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Pontoscolex Kuneguara
''Pontoscolex'' is a genus of earthworms in the family Glossoscolecidae, or alternatively, in the family Rhinodrilidae. General characteristics The type species '' Pontoscolex corethrurus'' has a circumtropical distribution, although it originates in the Neotropics, probably in the Guiana Plateau. It reproduces parthenogenetically, and under experimental conditions can complete its life cycle in about one year. Adults measure in length. Diagnostic characteristics There are eight setae per segment, arranged in regular rows, at least in the anterior part of the animal, whereas in the posterior part the arrangement varies (regular, more or less irregular, or in quincunx). No pigment is usually present. Male pores and tubercula pubertatis are in the clitellar region. The gizzard is in the segment VI. Three pairs of calciferous glands of tubular-dichotomous (panicled) structure are in the segments VII–IX. Dorsal, ventral, supra- and subesophageal and subneural vessels are pre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal
Animals are multicellular, eukaryotic organisms in the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, are Motility, able to move, can Sexual reproduction, reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of Cell (biology), cells, the blastula, during Embryogenesis, embryonic development. Over 1.5 million Extant taxon, living animal species have been Species description, described—of which around 1 million are Insecta, insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have Ecology, complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a Symmetry in biology#Bilate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gizzard
The gizzard, also referred to as the ventriculus, gastric mill, and gigerium, is an organ found in the digestive tract of some animals, including archosaurs (pterosaurs, crocodiles, alligators, dinosaurs, birds), earthworms, some gastropods, some fish, and some crustaceans. This specialized stomach constructed of thick muscular walls is used for grinding up food, often aided by particles of stone or grit. In certain insects and molluscs, the gizzard features chitinous plates or teeth. Etymology The word ''gizzard'' comes from the Middle English ''giser'', which derives from a similar word in Old French ''gésier'', which itself evolved from the Latin ''gigeria'', meaning giblets. Structure In birds Birds swallow food and store it in their crop if necessary. Then the food passes into their glandular stomach, also called the proventriculus, which is also sometimes referred to as the true stomach. This is the secretory part of the stomach. Then the food passes into the gizzard ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pontoscolex Kuneguara
''Pontoscolex'' is a genus of earthworms in the family Glossoscolecidae, or alternatively, in the family Rhinodrilidae. General characteristics The type species '' Pontoscolex corethrurus'' has a circumtropical distribution, although it originates in the Neotropics, probably in the Guiana Plateau. It reproduces parthenogenetically, and under experimental conditions can complete its life cycle in about one year. Adults measure in length. Diagnostic characteristics There are eight setae per segment, arranged in regular rows, at least in the anterior part of the animal, whereas in the posterior part the arrangement varies (regular, more or less irregular, or in quincunx). No pigment is usually present. Male pores and tubercula pubertatis are in the clitellar region. The gizzard is in the segment VI. Three pairs of calciferous glands of tubular-dichotomous (panicled) structure are in the segments VII–IX. Dorsal, ventral, supra- and subesophageal and subneural vessels are pre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pontoscolex Hystrix
''Pontoscolex'' is a genus of earthworms in the family Glossoscolecidae, or alternatively, in the family Rhinodrilidae. General characteristics The type species '' Pontoscolex corethrurus'' has a circumtropical distribution, although it originates in the Neotropics, probably in the Guiana Plateau. It reproduces parthenogenetically, and under experimental conditions can complete its life cycle in about one year. Adults measure in length. Diagnostic characteristics There are eight setae per segment, arranged in regular rows, at least in the anterior part of the animal, whereas in the posterior part the arrangement varies (regular, more or less irregular, or in quincunx). No pigment is usually present. Male pores and tubercula pubertatis are in the clitellar region. The gizzard is in the segment VI. Three pairs of calciferous glands of tubular-dichotomous (panicled) structure are in the segments VII–IX. Dorsal, ventral, supra- and subesophageal and subneural vessels are pre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pontoscolex Hingstoni
''Pontoscolex'' is a genus of earthworms in the family Glossoscolecidae, or alternatively, in the family Rhinodrilidae. General characteristics The type species '' Pontoscolex corethrurus'' has a circumtropical distribution, although it originates in the Neotropics, probably in the Guiana Plateau. It reproduces parthenogenetically, and under experimental conditions can complete its life cycle in about one year. Adults measure in length. Diagnostic characteristics There are eight setae per segment, arranged in regular rows, at least in the anterior part of the animal, whereas in the posterior part the arrangement varies (regular, more or less irregular, or in quincunx). No pigment is usually present. Male pores and tubercula pubertatis are in the clitellar region. The gizzard is in the segment VI. Three pairs of calciferous glands of tubular-dichotomous (panicled) structure are in the segments VII–IX. Dorsal, ventral, supra- and subesophageal and subneural vessels are pre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pontoscolex Franzi
''Pontoscolex'' is a genus of earthworms in the family Glossoscolecidae, or alternatively, in the family Rhinodrilidae. General characteristics The type species '' Pontoscolex corethrurus'' has a circumtropical distribution, although it originates in the Neotropics, probably in the Guiana Plateau. It reproduces parthenogenetically, and under experimental conditions can complete its life cycle in about one year. Adults measure in length. Diagnostic characteristics There are eight setae per segment, arranged in regular rows, at least in the anterior part of the animal, whereas in the posterior part the arrangement varies (regular, more or less irregular, or in quincunx). No pigment is usually present. Male pores and tubercula pubertatis are in the clitellar region. The gizzard is in the segment VI. Three pairs of calciferous glands of tubular-dichotomous (panicled) structure are in the segments VII–IX. Dorsal, ventral, supra- and subesophageal and subneural vessels are pre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pontoscolex Cynthiae
''Pontoscolex'' is a genus of earthworms in the family Glossoscolecidae, or alternatively, in the family Rhinodrilidae. General characteristics The type species '' Pontoscolex corethrurus'' has a circumtropical distribution, although it originates in the Neotropics, probably in the Guiana Plateau. It reproduces parthenogenetically, and under experimental conditions can complete its life cycle in about one year. Adults measure in length. Diagnostic characteristics There are eight setae per segment, arranged in regular rows, at least in the anterior part of the animal, whereas in the posterior part the arrangement varies (regular, more or less irregular, or in quincunx). No pigment is usually present. Male pores and tubercula pubertatis are in the clitellar region. The gizzard is in the segment VI. Three pairs of calciferous glands of tubular-dichotomous (panicled) structure are in the segments VII–IX. Dorsal, ventral, supra- and subesophageal and subneural vessels are pre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pontoscolex Cuasi
''Pontoscolex'' is a genus of earthworms in the family Glossoscolecidae, or alternatively, in the family Rhinodrilidae. General characteristics The type species ''Pontoscolex corethrurus'' has a circumtropical distribution, although it originates in the Neotropics, probably in the Guiana Plateau. It reproduces parthenogenetically, and under experimental conditions can complete its life cycle in about one year. Adults measure in length. Diagnostic characteristics There are eight setae per segment, arranged in regular rows, at least in the anterior part of the animal, whereas in the posterior part the arrangement varies (regular, more or less irregular, or in quincunx). No pigment is usually present. Male pores and tubercula pubertatis are in the clitellar region. The gizzard is in the segment VI. Three pairs of calciferous glands of tubular-dichotomous (panicled) structure are in the segments VII–IX. Dorsal, ventral, supra- and subesophageal and subneural vessels are prese ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spermatheca
The spermatheca (pronounced plural: spermathecae ), also called receptaculum seminis (plural: receptacula seminis), is an organ of the female reproductive tract in insects, e.g. ants, bees, some molluscs, oligochaeta worms and certain other invertebrates and vertebrates. Its purpose is to receive and store sperm from the male or, in the case of hermaphrodites, the male component of the body. Spermathecae can sometimes be the site of fertilization when the oocytes are sufficiently developed. Some species of animal have multiple spermathecae. For example, certain species of earthworms have four pairs of spermathecae—one pair each in the 6th, 7th, 8th, and 9th segments. The spermathecae receive and store the spermatozoa of another earthworm during copulation. They are lined with epithelium and are variable in shape: some are thin, heavily coiled tubes, while others are vague outpocketings from the main reproductive tract. It is one of the many variations in sexual reproduct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Septum
In biology, a septum (Latin for ''something that encloses''; plural septa) is a wall, dividing a cavity or structure into smaller ones. A cavity or structure divided in this way may be referred to as septate. Examples Human anatomy * Interatrial septum, the wall of tissue that is a sectional part of the left and right atria of the heart * Interventricular septum, the wall separating the left and right ventricles of the heart * Lingual septum, a vertical layer of fibrous tissue that separates the halves of the tongue. *Nasal septum: the cartilage wall separating the nostrils of the nose * Alveolar septum: the thin wall which separates the alveoli from each other in the lungs * Orbital septum, a palpebral ligament in the upper and lower eyelids * Septum pellucidum or septum lucidum, a thin structure separating two fluid pockets in the brain * Uterine septum, a malformation of the uterus * Vaginal septum, a lateral or transverse partition inside the vagina * Intermuscular sep ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seminal Vesicle
The seminal vesicles (also called vesicular glands, or seminal glands) are a pair of two convoluted tubular glands that lie behind the urinary bladder of some male mammals. They secrete fluid that partly composes the semen. The vesicles are 5–10 cm in size, 3–5 cm in diameter, and are located between the bladder and the rectum. They have multiple outpouchings which contain secretory glands, which join together with the vas deferens at the ejaculatory duct. They receive blood from the vesiculodeferential artery, and drain into the vesiculodeferential veins. The glands are lined with column-shaped and cuboidal cells. The vesicles are present in many groups of mammals, but not marsupials, monotremes or carnivores. Inflammation of the seminal vesicles is called seminal vesiculitis, most often is due to bacterial infection as a result of a sexually transmitted disease or following a surgical procedure. Seminal vesiculitis can cause pain in the lower abdomen, scrotum, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metagyny
Sequential hermaphroditism (called dichogamy in botany) is a type of hermaphroditism that occurs in many fish, gastropods, and plants. Sequential hermaphroditism occurs when the individual changes its sex at some point in its life. In particular, a sequential hermaphrodite produces eggs (female gametes) and sperm (male gametes) at different stages in life. Species that can undergo these changes from one sex to another do so as a normal event within their reproductive cycle that is usually cued by either social structure or the achievement of a certain age or size. In animals, the different types of change are male to female (protandry or protandrous hermaphroditism), female to male (protogyny or protogynous hermaphroditism), bidirectional (serial or bidirectional hermaphroditism). Both protogynous and protandrous hermaphroditism allow the organism to switch between functional male and functional female. Bidirectional hermaphrodites have the capacity for sex change in either direct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
