Treatise on Zoology: Anatomy, Taxonomy, Biology. the

Format: Hardcover

Language: English

Format: PDF / Kindle / ePub

Size: 5.12 MB

Downloadable formats: PDF

The hyponeural system generally parallels the nerves of the ectoneural system. As mentioned earlier, the great success of spiders seems to have been due in large part to the evolution of complex behaviors associated with silk and web produc- tion. PHYLUM ARTHROPODA: THE CHELICERIFORMES 43UNCORRECTED PAGE PROOFS The circulatory system includes an elongate heart with incurrent ostia, but no blood vessels. Entwurf einer Darstellung der zwischen dem Embry- ozustande der höheren Tiere und dem Permanenten der niedere stattfindenen Parallele: Beitrüage zur vergleichenden Anatomie, Vol. 2.

Progress in Vitellogenesis

Format: Hardcover

Language: English

Format: PDF / Kindle / ePub

Size: 5.15 MB

Downloadable formats: PDF

The keystone of phylogenetic systematics is the recognition that all homologues de- fine monophyletic groups at some level. Müller) and its phylogenetic significance. By avoiding direct exposure to very dry conditions, the branchial chambers always re- main moist, so diffusion of respiratory gases continues even during low tides. Males of some species of wolf spiders (Lycosidae) re- spond to pheromones emitted along with the female’s dragline. Zoologists are usually identified by the group of animals they specialize in.

Textbook of Crustacea

Format: Hardcover

Language: English

Format: PDF / Kindle / ePub

Size: 7.68 MB

Downloadable formats: PDF

In complete metamorphosis, larval stages specialized for eating and growing change morphology completely during the pupal stage and emerge as adults. It is surrounded by a ring of hollow tentacles, which are well-endowed with cnidocyte batteries. The brain of the horseshoe crab (Limulus polyphemus). In the males, the gonopore is associated with two or three cuticular, hollow, penile spines (spicules) that presumably aid in copulation.

Australian Weevils (Coleoptera Curculionoidea): Anthribidae

Format: Hardcover

Language: English

Format: PDF / Kindle / ePub

Size: 13.37 MB

Downloadable formats: PDF

The infusoriform larvae escape from the parent vermiform adult and pass out of the host’s body with the urine. Associated with this large body size is an elaboration of the intestine. The fossil record suggests that most species of marine invertebrates per- sist more or less unchanged for 5–10 million years, whereas the time required for significant anatomical change seems to be only a few thousand years or less. Jarosz, “Immune phenomena in echinoderms,” Archivum Immunologiae et Therapiae Experimentalis, vol. 48, no. 3, pp. 189–193, 2000.

Handbook of Genetics: Volume 1 Bacteria, Bacteriophages, and

Format: Paperback

Language: English

Format: PDF / Kindle / ePub

Size: 12.27 MB

Downloadable formats: PDF

The largest whorl is the body whorl, which bears the aper- ture through which the foot and head protrude. From the hemo- coel, blood is channeled back to the pericardial sinus and the heart. Efferent vessels carry oxygenated blood to a large branchiopericardial vessel leading back toward the heart. Projects using bacteria as a tool to study another subject belong in that subject. 16. It also makes you realize why preserving and balancing nature is critical to human survival.

New Zealand Coastal Marine Invertebrates: Volume 1

Format: Hardcover

Language: English

Format: PDF / Kindle / ePub

Size: 14.38 MB

Downloadable formats: PDF

Many live in humid or wet environ- ments, or are active only during cool periods. In such cases the nephridium is often very glandular and served by afferent and efferent hemolymph vessels, and wastes are removed largely from the circulatory fluid. Evolutionary Ecol- ogy in Temperate and Tropical Regions. View at Publisher · View at Google Scholar P. Cen- tipedes may be the only animals with legs modified into poison-injecting claws. Available: http://www.npwrc.usgs.gov/resource/distr/insects/dfly/index.htm.

Parasitism: The Diversity and Ecology of Animal Parasites

Format: Paperback

Language: English

Format: PDF / Kindle / ePub

Size: 11.89 MB

Downloadable formats: PDF

Evolutionarily, the ectoprocts have exploited asexual reproduction, colonialism, and small size (Box 21B). Archives available at http://www.vims.edu/~jeff/archive.htm =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= ------------------------------ Date: Wed, 27 Jan 1999 09:01:31 -0500 From: "Alan W. Early Phanerozoic annelid worms and their ge- ological and biological significance. Habitat: Octopuses live in coastal marine waters and spend much of their time in dens--small holes and crevices in rocks and coral.

Rotifera IX: Proceedings of the IXth International Rotifer

Format: Paperback

Language: English

Format: PDF / Kindle / ePub

Size: 13.65 MB

Downloadable formats: PDF

However, they also multiply when glucose is absent. How, or if, these waste- filled cells are ever actually eliminated from the body re- mains an unanswered question. If you are thinking of developing your own expertise in a particular taxon and leveraging your power in giving names to new species you discover as a way to meeting up with your favorite celebrity, you will have to get familiar not only with your organism, but also with rules of taxonomic nomenclature.

Functional Biology of Free-Living Protozoa (Functional

Format: Hardcover

Language: English

Format: PDF / Kindle / ePub

Size: 10.33 MB

Downloadable formats: PDF

Experimental evidence indicates that physi- cal contact is not necessary for such a spawning re- sponse; thus, some sort of pheromone is probably involved. The champion swimmers are, of course, the cephalopods (Figure 20.22). Ascidian larvae possess several sensory receptors that function in settling and probably substratum selection, but are absent from the adults. Subsequent increase in body size thus occurred by the development of loops or bulges in the middle portion of the gut region, producing thereby a charac- teristic visceral hump.

Invertebrate Immunity: Mechanisms of Invertebrate

Format: Hardcover

Language: English

Format: PDF / Kindle / ePub

Size: 11.22 MB

Downloadable formats: PDF

T. enabled her to pursue a growing passion for bryophyte diversity while focusing on Polar environments. Note the circumoral ring canal that connects the meridional and paragastric (pha- ryngeal) canals. (D,E) Order Beroida, Beröe. (D) Side view. When the cuticular projec- tions are touched, that movement is translated into a de- formation of the nerve ending, thereby initiating a nerve impulse. Paul Andersen briefly surveys members of the Domain Animalia.