Hydra class zoology. The Class Hydrozoa is morphologically the most diverse group of cnidarians. Medusae are large, bell or umbrella-shaped, without true velum, free-swimming, or attached by an aboral stalk. Immortality 12. Nervous System 8. The non-anthozoan classes may be grouped into the subphylum Medusozoa. 🎯CLASS-9 || RETROGRESSIVE METAMORPHOSIS IN UROCHORDATA || ZOOLOGY || MAJOR-1 || PAPER-2 || In this video, we explain retrogressive metamorphosis in Urochordata in a simple and exam-oriented manner. The colonies of the colonial species can be large, and in some cases the specialized individual animals cannot survive outside the colony. Hydra (/ ˈhaɪdrə / HY-drə) is a genus of small freshwater hydrozoans in the phylum Cnidaria. Come find out about the phylum Cnidaria - jellyfish, hydra, and more! Also Refer: Budding Classification of Coelenterata Coelenterates are classified into three different classes: Anthozoa Hydrozoa Scyphozoa Hydrozoa These are mostly marine species, found exclusively in freshwater. Structure of Hydra 3. Hydras ar… Anthoathecata: pictures (35) Family Hydridae Hydridae: pictures (1) Genus Hydra Hydra: pictures (1) Genus Pelmatohydra Also Refer: Budding Classification of Coelenterata Coelenterates are classified into three different classes: Anthozoa Hydrozoa Scyphozoa Hydrozoa These are mostly marine species, found exclusively in freshwater. , Hydra The hydra-tuba remains unchanged for a long time, feeds and produces horizontal branches from which new hydra-tuba buds off. It includes aquatic organisms such as jellyfish, sea anemones, corals, and hydras. Hydra bodies are only two cell layers thick. Classification of Phylum Cnidaria: The phylum Cnidaria is a diverse group with cosmopolitan distribution. হাইড্রার পরিচিতি । HSC Zoology Chapter 2 | Introduction to Hydra | Fahad Sir Amader School 1. hydra hīˈdrə [key], common name for freshwater organisms in the phylum Cnidaria, which includes jellyfish, sea anemones, and corals. Structure 4. Gastrodermis 4. Hydra is a fascinating genus of tiny, freshwater animals within the Phylum Cnidaria and Class Hydrozoa. The body of such an organism consists of a thin, usually translucent tube that measures up to about 30 millimetres (1. This will also help you to draw the structure and diagram of hydra. Aug 13, 2025 · Hydra belongs to the Phylum Cnidaria and is classified under the Class Hydrozoa. They are solitary, carnivorous jellyfish-like animals, native to the temperate and tropi Hydra is a genus of small, freshwater cnidarians (coelenterates) which belongs to the class Hydrozoa. Cnidaria Cnidaria is one of the more primitive animal phyla. 2 inches) long but is capable of great contraction. Detailed previous studies using molecular techniques … Hydra is a genus of small freshwater hydrozoans of the phylum Cnidaria. Solved Questions For You Q: In which phylum, do organisms have nematocysts. The hydra moves either by creeping on its base or by looping, or flipping end over end. , Hydra Hydra has neither blood and blood vessels, nor organs of excretion and respiration, which are carried on individually by each cell. This places Hydra within a broad group that includes other aquatic animals like jellyfish, corals, and sea anemones. An excellent choice for pre-med, pre-vet and pre-health professions students, the concentration includes a highly regarded, two-semester human anatomy and physiology series and additional chemistry classes. Invertebrates belonging to the class Cubozoa are named for their cube-shaped medusae, which form the dominant part of their life cycle. In the idealized life cycle, during sexual reproduction, a larva (or planula) forms from the blastula. Hydra was first described by Antoni van Leeuwenhoek (1632–1723) in a letter he sent to the Royal Society on Christmas day, 1702. Hydrozoa (hydrozoans; from Ancient Greek ὕδωρ (húdōr) ' water ' and ζώα (zóa) 'animals') is a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water. Histology of the Body Wall 4. 3. ) benthic macroinvertebrate by exploring the life cycle, feeding habitats, interesting facts and its role in the food chain. Body Wall 2. The hydra-tuba and scyphistoma represent the hydroid phase of Aurelia. In addition to being related to such organisms as jellyfish, they are characterized by their tiny, tube-shaped bodies that contain several tentacles on one end. A sticky secretion at the “foot” enables hydras to cling to a surface. They are distinguished from other groups by their complex life cycle, by the growth of medusae from buds rather than Some Hydra species, like Hydra circumcincta and Hydra viridissima, are hermaphrodites and may produce both testes and ovaries at the same time. Food Habits Hydra oligactis , as in all Cnidaria, are strictly carnivorous and eat many different kinds of small metazoans, including annelids, copepods, cladocerans, and insects. Body differentiated into a long tubular trunk and a hypostome or mouth surrounded by a ring of long tentacles. They have regenerative abilities and can regrow from fragments, though some evidence suggests Perhaps the best-known hydrozoan, familiar to most students of introductory biology, is Hydra, pictured at left. 4. Belonging to the phylum Cnidaria and class Hydrozoa, these organisms are renowned for their regenerative abilities, unique feeding mechanisms, and ecological significance. Despite its relevance for fundamental research, Hydra's evolutionary origins and species level diversity are not well understood. Watch videos of the live benthics to see how they move and view pictures of their different life stages. A hydra is considered a predatory carnivore and hunts for larva, invertebrates, crustaceans, water fleas, and shrimp. Many members of the Hydrozoa go through a body change from a polyp to an adult form called a medusa, which is usually the life stage where sexual reproduction occurs, but Hydra do not progress beyond This phylum is further divides into three classes: Hydrozoa Scyphozoa Anthozoa Examples (Source: Wikipedia) Hydra Aurelia ( Jelly Fish) Physalia Meandrina Adamsia (Sea Anemone) Learn more about Phylum Echinodermata here in detail. Hydra can reproduce asexually through budding or sexually by releasing gametes. Finally it becomes segmented by transverse furrows and this stage is known as scyphistoma. Respiration and Excretion 7. Hydras are classified under the phylum Cnidaria; some of its relatives are jellyfish and sea anemones. Anthozoa is a class that consists of two subclasses, Hexacorallia (stony corals and sea anemones) and Octocorallia (soft corals and red corals). It is a fresh water form cosmopolitan in distribution. Hydroid, any member of the invertebrate class Hydrozoa (phylum Cnidaria). Hydra never goes through a medusoid stage and spends its entire life as a polyp. The mouth is rimmed with several long tentacles. A few genera within this The genus Hydra lies within the class Hydrozoa, making it an early divergent metazoan order. Reproduction 8. They feed by stinging prey with nematocysts on their tentacles. Locomotion 5. They have a columnar or trunklike body, which is structurally a bag (with the mouth at the top). Your Queries :- Spot Identification Of Hydra sp (Cnidaria) under microscope 40X#short#hydraspotidentification#spotide Here we have given Plus One Zoology Chapter Wise Questions and Answers Chapter 2 Animal Kingdom. Scyphistoma sometime multiplies by budding from stolons. Regeneration 11. Behaviour 9. The letter included a red chalk drawing of Hydra Hydras resemble tiny, delicate, elongated sea anemones. The Cockroach Test- Zoology, Class 11 questions and answers have been prepared according to the Class 11 exam syllabus. The hydra received its name after the Greek Hydra in mythology. Polyp stage reduced or absent. Through the body runs a cavity- the coelenteron The following points highlight the five main parts that make up the internal structure of Hydra. Hydras are widely distributed in lakes, ponds, and sluggish streams. E. Life-History 9. Like many cnidarians, hydrozoans have both polyp and medusa stages in their life cycle. Reproduction 10. A hydra has many tentacles around the mouth opening. Diversity The Hydrozoa is a subgroup of cnidarians containging approximately 3700 species. Hydra ( HY-drə) is a genus of small freshwater hydrozoans of the phylum Cnidaria. Examples include sea anemones (Figure 1), sea pens, and corals, with an estimated number of 6,100 described species. Contents: Habit and Habitat of Hydra Structure of Hydra Structure and Function of the Different Cellular Units of Hydra Locomotion of Hydra Nutrition The genus Hydra (Cnidaria, Hydrozoa) comprises a group of aquatic organisms that inhabit freshwater bodies worldwide, except for Antarctica. History of Hydra 2. Learn about the hydra (Coelenterata spp. Mesogloea 5. g. Habitat of Hydra 2. 43M subscribers Subscribe Department of Zoology at ANDC/Zoology Museum/Museum specimens/Cnidaria/Hydra Phylum Coelenterata (Cnidaria) is a diploblastic metazoa with tissue grade of construction having nematocyst and a single gastrovascular cavity. External Feature of Hydra 3. Macro photography of freshwater hydra (phylum Cnidaria, class Hydrozoa, genus Hydra) In this article we will discuss about Hydra:- 1. Most hydrozoans alternate between a polyp and a medusa stage — they spend part of their lives as "jellyfish" which are hard to distinguish The class Anthozoa (“flower animals”) includes sea anemones (Figure 1), sea pens, and corals, with an estimated number of 6,100 described species. Differentiate between the following: Budding in yeast and budding in Hydra - Zoology Advertisements Advertisements This organization ensures division of labor among cells, promoting efficient functioning and survival of the animal. Systematic Position Hydra: Systematic Position Phylum Coelenterata Class Hydrozoa Order Hydrozoid Suborder Anthomedusae Genus Hydra Species Hydra vulgaris Habits and Habitat 01. 2. Asexual Polyps is the dominant form. Class Anthozoa The class Anthozoa includes all cnidarians that exhibit a polyp body plan only; in other words, there is no medusa stage within their life cycle. Aug 3, 2023 · Hydra are inconspicuous freshwater relatives of corals, sea anemones, and jellyfish that are classified under the phylum Cnidaria, Class Hydrozoa, Order Anthomedusae/Anthoathecata, and Family Hydroidea. Contents: Habitat of Hydra External Feature of Hydra Histology of the Body Wall in Hydra Feeding and Digestion Process Hydra, a genus of simple yet fascinating freshwater invertebrates, has captivated the scientific community for centuries. Medusozoans is a subphylum that consists of four classes, Hydrozoa (freshwater Hydra), Scyphozoa (true jellyfish), Cubozoa (box jellyfish), and Staurozoa (stalked jellyfish). Kerala Plus One Zoology Chapter Wise Questions and Answers Chapter 2 Animal Kingdom Plus One Animal […] Biomedical science concentration coursework focuses on human and mammalian biology. Classification of Phylum Cnidaria 2. Body Wall: The body wall consists of two cellular layers, an outer epidermis derived from ectoderm and an inner gastro dermis derived from endoderm. Habit and Habitat of Hydra 2. hydra (hī´drə), common name for freshwater organisms in the phylum Cnidaria, which includes jellyfish, sea anemones, and corals. Habit, Habitat and Culture of Hydra 3. The genus Hydra belongs to the class Hydrozoa and includes 20 to 30 species. Hydras can glide slowly on their foot, or they can bend over and turn slow In this article we will discuss about:- 1. Sea anemones are usually brightly colored and can attain a size of 1. Explain their significance. It includes the familiar hydras, the transparent jelly fishes, the beautiful and bright coloured sea If scientists were to tell you that they’re researching an organism that does not age at all and regenerates itself, would you be interested? This is an overview of Hydra. This phylum includes corals, sea anemones and jellyfish. Hydra in Relation to Higher Metazoan. These creatures are notable for their simplicity, radial symmetry, and exceptional regenerative powers that make them the subject of extensive biological research. Did You Know? While humans have billions of cells working together, simple organisms like Hydra consist of different types of cells that perform basic functions in a much simpler way. Physiological Division of Labour. Introduction to Cnidaria phylum: general features, cnidocyte function, classification, and diversity of corals, jellyfish, and sea anemones. Hydra have a simple tubular body with a foot and mouth surrounded by tentacles. Although marine species vastly outnumber freshwater ones, the freshwater genus Hydra may nevertheless represent the best-known hydrozoan. In this article we will discuss about Hydra:- 1. It is found attached to aquatic weeds. What is Hydra (genus)? Hydra is a genus of small freshwater hydrozoan s of the phylum Cnidaria. Life History. Hydra reacts to various kinds of internal as well as external stimuli. Feb 9, 2026 · Hydra, genus of invertebrate freshwater animals of the class Hydrozoa (phylum Cnidaria). . 1. Mesogloea is acellular. In between the outer epidermis and inner gastro Like, Share & Subscribe For More Videos. Examples: Hydra, Tubularia, Obelia, Millepora , Physalia Class 2 : Scyphozoa (Greek skyphos=cup + zois=animal) It includes large jelly-fishes or true medusae that are exclusively marine. Hydra attach themselves to submerged rocks, leaves, and twigs, and stretch out their tentacles, or cnidae, to capture passing prey. Most cnidarians are marine, although a few, such as the well-known hydra, are freshwater species. In this article we will discuss about the structure of hydra. Structure and Function of the Different Cellular Units 4. Through the body runs a cavity- the coelenteron The genus Hydra has long served as a model system in comparative immunology, developmental and evolutionary biology. Most hydroids inhabit marine environments, but some hydroids have invaded freshwater habitats. Feeding and Digestion Process 5. Few are found in colonies and few are found solitarily. Hydra are a genus of small, fresh-water organisms that are classified under the phylum Cnidaria. 8 to 10 cm in diameter. They are native to the temperate and tropical regions. Respiration, Excretion and Osmoregulation 7. Symbiosis 13. Gastro vascular cavity. However, Hydra is not typical of the Hydrozoa as a whole. In this article we will discuss about the Phylum Cnidaria:- 1. Systematic Resume. Contents: History of Hydra Habit, Habitat and Culture of Hydra Structure What is Hydra? Hydra is a member of the animal phylum Cnidaria. The document summarizes key facts about Hydra, a genus of freshwater animal. Epidermis 3. The Cockroach Test- Zoology, Class 11 MCQs are made for Class 11 2026 Exam. Hydra capture their food by paralyzing and killing the food organism by means of nematocysts, which are discharged into the prey. PDF | The genus Hydra has long served as a model system in comparative immunology, developmental and evolutionary biology. Diagnostic Features of Phylum Cnidaria 3. While most cnidarians are marine, Hydra is unusual in that it lives exclusively in fresh water. It is a diverse group with a variety of life cycles, growth forms, and specialized structures. These animals are usually Hydrozoa (hydrozoans, from ancient Greek ὕδρα, hydra, "sea serpent" and ζῷον, zoon, "animal") are a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most living in salt water. (B) A labeled diagram of the external anatomical features of the Hydra. 30 Questions MCQ Test - Cockroach Test- Zoology, Class 11 Cockroach Test- Zoology, Class 11 for Class 11 2026 is part of Class 11 preparation. Locomotion 6. Hydroids may be either solitary or colonial, and there are about 3,700 known species. Respiration and Excretion Process 7. Scheme of Classification 4. Nutrition 6. The parts are: 1. ruvb, ujdy7, vc4t, o2pj, 6xfk, yedj5, tsdq, iocrp, ogmby, 9dcqzj,