Both parts share a single opening called gonopore, which is located on the ventral side of the posterior half of the body. All species lay eggs . [pages needed] All others are called secondary sex organs, divided between the external sex organsthe The 7th sternum is boat-shaped in females, and it forms a brood or genital pouch with the 8th and 9th sterna. (v) The male gonopore is situated at the base of the right rhinophore. Squid distract attacking predators by ejecting a cloud of ink, giving themselves an opportunity to escape. Both parts share a single opening called gonopore, which is located on the ventral side of the posterior half of the body. Although scorpions are most common and diverse in deserts, they also live in many other habitats. Insect morphology is the study and description of the physical form of insects.The terminology used to describe insects is similar to that used for other arthropods due to their shared evolutionary history. The head comprises six fused segments with compound eyes, ocelli, antennae and mouthparts, which differ according According to studies, Monogenea is one of the oldest groups in the phylum Platyhelminthes having evolved from Turbellarians over 100 million years ago.. The ventral side of somite 1 has a pair of genital opercula covering the gonopore. Although diverse, insects are quite similar in overall design, internally and externally. The 7th sternum is boat-shaped in females, and it forms a brood or genital pouch with the 8th and 9th sterna. Examples: They have a rigid, usually spherical body bearing moveable spines, which gives the class the name Echinoidea (from the Greek ekhinos 'spine'). All planaria are hermaphrodites, meaning individual animals have both female and male reproductive parts at the same time. They have a rigid, usually spherical body bearing moveable spines, which gives the class the name Echinoidea (from the Greek ekhinos 'spine'). The genital atrium is a common chamber for male and female genital apertures, it opens externally by a gonopore lying ventrally in front of the acetabulum. Photo source: wiki The anatomy of spiders includes many characteristics shared with other arachnids.These characteristics include bodies divided into two tagmata (sections or segments), eight jointed legs, no wings or antennae, the presence of chelicerae and pedipalps, simple eyes, and an exoskeleton, which is periodically shed.. Spiders also have several adaptations that distinguish them from : Solifugae 1,100 [In this image] Planarian reproductive system. Insect physiology includes the physiology and biochemistry of insect organ systems.. Order 5. A possible early graptolite, Chaunograptus, is known from the Middle Cambrian. The ink is a suspension of melanin particles and quickly disperses to form a dark cloud that A copulatory organ on the tail collects the sperm and transfers it to the partner's seminal receptacle through the female gonopore. They serve as openings for the scorpion's respiratory organs, known as book lungs. (iii) Gill bipectinate type. Urchins typically range in size from 3 to 10 cm (1 to 4 in), although the largest species can reach up to 36 cm (14 in). They have a shark-like body, average 1.5 m (4.9 ft) in length, weigh 27 kg (60 lb), and can live in excess of thirty years. : Opiliones 6,600 4 (ii) Mantle present but without mantle cavity. The timing of the origin of ticks is uncertain, though the Sternite 2 forms the basal plate bearing the pectines, which function as sensory organs. The male has four testes; a short vas deferens arises from the testes and joins a seminal vesicle which enters a penis, the opens by a gonopore below the acetabulum. The ventral side of somite 1 has a pair of genital opercula covering the gonopore. The ventral side of somite 1 has a pair of genital opercula covering the gonopore. The body of a rotifer is divided into a head, trunk, and foot, and is typically somewhat cylindrical. : Opiliones 6,600 4 For most populations the median age is five to eight years and the maximum age is fourteen to eighteen years. American paddlefish are among the largest and longest-lived freshwater fishes in North America. The insect is made up of three main body regions (tagmata), the head, thorax and abdomen. The sperm is sometimes packaged in spermatophores and is released through male gonopores that open, often temporarily, on the underside of the animal, roughly two-thirds of the way along the body. The anatomy of spiders includes many characteristics shared with other arachnids.These characteristics include bodies divided into two tagmata (sections or segments), eight jointed legs, no wings or antennae, the presence of chelicerae and pedipalps, simple eyes, and an exoskeleton, which is periodically shed.. Spiders also have several adaptations that distinguish them from American paddlefish are among the largest and longest-lived freshwater fishes in North America. : Solifugae 1,100 Three physical features separate insects from other arthropods: they have a body divided into three regions (called tagmata) (head, thorax, and abdomen), have three pairs The insect is made up of three main body regions (tagmata), the head, thorax and abdomen. Although scorpions are most common and diverse in deserts, they also live in many other habitats. Three physical features separate insects from other arthropods: they have a body divided into three regions (called tagmata) (head, thorax, and abdomen), have three pairs Graptolites are a group of colonial animals, members of the subclass Graptolithina within the class Pterobranchia.These filter-feeding organisms are known chiefly from fossils found from the Middle Cambrian (Miaolingian, Wuliuan) through the Lower Carboniferous (Mississippian). All planaria are hermaphrodites, meaning individual animals have both female and male reproductive parts at the same time. The cirrus or penis, seminal vesicle and prostatic glands are surrounded in a common cirrus sheath or cirrus sac. Rotifers have bilateral symmetry and a variety of different shapes. There is a well-developed cuticle, which may be thick and rigid, giving the animal a box-like shape, or flexible, giving the animal a worm-like shape; such rotifers are respectively called loricate and illoricate. Typical body length does not exceed 7 mm (0.28 in), and some species are smaller than 1 mm, although the largest known species, Trogulus torosus ( Trogulidae ), grows as long as 22 mm (0. There is a well-developed cuticle, which may be thick and rigid, giving the animal a box-like shape, or flexible, giving the animal a worm-like shape; such rotifers are respectively called loricate and illoricate. Notaspidea: (i) Shell may or may not be present. scorpion, (order Scorpiones or Scorpionida), any of approximately 1,500 elongated arachnid species characterized by a segmented curved tail tipped with a venomous stinger at the rear of the body and a pair of grasping pincers at the front. The genital atrium is a common chamber for male and female genital apertures, it opens externally by a gonopore lying ventrally in front of the acetabulum. Notaspidea: (i) Shell may or may not be present. Although diverse, insects are quite similar in overall design, internally and externally. [pages needed] All others are called secondary sex organs, divided between the external sex organsthe Primarily nocturnal, scorpions often Notaspidea: (i) Shell may or may not be present. The anatomy of spiders includes many characteristics shared with other arachnids.These characteristics include bodies divided into two tagmata (sections or segments), eight jointed legs, no wings or antennae, the presence of chelicerae and pedipalps, simple eyes, and an exoskeleton, which is periodically shed.. Spiders also have several adaptations that distinguish them from (iv) Gill and osphradium on the right side of the body. Typical body length does not exceed 7 mm (0.28 in), and some species are smaller than 1 mm, although the largest known species, Trogulus torosus ( Trogulidae ), grows as long as 22 mm (0. The next four somites, 3 to 6, all bear pairs of spiracles. Examples: While many of the species in the group share a number of morphological characteristics, such as a flattened body and being small in size, Monogeneans are divided into two major groups which include monopisthocotyleans, scorpion, (order Scorpiones or Scorpionida), any of approximately 1,500 elongated arachnid species characterized by a segmented curved tail tipped with a venomous stinger at the rear of the body and a pair of grasping pincers at the front. A sex organ (or reproductive organ) is any part of an animal or plant that is involved in sexual reproduction.The reproductive organs together constitute the reproductive system.In animals, the testis in the male, and the ovary in the female, are called the primary sex organs. Although diverse, insects are quite similar in overall design, internally and externally. (ii) Mantle present but without mantle cavity. Order 5. They have a gonopore on the ventral cephalothorax, and the copulation is direct as male Opiliones have a penis, unlike other arachnids. The male has four testes; a short vas deferens arises from the testes and joins a seminal vesicle which enters a penis, the opens by a gonopore below the acetabulum. Ticks are external parasites, living by feeding on the blood of mammals, birds, and sometimes reptiles and amphibians. The female has an elongated ovary above the point where the intestine caeca rejoin, from the ovary an oviduct passes in front. (iii) Gill bipectinate type. According to studies, Monogenea is one of the oldest groups in the phylum Platyhelminthes having evolved from Turbellarians over 100 million years ago.. Three physical features separate insects from other arthropods: they have a body divided into three regions (called tagmata) (head, thorax, and abdomen), have three pairs Examples: Sea hares, Aplysia, Petalifera, Notarchus, Bursatella, Akera. The name urchin is an old word for hedgehog, which sea urchins resemble; they have archaically been called sea While many of the species in the group share a number of morphological characteristics, such as a flattened body and being small in size, Monogeneans are divided into two major groups which include monopisthocotyleans, The age of American paddlefish is best The cirrus can be everted through the gonopore during copulation. All species lay eggs . Examples: Photo source: wiki The name urchin is an old word for hedgehog, which sea urchins resemble; they have archaically been called sea Insect morphology is the study and description of the physical form of insects.The terminology used to describe insects is similar to that used for other arthropods due to their shared evolutionary history. Ticks (order Ixodida) are parasitic arachnids that are part of the mite superorder Parasitiformes.Adult ticks are approximately 3 to 5 mm in length depending on age, sex, species, and "fullness". The head comprises six fused segments with compound eyes, ocelli, antennae and mouthparts, which differ according The body of a rotifer is divided into a head, trunk, and foot, and is typically somewhat cylindrical. A copulatory organ on the tail collects the sperm and transfers it to the partner's seminal receptacle through the female gonopore. They have a gonopore on the ventral cephalothorax, and the copulation is direct as male Opiliones have a penis, unlike other arachnids. All species lay eggs . The next four somites, 3 to 6, all bear pairs of spiracles. The ink is a suspension of melanin particles and quickly disperses to form a dark cloud that Both male and female cockroaches have ten segments in their abdomen. All planaria are hermaphrodites, meaning individual animals have both female and male reproductive parts at the same time. American paddlefish are among the largest and longest-lived freshwater fishes in North America. Insect morphology is the study and description of the physical form of insects.The terminology used to describe insects is similar to that used for other arthropods due to their shared evolutionary history. They have a rigid, usually spherical body bearing moveable spines, which gives the class the name Echinoidea (from the Greek ekhinos 'spine'). Urchins typically range in size from 3 to 10 cm (1 to 4 in), although the largest species can reach up to 36 cm (14 in). Ticks (order Ixodida) are parasitic arachnids that are part of the mite superorder Parasitiformes.Adult ticks are approximately 3 to 5 mm in length depending on age, sex, species, and "fullness". (v) The male gonopore is situated at the base of the right rhinophore. Typical body length does not exceed 7 mm (0.28 in), and some species are smaller than 1 mm, although the largest known species, Trogulus torosus ( Trogulidae ), grows as long as 22 mm (0. An octopus (PL: octopuses,octopi, or octopodes, see below for variants) is a soft-bodied, eight-limbed mollusc of the order Octopoda (/ k t p d /, ok-TOP--d).The order consists of some 300 species and is grouped within the class Cephalopoda with squids, cuttlefish, and nautiloids.Like other cephalopods, an octopus is bilaterally symmetric with two eyes and a A copulatory organ on the tail collects the sperm and transfers it to the partner's seminal receptacle through the female gonopore. Order 5. For most populations the median age is five to eight years and the maximum age is fourteen to eighteen years. Both male and female cockroaches have ten segments in their abdomen. : Solifugae 1,100 Rotifers have bilateral symmetry and a variety of different shapes. A sex organ (or reproductive organ) is any part of an animal or plant that is involved in sexual reproduction.The reproductive organs together constitute the reproductive system.In animals, the testis in the male, and the ovary in the female, are called the primary sex organs. Graptolites are a group of colonial animals, members of the subclass Graptolithina within the class Pterobranchia.These filter-feeding organisms are known chiefly from fossils found from the Middle Cambrian (Miaolingian, Wuliuan) through the Lower Carboniferous (Mississippian). Primarily nocturnal, scorpions often Insect physiology includes the physiology and biochemistry of insect organ systems.. A possible early graptolite, Chaunograptus, is known from the Middle Cambrian. The next four somites, 3 to 6, all bear pairs of spiracles. [In this image] Planarian reproductive system. The front half of the pouch contains the female gonopore, spermathecal pores, and collateral glands. The age of American paddlefish is best They have a gonopore on the ventral cephalothorax, and the copulation is direct as male Opiliones have a penis, unlike other arachnids. (iv) Gill and osphradium on the right side of the body. While many of the species in the group share a number of morphological characteristics, such as a flattened body and being small in size, Monogeneans are divided into two major groups which include monopisthocotyleans, scorpion, (order Scorpiones or Scorpionida), any of approximately 1,500 elongated arachnid species characterized by a segmented curved tail tipped with a venomous stinger at the rear of the body and a pair of grasping pincers at the front. Both parts share a single opening called gonopore, which is located on the ventral side of the posterior half of the body. Ticks are external parasites, living by feeding on the blood of mammals, birds, and sometimes reptiles and amphibians. The timing of the origin of ticks is uncertain, though the (v) The male gonopore is situated at the base of the right rhinophore. The front half of the pouch contains the female gonopore, spermathecal pores, and collateral glands. Insect physiology includes the physiology and biochemistry of insect organ systems.. The head comprises six fused segments with compound eyes, ocelli, antennae and mouthparts, which differ according The cirrus or penis, seminal vesicle and prostatic glands are surrounded in a common cirrus sheath or cirrus sac. [In this image] Planarian reproductive system. Photo source: wiki There is a well-developed cuticle, which may be thick and rigid, giving the animal a box-like shape, or flexible, giving the animal a worm-like shape; such rotifers are respectively called loricate and illoricate. [pages needed] All others are called secondary sex organs, divided between the external sex organsthe They serve as openings for the scorpion's respiratory organs, known as book lungs. The name urchin is an old word for hedgehog, which sea urchins resemble; they have archaically been called sea Ticks are external parasites, living by feeding on the blood of mammals, birds, and sometimes reptiles and amphibians. Both male and female cockroaches have ten segments in their abdomen. A possible early graptolite, Chaunograptus, is known from the Middle Cambrian. (iii) Gill bipectinate type. The sperm is sometimes packaged in spermatophores and is released through male gonopores that open, often temporarily, on the underside of the animal, roughly two-thirds of the way along the body. Although scorpions are most common and diverse in deserts, they also live in many other habitats. The ink gland and its associated ink sac empties into the rectum close to the anus, allowing the squid to rapidly discharge black ink into the mantle cavity and surrounding water. Examples: Sea hares, Aplysia, Petalifera, Notarchus, Bursatella, Akera. Graptolites are a group of colonial animals, members of the subclass Graptolithina within the class Pterobranchia.These filter-feeding organisms are known chiefly from fossils found from the Middle Cambrian (Miaolingian, Wuliuan) through the Lower Carboniferous (Mississippian). An octopus (PL: octopuses,octopi, or octopodes, see below for variants) is a soft-bodied, eight-limbed mollusc of the order Octopoda (/ k t p d /, ok-TOP--d).The order consists of some 300 species and is grouped within the class Cephalopoda with squids, cuttlefish, and nautiloids.Like other cephalopods, an octopus is bilaterally symmetric with two eyes and a Examples: Sea hares, Aplysia, Petalifera, Notarchus, Bursatella, Akera. Urchins typically range in size from 3 to 10 cm (1 to 4 in), although the largest species can reach up to 36 cm (14 in). The age of American paddlefish is best The male has four testes; a short vas deferens arises from the testes and joins a seminal vesicle which enters a penis, the opens by a gonopore below the acetabulum. The ink gland and its associated ink sac empties into the rectum close to the anus, allowing the squid to rapidly discharge black ink into the mantle cavity and surrounding water. The cirrus can be everted through the gonopore during copulation. The cirrus or penis, seminal vesicle and prostatic glands are surrounded in a common cirrus sheath or cirrus sac. Sternite 2 forms the basal plate bearing the pectines, which function as sensory organs. The genital atrium is a common chamber for male and female genital apertures, it opens externally by a gonopore lying ventrally in front of the acetabulum. Sternite 2 forms the basal plate bearing the pectines, which function as sensory organs. The cirrus can be everted through the gonopore during copulation. (iv) Gill and osphradium on the right side of the body. The ink is a suspension of melanin particles and quickly disperses to form a dark cloud that They have a shark-like body, average 1.5 m (4.9 ft) in length, weigh 27 kg (60 lb), and can live in excess of thirty years. The sperm is sometimes packaged in spermatophores and is released through male gonopores that open, often temporarily, on the underside of the animal, roughly two-thirds of the way along the body. The timing of the origin of ticks is uncertain, though the According to studies, Monogenea is one of the oldest groups in the phylum Platyhelminthes having evolved from Turbellarians over 100 million years ago.. They have a shark-like body, average 1.5 m (4.9 ft) in length, weigh 27 kg (60 lb), and can live in excess of thirty years. : Opiliones 6,600 4 They serve as openings for the scorpion's respiratory organs, known as book lungs. Rotifers have bilateral symmetry and a variety of different shapes. The 7th sternum is boat-shaped in females, and it forms a brood or genital pouch with the 8th and 9th sterna. Primarily nocturnal, scorpions often Squid distract attacking predators by ejecting a cloud of ink, giving themselves an opportunity to escape. The insect is made up of three main body regions (tagmata), the head, thorax and abdomen. Squid distract attacking predators by ejecting a cloud of ink, giving themselves an opportunity to escape. The ink gland and its associated ink sac empties into the rectum close to the anus, allowing the squid to rapidly discharge black ink into the mantle cavity and surrounding water. The front half of the pouch contains the female gonopore, spermathecal pores, and collateral glands. The female has an elongated ovary above the point where the intestine caeca rejoin, from the ovary an oviduct passes in front. A sex organ (or reproductive organ) is any part of an animal or plant that is involved in sexual reproduction.The reproductive organs together constitute the reproductive system.In animals, the testis in the male, and the ovary in the female, are called the primary sex organs. An octopus (PL: octopuses,octopi, or octopodes, see below for variants) is a soft-bodied, eight-limbed mollusc of the order Octopoda (/ k t p d /, ok-TOP--d).The order consists of some 300 species and is grouped within the class Cephalopoda with squids, cuttlefish, and nautiloids.Like other cephalopods, an octopus is bilaterally symmetric with two eyes and a The female has an elongated ovary above the point where the intestine caeca rejoin, from the ovary an oviduct passes in front. 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