Invertebrates

Plant Nematodes of Agricultural Importance: A Color Handbook

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This suspension-feeding larva soon elongates, with the three body regions becoming externally apparent (Fig- ure 23.12). Previous investigations have found numerous invertebrates, including cephalopods, crustaceans, and more than a hundred other species … reproductive strategy used by benthic seamount species. Small nemerteans commonly live among the interstices of filamentous algae or in the spaces of other irregular surfaces such as those found in mussel beds and sand, mud, or pebble bottoms.

Invertebrate Neurobiology (Cold Spring Harbor Monograph

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Ecology of Protozoa: The Biology of Free-Living Phagotrophic Protists. You can only upload files of type PNG, JPG, or JPEG. Burrowers in soft sediments. (e.g., Polyphysia) FAMILY SPIONIDAE: Body thin, elongate, homo- nomous; peristomial palps long and coiled; pharynx unarmed. Parasitic or free-living, unsegmented worms. (The subclass Eucestoda, in the class Cestoda, is strobilated.) 2. Origin of Bilateria; LOWER INVERTEBRATES — 19. C. (The venerated scarab of early Egyptians was actually a dung beetle.) Some common coleopteran families include Cara- bidae (ground beetles), Dytiscidae (predaceous diving beetles), Gyrinidae (whirligig beetles), Hydrophilidae (water scavenger beetles), Staphylinidae (rove beetles), Cantharidae (soldier beetles), Lampyridae (fireflies and lightning bugs), Phengodidae (glowworms), Elateridae (click beetles), Buprestidae (metallic wood-boring bee- tles), Coccinellidae (ladybird beetles), Meloidae (blister beetles), Tenebrionidae (darkling beetles), Scarabaeidae (scarab beetles, dung beetles, June “bugs”), Cerambyci- dae (long-horned beetles), Chrysomelidae (leaf beetles), Curculionidae (weevils), Brentidae (primitive weevils), and Ptiliidae (featherwinged beetles, the smallest of all beetles, some with body lengths of just 0.3 mm).

Prospects of Organic Waste Management and the Significance

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Eggs are produced mainly on the ex- terior of the ovaries, giving them a bubbled texture; how they move to the internal ovarian lumen is not well un- derstood. Bring the beauty of Africa into your home. Watch and play along for your chance to win a Safari to Tanzania from National Geographic Expeditions. Entoprocts possess duct- ed gonads, ectoprocts do not. The absorptive surfaces of Nectonema sp. (Nematomorpha: Nectonematoidea) from Pandalus 384 CHAPTER TWELVE UNCORRECTED PAGE PROOFS montagui: Histology, ultrastructure, and absorptive capabilities of the body wall and intestine.

Area-Wide Control of Insect Pests: From Research to Field

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Der DNA-Gehalt der Zellen bei dem primitiven Metazoon Trichoplax adhaerens F. She provided an important foundation for our understanding of the collection’s history and of the history of science in general, including the worldviews behind them. It is widely reported online that these crabs have been seen on land, but I can find no reliable sources for this and it seems unlikely they would be able to support themselves out of the water. When a larva finds a suitable substratum, it develops into a sessile adult.

The Life Cycles of an Earthworm (Life Cycles Library)

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The cI protein combines with the operator, Or. Transcription is the process by which an RNA polymerase produces single-stranded RNA complementary to one strand of DNA or, rarely RNA. The flagellated cells pocket inward to form a chamber lined with cells destined to become choanocytes (Figure 6.16F). Buck Stockhausen ************************************************************************* *William T. Kitchen Science Experiments: How Does Your Mold Garden Grow? (Mad Science) by Sudipta Bardhan-Quallen is part of a series of books that has more fun ideas related to the fungi and microscopic worlds.

Invertebrate Palaeontology And Evolution

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Members of the genus Argulus occur worldwide, but members of the other genera have restricted distribu- tions. The three major events depicted are: acquisition of an aerobic heterotrophic prokaryote (origin of mitochondrion); acqui- sition of a spirochate or spiroplasma-like prokaryote (origin of flagellum); and acquisition of an autotrophic prokaryote (origin of chloroplast). Typical Lifespan: An octopus will generally live for about 1-3 years, depending on the species.

The Hamlyn Guide to Shells of the World

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Minute (to 3 mm); ter- mite-like; colonial; wingless or with two pairs of wings; wings eventually shed; antennae moniliform, 9-articu- late; abdomen short, oval, 10-segmented; chewing mouthparts; simple development. On the dor- sal surface of the pharynx is a longitudinal curved ridge called the dorsal lamina, or a row of ciliated projections called languets, or both (Figure 23.15A,B). Also, with phyllopodous thoracopods (all simi- lar to one another); no maxillipeds; large carapace covering thorax and compressed laterally so as to from an unhinged bivalved “shell,” with an adductor muscle; cephalon with a movable, articulated ros- trum; pleopods 1–4 similar and biramous, 5–6 unira- mous; no uropods; paired stalked compound eyes; antennules biramous; antennae uniramous; adults with both antennal and maxillary glands (Figures 16.5, 16.21C).

Zooplankton of the Atlantic and Gulf Coasts: A Guide to

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One macrostomid, Haplopharynx rostratus, possesses a mi- nute anal pore, and some polyclads have pores at the ends of gut branches; some proseriates (e.g., Taboata) may form a temporary anus. Others (e.g., Pycnogonum litorale, P. rickettsi) feed on sea anemones in a similar fashion, but rarely kill them due to the large difference in size between predator and prey. The exact stimulus apparently varies among different species and may include such factors as changes in day length, temperature, food resources, or increases in population density.

Biochemical Parasitic Helminths

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The striking dark-striped white body of Synaptula lamperti makes an attractive picture against the colored background of the sponges on which they are exclusively found. (Photo by Robert Fenner) Although attractive to look at, you should resist any urge to purchase a species of Synaptula because most feed by mopping tiny particles of organic detritus and secretions from the surface of living sponges. The second segment is the premandibular seg- ment; it lacks appendages but houses the tritocerebrum.

The Sound of a Wild Snail Eating

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UNCORRECTED PAGE PROOFS Males tend to be smaller than females and are often sharply curved posteriorly. Extending from the mouth at the center of the oral surface are rows of podia associated with ambulacral grooves (Figure 22.2), which define body radii called ambulacra. The outer cells are now called ectoderm, and a double-layered hollow coelogastrula has been formed. Primarily cylindrical or funnel shaped deep-water marine sponges.