A survey of the presence of digenetic trematode larvae in freshwater snails collected in Bakas, Norzagaray, Bulacan

Date of Publication

1997

Document Type

Bachelor's Thesis

Degree Name

Bachelor of Science in Biology

College

College of Science

Department/Unit

Biology

Abstract/Summary

Snail samples were obtained from a part of Angat River in Bakas, Norzagaray, Bulacan from June to November of 1996. The freshwater snails identified were namely: Melanoides tuberculata, with the small, smooth variant (=SSV), and large, spiny variant (=LSV), Melanoides granifera, and Ampullaria sp. Each individual snail was weighed, sex was determined, and was examined for the presence of trematode larval infection. Melanoides tuberculata (=LSV), recorded 9 infected snails, having an overall prevalence of 18% with 16.67%, and 25% prevalence for female, and male, respectively. Two cercarial body type were noted in this species the opthalmo-elongate bodied cercariea, with knob-like tails, and eyespots, and the xiphidiocercarial type with ovoidal bodies, with a stylet. The small, smooth variant of M. tuberculata had 11 positive cases, all in female snails, and accounts for 22% overall prevalence. Only one cercarial body type was noted, with spherical to somewhat ovoidal bodies, but without stylet Melanoides granifera had 19 positive for larval infection, with 40.48%, and 25% prevalence of for females, and males, respectively, and overall prevalence of 38%.

Abstract Format

html

Language

English

Format

Print

Accession Number

TU07622

Shelf Location

Archives, The Learning Commons, 12F, Henry Sy Sr. Hall

Physical Description

52 leaves

Keywords

Snails; Trematoda; Digenea--Larvae

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