• Invertebrates
  • Encyclopaedia of Echinodermata

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    Large non- food particles are moved by club-shaped spines and passed posteriorly off the body. The principal synapo- morphies of this group include the structure of the an- tenna, with its lack of muscles beyond the first segment (scape); the presence of a group of special chordotonal organs (vibration sensors) in the second antennal seg- ment (pedicel); a well developed posterior tentorium (forming a transverse bar); coxae subsegmented (or an- nulated); females with ovipositor formed by go- napophyses (limb-base endites) on segments 8 and 9; and long, annulated, posterior terminal filaments (cerci).
  • Invertebrates
  • Tropical Zooplankton (Developments in Hydrobiology)

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    Skara and many other Orsten Crustacea were probably meiofaunal ani- mals not unlike modern marine meiofaunal crustaceans. Based on fossil ev- idence, sea urchins (Euchinoidea) are more diverse today than anytime in the past. Record your result in the top box under Trial #3. The coordination of these waves is apparently due largely to hydrodynamic effects gener- ated as each cilium moves. The hindgut, or cloaca, is a proctodeum and varies in structure among different species.
  • Invertebrates
  • Indicators and Surrogates of Biodiversity and Environmental

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    Cyclopoids are known from fresh and salt water, and most are planktonic. Blood function in the hydrothermal vent vestimentiferan tube worm. Molecular phylogeny of the major arthropod groups indicates polyphyly of crustaceans and a new hypothesis for the origin of hexapods. The biology of limpets: Physical factors, energy flow and ecological interactions. The func- tion of the madreporite has been the subject of much controversy. In addition, the outside openings (spiracles) of the tracheae are often equipped with some mechanism of closure.
  • Invertebrates
  • Course in Invertebrate Zoology: A Guide to the Dissection

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    You can only upload videos smaller than 600MB. They attach to the skin or gills of the host fish by a sticky mucus, hooks, or other attachment devices. Thus, a variety of kinds of data are available to provide systematists with characters with which to define and compare species and higher taxa. The female reproductive system consists of a single pair of ovaries located posterior to the male system (Figure 13.19C and 13.36B).
  • Invertebrates
  • California Wasps of the Subfamily Philanthinae (Bulletin of

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    Note the states of contraction of longitudinal muscles (stippled), the body curvature, and the retraction and extension of parapodia. (B–D) Nereis crawling and swim- ming. Note the ciliated intestinal groove. (F) A nephridium of Phascolosoma (section). Motile gastropods usually possess a pair of closed statocysts in the anterior region of the foot. Some are powerful fliers, using wings to propel themselves, but others, particularly the smallest invertebrates, float on the slightest breeze.
  • Invertebrates
  • The physiology of trematodes (University reviews in biology,

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    Fine structure, reconstruction, and possible functions of the cortex of Tetrahymena pyriformis. Within this clade are two major groups: the oligochaetes and the hirudinoideans. Most possess metanephridia or, less commonly, protonephridia 7. The middle mantle fold is sensory in function, and the outer fold is responsible for secret- ing parts of the shell. Finally you see that while I was splitting the cycle up into finer and finer pieces, I was also building a structure.
  • Invertebrates
  • Australian Seafood Handbook (Imported Species): An

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    In most adult crustaceans only a single pair of nephridia (nephromixia) persists, usually associated with particular segments of the head (i.e., as antennal glands or maxillary glands) (Figure 15.27A). The fine structure of gnathostomulid reproductive organs I. Typically with unique tornaria larva. 11. Females tend to reject the advances of other males after they have consumed one mate. They are often pests that get into various stored food products or con- sume insect and plant collections; some species live in books and eat the bindings.
  • Invertebrates
  • Ghost Moths of Southern South America (Lepidoptera:

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    Many hemipterans exhibit cryptic coloration or mimic other insects; ant mimicry is espe- cially common. His mastery of crustacean comparative anatomy and morphology led him to produce classic, provocative studies such as on structural homology of the telson and on the evolution of stalked eyes. A seminal receptacle often lies near the ovary at the proximal end of the oviduct. Morphologically, the introvert allows the animal to keep its trunk, which is full of essential viscera, stationary while the introvert may be extended and retracted as it searches for food in sediments.
  • Invertebrates
  • New Frontiers in Crustacean Biology (Crustaceana Monographs)

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    When this breakdown occurs outside the body altogeth- er, it is called extracorporeal digestion; when it occurs in a gut chamber of some sort, it is referred to as extra- cellular digestion; and when the process occurs within a cell, it is called intracellular digestion. Left: Phymactis florida (sea anemone), MCZ SC-50; Center: Sabella penicillus (marine fan worm), MCZ SC-203; Right: Physalia caravella (Man-of-War jelly), MCZ SC-132 For decades, the MCZ's Blaschka glass invertebrates were stored in the relevant departmental collection by taxa, as their primary and original use was for teaching and morphological comparison.
  • Invertebrates
  • Rocky Mountain Bugs: Family Field Guide Series, Volume 4

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    Subsequent to gut formation, five pairs of archenteric coelomic pouches are said to appear off the gut, reminis- cent of the enterocoelous development of many deu- terostomes. He blamed the conflict between fact and theory on “the imperfection of the geologic record.” In his time, the science of paleontology (fossil study) was just getting under way. The in- terested student is directed to the references at the end of this chapter, especially papers by Ulrich Ehlers. Cteno- phores lack a hard skeleton, an excretory system, and a respiratory system.