Reproduction and Development in Minor Phyla Book

Reproduction and Development in Minor Phyla


  • Author : T. J. Pandian
  • Publisher : Unknown
  • Release Date : 2020-11
  • Genre: Invertebrates
  • Pages : 304
  • ISBN 10 : 0367523353

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Reproduction and Development in Minor Phyla Excerpt :

"This book brings to light for the first time many interesting features in 25 minor phyletic invertebrates without being constrained by phylogenetic considerations. 1. Most of these phyla are not speciose. However, some species abound at densities of million/m2, a few flourish in anoxic habitat and a few others thrive in hot springs at 45-61ÀC. 2. In them, parthenogenesis and clonal multiplication eliminate each other. 3. Pseudocoelomates are all eutelics, i.e. mitosis ceases after hatching. 4. Increase in tissue types seems to reduce parasitic mode of life from 99.9 % in Aorganomorpha to 42 % in pseudocoelomate Nematoda, 8 % in hemocoelomate Pentastomida and 0 % in eucoelomates. Relation between coelom type and regeneration is elaborated. Indirect life cycle with feeding larval stages increases the scope for speciation"--

Reproduction and Development in Minor Phyla Book

Reproduction and Development in Minor Phyla


  • Author : T J Pandian
  • Publisher : CRC Press
  • Release Date : 2021-05-14
  • Genre: Science
  • Pages : 302
  • ISBN 10 : 9781000284584

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Reproduction and Development in Minor Phyla Excerpt :

The 26 recognized minor phyla comprise aberrant clades, as most of them terminate as blind offshoots. Untied from the discussion on their phylogenesis of minor phyla, this book is largely devoted, for the first time, to aspects of reproduction and development in minor phyletics. The minor phyla are not as speciose (1,795 species/phylum) as the major phyla (157,066 species/phylum) are. The accumulation of deleterious genes causes inbreeding depression among progenies arising from parthenogenesis, clonal multiplication and selfing hermaphrodites. The reason for the limited species diversity in minor phyla is traced to (i) eutelism in 65.7% of minor phyletics and (ii) existence of 21.6% clonals, (iii) 6.4% parthenogens and (iv) 1.2% selfing hermaphroditism. Gonochorism obligately requires motility to search for a mate. The combination of low motility and gonochorism from Placozoa to hemocoelomatic minor phyla has limited diversity to

Reproduction and Development in Crustacea Book

Reproduction and Development in Crustacea


  • Author : T. J. Pandian
  • Publisher : CRC Press
  • Release Date : 2016-04-05
  • Genre: Nature
  • Pages : 315
  • ISBN 10 : 9781498748292

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Reproduction and Development in Crustacea Excerpt :

Dating back to the early Cambrian period, crustaceans had ample time to undertake endless experimentation with form and function. Today, no other group of plants or animals on the planet exhibit the range of morphological diversity seen among extant Crustacea. With more than 52,000 species, they are placed fourth in terms of overall species diversity. This book comprehensively elucidates the reproduction and development of all the taxonomic groups of Crustacea and bridges the gap between conventional zoologists and molecular biologists. Reproductive modes from the point of embryonic stem cells and primordial germ cells is discussed with a special section on cysts.

Evolution and Speciation in Animals Book

Evolution and Speciation in Animals


  • Author : T. J. Pandian
  • Publisher : CRC Press
  • Release Date : 2021-09-23
  • Genre: Nature
  • Pages : 346
  • ISBN 10 : 9781000405606

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Evolution and Speciation in Animals Excerpt :

This book represents the first attempt to quantify environmental factors and life history traits that accelerate or decelerate species diversity in animals. About 15%, 8% and 77% of species are distributed in marine (70% of earth’s surface), freshwater (terra firma fosters more diversity. The harsh hadal, desert and elevated montane habitats restrict diversity to 0.5-4.2%. Costing more time and energy, osmotrophic and suspension modes of food acquisition limit diversity to Selfing hermaphrodites (0.9%), parthenogens ( Incidence of heterogamety is four-times more in males than in females. Hence, evolution is more a male-driven process. Egg size is determined by environmental factors, but lecithality is genetically fixed. In poikilotherms, sex is also determined by gene(s), but differentiation by environmental factors. The extra-ovarian vitellogenesis (> 96%), spermatozoan (81%) rather than spermatophore mechanism of sperm transfer, promiscuity and polygamy over monogamy, iteroparity (99.6%) over semelparity and internal fertilization (84%) are preferred, as they accelerate diversity. Body size and egg size determine fecundity. Indirect life cycle (82%) and incorporation of feeding larval stages accelerate diversity. Brooding and viviparity (6.4%) decelerate it. Parasitism extends life span and liberates fecundity from eutelism. Evolution is an ongoing process, and speciation and extinction are its unavoidable by-products. The in-built conservation mechanism of reviving life after a sleeping duration has been reduced from a few million years in microbial spores to a few thousand years in plant seeds and a few hundred years in dormant eggs in animals. Hence, animal conservation requires priority. The existence of temperature-resistant/insensitive individuals, strains and species shall flourish during the ongoing global warming and earth shall continue with such burgeoning species, hopefully inclusive of man.

Reproduction and Development in Platyhelminthes Book

Reproduction and Development in Platyhelminthes


  • Author : T J Pandian
  • Publisher : CRC Press
  • Release Date : 2021-09-30
  • Genre: Uncategoriezed
  • Pages : 320
  • ISBN 10 : 1032175729

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Reproduction and Development in Platyhelminthes Excerpt :

This book provides a comprehensive synthesis of all aspects of Reproduction and Development in Platyhelminths covering from Acoela in Turbellaria to Taenioidea in Cestoda. It elaborates the life cycle and characteristics of different platyhelminthic taxa.

Reproduction and Development in Platyhelminthes Book

Reproduction and Development in Platyhelminthes


  • Author : T. J. Pandian
  • Publisher : CRC Press
  • Release Date : 2020-01-28
  • Genre: Science
  • Pages : 306
  • ISBN 10 : 9781000054880

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Reproduction and Development in Platyhelminthes Excerpt :

This book is a comprehensive elucidation on aspects of reproduction and development in platyhelminthes covering from acoelids to taeniids. With the unique presence of neoblasts, turbellarians serve as a model for studies on cancer and senescence. Of ~ 27,000 species, ~ 77% are parasites; they are harmful to man and his food basket from livestock and fish. The stress hormone, cortisol level is responsible for susceptibility and resistance of the host. In digeneans, the propagatory multiplication potency is retained by all the larval forms and in either direction in sporocyst. The higher clonal diversity, mixing and selection in Second Intermediate Host (SIH) may purge inbreeding depression suffered by the fluke on propagatory multiplication in First Intermediate Host (FIH). Of 12,012 digeneans, 88% may engage 33,014 potential SIH species. They have the choice to select one among the available/awaiting 3.5 host species. The motility of vertebrate host and euryxenic flexibility/scope for selection of SIH species has increased lineage diversification in digeneans. The life cycle of cestodes is divided into aquatic and terrestrial patterns. The former includes (i) oncosphere and (ii) coracidium types and the latter (iii) hexacanth-cysticercoid, (iv) hexacanth-tetrathyridium and (v) hexacanth-cysticercus types. The share for the oncosphere, coracidium and hexacanth types is 17.0, 29.5 and 46.5%, respectively. The staggering fecundity and adoption of the intermediate host in the herbivorous/insectivorous food chain have enriched Taenioidea as the most (2,264) speciose order. Sex specific genes Smed-dmd 1 and macbol have been identified, and neuropeptides and dipeptides are involved in sexualization. Trematodes are unable to parasitize elasmobranchs, as they cannot suck body fluid/blood containing a high level of urea. Relatively higher fecundity supplemented with propagatory multiplication, incorporation of SIH in 88% species, clonal selection in SIH, and euryxenic flexibi

Invertebrate Embryology and Reproduction Book

Invertebrate Embryology and Reproduction


  • Author : Fatma El-Bawab
  • Publisher : Academic Press
  • Release Date : 2020-01-18
  • Genre: Science
  • Pages : 931
  • ISBN 10 : 9780128141151

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Invertebrate Embryology and Reproduction Excerpt :

Invertebrate Embryology and Reproduction deals with the practical and theoretical objectives of the descriptive embryology of invertebrates, along with discussions on reproduction in these groups of animals. It explains several morphological and anatomical expressions in the field and covers the embryology of invertebrate animals, starting from the Protozoa, to the Echinodermata, the Protochordate and Tunicates. These groups include economically important aquatic invertebrates, such as crustaceans, as well as medically important invertebrates and economic arthropods. Each chapter is preceded by the taxonomy of the discussed phylum and/or the species to enable the reader to locate the systematic position. Covers phylum definition, general characteristics, classification, reproduction, agametic reproduction, gametic reproduction, spawning, fertilization, development and embryogenesis Includes recent findings in the area, along with detailed figures and photos that illustrate important concepts Brings together difficult-to-obtain research data from the field, not only in Egyptian libraries, but globally, and previously only found through specialized references not widely available Clarifies descriptions with striking photos and electron microscopical studies of different species

Developmental Biology Book

Developmental Biology


  • Author : M.A. SUBRAMANIAN
  • Publisher : MJP Publisher
  • Release Date : 2019-06-20
  • Genre: Science
  • Pages : 246
  • ISBN 10 : 978186723xxxx

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Developmental Biology Excerpt :

1. INTRODUTION, 2. HISTORICAL REVIEW AND THEORIES OF DEVELOPMENTAL BIOLOGY, 3. GAMETOGENESIS, 4. ORGANIZATION OF EGG—POLARITY, SYMMETRY AND GRADIENTS, 5. OVULATION AND EGG TRANSPORT, 6. FERTILIZATION, 7. EGG CORTEX AND DEVELOPMENT—CORTICAL REACTIONS AND THEORIES OF FERTILIZATION, 8. PARTHENOGENESIS—VIRGIN BIRTH, 9. CLEAVAGE, 10. FATE MAPS AND CELL LINEAGE—PRESUMPTIVE AREAS AND THEIR SIGNIFICANCE, 11. MORPHOGENETIC MOVEMENTS AND GASTRULATION, 12. CELL DIFFERENTIATION, 13. GERM LAYERS AND ORGANOGENESIS, 14. INDUCTION (ORGANIZER CONCEPT), 15. FOETAL MEMBRANES OR EXTRA-EMBRYONIC MEMBRANES IN AMNIOTES (CHICK AND PIG), 16. IMPLANTATION AND PLACENTATION IN MAMMALS (EUTHERIAN MAMMALS), 17. TERATOLOGY, 18. PRENATAL DIAGNOSIS OF ABNORMALITIES, 19. METAMORPHOSIS, 20. REGENERATION, 21. REPRODUTIVE AND DEVELOPMENTAL PATTERNS IN INVERTEBRATES, 22. INVERTEBRATE LARVAE AND THEIR SIGNIFICANCE.

Encyclopedia of Reproduction Book

Encyclopedia of Reproduction


  • Author : Anonim
  • Publisher : Academic Press
  • Release Date : 2018-06-29
  • Genre: Medical
  • Pages : 3868
  • ISBN 10 : 9780128151457

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Encyclopedia of Reproduction Excerpt :

Encyclopedia of Reproduction, Second Edition comprehensively reviews biology and abnormalities, also covering the most common diseases in humans, such as prostate and breast cancer, as well as normal developmental biology, including embryogenesis, gestation, birth and puberty. Each article provides a comprehensive overview of the selected topic to inform a broad spectrum of readers, from advanced undergraduate students, to research professionals. Chapters also explore the latest advances in cloning, stem cells, endocrinology, clinical reproductive medicine and genomics. As reproductive health is a fundamental component of an individual’s overall health status and a central determinant of quality of life, this book provides the most extensive and authoritative reference within the field. Provides a one-stop shop for information on reproduction that is not available elsewhere Includes extensive coverage of the full range of topics, from basic, to clinical considerations, including evolutionary advances in molecular, cellular, developmental and clinical sciences Includes multimedia and interactive teaching tools, such as downloadable PowerPoint slides, video content and interactive elements, such as the Virtual Microscope

Modern Text Book of Zoology  Invertebrates Book
Score: 4
From 6 Ratings

Modern Text Book of Zoology Invertebrates


  • Author : Prof. R.L.Kotpal
  • Publisher : Rastogi Publications
  • Release Date : 2012
  • Genre: Zoology
  • Pages : 883
  • ISBN 10 : 8171339034

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Modern Text Book of Zoology Invertebrates Excerpt :

The Biology of Reproduction Book

The Biology of Reproduction


  • Author : Giuseppe Fusco
  • Publisher : Cambridge University Press
  • Release Date : 2019-10-10
  • Genre: Medical
  • Pages : 490
  • ISBN 10 : 9781108499859

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The Biology of Reproduction Excerpt :

A look into the phenomena of sex and reproduction in all organisms, taking an innovative, unified and comprehensive approach.

Sexual Reproduction in Animals and Plants Book

Sexual Reproduction in Animals and Plants


  • Author : Hitoshi Sawada
  • Publisher : Springer
  • Release Date : 2014-02-07
  • Genre: Science
  • Pages : 480
  • ISBN 10 : 9784431545897

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Sexual Reproduction in Animals and Plants Excerpt :

This book contains the proceedings of the International Symposium on the Mechanisms of Sexual Reproduction in Animals and Plants, where many plant and animal reproductive biologists gathered to discuss their recent progress in investigating the shared mechanisms and factors involved in sexual reproduction. This now is the first book that reviews recent progress in almost all fields of plant and animal fertilization. It was recently reported that the self-sterile mechanism of a hermaphroditic marine invertebrate (ascidian) is very similar to the self-incompatibility system in flowering plants. It was also found that a male factor expressed in the sperm cells of flowering plants is involved in gamete fusion not only of plants but also of animals and parasites. These discoveries have led to the consideration that the core mechanisms or factors involved in sexual reproduction may be shared by animals, plants and unicellular organisms. This valuable book is highly useful for reproductive biologists as well as for biological scientists outside this field in understanding the current progress of reproductive biology.

A Textbook of Invertebrate Zoology Book

A Textbook of Invertebrate Zoology


  • Author : M. D. L. Srivastava
  • Publisher : Unknown
  • Release Date : 1962
  • Genre: Invertebrates
  • Pages : 777
  • ISBN 10 : CORNELL:31924003406034

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A Textbook of Invertebrate Zoology Excerpt :