Lymnaea cousini Jousseaume, 1887, from Ecuador (Gastropoda: Lymnaeidae)

Paraense, W. Lobato

doi:10.1590/s0074-02761995000500011

Cited by 28 publications

(30 citation statements)

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“…These sizes are smaller than those from the original description of L. cousini by Jousseaume (1887) but the qualitative shell characters agree perfectly with those originally described. The anatomy of the reproductive system of the Venezuelan specimens is similar to that described by Paraense (1995) for topotypic specimens from Ecuador and has reliable characters: (i) a renal tube showing two distinct flexures of the ureter; (ii) a vagina with a bulbous appearance due to local thickening; (iii) a flat spermiduct with a granular surface; (iv) a prostate with the same granular appearance and a fissure formed by the folding of its left margin and (v) a penis sheath a little longer than the preputium (Fig. 5).…”

supporting

confidence: 66%

“…The use of anatomical characters of the reproductive system has proved very useful for the distinction between lymnaeid species in the Neotropical Area (Paraense 1976(Paraense , 1982(Paraense , 1984(Paraense , 1995. These characters are particularly useful in separating the local L. cubensis from the European L. truncatula because conchological studies carried out on several populations of these two species, were unable to distinguish between them due to the large variability within and between populations (Samadi et al 2000).…”

Section: Morphological Identification Of Lymnaeidsmentioning

confidence: 99%

“…Snails preserved in Railliet Henry's fluid were dissected under a stereoscopic microscope and drawings of the reproductive system were made using a camera lucida attachment. Snails were identified according to conchological and anatomical characteristics (Paraense 1976, 1982, 1984, 1995, Brown 1994, Pointier et al 2004, 2007.…”

mentioning

confidence: 99%

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Distribution of Lymnaeidae (Mollusca: Pulmonata), intermediate snail hosts of Fasciola hepatica in Venezuela

Pointier

Noya

et al. 2009

Mem. Inst. Oswaldo Cruz

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An extensive malacological survey was carried out between [2005][2006][2007][2008][2009] Fascioliasis is a parasitosis mainly infecting cattle, but it is now considered to be an emergent disease in humans in many countries over the world (Mas-Coma 2005). In the New World, it is considered as a serious health problem in several Andean countries. Bolivia is even described as a hyperendemic area and one of its epidemiological characteristics is its very high altitude at more than 4,000 m . The timing of the emergence of human foci in the Altiplano Region corresponds to the invasion by the European intermediate snail host Lymnaea truncatula (Jabbour-Zahab et al. 1997, Meunier et al. 2001. In Venezuela, human fascioliasis was first reported in 1910 and only eight sporadic cases were detected in the following decades (Risquez 1929, Rodríguez & González 1975, Abdul-Hadi et al. 1996, Scorza et al. 1999, Incani et al. 2002, Alarcón de Noya et al. 2006). However, in 2005 five children belonging to the same family were detected with fascioliasis in Timotes, in the Venezuelan Andes, at an altitude of 2,230 m (Alarcón de Noya et al. 2007). The same year a malacological survey carried out in the Timotes area found only a single lymnaeid species, the European L. truncatula. In this paper we present the results of an extensive malacological survey which was carried out A malacological survey was carried out between 2005-2009 across the whole country. A total of 298 sites were sampled (see the inserts in the maps showing all the sampling sites). Snails were sampled from different vegetation either by hand or sampled using a scoop mounted with a wooden handle, depending on the type of site. These sites include the following main habitat types: springs, ditches, brooks, canals, rivers, swamps, tanks, ponds and lakes. Following field collection lymnaeid snails were allowed to relax overnight using menthol. They were then immersed for 40 s in water at 70°C, from which they were transferred to water at RT. The soft parts were drawn from the shell with small forceps and fixed in slightly modified Railliet-Henry fluid (distilled water 930 mL, sodium chloride 6 g, formalin 50 mL, glacial acetic acid 20 mL). Shells were measured to the nearest 1 mm using callipers. Snails preserved in Railliet Henry's fluid were dissected under a stereoscopic microscope and drawings of the reproductive system were made using a camera lucida attachment. Snails were identified according to conchological and anatomical characteristics

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supporting

confidence: 66%

Section: Morphological Identification Of Lymnaeidsmentioning

confidence: 99%

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Distribution of Lymnaeidae (Mollusca: Pulmonata), intermediate snail hosts of Fasciola hepatica in Venezuela

Pointier

Noya

et al. 2009

Mem. Inst. Oswaldo Cruz

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“…bogotensis Pilsbry, 1935;see Hubendick 1951 andPointier et al 2004). L. cousini has been found in Ecuador (Jousseaume 1887, Paraense 1995, Colombia (Piaget 1912, Pilsbry 1935, and Venezuela (Pointier at al. 2004), but no report concerning natural infection has ever been published.…”

mentioning

confidence: 97%

“…Upon arrival at the laboratory, ten specimens were relaxed, killed, and preserved according to Paraense (1984), and their taxonomic identification was performed by Dr Paraense on the basis of features of the shell and internal organs (Paraense 1995). The remaining snails shared the same external appearance as those already determined.…”

mentioning

confidence: 99%