81. Barnacles Article by Wim van Egmond on the life cycle and development of the barnacle with several interesting photographs. http://www.microscopy-uk.org.uk/mag/artjan99/barnac.html

BARNACLES 'Living on the edge' By Wim van Egmond Visiting a tide pool is always a wonderful experience. Living in this zone between land and water is continues struggle against the forces of the ocean. One of the most interesting inhabitants of the tidal area is the barnacle. It lives in the upper zone where the water only comes at high tide. The barnacle's appearance is rather deceptive. At first glance it looks like a mollusk. It has a white shell made of calcium carbonate. But when you observe the larva of the barnacle their true nature becomes visible. The first stage of the larval development reveals that we are dealing with a small crustacean instead of a mollusk. This so-called Nauplius stage closely resembles the larvae of a Copepod. You can recognize the larva of the barnacle by the two little 'horns'. After the Nauplius stage has lived some time swimming in the coastal plankton it undergoes a surprising transformation. The Nauplius larva of a barnacle Cypris larva of a barnacle The next stage is called the Cypris larva because it resembles a member of another group of crustaceans

82. Pollicipes Exercise from Invertebrate Anatomy OnLine covering the systematics and external and internal anatomy of this goose barnacle, with additional notes on Lepas anatifera. http://webs.lander.edu/rsfox/invertebrates/pollicipes.html

TEXT ONLY PRINT Home Invertebrate Anatomy OnLine ... Invertebrate Anatomy OnLine Invertebrate Anatomy OnLine Pollicipes polymerus Goose Barnacle with notes on Lepas anatifera Richard Fox Lander University Preface This is one of many exercises available from Invertebrate Anatomy OnLine an Internet laboratory manual for courses in Invertebrate Zoology. Additional exercises can be accessed by clicking on the links to the left. A glossary and chapters on supplies and laboratory techniques are also available. Terminology and phylogeny used in these exercises correspond to usage in the Invertebrate Zoology textbook by Ruppert, Fox, and Barnes (2004). Hyphenated figure callouts refer to figures in the textbook. Callouts that are not hyphenated refer to figures embedded in the exercise. The glossary includes terms from this textbook as well as the laboratory exercises. Systematics Arthropoda P , Mandibulata, Crustacea sP , Eucrustacea, Maxillopoda SC , Progonomorpha, Thecostracomorpha, Thecostraca, Cirripedia C , Thoracica O , Lepadomorpha sO , Scalpellidae F (Fig 16-15, 19-89, 19-90)

83. Balanus Exercise from Invertebrate Anatomy OnLine covering the systematics and external and internal anatomy of this acorn barnacle. http://webs.lander.edu/rsfox/invertebrates/balanus.html

TEXT ONLY PRINT Home Invertebrate Anatomy OnLine ... Invertebrate Anatomy OnLine Invertebrate Anatomy OnLine Balanus eburneus Acorn Barnacle Richard Fox Lander University Preface This is one of many exercises available from Invertebrate Anatomy OnLine an Internet laboratory manual for courses in Invertebrate Zoology. Additional exercises can be accessed by clicking on the links on the left. A glossary and chapters on supplies and laboratory techniques are also available. Terminology and phylogeny used in these exercises correspond to usage in the Invertebrate Zoology textbook by Ruppert, Fox, and Barnes (2004). Hyphenated figure callouts refer to figures in the textbook. Callouts that are not hyphenated refer to figures embedded in the exercise. The glossary includes terms from this textbook as well as the laboratory exercises. Systematics Arthropoda P , Mandibulata, Crustacea sP , Eucrustacea, Maxillopoda SC , Progonomorpha, Thecostracomorpha, Thecostraca, Cirripedia C , Thoracica O , Balanomorpha sO , Balanoidea SF, Balanidae F (Fig 16-15, 19-89, 19-90)

84. Megabalanus Coccopoma Taxonomy and description of the titan acorn barnacle, its habitat and distribution, life history, physical tolerances, community ecology and invasion information. http://www.sms.si.edu/irlspec/Megabalanus_coccopoma.htm

Back to Animals Back to Maxillopoda ... Back to Completed Reports List Species Name: Megabalanus coccopoma Common Name: Titan Acorn Barnacle I. TAXONOMY Kingdom Phylum/Division: Class: Order: Family: Genus: Animalia Arthopoda Maxillopoda Sessilia Balanidae Megabalanus The non-native titan acorn barnacle, Megabalanus coccopoma . Photograph courtesy South Carolina DNR. M. coccopoma present in the hard-fouling community at Mayport Naval Station Beach, Jacksonville, FLorida. Photograph courtesy jaxshells.org. Species Name: Megabalanmus coccopoma Darwin,1854 Common Name(s): Titan Acorn Barnacle Synonymy: Studies are ongoing to determine if Megabalanmus coccopoma and the Asian-Pacific species M. rosa are the same species (Powers et al. 2006). If so, the native range and introduced distribution of the species will need to be reassessed. Species Description: The titan acorn barnacle Megabalanmus coccopoma , is not native to the Atlantic but now occurs along the U.S. Atlantic coast and in the Gulf of Mexico. It is a very large balanid (acorn barnacle family), pink in color and growing to over 5 cm in height and width (Kerckhof 2002, Jaxshells Potentially Misidentified Species: A number of non-native balanid barnacles occur in Florida and have introduced ranges that potentially overlap that of Megabalanmus coccopoma . The Mediterranean barnacle Megabalanus antillensis Balanus tintinnabulum ) and the Pacific barnacle Balanus trigonus are two such species that are similar in color to

85. Balanus Amphitrite Taxonomy and description of the striped barnacle, its habitat and distribution, life history, physical tolerances, community ecology and invasion information. http://www.sms.si.edu/irlspec/Balanus_amphitrite.htm

Back to Animals Back to Maxillopoda ... Back to Completed Reports List Species Name: Balanus amphitrite Common Name: Striped Barnacle I. TAXONOMY Kingdom Phylum/Division: Class: Order: Family: Genus: Animalia Arthropoda Maxillopoda Sessilia Balanidae Balanus The non-native striped barnacle, Balanus amphitrite . Photograph courtesy SFEI, Photograpger Andrew N. Cohen. B. amphitrite . Photograph courtesy SFEI, Photograpger Andrew N. Cohen. Species Name: Balanus amphitrite Darwin, 1854 Common Name(s): Striped Barnacle, Purple Acorn Barnacle, Amphitrite's Rock Barnacle. Synonymy: Darwin originally described 9 morphologically distinct Balanus amphitrite subspecies , but numerous subsequent revisions including genetic alalysis by Flowerdew (1985) currently recognize only a single subspecies worldwide. Species Description: The striped barnacle, Balanus amphitrite , is a medium-sized surface-fouling, sessile barnacle with distinct vertical bands of purple stripes on it's protective rigid housing plates, known as capitulum plates. It is conical in appearance and largest at the base, with a diamond-shaped opening protected by a movable opercular lid composed of two symmetrical triangular halves. Each of these halves contains two plates, the tergum and the scutum. The operculum opens when is the lid halves are flexed out to the sides (Cohen 2005). B. amphitrite

86. MarLIN - The Marine Life Information Network Photograph and information on this acorn barnacle including its taxonomy, general biology and reproduction. http://www.marlin.ac.uk/speciesinformation.php?speciesID=2718

87. MarLIN - The Marine Life Information Network Photograph and information on Montagu s Stellate Barnacle including its taxonomy, general biology and reproduction. http://www.marlin.ac.uk/speciesinformation.php?speciesID=2981

88. MarLIN - The Marine Life Information Network Photograph and information on Poli s Stellate Barnacle including its taxonomy, general biology and reproduction. http://www.marlin.ac.uk/speciesinformation.php?speciesID=2982

89. MarLIN - The Marine Life Information Network Photograph and information on this acorn barnacle including its taxonomy, general biology and reproduction. http://www.marlin.ac.uk/speciesinformation.php?speciesID=4328

90. Barnacles - Life On Australian Seashores A useful guide to Australian barnacles and their biology, providing for each species a description and details of distribution, habitat and biology. http://www.mesa.edu.au/friends/seashores/barnacles.html

Barnacles Barnacles are most unusual animals. They are arthropods , in the same major group as insects and spiders, and are most closely related to decapod crabs , prawns, lobsters and yabbies. Unlike most of their relations, barnacles are usually fixed to a rocky surface. The larvae go through several distinct swimming stages as plankton, before settling into place onto a rock. The juveniles pick their place to settle because they can detect their adults by chemical means. Adult rock barnacles are protected by four, six or eight calcareous plates, which form a volcano-like cover. The top entrance is covered by another two plates. When feeding, these two top plates open and basket-like cirri limbs wave into the oncoming current of water and direct food into the mouth. Barnacle Reproduction and Life Cycle Barnacles do not release their gametes into the sea, but are able to fertilise one another. Barnacles are hermaphrodytic , which means that a single animal has both male and female parts.

91. Ostracoda Information on these small shrimps which form part of the marine plankton and are frequently found as fossils, with photographs of a number of these. http://www.gaultammonite.co.uk/Pages/Ostracoda/Albian_Ostracoda.htm

Gault Microfossils Phylum: Crustacea Class: OSTRACODA The Class Ostracoda, sometimes known as "seed shrimps", are small laterally compressed Crustacea enclosed within a protective shell. This shell is formed by two chitinous or calcareous valves that hinge above the dorsal region of the body. These creatures have adapted to various niches in the ocean plankton, on the sea floor, in freshwater ponds and even in humid forest soils. They are commonest, however, as shallow marine benthos, where they may number only less than the foraminifera amongst the fossil microfauna. Ostracods are particularly useful for the biozonation of marine strata on a local or regional scale and second to none as indicators of ancient shorelines, salinities and relative sea-floor depths. They have a long and well documented fossil record from the early Cambrian to the present day. The Ostracoda are found in large numbers all through the Gault Clay and at several levels they are even more abundant than the Foraminiferida and easily collected by sampling the clay at almost any level, thoroughly drying this, then soaking in water, washing through a fine mesh (100mu or above) and sorting the dried residue under a low-power binocular microscope . The specimens illustrated below were selected from bulk-samples taken at various levels in the Middle and Late Albian at Folkestone. Images have been produced using a Nikon 990 CookPix digital camera attached to a

92. Ostracoda Information on these segmented animals and their place in the fossil record. http://palaeo.gly.bris.ac.uk/Palaeofiles/Permian/ostracoda.html

Ostracoda -Segmented animals with carapace consisting of chitin or calcium carbonate. -Range in size from 0.5-10mm in size. -Anterior portion of carapace consists of two valves, inside which the rest of the anmal resides. -Classification according to the bivalved section which is moulted at regular intervals to allow growth as with other arthopods. -Fairly poor global fossil record with fossils only found in sporadic, localised beds. -Permian beds have upto 35 genera, with 87 species of Ostracoda. -Beds of Triassic age contain 88 genera which are different from those in the Permian, with no evidence of the Permian genera. -Suggests that there was mass extinction of Ostracoda, with only a few genera surviving through to Triassic. These rapidly diversified to form the Triassic generas. Back to index.

93. Ostracods Information on these ubiquitous organisms including their fossil record, classification, biology and life cycle with a number of images of individual species. http://www.ucl.ac.uk/GeolSci/micropal/ostracod.html

Ostracods Introduction Ostracods are by far the most complex organisms studied within the field of micropalaeontology. They are Metazoa and belong to the Phylum Arthropoda (as trilobites), Class Crustacea (as lobsters and crabs). An important distinguishing feature Ostracods share with other arthropods is the bilateral symmetry of their body form. The paired body parts are enclosed in a dorsally hinged carapace composed of low magnesium calcite, which is what is commonly preserved in the fossil record. They are found today in almost all aquatic environments including hot springs, caves, within the water table, semi-terrestrial environments, in both fresh and marine waters, within the water column as well as on (and in) the substrate. In fact almost anywhere that's wet, even if only for a brief period! History of Study The oldest generic names given to ostracods are Cypris and Cythere by Muller in the 1770's and 80's, these are now commonly used as suffixes and prefixes in ostracod nomenclature. In the 1860's Sars classified ostracods as an order divided into four suborders, Podocopa, Myodocopa, Cladocopa and Platycopa. In the early 20th Century workers in the Appalachians in the U.S.A classified Palaeozoic ostracods. In 1958 Pokorny combined these two classifications and in 1961 an Anglo American treatise modified Pokorny's work to give the foundation of today's classification system. It was not until Pokorny's work that the fossil and living classifications were linked. Range Ostracod-like organisms (bivalved arthropods) are recorded from the Cambrian, but it is uncertain whether these can be classified as true ostracods. Myodocopid and podocopid forms are recorded from the Ordovician. All these early forms are marine, the first freshwater forms (Darwinulacea and Carbonita) occur in the Carboniferous and by the Jurassic ostracods are common in freshwater environments. Between the Silurian/Devonian and the present there are big gaps in the fossil record of planktonic marine forms, which is thought to reflect weak calcification of the carapace.

94. About IRGO: International Research Group Ostracoda An interdisciplinary, international organization of research scientists studying living and fossil Ostracoda. Its purpose is to advance our knowledge of Ostracoda and to facilitate communication among researchers. http://userpage.fu-berlin.de/~palaeont/irgo/irgoabout.html

IRGO THE I NTERNATIONAL R ESEARCH G ROUP ON O STRACODA THE INTERNATIONAL RESEARCH GROUP ON OSTRACODA The International Research Group on Ostracoda (IRGO) is an interdisciplinary, international organization of about 400 research scientists studying living and fossil Ostracoda . Its purpose is to advance our knowledge of Ostracoda and to facilitate communication among researchers. IRGO is an official working group of the International Palaeontological Association under the International Council of Scientific Unions and UNESCO. This voluntary association, which began as the Committee on Recent Ostracoda , was founded at a meeting in Naples in 1963. There are no dues, and no formal membership list is kept. IRGO sponsors the International Symposia on Ostracoda , which are held at intervals of approximately three years. The proceedings for these symposia have been published separately. IRGO sponsors an annual newsletter, Cypris , which collects research news through a network of national correspondents. There is an electronic discussion list

95. Urzeitkrebse Classification and description of three orders Anostraca, Notostraca, and Conchostraca. http://mailbox.univie.ac.at/erich.eder/UZK/index2.html

wrong link! click here. wrong link! click here.

96. Triops Exercise from Invertebrate Anatomy OnLine covering the systematics, external and internal anatomy of this tadpole shrimp. http://webs.lander.edu/rsfox/invertebrates/triops.html

TEXT ONLY PRINT Home Invertebrate Anatomy OnLine ... Invertebrate Anatomy OnLine Invertebrate Anatomy OnLine Triops longicaudatus Tadpole Shrimp Richard Fox Lander University Preface This is one of many exercises available from Invertebrate Anatomy OnLine an Internet laboratory manual for courses in Invertebrate Zoology. Additional exercises can be accessed by clicking on the links to the left. A glossary and chapters on supplies and laboratory techniques are also available. Terminology and phylogeny used in these exercises correspond to usage in the Invertebrate Zoology textbook by Ruppert, Fox, and Barnes (2004). Hyphenated figure callouts refer to figures in the textbook. Callouts that are not hyphenated refer to figures embedded in the exercise. The glossary includes terms from this textbook as well as the laboratory exercises. Systematics Arthropoda P , Mandibulata, Crustacea sP , Eucrustacea, Thoracopoda, Phyllopodomorpha, Phyllopoda, Notostraca O , Triopsidae F (Fig 16-15, 19-18, 19-90) Arthropoda P Arthropoda, by far the largest and most diverse animal taxon, includes chelicerates, insects, myriapods, and crustaceans as well as many extinct taxa such as Trilobitomorpha. The segmented body primitively bears a pair of jointed appendages on each segment. The epidermis secretes a complex cuticular exoskeleton which must be molted to permit increase in size. Extant arthropods exhibit regional specialization in the structure and function of segments and appendages but the ancestor probably had similar appendages on all segments. The body is typically divided into a head and trunk, of which the trunk is often further divided into thorax and abdomen.

97. Artemia Exercise from Invertebrate Anatomy OnLine covering the systematics and external and internal anatomy, behavior and larvae of this brine shrimp. http://webs.lander.edu/rsfox/invertebrates/artemia.html

TEXT ONLY PRINT Home Invertebrate Anatomy OnLine ... Invertebrate Anatomy OnLine Invertebrate Anatomy OnLine Artemia franciscana Brine Shrimp Richard Fox Lander University Preface This is one of many exercises available from Invertebrate Anatomy OnLine an Internet laboratory manual for courses in Invertebrate Zoology. Additional exercises can be accessed by clicking on the links to the left. A glossary and chapters on supplies and laboratory techniques are also available. Terminology and phylogeny used in these exercises correspond to usage in the Invertebrate Zoology textbook by Ruppert, Fox, and Barnes (2004). Hyphenated figure callouts refer to figures in the textbook. Callouts that are not hyphenated refer to figures embedded in the exercise. The glossary includes terms from this textbook as well as the laboratory exercises. Systematics Arthropoda P , Mandibulata, Crustacea sP , Eucrustacea, Thoracopoda, Phyllopodomorpha, Anostraca C , Artemiidae F (Fig 16-15, 19-90) Arthropoda P Arthropoda, by far the largest and most diverse animal taxon, includes chelicerates, insects, myriapods, and crustaceans as well as many extinct taxa such as Trilobitomorpha. The segmented body primitively bears a pair of jointed appendages on each segment.

98. CLADOCERA Offers an illustrated body plan of a daphnia or water flea, with a numbered key, and details of the major features of its anatomy. http://www.cladocera.de/cladocera/cladocera.html

HOME CLADOCERA TAX+IMAGES ROTIFERA ... LIPARIAN CLADOCERA About 450 species, 0.2 - 6 mm (Leptodora kindtii 18 mm). The group of the Cladocera is a subdivision of the large aquatic arthropod class, the crustacea. Within these, the cladocera are subsumed in a group which is called Phyllopoda (gr.= leave-like feet). This is due to a phylogenetic reorganisation of the arthropod extremity which in the Cladocera no more shows the typical pattern of distinctive parts but resembles more a leave-like structure. Cladocera mainly inhabit fresh waters, only eight species are real marine animals. Their main feeding source is phytoplankton which they filter through the hole left by the carapax. Body Plan Cladocerans consist of a head, a thorax and an abdomen. The head is applied with a rostrum in whose vicinity usually the chemosensoric antennulae are located. Additionally, for male animals the antennulae serve to hold the female in position for copulation. From the thorax the 5 or 6 pairs of legs bud off. The abdomen shows in the embryonic stage and in adult Leptodora four segments. To it, a so called postabdomen is appended which ends in furca claws. These claws function as abreptor (cleaning the body cavity). Two rudder bristles are also appended to the abdomen. BACK TO TOP Side view of Daphnia.

99. The Water-Flea Circus Of The Micropolitan Museum Photograph gallery of about ten species of waterflea. http://www.microscopy-uk.org.uk/micropolitan/fresh/flea/index.html

100. Water-flea Anatomy - First Page A mouse-over image of Daphnia longispina that enables identification of its anatomical features, with close-up images of many of them. http://www.microscopy-uk.org.uk/mag/artmar02/fleanatomy.html

Water-flea anatomy - by Wim van Egmond, The Netherlands This is a mouse-over image of Daphnia longispina , a common water-flea. Use the underlying image to examine its main anatomical features! brightfield version of Daphnia close-up head and eyes ... Daphnia Water-fleas are easy to find. Most ponds will provide enough of these small crustaceans. They are ideal subjects for study under the microscope. You can examine them swimming under a low power stereo-microscope. When observed with stronger magnification it is best to use a deep slide. You can add dots of vaseline to the corners of the coverslip to prevent the water-flea being damaged. It is wonderful to see the heart beating and the blood flowing! The body of a water flea is protected by a shell-like carapace. This looks like two valves but consists of one piece. It covers the five pairs of leaf-like legs. These are used to filter food but also bear gills. At the end of the body (abdomen) we find the post abdomen with a paired claw (furca). It is used to remove unwanted particles between the carapace. Find about more about them in the Micscape article Water fleas All comments to the author Wim van Egmond are welcomed.

A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z

Page 5     81-100 of 104    Back | 1  | 2  | 3  | 4  | 5  | 6  | Next 20