NEIHPID

Eurytrema pancreaticum (Looss Looss) Janson 1889 Back

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Taxonomy

Platyhelminthes »
       TREMATODA »
              Digenea »
                     Dicrocoeliidae (Looss, 1899) Odhner, 1910 »
                            Dicrocoeliinae Looss, 1899 »
                                   Eurytrema Looss, 1901 »
                                           Eurytrema pancreaticum (Janson 1889), Looss 1907

Host

Bos (indicus), Bubalus (bubalis), Capra (hircus), Ovis (aries)

Habitat

Bile duct

Locality

Tura (Meghalaya), Nongstoin (Meghalaya), Jowai (Meghalaya), Shillong (Meghalaya), Silchar (Assam), Guwahati (Assam), Agartala (Tripura)

Description

Body elongated, flattened, with ruffled margins and conical caudal appendage; 8.58-12.65 mm in length, 5.87-8.94 mm in width; ratio of body width to body length 1:1.30-1:1.65. Oral sucker sub-terminal, larger than ventral sucker, 1.17-1.71 mm in diameter, ratio to body length 1:7.24-1:8.42. Pharynx 0.22-0.45 mm in length, 0.31-0.45 mm in width. Oesophagus 0.13-0.36 mm long .Caeca narrow, reaching to posterior part of body. Ventral sucker 0.94-1.35 mm in diameter, ratio to body length 1:7.48-1:9.66. Testes irregular in shape, postero-lateral to ventral sucker; left testis 0.63-1.26 mm in length, 0.58-1.03 mm in width, right testis 0.45-0.94 mm in length, 0.54-1.03 mm in width. Cirrus sac elongated. Ovary sub-terminal, 0.22-0.58 mm by 0.45-0.76 mm. Vitellaria small finger-like follicles in lateral fields. Eggs 0.027-0.045 mm by 0.022-0.036 mm. Genital pore post-bifurcal, 1.89-2.80 mm from anterior end.

Remarks

Bhalerao,(1924) described Eurytrema dajii, from cattle and buffaloes in Burma. However, Chatterji,(1938) regarded E. dajii as synonymous with E. pancreaticum.
E. pancreaticum is a common digenean parasite of ruminant hosts in Asia (Yamaguti, 1971; Takaoka et. al., 1983) and is the only species of the genus represented in India. The interesting feature noted in the present study was that one adult specimen exhibited a monorchic condition, while showing similarity with regard to all other morphological features.

Helminthological collections record

NEHU/Z - TM/28

Specimen Type

Holotype: W778/1 in Zoological Survey of India, Kolkata.

References

Bhalerao, G. D. (1924) A contribution to the knowledge of trematode parasites of food mammals of Rangoon. Annals of Tropical Medicine and Parasitology. 18:pp 139-156

Chatterji, R .C.(1938) Annotated list of the helminths recorded from domesticated animals of Burma. Part I. Trematoda. Proceedings of National Academy of Science, India. 8:pp 93-104.

Yamaguti, S. (1971). Synopsis of digenetic trematodes of vertebrates. Vol.1. Tokyo (Keigaku Publishing Co.).

Takaoka, H ., Mochizuki, Y., Hirao, E., Iyota, N., Matsunaga, K .and Fujioka, T. (1983). A Human case of Eurytremiasis: Demonstration of adult pancreatic fluke Eurytrema pancreaticum (Jason, 1889) in Resected Pancreas. Japanese Journal of Parasitology. 32:pp 501-508.