Fig 5 - uploaded by Anbalagan Sankarappan
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Ferrissia fivefallsiensis sp. nov. Shell (a-c): (a) Dorsal view; (b) Ventral view; (c) Lateral view; (d) Copulative apparatus (ps-Penis sheath; pp-Praeputium; vd-Vas deferens).
Source publication
Background & objectives: Vector ecology and taxonomy of snails is a prerequisite for controlling schistosomiasis in the tropics. The ecology of the freshwater limpet genus Ferrissia was investigated for detection of cercariae larvae in them, and taxonomic description of a new species of the genus Ferrissia.
Methods: This study was conducted in 15 p...
Contexts in source publication
Context 1
... description (Fig. 5a): Shell length 3.2 mm, width 1.8 mm, and aperture height 1.1 mm. Shell small, suboval, thin and fragile, bilaterally asymmetrical, 1.68-1.75 times as long as its greatest width (middle region), its height 0.36 and 0.61 times as long as its length and its greatest width; periostracum colour yellow to brown with dark brown irregular spots ...
Context 2
... 1.8 mm, and aperture height 1.1 mm. Shell small, suboval, thin and fragile, bilaterally asymmetrical, 1.68-1.75 times as long as its greatest width (middle region), its height 0.36 and 0.61 times as long as its length and its greatest width; periostracum colour yellow to brown with dark brown irregular spots as many as in umbilicus region; apex (Fig. 5b) blunt, reflected right, not elevated; 4-5 fine radial ridges visible at dorsal ...
Context 3
... body: Head, foot and mantle of the animal are white without any characteristic pattern of colouration (Fig. ...
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Citations
... Six species of the freshwater limpet genus Pettan cylus Iredale, 1943(reported as Ferrissia Walker, 1903 are currently known from India (Ramakrishna and Dey 2007;Sankarappan et al. 2015). They superficially resemble limpets in morphology, but actually belong to the family Planorbidae (subfamily Ancylinae) (Mollus-caBase 2021). ...
... Pettancylus tenuis (Bourguignat, 1862). Pettancylus ver ruca is distributed throughout India, while P. tenuis is restricted to Nilgiris (its type locality) and adjacent hills in southern India along with two reports from a few places in south-western Maharashtra (Subba Rao 1993;Devi and Jauhari 2008;Sankarappan et al. 2015). ...
... Specimens were identified following Subba Rao (1993), Ramakrishna and Dey (2007), and Sankarappan et al. (2015). The latest taxonomical nomenclature was confirmed using MolluscaBase (2021). ...
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The present study was focused to examine diversity and distributional pattern of freshwater snails and to identify the schistosome infected snails in ten different ponds of Madurai district, Tamil Nadu, South India. Snails were collected from native substrates in ponds using dip net from Madurai North, Tamil Nadu province of south India and microscopic examination for detecting cercariae larvae in snails were assessed. In total, 1250 individuals belonging to six species under five families of freshwater snails were collected. The alpha and beta diversity analyses were calculated for estimating the diversity of snails. The cercariae infection was observed in four collected freshwater snail species. Of four infected snails, Lymnaea luteola had the highest percentage of cercariae infection. Statistical tests showed that the environmental factors of total dissolved solids, pH and salinity were significantly related with snail distribution and cercariae infection rather than spatial factor. The study demonstrated that the salinity, conductivity and total dissolved solids of pond water play a key factor for the distribution of snails and cercariae infection. The findings of our study will improve the understanding of the dynamics of schistosomiasis transmission and would ease the implementation of integrated disease control measures based on ecological knowledge of schistosomiasis vector in Madurai and Tamil Nadu zones.
7. Invasive Freshwater Invertebrates and Fishes: Impacts on Human
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Abstract
Inland waters are subject to more widespread biotic invasions than terrestrial ecosystems. During the last century, 756 aquatic species were introduced in Europe, frequently carrying new parasites for native fauna and humans. The consequences of such invasions are the loss
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the effects of the chemicals needed to control these aliens, changes to ecosystem services making the invaded area less suitable for recreational human use and damage to cultivation/ aquaculture affecting human well-being in developing countries. A clear management
response is urgently needed to halt their spread and reduce or minimize the risk of human and wildlife disease.
