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Oviparous Oviparous is a zoological term that refers to animals that lay eggs which then hatch externally. Oviparous animals may fertilize their eggs either externally or internally. External fertilization in many aquatic invertebrates is less well controlled; for example, in the case of many marine invertebrates which shed immense numbers of gametes to the water more or less simultaneously, with ova and sperm meeting somewhat by chance. science.jrank.org /pages/4952/Oviparous.html   (417 words)

Tasmanian Velvet Worms: Oviparous spp. Oviparous velvet worms were first collected in Tasmania more than a century ago (Spencer 1895) and have long been recognised as widespread and not uncommon animals in this State (Hickman 1963). Oviparous species are remarkably tolerant of habitat disturbance, such as wildfire, part-clearing, and the clearfelling, burning and regeneration of native forest, and they successfully colonise forest plantations (Mesibov 1998b, Bonham et al. Oviparous species seem to be particularly abundant on the Great Western Tiers and in open eucalypt forest in the eastern and southern portions of the Central Plateau. www.qvmag.tas.gov.au /zoology/multipedes/tasonych/ony14etc.html   (364 words)

Egg (biology) - Wikipedia, the free encyclopedia Oviparous animals are animals that lay eggs, with little or no other development within the mother. Salmon fry hatching - the larva has grown around the remains of the yolk and the remains of the soft, transparent egg are discarded. The most common reproductive strategy for fish is known as oviparity, in which the female lays undeveloped eggs that are externally fertilized by a male. en.wikipedia.org /wiki/Oviparous   (1341 words)

Ovum - Wikipedia, the free encyclopedia In the oviparous animals (all birds, most fishes, amphibians and reptiles) the ova develop protective layers and pass through the oviduct to the outside of the body. The egg cell's cytoplasm and mitochondria (and chloroplasts in plants) are the sole means of the egg being able to reproduce by mitosis and eventually form a blastocyst after fertilisation. There is an intermediate form, the ovoviviparous animals: the embryo develops within and is nourished by an egg as in the oviparous case, but then it hatches inside the mother's body shortly before birth, or just after the egg leaves the mother's body. en.wikipedia.org /wiki/Ovum   (431 words)

JIS: Tschinkel 2.12.2002 Over-wintering eggs are laid on elm by apterous oviparous females that are produced by alate sexuparae in the fall that consist of reproducing males and oviparous females (Fig. In this study, virginoparae, sexuparae (alates reproducing males and oviparous females) and sexual morphs (males and oviparous females) were observed on apple, both in laboratory and natural populations in the absence of elm trees. The oviparous female is bigger (0.85 ± 0.01 mm in length and 0.45 ± 0.01 mm in width) than the male (0.55 ± 0.01 mm in length and 0.27 mm in width). www.insectscience.org /5.27   (3220 words)

Egg (biology) Summary The word oviparous refers to animals that lay eggs which hatch externally.In other words the female retains the fertilized eggs in her body until they hatch, so that "live" young are born. Depending on the species, the eggs of oviparous animals may be fertilized inside the body of the female, or externally. The most common reproductive strategy for fish is known as oviparity, in which the female lays undeveloped eggs that are externally fertilized by a male. www.bookrags.com /Egg_(biology)   (1581 words)

Gulf Ecology Division In the context of oviparous vertebrates, the workshop focused on the routes of contaminant exposure and the mechanisms of effect on reproduction and development, organismal outcomes, and ecological ramifications. Oviparous vertebrates generally occupy important niches in aquatic as well as terrestrial systems, and reproductive and developmental effects on these species can be of relatively great ecological significance. In addition, oviparous vertebrates that occupy higher trophic levels may be especially vulnerable to persistent organic chemicals by means of trophic transfer. www.epa.gov /ged/publica/cabbck27.htm   (3595 words)

CHAP But the oviparous animals, which produce, at the same time, both uterus and foetus, and throw them out of the body, are almost perpetually in a condition to reproduce; and it is well known, that, if a hen be prevented from sitting, and be fully fed, the number of her eggs may be greatly increased. All birds and flying insects are oviparous, except some species of flies which produce their young alive.* These have no wings immediately after their birth; but they gradually shoot out as the animal advances in growth; and they are not in a condition to be used till it acquires full maturity. The oviparous animals produce eggs, which gradually increase in size, till they quit the ovarium and fall into the canal of the uterus, where they receive their white, their membranes, and their shell. faculty.njcu.edu /fmoran/vol2ix.htm   (2796 words)

Oviparous Sharks According to Compagno 1990, 43% of all cartilaginous fishes are oviparous. Oviparity is only one of 6-8 modes of reproduction in elasmobranchs. Until recently, the reproductive mode of the whale shark was uncertain, oviparous or ovoviparous. homepage.mac.com /mollet/Eggcases/Oviparous_sharks.html   (1167 words)

SHARKS & RAYS - Birth & Care of Young There are three types of embryonic development: oviparous, ovoviviparous, and viviparous. In oviparous ("egg birth") sharks, a gland secretes a shell, or case, around the egg as it passes through the oviduct, protecting the shark until it hatches. Oviparous sharks include horn sharks and swell sharks (Cephaloscyllium ventriosum). www.seaworld.org /animal-info/info-books/sharks-&-rays/birth-&-care.htm   (473 words)

Ovum Summary Both oviparous and viviparous strategies are represented among amphibians (frogs, salamanders, and the often-hiding, wormlike caecilians). In oviparous amniotes, the eggs are protected by a sturdy shell that safeguards the embryo against desiccation, although some air and moisture can pass through the shell. The egg cell's cytoplasm and mitochondria (and chloroplasts in plants) are the sole means of the egg being able to reproduce by mitosis and eventually form a blastocyst after fertilisation. www.bookrags.com /Ovum   (5964 words)

Glossary of Reptile Reproduction Terms In oviparous species, fertilization occurs when the sperm meet the ova as they pass through the oviduct, a passage which also layers the outside of the egg with calcium to form a shell. In oviparous reptile species, several mature eggs will be produced, depending on the species and the individual. The eggs of oviparous reptile are shelled as they pass through the oviducts on their way to the coelomic cavity, which occurs several days prior to laying. www.anapsid.org /resources/glossary2.html   (798 words)

ARISTOTLE - Generation of Animals - - FULL TEXT - In Five WebPage Parts - BOOK THREE - WEBPAGE THREE - ATHENAEUM ... The generation of the oviparous sanguinea is to a certain extent similar to that of the animals that walk, and all may be embraced in the same general statement; but in other respects there are differences in them both as compared with each other and with those that walk. In these also the development from the egg runs on the same lines as that of the cartilaginous and internally oviparous fishes, except that the growth is quick and from small beginnings and the outside of the egg is harder. Birds and all oviparous quadrupeds, and any of the cartilaginous fish that are oviparous, produce a perfect egg, and it does not increase outside of them, whereas the eggs of fish are imperfect and do so complete their growth. evans-experientialism.freewebspace.com /aristotle_genanimals03.htm   (9388 words)

Book #3 The generation of the oviparous sanguinea is to a certain extent similar to that of the animals that walk, and all may be embraced in the same general statement; but in other respects there are differences in them both as compared with each other and with those that walk. A proof that these fish also are oviparous is the fact that even viviparous fish, such as the cartilaginous, are first internally oviparous, for hence it is plain that the whole class of fishes is oviparous. Birds and all oviparous quadrupeds, and any of the cartilaginous fish that are oviparous, produce a perfect egg, and it does not increase outside of them, whereas the eggs of fish are imperfect and do so complete their growth. socrates.paunix.org /animal3.html   (9327 words)

Checklist for Order Squamata - Suborder Serpentes - Amphibians & Reptiles of Cumberland Island, Georgia   (Site not responding. Last check: ) They are diurnal, oviparous, and probably the most frequently seen snake on the island. The species is oviparous, and amphiumas form a major portion of their diet. This small to medium-sized oviparous snake is found in pine woods, often under the bark of standing, dead trees or in rotten logs or stumps. www.cimuseum.org /checklists/amp_rep_list4.html   (478 words)

HotBot Web Search for oviparous In the chart on the left, we predicted which ones would be oviparous (came from eggs) and which ones were not oviparous. Oviparous animals are animals that lay eggs, with little or no other embryonic development within the mother. If you choose to continue with the use of your current browser however, all of our content will continue to be accessible to all versions of every browser. www.hotbot.com /inderelated9index.php?query=oviparous   (183 words)

arthrophoda identification photos Most of them are oviparous, they lay eggs, but there are also viviparous arthropods procreating living animals and ovoviviparous arthropods, the incubation of eggs is internal and therefore the eggs open just when they are laid. Their body is divided in cephalothorax (thorax and head are fused together) and abdomen; they have two pairs of antennae and are oviparous, generally respiration is brachial. Respiration is cutaneous or tracheal, they are oviparous and have night habits. strano16.interfree.it /artroph.htm   (811 words)

Viviparous Sharks Then there is a segment which harbors the shell gland; a gland which is especially developed with oviparous species and serves to build up the compact, protective egg capsule. Aristoteles discovered the so-called yolk placenta and was able to differentiate between viviparous and oviparous sharks with their egg capsules. Also noticeable is that all oviparous species living on the ocean floor and in coastal regions are not very large in size and that, contrary to viviparous sharks, they populate a greater spectrum of habitats. www.sharkinfo.ch /SI1_00e/vivipary.html   (1755 words)

EZ Teach   (Site not responding. Last check: ) Animals that are born in eggs are oviparous and include most reptiles, amphibians, birds and fish. On one side, draw an oviparous animal and write the name of that animal. Create a new animal from these two such as an elephant-bird, a seahorse-horse, a tiger-snake, draw that new animal and describe it in complete sentences. www.ezteach.net /free.html   (755 words)

Reference.com/Encyclopedia/Ovum In the oviparous animals (all birds, most fishes, amphibians and reptiles) the ova develop protective layers and pass through the oviduct to the outside of the body. They are fertilized by male sperm either inside the female body (as in birds), or outside (as in many fishes). There is an intermediate form, the ovoviviparous animals: the embryo develops within and is nourished by an egg as in the oviparous case, but then it hatches inside the mother's body shortly before birth, or just after the egg leaves the mother's body. www.reference.com /browse/wiki/Egg_cells   (458 words)

Oviparous - EvoWiki   (Site not responding. Last check: ) An animal is oviparous if it lays eggs rather than giving birth to live young. Among vertebrates, oviparity is typical of fish, amphibians, reptiles, and the sole mode of reproduction in birds. It is also found in a few mammals (see monotreme). wiki.cotch.net /index.php?title=Oviparous&printable=yes   (51 words)

MANUAL ON ARTEMIA PRODUCTION IN SALT PONDS IN THE PHILIPPINES Oviparous reproduction; After copulation fertilized eggs are surrounded in the broodpouch of the female with a tough brown shell. Per batch or reproductive cycle 50–200 cysts or naupliae are produced but in oviparous reproduction the number of offspring is generally lower than in ovoviviparous reproduction. The colour of adult Artemia is correlated with the mode of reproduction, because hemoglobin synthesis is activated by low oxygen concentration in the water. www.fao.org /docrep/field/003/AC062E/AC062E03.htm   (915 words)

SICB - 2004 meeting - Abstract Details   (Site not responding. Last check: ) Results suggest that oviductal tissues in both oviparous and viviparous lizards are capable of steroid metabolism in vivo. This raises the intriguing possibility that differences in steroid metabolic capacity of oviductal tissues in oviparous species may influence the likelihood of evolving viviparity. The ability of the oviducts of oviparous species to metabolize steroids may have evolved as a way of regulating exposure of eggs to maternal steroids while the albumin and shell are formed. www.sicb.org /meetings/2004/schedule/abstractdetails.php3?id=619   (285 words)

Venomdoc Forums :: View topic - Ovoviviparous or Oviparous? There are according to the authors of that book both reports of ovoviviparity and oviparity in P australis. Finally the definition of oviparity: Reproduction in which eggs are released by the female, development of offspring occurs outside the maternal body. Now as far as I see it oviparity is easy to distinguish among snakes, i.e if they lay eggs with a shell they are oviparous. www.kingsnake.com /toxinology/forums/viewtopic.php?p=1188   (1256 words)

Honors abstract Several reptile species have been reported to contain both oviparous and viviparous populations, and there are some reptilian species with reproductive modes that are intermediate between "normal" oviparity and viviparity. Early reports suggest that one of these modes may be intermediate between oviparity and viviparity. Viviparous taxa occur in colder areas than their closest oviparous relatives, a pattern evident in the comparison between oviparous and viviparous populations of Saiphos, and between i and its closest relatives. life.bio.sunysb.edu /~ssmith/Files/honors_abstract.htm   (578 words)

Eggs v. "Live" Birth Oviporous is the correct scientific term for animals that lay eggs with a shell from which offspring emerge. Not only do many reptiles fall into this category but also birds and even platypus are oviparous. The eggs of most reptiles have a leather-like shell that thins as the hatch date looms near. double-d-reptiles.tripod.com /birth.html   (1115 words)

SuccessLink The teacher should make a class chart similar to the chart used by the students and enlarge several pictures of animals that are both oviparous and not oviparous. The student correctly identified all oviparous and non-oviparous animals. Note: We use the word oviparous at this level because it is fun for the kids to know and say, rather than doing it for memorization of the term itself. www.successlink.org /gti/gti_lesson.asp?lid=2193   (1101 words)

Amazon.com: oviparous   (Site not responding. Last check: ) Oviparous: An entry from Thomson Gale's Gale Encyclopedia of Science, 3rd ed. The distribution of the oviparous killifishes of Florida by Kenneth Relyea (Unknown Binding - 1975) The killifishes: An annotated checklist, synonymy, and bibliography of Recent oviparous cyprinodontiform fishes : the killifish master index 4 by Kenneth J Lazara (Unknown Binding - 2000) www.amazon.com /s?ie=UTF8&keywords=oviparous&tag=lexico&index=blended&link_code=qs&page=1   (577 words)

Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations Because early life stages of many species exhibit a greater toxicological sensitivity to contaminants than the adult life stages, knowledge of the exposure of contaminants during embryonic development is a crucial prerequisite for toxicological risk assessment. This study presents a chemical equilibrium model for estimating the maternal transfer and resulting exposure of developing embryos in eggs of several classes of oviparous organisms to hydrophobic organic chemicals, including chlorinated aromatic hydrocarbons and PCBs. The model is tested against (1) the results of a field study, including the analysis of 44 chemicals in eggs and maternal tissues of 6 fish species and snapping turtles, and (2) literature data for 8 additional fish and 3 bird species. www.osti.gov /energycitations/product.biblio.jsp?osti_id=323806   (372 words)

General Shark Biology All offspring, however, are born fully developed and able to fend for themselves. Oviparous species lay eggs which subsequently hatch outside of the female's body. Horn sharks are an example of an oviparous species. www2.hawaii.edu /~karuna/general_shark_biology.htm   (1644 words)

The Open Door Web Site : Biology : Animal Reproduction : Introduction Those animals which lay eggs are called egg-laying or oviparous. Below is a table of the vertebrates which shows which groups are viviparous and which groups are oviparous. Amongst the invertebrates there are many which are oviparous but a few are viviparous such as sea anemones and aphids. www.saburchill.com /chapters/chap0031.html   (854 words)

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