day! These eggs then exit the host organism through the host’s feces.
Which disease is caused by Ascaris lumbricoides?
Ascariasis is an infection of the small intestine caused by Ascaris lumbricoides, which is a species of roundworm. Roundworms are a type of parasitic worm. Infections caused by roundworms are fairly common. Ascariasis is the most common roundworm infection.
What is pineal setae in Ascaris?
In the male Ascaris, the tail is curved and the anus is replaced by cloaca. From the cloaca, two equal chitinous spicules rise or penial setae projects out. These are helpful in the process of copulation.
Is Spermatheca present in male cockroach?
A) 6th abdominal segment of male. B) Hint: The spermatheca is an ectodermal organ responsible for receiving, maintaining, and releasing sperm to fertilize eggs. …
What is acetabulum in liver fluke?
The acetabulum is an adaptive parasitic morphologic feature in the liver flukes and other worms such as the annelids, which is basically used for attachment. … The acetabulum can be described as a large sucking organ in these worms, with which the worms have the ability to attach to the host and move.
What is the excretory organ in liver fluke?
Animal | Excretory Organs |
---|---|
Earthworm | Nephridia |
Liver fluke | Flame cells |
Prawns | Green/antennal glands |
Cockroach | Malpighian tubules |
What is liver fluke habitat?
Liver flukes are found world-wide, especially in the U.S., Europe, Asia, and S. Africa. Basically they inhabit any region where mammals and snails are found.
How many ganglia are in cockroach?
Three ganglia are present on the thorax, and six in the abdomen. The nervous system of the cockroach is distributed all over the body.
Where are sperm stored in the male?
Along the top of each testicle is the epididymis. This is a cordlike structure where the sperm mature and are stored.
What is hemolymph in cockroach?
Cockroaches, like other insects have an open circulatory system and their blood is also known as haemolymph. It flows freely inside the body, touching all the internal organs and tissues. About 90% of this blood is watery fluid and the remaining 10% is made up of hemocytes.
What does the Gastrodermis do?
Gastrodermis helps in extracellular digestion of food in the gastrovascular cavity.
What is Cnidoblast cell?
A cnidocyte (also known as a cnidoblast or nematocyte) is an explosive cell containing one giant secretory organelle called a cnidocyst (also known as a cnida ( pl. cnidae) or nematocyst) that can deliver a sting to other organisms.
Which is called as gonozooids?
brood chambers, which are called gonozooids. During development, a young embryo squeezes off groups of cells that form secondary embryos; these in turn may form tertiary embryos.
What is a Hydranth?
Definition of hydranth
: one of the feeding zooids of a hydroid colony.
What are zooids in cnidaria?
Zooids are the individual polyps present in the colonies of hydroids. Individual zooids in the colony perform various different tasks such as reproductive polyps are called gonozooids, feeding individuals are called gastrozooids.
How does a polyp turn into a Medusa?
In organisms that exhibit both forms, such as members of the cosmopolitan genus Obelia, the polyp is the asexual stage and the medusa the sexual stage. In such organisms the polyp, by budding, gives rise to medusae, which either detach themselves and swim away or remain permanently attached to the polyp.
What is the function of Colleterial gland?
The colleterial glands of insects are organs associated with the female genital apparatus. In cockroaches, these glands produce secretions that cover two parallel rows of eggs during oviposition, and in oviparous species, these secretions become the tanned, sculpted, rigid outer casing of the ootheca.
What is the function of Pseudopenis in cockroach?
(1) Phallomere also called as pseudopenis, is the external genitalia in cockroach. Gonopore is a specific reproductive pore or aperture which acts as an opening of ejaculatory duct. Spermatophore is a capsule or bundle of sperm created by male cockroach containing spermatozoa.
How can you tell a male cockroach?
The wings of the male cockroach are larger. The wings of the female cockroach are smaller. The antennae of male cockroaches are smaller than that of the females. The antennae are relatively larger than that of the males.
How many Ovarioles do female cockroaches have?
The female reproductive system consists of two large ovaries, lying laterally in the 2nd – 6th abdominal segments. Each ovary is formed of a group of eight ovarian tubules or ovarioles, containing a chain of developing ova, so in total 16 ovarioles.
How many ejaculatory ducts are in the male reproductive system?
There are two ejaculatory ducts, left and right side, that are formed by the union of the duct from the seminal vesicle and the ductus (vas) deferens.