OOCYTE DEGENERATION AND ALTERED OVIPOSITORY ACTIVITY INDUCED BY PARAQUAT IN THE FRESHWATER SNAIL PHYSA FONTINALIS (GASTROPODA: PULMONATA)
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چکیده
منابع مشابه
Monoamines in the pedal plexus of the land snail Megalobulimus oblongus (Gastropoda, Pulmonata).
In molluscs, the number of peripheral neurons far exceeds those found in the central nervous system. Although previous studies on the morphology of the peripheral nervous system exist, details of its organization remain unknown. Moreover, the foot of the terrestrial species has been studied less than that of the aquatic species. As this knowledge is essential for our experimental model, the pul...
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The only known population of the Aldabra banded snail Rhachistia aldabrae declined through the late twentieth century, leading to its extinction in the late 1990s. This occurred within a stable habitat and its extinction is attributable to decreasing rainfall on Aldabra atoll, associated with regional changes in rainfall patterns in the late twentieth and early twenty-first century. It is propo...
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Morphological changes in the sexual organs of the pulmonates were observed throughout a year and correlated with reproductive-cycle periods. Reproductive-organ weights of the snail Megalobulimus abbreviatus were recorded seasonally and gonad sections were analyzed morphologically. The weights were used to obtain the organosomatic index. Mean oocytic diameter and oocytic maturation index were ba...
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Vertigo botanicorum sp. nov. is described from the Russian Altai Mountains. The species was recorded in 8 out of 118 study sites and totally 21 live individuals and 15 empty shells were collected. It is a medium-sized Vertigo species living in various tall-forb meadows, shrubby and forest habitats; avoiding only dry and strictly open sites. Mostly it was found in rather acidic sites of higher a...
متن کاملVascular supply of the central nervous system of the land snail Megalobulimus oblongus (Gastropoda, Pulmonata).
The vascularization of the central nervous system of the snail Megalobulimus oblongus was studied by injection of carmine-gelatin solution into the arterial system and using a histochemical technique for the detection of alkaline phosphatase. The central nervous system of M. oblongus is irrigated by the anterior aorta, from which a series of small branches emerge that supply the subesophageal n...
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ژورنال
عنوان ژورنال: Journal of Molluscan Studies
سال: 2002
ISSN: 1464-3766,0260-1230
DOI: 10.1093/mollus/68.2.181