An invertebrate is an animal lacking a vertebral column. The sea cucumber (also known as trepang, bêche-de-mer, or ambiguously Sea slug) is an Echinoderm of the class Holothuroidea Echinoderms (Phylum Echinodermata) are a phylum of marine Animals (including Sea stars) In Human anatomy, the vertebral column ( backbone or spine) is a column of 34 Vertebrae the Sacrum, Intervertebral The group includes 97% of all animal species[1] — all animals except those in the Chordate subphylum Vertebrata (fish, reptiles, amphibians, birds and mammals). In Biology, a species is one of the basic units of Biological classification and a Taxonomic rank. Chordates ( Phylum Chordata) are a group of Animals that includes the Vertebrates together with several closely related Invertebrates In life a subphylum is a Taxonomic rank intermediate between phylum and superclass. Vertebrates are members of the Subphylum Vertebrata, Chordates with backbones or spinal columns The grouping sometimes includes Fish are aquatic Vertebrate animals that are typically ectothermic (previously Cold-blooded) covered with scales, and equipped with two Reptiles, or members of the class Reptilia are air-breathing Cold-blooded Vertebrates that have skin covered in scales as opposed to hair or feathers Prehistoric amphibian Amphibians (class Amphibia such as Frogs Toads Salamanders Newts Gymnophiona, Sirens and Birds ( class Aves) are bipedal endothermic ( Warm-blooded) Vertebrate animals that lay eggs. Mammals ( class Mammalia) are a class of Vertebrate Animals characterized by the presence of Sweat glands, including sweat glands
Carolus Linnaeus' Systema Naturae divided these animals into only two groups, the Insecta and the now-obsolete vermes (worms). Carl Linnaeus (Latinized as Carolus Linnaeus, also known after his ennoblement as, May 23 new style (13 May old style 1707 who laid the foundations for The book Systema Naturae was one of the major works of the Swedish doctor of medicine Carolus Linnaeus. Insects ( Class Insecta) are a major group of Arthropods and the most diverse group of Animals on the Earth with over a million described Vermes (" Worms quot is an obsolete Taxon used by Carolus Linnaeus and Jean-Baptiste Lamarck for all non- Arthropod Invertebrate Worms (voɐms is a City in Rhineland-Palatinate, Germany, on the Rhine River Jean-Baptiste Lamarck, who was appointed to the position of "Curator of Insecta and Vermes" at the Muséum National d'Histoire Naturelle in 1793, both coined the term "invertebrate" to describe such and divided the original two groups into ten, by splitting off Arachnida and Crustacea from the Linnean Insecta, and Mollusca, Annelida, Cirripedia, Radiata, Coelenterata and Infusoria from the Linnean Vermes. Jean-Baptiste Pierre Antoine de Monet Chevalier de Lamarck ( August 1, 1744 &ndash December 18, 1829) was a French Soldier The Muséum national d'Histoire naturelle ( MNHN) is the French national Museum of Natural history. Arachnids are a class ( Arachnida) of joint-legged Invertebrate Animals in the subphylum Chelicerata. Structure of crustaceans As Arthropods crustaceans have a stiff Exoskeleton, which must be shed to allow the animal to grow ( Ecdysis or molting Molluscs are animals belonging to the phylum Mollusca. There are around 250000 extant Species within the phylum with an estimated 70000 The annelids, collectively called Annelida (from Latin anellus "little ring" are a large phylum of Animals comprising A barnacle is a type of Arthropod belonging to infraclass Cirripedia in the subphylum Crustacea, and is hence distantly related to The Radiata are the radially symmetric animals of the Eumetazoa subregnum Coelenterata is an obsolete long term encompassing two animal phyla, the Ctenophora (comb jellies and the Cnidaria ( Coral animals true Infusoria is a collective term for minute aquatic creatures like Ciliates euglenoids, Protozoa, and unicellular Algae that exist in freshwater They are now classified into over 30 phyla, from simple organisms such as sea sponges and flatworms to complex animals such as anglican bishops, arthropods and molluscs. A phylum ( Plural: phyla) is a Taxonomic rank between Kingdom and above Class. The sponges or poriferans (from Latin porus "pore" and ferre "to bear" are Animals The flatworms (Phylum Platyhelminthes from the Greek πλατύ platy, meaning "flat" and ἕλμινς (root ἑλμινθ- helminth- Arthropods are Animals belonging to the Phylum Arthropoda (from Greek ἄρθρον arthron, " Joint " Molluscs are animals belonging to the phylum Mollusca. There are around 250000 extant Species within the phylum with an estimated 70000
Invertebrates form a paraphyletic group. In Phylogenetics, a group of organisms is said to be paraphyletic if the group contains its most recent common ancestor but does not contain all (For a full list of animals considered to be invertebrates, see animal. ) All the listed phyla are invertebrates along with two of the three subphyla in Phylum Chordata: Urochordata and Cephalochordata. In life a subphylum is a Taxonomic rank intermediate between phylum and superclass. Chordates ( Phylum Chordata) are a group of Animals that includes the Vertebrates together with several closely related Invertebrates Tunicate, also known as urochordata, tunicata (and by the common names of urochordates, sea squirts, and sea pork) is the The lancelets (subphylum Cephalochordata, traditionally known as amphioxus) are a group of primitive Chordates. These two, plus all the other known invertebrates, have only one cluster of Hox genes, while the vertebrates have duplicated their original cluster more than once. A homeobox is a DNA sequence found within Genes that are involved in the regulation of patterns of development ( Morphogenesis) in Animals
Within paleozoology and paleobiology, invertebrates big and small are often studied within the fossil discipline called invertebrate paleontology. Paleozoology, also spelled as palaeozoology ( Greek: παλαιον paleon = old and ζωον zoon = animal is the branch of Paleontology Paleobiology (sometimes spelled palaeobiology) is a growing and comparatively new discipline which combines the methods and findings of the Natural science Biology FOSSIL is a standard protocol for allowing serial communication for Telecommunications programs under the DOS Operating system. Invertebrate paleontology (also spelled Invertebrate palaeontology) is sometimes described as Invertebrate paleozoology and/or Invertebrate paleobiology
Contents |
Phyla and common examples
- Annelida — segmented worms (earthworms, leeches, polychaetes)
- Arthropoda — insects, arachnids, crustaceans
- Cnidaria — jellyfishes, corals, sea anemones, hydras
- Echinodermata — starfish, sea urchins, sea cucumbers
- Mollusca — squid, snails, bivalves
- Nematoda — roundworms
- Nematomorpha — horsehair worms or gordian worms
- Platyhelminthes — flatworms
- Porifera — sponges
Macroinvertebrates
The term macroinvertebrates is traditionally used to refer to aquatic invertebrates including insects (e. The Beautiful Demoiselle Calopteryx virgo is a European Damselfly. Insecta {Taxobox | name = Damselflies| regnum = Animalia | phylum = Arthropoda | classis | ordo = Odonata | subordo = Zygoptera | subordo_authority The annelids, collectively called Annelida (from Latin anellus "little ring" are a large phylum of Animals comprising The annelids, collectively called Annelida (from Latin anellus "little ring" are a large phylum of Animals comprising Earthworm is the usual name for the largest members of Oligochaeta (which is either a class or subclass depending on the author in the phylum Annelida In classical Leeches are Annelids comprising the Subclass Hirudinea. There are freshwater terrestrial and marine leeches The Polychaeta or polychaetes are a class of Annelid worms generally marine Arthropods are Animals belonging to the Phylum Arthropoda (from Greek ἄρθρον arthron, " Joint " Insects ( Class Insecta) are a major group of Arthropods and the most diverse group of Animals on the Earth with over a million described Arachnids are a class ( Arachnida) of joint-legged Invertebrate Animals in the subphylum Chelicerata. Structure of crustaceans As Arthropods crustaceans have a stiff Exoskeleton, which must be shed to allow the animal to grow ( Ecdysis or molting Cnidaria (naɪˈdɛəriə is a phylum containing some 9000 Species of Animals found exclusively in aquatic mostly marine, environments Jellyfish are free-swimming members of the phylum Cnidaria. They have several different basic morphologies that represent several different cnidarian classes including the Corals are Marine organisms from the class Anthozoa and exist as small Sea anemone –like Polyps typically in colonies of many Sea anemones are a group of water dwelling predatory animals of the order Actiniaria; they are named after the Anemone, a terrestrial Flower Hydra is a Genus of simple fresh-water animals possessing radial symmetry. Echinoderms (Phylum Echinodermata) are a phylum of marine Animals (including Sea stars) Starfish (also called sea stars) are any Echinoderms belonging to the class Asteroidea. Sea urchins are small globular spiny sea cat animals composing most of class Echinoidea. The sea cucumber (also known as trepang, bêche-de-mer, or ambiguously Sea slug) is an Echinoderm of the class Holothuroidea Molluscs are animals belonging to the phylum Mollusca. There are around 250000 extant Species within the phylum with an estimated 70000 Squid are marine Cephalopods of the order Teuthida, which comprises around 300 species The word snail is a Common name that can be used for almost all members of the Molluscan class Gastropoda which have coiled shells in the Bivalves are Molluscs belonging to the class Bivalvia. They have two-part shells and typically both valves are symmetrical along the hinge line The nematodes or roundworms ( Phylum Nematoda from Greek (nema "thread" + -ode "like" are one of the most common The nematodes or roundworms ( Phylum Nematoda from Greek (nema "thread" + -ode "like" are one of the most common Nematomorpha (sometimes called Gordiacea, and commonly known as Horsehair worms or Gordian worms) are a Phylum of Parasitic Nematomorpha (sometimes called Gordiacea, and commonly known as Horsehair worms or Gordian worms) are a Phylum of Parasitic Nematomorpha (sometimes called Gordiacea, and commonly known as Horsehair worms or Gordian worms) are a Phylum of Parasitic The flatworms (Phylum Platyhelminthes from the Greek πλατύ platy, meaning "flat" and ἕλμινς (root ἑλμινθ- helminth- The flatworms (Phylum Platyhelminthes from the Greek πλατύ platy, meaning "flat" and ἕλμινς (root ἑλμινθ- helminth- The sponges or poriferans (from Latin porus "pore" and ferre "to bear" are Animals The sponges or poriferans (from Latin porus "pore" and ferre "to bear" are Animals Insects ( Class Insecta) are a major group of Arthropods and the most diverse group of Animals on the Earth with over a million described g. larval Ephemeroptera and Trichoptera), crustaceans (e. Mayflies are Insects which belong to the Order Ephemeroptera (from the Greek ephemeros = "short-lived" pteron Caddisflies, sedge-flies or rail flies (Order Trichoptera, from Greek trich, "hair" and ptera, "wings" Structure of crustaceans As Arthropods crustaceans have a stiff Exoskeleton, which must be shed to allow the animal to grow ( Ecdysis or molting g. amphipods), molluscs (e. Amphipoda (amphipods are an order of animals that includes over 7000 described Species of Shrimp -like Crustaceans ranging from 1 mm to 140 mm Molluscs are animals belonging to the phylum Mollusca. There are around 250000 extant Species within the phylum with an estimated 70000 g. aquatic snails) and worms (e. The word snail is a Common name that can be used for almost all members of the Molluscan class Gastropoda which have coiled shells in the A worm is a common name given to a diverse group of invertebrate animals that have a long soft body and no legs g. Platyhelminthes), which inhabit a river channel, pond, lake, wetland or ocean. The flatworms (Phylum Platyhelminthes from the Greek πλατύ platy, meaning "flat" and ἕλμινς (root ἑλμινθ- helminth- Historically, their abundance and diversity have been used as an indicator of ecosystem health and of local biodiversity. Biodiversity is the variation of Life forms within a given Ecosystem, Biome or for the entire Earth. They are a key component of the food chain. Food chains, also called food networks and/or trophic networks, describe the feeding relationships between species within an Ecosystem.
Most indices that are used to determine water quality rank the various forms of benthic macroinvertebrates with respect to pollution sensitivity. The benthic zone is the ecological region at the lowest level of a Body of water such as an Ocean or a Lake, including the sediment surface and some sub-surface The presence of pollution sensitive macroinvertebrates indicates that the body of water is healthy. Alternatively, the excessive presence of pollution tolerant macroinvertebrates indicates poor water quality. Ideally, a healthy body of water will hold an abundant and diverse macroinvertebrate population.
The macroinvertebrates traditionally seen as being pollution sensitive include: mayflies (Ephemeroptera), caddisflies (trichoptera), and stoneflies (Plecoptera). Mayflies are Insects which belong to the Order Ephemeroptera (from the Greek ephemeros = "short-lived" pteron Caddisflies, sedge-flies or rail flies (Order Trichoptera, from Greek trich, "hair" and ptera, "wings" Plecoptera are an order of Insects commonly known as stoneflies. The macroinvertebrates that have been traditionally considered pollution tolerant include: aquatic worms (Oligocheata), leeches (Hirudinea) and non-biting midges or commonly known as "blood worms" (Chironomidae).
Flow, food, habitat and water quality are the primary determinants of macroinvertebrate abundance and diversity. Food is any substance usually composed primarily of Carbohydrates Fats water and/or Proteins that can be eaten or drunk by an A habitat (which is Latin for "it inhabits" is an Ecological or environmental area that is inhabited by a particular Species. Water quality is the physical chemical and biological characteristics of Water in relationship to a set of standards Food sources include phytoplankton, biofilms (i. Phytoplankton are the Autotrophic component of the Plankton community A biofilm is a structured community of Microorganisms encapsulated within a self-developed polymeric matrix and adherent to a living or inert surface e. the layers of bacteria or other micro-organisms that cover submerged surfaces) and terrestrial organic material (e. g. leaves) that enter the water from the riparian vegetation. Major predation occurs from other macroinvertebrates and fish. Key habitats for macroinvertebrates are the benthic sediments, aquatic vegetation and woody debris. Salinity, temperature, dissolved oxygen, and turbidity have a significant impact. Salinity is the Saltiness or dissolved salt content of a body of Water. Temperature is a physical property of a system that underlies the common notions of hot and cold something that is hotter generally has the greater temperature Oxygen saturation is a relative measure of the amount of Oxygen that is Dissolved or carried in a given medium Turbidity is the cloudiness or haziness of a fluid caused by individual particles ( suspended solids) that are generally invisible to the Naked eye
There are many different kinds of arthropods. but they mainly have the structure of a segmented body and jointed legs.
See also
- Life Cycle of Macroinvertebrates
http://www.lakecountyohio.org/soil/monitoring_information.htm
Macroinvertebrates go through a life cycle in usually one season or less. The term " marine invertebrates " is used to describe animals found in a marine environment which are Invertebrates lacking a Notochord. They go through complete or incomplete metamorphosis. Learn more about the stages at this website.
References
Further reading
- Hyman, L. H. 1940. Libby Henrietta Hyman ( December 6, 1888 – August 3, 1969) was an American Zoologist. The Invertebrates (6 volumes) New York : McGraw-Hill. A classic work.
- Anderson, D. T. (Ed. ). (2001). Invertebrate zoology (2nd ed. ). Oxford: Oxford University Press.
- Brusca, R. C. , & Brusca, G. J. (2003). Invertebrates (2nd ed. ). Sunderland, Mass. : Sinauer Associates.
- Miller, S. A. , & Harley, J. P. (1996). Zoology (4th ed. ). Boston: WCB/McGraw-Hill.
- Pechenik, Jan A. (2005). Biology of the invertebrates. Boston: McGraw-Hill, Higher Education, 590 pp. ISBN 0072348992.
- Ruppert, E. E. , Fox, R. S. , & Barnes, R. D. (2004). Invertebrate zoology: a functional evolutionary approach. Belmont, CA: Thomas-Brooks/Cole.
External links
- A. R. Maggenti & S. Gardner (2005). Online Dictionary of Invertebrate Zoology.
- Support for endangered invertebrates
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