Necator americanus Archives - Online Biology Notes A Complete notes for Students Thu, 21 May 2020 06:02:06 +0000 en-US hourly 1 Difference between Ancyclostoma duodenale and Necator americanus https://www.onlinebiologynotes.com/difference-between-ancyclostoma-duodenale-and-necator-americanus/ Thu, 21 May 2020 06:02:02 +0000 https://www.onlinebiologynotes.com/?p=2613 Ancyclostoma duodenale VS Necator americanus S.N Characteristics of adult worm Ancylostoma Duodenales Necator americanus 1 Pathogenicity More pathogenic Less pathogenic 2 size Larger and thick [...]

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]]> Ancyclostoma duodenale VS Necator americanus

S.NCharacteristics of adult wormAncylostoma DuodenalesNecator americanus
1PathogenicityMore pathogenicLess pathogenic
2sizeLarger and thickSmall and slender Male- 5-6 mm Female – 1 cm
3ShapeSingle curve looks like ‘C’Double curve looks like ‘S’
4Buccal capsuleLarger and oval. 6 teeth, 4 hook like teeth on ventral surface. 2 knob-like teeth on dorsal surfaceSmall and round. 4 chitinous plates- 2 on ventral surface and 2 on dorsal surface.
5Anterior endBends in the same direction as body curvatureBends in the opposite direction to the body curvature
6Posterior end of femaleA spine is presentNo spine
7Copulating bursaCircle in shape. Dorsal ray is single, bifurcated at the tip, bifurcation is tripartite. Total number of rays is 13.Oval in shape. Dorsal ray is split from base. Each bifurcation is bipartite. Total no of rays 14.
8Copulatory spiculePresentabsent
9Vulva positionBehind the middle of the bodyIn front the middle of the body
S.N.Characteristics of filariform larvaeAncylostoma duodenaleNecator americanus
1Transverse cuticular striationsLess prominentMore prominent
2Shape of headSlightly conicalRounded
3Buccal cavity-Shorter, 10-15 mm long -Lumen larger – chitinous wall thin Bounded by one line dorsally and two less prominent lines ventrally covered anteriorly -a fine line joins the oral depression and anterior end of buccal structureLarger, 15-26 mm long -lumen shorter -chitinous wall thick -dorsal and ventral walls are of equal thickness, diverse anteriorly -no visible line between the oral depression and anterior end of buccal structure
4Oesophago-intestinal junction-no gap between the esophagus and intestine -anterior dilation of intestinal lumen less prominent-An apparent gap between the esophagus and intestine -anterior dilation of intestinal lumen more prominent
5Posterior end of intestineA small refractile body is presentNo refractile body
6Position of genital rudimentBehind the point midway between the end of esophagus and the anus.In front of the point midway between the end of esophagus and anus.
Difference between Ancyclostoma duodenale and Necator americanus

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