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Dilip Kumar Jha
Professor
Agriculture and Forestry University, Rampur, Chitwan
dkjha@afu.edu.np
Bucephalosis
 Bucephalus damriyasai
Phylum: Platyhelminthes
Class: Trematoda
Subclass: Digenea
Order: Plagiorchiida
Family: Bucephalidae
Genus: Bucephalus
Species: Bucephalus damriyasai; B. allahabadensis
 The genus Bucephalus Baer, 1826 includes many species
reported from fresh and marine waters. It is characterised
by having a sucker-like rhynchus with a hood bearing
tentacles (usually seven).
Figs. 1–2 Bucephalus damriyasai n. sp. 1, Holotype, ventral
view; 2, Rhynchus with the seven tentacles labelled for clarity.
Scalebars: 1, 200 lm; 2, 100 lm
Morphology
 Body elongate, narrow, gradually widening to maximum at
about level of gonads;
 bearing 7 tentacles, each with side branches and elongate
central branch; most often withdrawn and difficult to see
 Mouth at level of ovary, well inside posterior half of body,
Pharynx globular
 Testes 2, oval
 Cirrus-sac elongate, more or less parallel sided, reaching to
posterior or anterior testis
 Seminal vesicle subglobular to oval, in proximal cirrus-sac
 Ejaculatory duct narrow, opens on large, lobed genital lobe,
inside genital atrium. Genital atrium large. Genital pore
ventral, distinctly separated from posterior extremity
 Ovary oval
 Excretory pore terminal; anterior extent of vesicle visible in
some specimens reaching just anterior to vitellarium.
Life cycle
Schematic representation of Bucephalus minimus life cycle with parasite life
stages and respective intermediate hosts: a miracidium; b sporocysts
(developed in the first intermediate host —cockles (Cerastoderma edule),); c
free-swimming
Life cycle
Life cycle
Bucephalid cercaria larva
Thanks
for
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Bucephalosis.pdf

  • 1. Dilip Kumar Jha Professor Agriculture and Forestry University, Rampur, Chitwan dkjha@afu.edu.np
  • 2. Bucephalosis  Bucephalus damriyasai Phylum: Platyhelminthes Class: Trematoda Subclass: Digenea Order: Plagiorchiida Family: Bucephalidae Genus: Bucephalus Species: Bucephalus damriyasai; B. allahabadensis  The genus Bucephalus Baer, 1826 includes many species reported from fresh and marine waters. It is characterised by having a sucker-like rhynchus with a hood bearing tentacles (usually seven).
  • 3. Figs. 1–2 Bucephalus damriyasai n. sp. 1, Holotype, ventral view; 2, Rhynchus with the seven tentacles labelled for clarity. Scalebars: 1, 200 lm; 2, 100 lm
  • 4. Morphology  Body elongate, narrow, gradually widening to maximum at about level of gonads;  bearing 7 tentacles, each with side branches and elongate central branch; most often withdrawn and difficult to see  Mouth at level of ovary, well inside posterior half of body, Pharynx globular  Testes 2, oval  Cirrus-sac elongate, more or less parallel sided, reaching to posterior or anterior testis  Seminal vesicle subglobular to oval, in proximal cirrus-sac
  • 5.  Ejaculatory duct narrow, opens on large, lobed genital lobe, inside genital atrium. Genital atrium large. Genital pore ventral, distinctly separated from posterior extremity  Ovary oval  Excretory pore terminal; anterior extent of vesicle visible in some specimens reaching just anterior to vitellarium.
  • 6. Life cycle Schematic representation of Bucephalus minimus life cycle with parasite life stages and respective intermediate hosts: a miracidium; b sporocysts (developed in the first intermediate host —cockles (Cerastoderma edule),); c free-swimming
  • 7.