The Biology and Management of Lobsters: Ecology and - download pdf or read online


By J Stanley Cobb; Bruce F Phillips

ISBN-10: 0080917348

ISBN-13: 9780080917344

This two-volume paintings offers a precis and overview of the present kingdom of lobster biology, ecology, body structure, habit, and administration. It emphasizes the biology of clawed lobsters (Nephropidae) and spiny lobsters (Palinuridae), with realization additionally given to slipper lobsters (Scyllaridae) and coral lobsters (Synaxidae).The first bankruptcy of quantity 1 presents an outline of the overall features of lobster biology Read more...

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Phillips, J . S . C o b b , a n d R. W . G e o r g e Fig. 5. Postulated palinurid evolution. Positive fossil records are indicated in black, probable records are dotted. The form of the front of the carapace and of the endopod of the female pleopod on the second abdominal segment is illustrated for the living genera. ) Palinurus have a comple x and heterogeneou s gelatinou s spermatophori c mass . The more recentl y evolved Panulirus specie s have a further specializatio n in the developmen t of a granular , puttylike mass that harden s in seawater , wherea s Jasus has an unspecialize d level of developmen t of the spermatophori c mass .

After passing through the tissues, the blood collects in sinuses and is carried to the sternal sinus in the thorax. From there it flows to the afferent branchial sinuses in the gills, to the superficial plexuses in the gill filaments, to the efferent branchial sinus of the gill, and thence to the brachiocardiac sinus, which returns the blood to the pericardial cavity. Full details of the anatomy of the circulatory system are given by Brown ( 1 9 5 0 ) and by Maynard ( 1 9 6 0 ) . Total blood volume is variable but averages about 2 0 % of the wet weight o f the animal.

Americanus. As Macmillan (1975) has pointe d out, the pereiopod s articulat e with the body properwithin the protecte d region of the gill chamber , and the body is in fact suspende d from the legs rather than being proppe d up by them. There are seven joints in each pereiopod , and each acts as a simple hinge, flexing in only one plane. The great mobility of the leg is gained by the offsettin g of the plane of movemen t of each joint. In the norma l walking posture , each of the four pereiopod s has a slightly differen t orientatio n with respec t to the body.

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The Biology and Management of Lobsters: Ecology and Management Vol. 1 by J Stanley Cobb; Bruce F Phillips

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