Trematodes and Cestodes 5 g-h 



Class I TREMATODA 



Order I Hbterocotylea Monticelli 1892 



Family TRISTOMIDAE Cobbold 1877 



Subfamily TRISTOMINAE Monticelli 1892 



Genus Epibdella Blainville 1828 



Epibdella hippoglossi (0. F. Mijller 1776) 



(Figs. 1 and 2.) 



1776 : Hirudo hippoglossi 0. F. Mullbe 1776 : 220 



(Type host, Hippoglossus; Denmark) 



1780: Hirudo hippoglossi Fabricitjs 1780: 320 



1788: Hirudo hippoglossi 0. F. Mullbr 1788: 18 



1790: Hirudo hippoglossi Gmelust 1790: 3098 



1815: Phylline hippoglossi Okbn 1815 



1828 : Epibdella hippoglossi Blainville 1828 : 567 



1843: Tristonia hamatum Rathke 1843: 238 



?1850: Phylline hippoglossi Diesing 1850: 426 



1858: Epibdella hippoglossii Beneden" 1858: 21 



1864: Epibdella hippoglossi Beneden and Hesse. 1864: 69 



1878: Nitzschia hippoglossi Taschenberg 1878: 568 



1890: Epibdella hippoglossi Bratjn 1890: 411, 527, etc. 



1891: Epibdella hippoglossi Monticelli 1891: 105, 125, etc. 



1896: Epibdella hippoglossi Schott 1896: 253 



1899 : Phyllonella hippoglossi Goto 1899 : 264 



1902: Epibdella hippoglossi Monticelli 1902: 137, etc. 



1904: Epibdella hippoglossi Stafford 1904: 482 



1905: Epibdella hippoglossi Odhner 1905: 370 



Specific diagnosis. — With the characters of the genus. Medium large 

 trematodes with elongated, ovoid body having a length and a breadth (exclusive 

 of the posterior organ of adhesion) of 12 to 24 and 8 to 11 mm., respectively. 

 Slightly constricted behind the anterior organs of adhesion. Latter elongated, 

 not excavated and only slightly separated from the body, 1-85 mm. in length by 

 1-0 in width. Posterior sucker orbicular, 4 to 5-5 mm. in diameter; somewhat 

 thickened anteriorly; inner (ventral) surface provided with small tubercles, 

 radiating posteriorly; anterior hooks almost straight, considerably protruding, 

 0-56 to 0-77 mm. in length, middle, much curved, 0-86 to 1-40, posterior, with 

 minute hook at tip, 0-99 mm. 



Mouth median^ ventral and opposite the constriction ("neck"), provided with 

 indistinct lips. Pharynpc pentagonal in shape, 0-65 to 0-88 mm. in diameter. 

 Oesophagus surrounded by salivary glands, 0- 16 to 0- 18 mm. in length. Intest- 

 inal coeca almost parallel to the posterior border of the ovary, from which point 

 they diverge to pass close to the outside of the testes, then converge again to be 

 united by one or more commissures near the anterior border of the ventral sucker. 



Only one pair of polynuclear giant-cells in the angle between the testes 

 posteriorly. 



Outer circular, middle diagonal and inner longitudinal layers of muscles in 

 body; those of sucker very well developed and complicated for the movement 

 of the hooks. 



No minute tentacular projections at the anterior tip of the body. Two 

 pairs of eyes. Two chief nerves on each side of the body, connected by seven 

 transverse commissures; one commissure between the median pair of strands 

 at posterior end of body; main nerves pass anteriorly into the brain, situated 

 above the pharynx and composed of two ganglia curved forward and united by 

 five small nerves. Extensive plexus of nerves in posterior sucker. 



