Larvae and Evolution: Toward a New Zoology (Protected Areas

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The discovery that organisms with a cell nucleus constitute a natural group di- vided the living world neatly into two categories, the prokaryotes (those organ- isms lacking membrane-enclosed organelles and a nucleus, and without linear chromosomes), and the eukaryotes (those organisms that do possess membrane- bound organelles and a nucleus, and linear chromosomes). Predation occurs in some freshwater oligochaetes, which capture prey by a sucking action of their muscular pharynx.

Common Marine Invertebrates of the North-western Gulf Coast

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Primarily fresh water, but also some marine, estuarine, and semiterrestrial species; with a variable number of adhesive tubes; pharyngeal pores absent; one pair of protonephridia usually present; most are parthenogenetic (males are unknown). Many just don’t quite fit their classifications. Alternative Energy (Junior Division Only): Studies of power generation using alternative energy technologies such as solar cells. Origin of bi- laterian body plans: Evolution of developmental regulatory mech- anisms.

Desert Channels: The Impulse to Conserve

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Mireille started with the Alberta Biodiversity Monitoring institute in 2008 as a field technician and then joined the lichen team at the Royal Alberta Museum in 2011; she enjoys learning something new about lichen almost every day! Roch, “Formation of brown bodies in the coelomic cavity of the earthworm Eisenia fetida andrei and attendant changes in shape and adhesive capacity of constitutive cells,” Developmental and Comparative Immunology, vol. 16, no. 2-3, pp. 95–101, 1992.

Monograph of Living Chitons (Mollusca: Polyplacophora):

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Attendance: Students missing 20% of lectures (6 lectures) OR labs (3 labs) shall be dropped from the class per the SRSU catalog. Posterior to the rhynchodeum, the lumen continues as the proboscis canal, that is surrounded by the muscu- lar wall of the proboscis itself; these mus- cles are derived from the muscles of the body wall. Clicking here will take you to McGraw-Hill’s eBookstore and the ebook of the Pechenik text.

Earthworm Biology (New Studies in Biology)

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Trophozoites of E. histolytica may live and multiply indefi- nitely within the crypts of the mucosa of the large intestine, apparently feeding on starches and mucous secretions. However, I would like to quote a popular quote to finish that in evolution specialization paralyses and ultra specialization kills the viability of taxons. Interns can attend the Oklahoma Academy of Science fall and spring field meetings (which meet at state parks) as part of their internships and may also participate in BioBlitz! during the fall semester.

Respiratory Physiology of Vertebrates

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The stylets anchor the worm to its host and the large glands secrete an anticoagulant. Clicking the thumbnail opens the content in your browser or other appropriate application. The evolution of a mesoderm greatly expanded the evolutionary potential for animal complexity. The differences should be apparent in larger specimens, but this is not necessarily so for very small crabs, which is why gonopores are useful.

Zoological Catalogue of Australia (Zoological Catalogue of

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The median (anterior) ocellus is thought to have arisen through the fusion of two separate ocelli, and it is inner- vated from both sides of the deutocerebrum. The Company of Biologists, Ltd., Cambridge. Note the dorsal and ventral aspects on the left and right sides of the drawing, respectively. Generally, these fall into three categories: molluscs were derived from (1) a flat- worm (turbellarian) ancestor, (2) a nonsegmented coelo- mate protostome ancestor, or (3) a segmented ancestor, perhaps even a common ancestor to the annelids.

Australian Weevils (Coleoptera: Curculionoidea) II:

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Bilateral, unsegmented, and probably blastocoelo- mate 2. Systematisierung der lebenden Natur aufgrund ihrer Phylogenese. Today there are five principal com- peting hypotheses of arthropod phylogeny (Figures THE EMERGENCE OF THE ARTHROPODS 43UNCORRECTED PAGE PROOFS The Three-Subphylum Classification of Arthropods (sensu Snodgrass 1938) Phylum Arthropoda Subphylum Trilobita Subphylum Chelicerata Class Merostomata Subclass Xiphosura Subclass Eurypterida Class Arachnida Class Pycnogonida Subphylum Mandibulata Class Crustacea Class Atelocerata (= Tracheata) Subclass Hexapoda Subclass Myriapoda The Five-Subphylum Classification of Arthropods Followed in This Book Phylum Arthropoda Subphylum Trilobitomorpha Subphylum Cheliceriformes Class Chelicerata Subclass Merostomata Order Eurypterida Order Xiphosura Subclass Arachnida Class Pycnogonida Subphylum Crustacea Subphylum Hexapoda Class Entognatha Class Insecta Subphylum Myriapoda BOX 15B Classification Schemes for the Arthropods *For a brief period of time in the mid-twentieth century (1955–1975) the concept of a polyphyletic Arthropoda, champi- oned mainly by S.

Marine Planktonic Ostracods (Synopses of the British Fauna)

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Nuclei contain permanently condensed chromo- somes; no histone proteins associated with DNA 5. Still, blood can flow backward and the system is only slightly more efficient than the open system of insects. They open to the outside via spiracles, or lung slits, near the epigastric furrow (Figure 19.5C). There are some interesting cases that reflect, again, the adaptive diversi- ty of these worms. Brown Company Publishers, Iowa. [Used as a source for names of non-decapod crustaceans] McLaughlin, P.

Distribution of the Marine Molluscs of North West Europe

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France (1997) concluded that in boreal headwater lakes, where large aquatic plants (vascular macrophytes) are rare, beaver lodges may be important in structuring littoral communities. The evolution and ecologic history of sponges dur- ing Palaeozoic times. Its detailed methodology has been formalized and expanded and will probably contin- ue to be elaborated for some time to come. (For good dis- cussions of cladistic systematics see Nelson and Platnick 1981, Eldredge and Cracraft 1980, and Wiley 1981.) The goal of phylogenetic systematics is to produce explicit and testable hypotheses of genealogical relationships among monophyletic groups of organisms.