Category Archive: Invertebrates

Jun 14

Nemerteans (Synopses of the British fauna)

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The first true echinoderms may have been the heli- coplacoids, whose appearance was marked by the origin of triradial symmetry with three spirally arranged, open ambulacral grooves (3) and a water vascular system (4), probably with the madreporite opening near the mouth. Adam and Charles Black, London, pp. 1–178. For example, recent 18S rDNA mol- ecular studies suggest that the lophophorates are more closely aligned with the protostomes than the deuteros- tomes, despite embryological and anatomical evidence to the contrary (Halanych et al. 1995; Mackey et al. 1996).

Jun 14

Gene Function: E. coli and its heritable elements

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When a female anopheline mosquito takes a blood meal, she releases sporozoites into the victim’s bloodstream (1). I promise not to spam you because I am awesome (and clearly so are YOU). An electrophysiological study of the regulation of ciliary beating frequency in Paramecium. Sponges effectively increase their surface area by a process of complex branching and folding of the body, both internally and externally. Biomedical Importance of Marine Organisms.

Jun 14

Tortricidae, Part 2: Olethreutinae (Moths and Butterflies of

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Finally, various transient larval organs are lost, such as most of the larval nervous sys- tem and sense organs. Proboscis usually armed with distinct stylets and morpho- logically specialized into three regions (except in Bdellone- mertea); mouth and proboscis pore usually united into a com- mon aperture; mouth located anterior to cerebral ganglion; longitudinal nerve cords within mesenchyme, internal to body wall muscles. Two examples of conver- gent (nonhomologous) characters that are not included in our data matrix are the occurrence of “U-shaped guts” (e.g., sipunculans, lophophorates, tunicates) and the presence of “feeding tentacles around the mouth” (e.g., cnidarians, sipunculans, lophophorates, many pro- tostomes).

Jun 14

Freshwater Mussels of Florida

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Skeleton secreted within the epidermis and cov- ered by a thick epidermal layer; a calcareous style often rises from base of polyp cup, hence the name “stylas- terine”; polyps may have tentacles; free medusae not produced, but sessile medusoid gonophores retained in shallow chambers (ampullae) of colony; several dacty- lozooids surround each gastrozooid, although polyp pits are joined. These worms meet their nutritional requirements by absorbing some of the metabolic products of the bacteria.

Jun 13

Spiders of India

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Most roundworms are parasites and are found in all habitats. We may view this 8-celled embryo as four pairs of daughter cells that have been produced by the divisions of the four original macromeres as follows: It should be mentioned that even though the macro- meres and micromeres are sometimes similar in size, these terms are nonetheless always used in describing spiral cleavage. Adiyodi, Reproductive Biology of Invertebrates, Vol. 1.

Jun 13

Vector Biology, Ecology and Control

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They are most frequently found in marine and brackish water and are characterized by the presence of a test or skeleton with one to two chambers and a com- plex life cycle that involves an alternation of generations. This putative life cycle is schematically repre- sented in Figure 7.4. Protozoa comprise no more than a loose assemblage of heterotrophic, single-celled eu- karyotes. Thus the superficial annulations of the onychophoran body are external manifestations of the subcutaneous hemal channels.

Jun 13

Invertebrate Immune Responses: Cell Activities and the

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For example, in bivalves and gas- tropods, the hemocoel functions as a hydrostatic skeleton for locomotion and certain types of burrowing activities. The specimens (without their opisthosomas) were given to the eminent French zoologist Maurice Caullery, who studied them for nearly 50 years and published several papers describing these strange worms. The coelomocytes usually were located subdorsal and posterior to the genital primordium, C5 on the right and C6 on the left.

Jun 13

CSIRO Handbook of Australian Insect Names

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He actually questioned the car because “it gets fuel, mama, and it moves.” Yup, it does. Evaluating hypotheses of basal animal phylogeny using complete sequences of large and small subunit rRNA. ORDER CESTIDA: Figures 9.1C, 9.2I) Pelagic; body ex- tremely compressed in tentacular plane, and greatly elongat- ed in stomodeal plane, producing a ribbon-like form up to 1 m long in some species; substomodeal comb rows elongated, ex- tending along entire aboral edge; subtentacular meridional canals arise under subtentacular comb rows (Cestum) or equa- torially from interradial canals (Velamen); paragastric canals ex- tend along oral edge and fuse with meridional canals; tenta- cles and tentacle sheaths present.

Jun 13

Protozoa: A hand written note

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Ciliary fans for detection of water-borne vibra- tions. Siphonophora: comprende colonias flotantes, con formas diversas, caracterizadas por cuanto presentan algun elemento que les permite la flotabilidad ( gotas de aceite, cámara de gas etc.). Eventually the entire medusa splits in half and each part regenerates the miss- ing portions. There are a great many parasitic forms, including pathogens in most plants and animals, humans included.

Jun 12

Restocking and Stock Enhancement of Marine Invertebrate

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Sometimes, there may be flexible, sticky structures protruding from the glycocalyx, which are THE PROTISTS 157 Figure 5.33 Phylum Rhizopoda. In gastropods that produce egg capsules or egg cases, the males usually have a penis to facilitate transfer of sperm or spermatophores (Figures 20.5B and 20.47), and internal fertilization takes place prior to formation of the egg case. In spi- ders the cheliceral nerves actually emerge from the pro- tocerebrum, but they can be traced histologically to their origin in the hind part of the cerebral ganglia below the gut.

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