Minibeasts in the Compost Heap (Where to Find Minibeasts)

Sarah Ridley

Format: Paperback

Language: 1

Format: PDF / Kindle / ePub

Size: 6.84 MB

Downloadable formats: PDF

Most gas- tropods have a small eye at the base of each cephalic tentacle, but in some, such as the conch Strombus, the eyes are enlarged and on long stalks. Keratella slacki eggs, in the presence of the preda- tor Asplanchna (both are rotifers), are stimulated to de- velop into larger-bodied adults with an extra long anterior spine, thus rendering them more difficult to eat. I placed it on black paper so it would be easier to see. Crustaceans have complex endocrine and neurose- cretory systems, although our understanding of these systems is far from complete.

Continue reading

Minibeasts in the Home (Where to Find Minibeasts)

Sarah Ridley

Format: Paperback

Language: 1

Format: PDF / Kindle / ePub

Size: 11.52 MB

Downloadable formats: PDF

Some hope lies in future studies on ultrastructure and development of those animals where information is still incomplete, and with the examination of new (nuclear) genes for molecular phylogenetic analysis. The mesenchyme contains both elastic sup- portive cells and muscle cells, the general tonus of the latter being primarily responsible for maintaining body shape. The exploitation of similar habitats by animals with different phylogenetic histories is frequently ac- companied by the appearance of convergent similarities.

Continue reading

Ecology and Morphology of Copepods: Proceedings of the 5th

Format: Paperback

Language: 1

Format: PDF / Kindle / ePub

Size: 10.89 MB

Downloadable formats: PDF

These are the invertebrate chordates, the subphyla Urochordata and Cephalochordata. Jonston (or Jonstonus) created the name Mollusca in 1650 for the cephalopods and barnacles, but this name was not ac- cepted until it was resurrected and redefined by Linnaeus. Diges- tion of cellulase by termites and certain wood-eating PHYLUM ARTHROPODA: THE HEXAPODA (INSECTS AND THEIR KIN) 27 Figure 17.20 The usual subdivisions of an insect gut. (A) The entire alimentary canal. (B) The junction of the foregut and midgut in a dipteran.

Continue reading

The Modern Coral Reef Aquarium, Volume 4 (v. 4)

Format: Paperback

Language: 1

Format: PDF / Kindle / ePub

Size: 9.70 MB

Downloadable formats: PDF

Listening lesson plans with mp3 files also available. Pseudotrachea UNCORRECTED PAGE PROOFS self, but as it passes along the plumbing system of the nephridium, a good deal of selective reabsorption oc- curs, particularly of salts and nutrients such as glucose. This allows the animal to retreat into the coelomic cavity or extend its introvert and nearly double its length. This set of classification cards includes the following: � 32 picture-label cards (one for each vertebrate or invertebrate: human, squirrel, pelican, sea lion, puma, snow wolf, camel, cardinal, tiger, killer whale, orangutan, elephant, turtle, fish, kangaroo, cow, dragonfly, snail, grasshopper, beetle, ant, jellyfish, octopus, earthworm, starfish, hermit crab, lobster, mosquito, moth, butterfly, sponge, lady bug). � 6 title cards (three for each category: vertebrates, invertebrates).

Continue reading

Insects on Nettles (Naturalists' Handbooks)

B. N. K. Davis

Format: Paperback

Language: 1

Format: PDF / Kindle / ePub

Size: 13.81 MB

Downloadable formats: PDF

Comparative morphology of the radulae and the alimentary tracts in the Aplacophora. Surv., Guide- book Series No. 6, pp. 125–132. About 72,000 specimens are currently on loan to other scientific institutions. Mollusca; Characters, Classification & Types; 61. All of the trunk segments are actually diplosegments, each formed by fusion of two somites and bearing a double complement of meta- meric organs and structure (Figure 18.2F) The head is fol- lowed by an expanded, limbless diplosegment called the collum, which forms a conspicuous, heavily sclerotized collar between head and trunk (Figure 18.2E).

Continue reading

A Manual of Acarology: Third Edition

Format: Paperback

Language: 1

Format: PDF / Kindle / ePub

Size: 5.21 MB

Downloadable formats: PDF

0 // Gloucester Point, VA 23062, USA > \\__\\ Many of these species apparently do not feed directly on the car- casses they inhabit, but on fungi and bacteria growing in the decomposing organic matter. Stato- cysts usually consist of a fluid-filled chamber contain- ing a solid granule or pellet called a statolith. Colonies with chitinous or gelatinous coverings; zooids cylin- drical, large, and monomorphic; epistome with protocoel present; lophophore large and horseshoe-shaped; body wall muscles well developed; metacoel extensions interconnect zooids; a cord of tissue, the funiculus, extends from the gut to the body wall, but not between zooids; most produce asexu- al bodies called statoblasts. (e.g., Cristatella, Hyalinella, Lopho- phus, Lophopodella, Pectinatella, Plumatellae.) CLASS STENOLAEMATA: Marine ectoprocts.

Continue reading

Honeybee Neurobiology and Behavior: A Tribute to Randolf

Format: Paperback

Language: 1

Format: PDF / Kindle / ePub

Size: 6.31 MB

Downloadable formats: PDF

Copulation has been observed in only a few onycho- phorans. In the freshwater groups Unionacea and Mutelacea, the embryos are also brooded between the gill lamellae, where they develop to the veliger stage. A muscular valve or other closing device is often present and is under control of internal partial pressures of O2 and CO2. The inner two membranes enclose the thylakoids and eyespot (if present); the outer two mem- branes enclose the nucleus. In all drawings, solid arrows indicate the direction of water flow (from inhalant space, between ctenidial filaments, to exhalant space). (A) Section through the gill axis in a pro- tobranch, with four alternating filaments (leaflets) on each side.

Continue reading

Physiological Approach to the Lower Animals

Format: Paperback

Language: 1

Format: PDF / Kindle / ePub

Size: 9.46 MB

Downloadable formats: PDF

Spiders, Scorpions, Centipedes and Mites: The Ecology and Natural History of Woodlice, Myriapods and Arachnids. Reptiles, birds, and mammals each have individual bauplan but share the vertebrate bauplan. Within the terrestrial and freshwater molluscan collections there is strong representation from the Nearctic, Neotropical, Pacific Island, Australian and European regions. Thus, the taxon Echinodermata is placed at the hierarchical level corresponding to the cat- egory phylum—Echinodermata is the taxon; phylum is the category.

Continue reading

True Bugs (Heteroptera) of the Neotropics (Entomology in

Format: Paperback

Language: 1

Format: PDF / Kindle / ePub

Size: 9.80 MB

Downloadable formats: PDF

This phenomenon is espe- cially common in certain taxa (e.g., cnidarians, ascidi- ans, ectoprocts) (Figure 3.34). The oligochaetes (earthworms and their kin) lack any unique defining synapomorphies; hence they are de- picted as the hypothetical direct ancestors of the hiru- dinidans (leeches and their kin)—that is, leeches proba- bly evolved from an oligochaetous ancestor. BIO 475 is an upper division course in parasite biology open to undergraduate and undergraduate students.

Continue reading

Nemerteans (Synopses of the British fauna)

Format: Paperback

Language: 1

Format: PDF / Kindle / ePub

Size: 13.39 MB

Downloadable formats: PDF

If properly orchestrated, the male’s “tune” eventually at- tracts the female, and contact is made. Some cubozoan medusae engage in a form of copula- tion, in which sperm are transferred directly from the male to an adjacent female in the water column. Robert D Barnes, 1987 invertebrate Zoology, Saunders College Publication ... Essner, “Microbodies: peroxisomes and glyoxysomes,” The Journal of Cell Biology, vol. 91, no. 3, pp. 271–283, 1981.

Continue reading