scholarly journals The diving bell and the spider: the physical gill of Argyroneta aquatica

2011 ◽  
Vol 214 (13) ◽  
pp. 2175-2181 ◽  
Author(s):  
R. S. Seymour ◽  
S. K. Hetz
Keyword(s):  
Physical Gill

The Function of Haemoglobin in Relation to the Maintenance of Neutral Buoyancy in Anisops Pellucens (Notonectidae, Hemiptera)

1966 ◽  
Vol 44 (3) ◽  
pp. 529-543 ◽  
Author(s):  
P. L. MILLER
Keyword(s):  
Temperature Sensitive ◽  
Gas Migration ◽  
Neutral Buoyancy ◽  
Tracheal System ◽  
Percentage Saturation ◽  
Ambient Oxygen ◽  
Normal Duration ◽  
Oxygen Tensions ◽  
Normal Respiration ◽  
Physical Gill

1. The percentage saturation of the haemoglobin of the intact water bug, Anisops pellucens, in equilibrium with various ambient oxygen tensions has been determined. From this an approximate dissociation curve for the pigment and a P50 value of 28 mm. Hg at 24° C. have been obtained. 2. Anisaps haemoglobmn shows no Bohr effect, but appears to be very temperature-sensitive. 3. During free dives the haemoglobmn is regularly de-oxygenated; the oxygen so derived probably helps to maintain the bug in neutral buoyancy for much of each dive. 4. Carbon monoxide has been used to inactivate the haemoglobin, after which dives are reduced to about one-fifth of their normal duration and the phase of neutral buoyancy is abolished. 5. Much of the oxygen which leaves the pigment probably diffuses into the ventral airstore and then re-enters the tracheal system via the thoracic spiracles. External ‘pumping’ movements may serve to speed this gas migration. It is argued that physical gill action plays a negligible part in the normal respiration of this species.

Physical Gill

2008 ◽  
pp. 2869-2869
Author(s):  
J. Howard Frank ◽  
J. Howard Frank ◽  
Michael C. Thomas ◽  
Allan A. Yousten ◽  
F. William Howard ◽  
...  
Keyword(s):  
Physical Gill

On the spiracles of the larvae of the suborder Myxophaga (Coleoptera)

1967 ◽  
Vol 15 (5) ◽  
pp. 955 ◽  
Author(s):  
HE Hinton
Keyword(s):  
Respiratory Systems ◽  
Larval Insect ◽  
Egg Stages ◽  
First Time ◽  
Physical Gill

The structure of the spiracles in larvae of three (Hydroscaphidae, Sphaeriidae, Torridincolidae) of the four known families of the suborder Myxophaga is described. Further evidence that supports the validity of the suborder Myxophaga is provided by the unusual nature of the respiratory systems of the three families. The larvae of all three families have spiracular gills, and they are the only endopterygote larvae so far known with such structures. The type of permanent physical gill known as a plastron is widely distributed among adult, pupal, and egg stages of insects. It is here reported for the first time in a larval insect. The spiracular gills of the Torridincolidae support a typical plastron meshwork, and reasons are given for believing that the larvae of the Hydroscaphidae and Sphaeriidae are also plastron-breathers.

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