Physa


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Physa

(fī'să),
Type genus of the freshwater pulmonate snails (family Physidae), which includes several common American species such as Physa parkeri, Physa gyrina, and Physa integra; they are intermediate hosts of a number of bird and animal trematodes, including several that cause schistosome dermatitis in humans.
[G. a pair of bellows; an air bubble; bladder]
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
Predator-prey interactions between crayfish Orconectes juvenilis and snails Physa gyrina are affected by spatial scale and chemical cues.
Population biology of the invasive freshwater snail Physa acuta approached throught genetic markers, ecological characterization and demography.
Hemoglobin concentration showed alteration; increased to 2.6 g in Planorbis collected from Kobry El-Lansh and decreased to 0.8 g in Physa collected from Annanya, Damietta.
Physa acuta (Drapanaud)###7.3###8###6.3###9###5.4###3.8###6.63###1.87
August Cluster 1 (AC1)--Amphipoda-dominated Wetlands.--AC1 (n = 5 wetlands) was characterized by high densities of Amphipoda (Hyallela [indicator for the cluster, P = 0.022] and Gammarus), Hirudinae (Erpobdella, Nephelopsis and Mooreobdella), Ephemeroptera (Caenis and Cloeon), Gastropoda (Physa, Promenetus, and Gyraulus), Coleoptera (Brychius, and Ilybius), and Enallagma; but lacked Agabus and Chaoborus.
revolutum infection in humans are freshwater clams (Corbicula producta) in Taiwan and snails (Physa occidentalis or Lymnaea sp.) in Thailand (1,5).
The Rainbow Mussel, Lake Erie Watersnake, and the Lake Winnipeg Physa Snail are all endangered.
(Amphipoda) y Physa venustula (Gastropoda); Sphaerium sp.
Antagonistic pleiotropy is found not only in humans, but in widely differing species such as hermaphroditic snails Physa acuta (69), platyfish Xiphophorus maculatus (70), song sparrows Melospiza melodia (71), wild red deer Cervus elaphus (72) and the common guillemot seabirds Uria aalge (73).
Hyalellidae Hyalella curvispina Mollusca Ancylidae Gundlachia gayana Amnicolidae Littoridina cumingi Physidae Physa chilensis Platyhelminthes Dugessidae Indeterminado Annelida Glossiphoniidae Indeterminado Tubificidae Tubifex sp.