NO. 14 manter: digenetic trematodes of fishes 409 



species T. laticollis and associates the genus along with Proctoeces 

 Odhner with the family Fellodistomidae (= Steringophoridae Odhner). 

 Tergestia can probably be considered in the subfamily Haplocladinae. Its 

 fellodistomid relationship can be clearly seen in the terminal male organs. 



The genus Theledera Linton, 1910, established for Distomum pecti- 

 natum Linton, 1905, is an evident synonym of Tergestia. The genus Ci- 

 thara, named by MacCallum in 1917 with C. priacanthi as type, is like- 

 wise an evident synonj^m of Tergestia. 



Five species of Tergestia have been named: T. laticollis (Rud.) ; T. 

 acanthocephala (Stoss.) ; T. pectinata (Linton) n. comb.; T. priacanthi 

 (MacCallum) n. comb.; and T. acanthoffobii Yamaguti, 1938. T. pecti- 

 nata and T. priacanthi are poorly described, being based on poor material. 

 T. priacanthi in particular, since egg measurements are not given, cannot 

 be identified as to species from its description. 



Linton's (1905, p. 389) Distomuju pectinatum from Bairdiella chry- 

 siira and Trachinotus carolinus at Beaufort, North Carolina, was re- 

 ported by Linton (1910) from Auxis thazard at Tortugas, Florida, and 

 renamed Theledera pectinata (Linton). For the Tortugas material, 

 Linton gives but a few measurements, which differ from the Beaufort 

 description in that the suckers are almost equal in size (0.14 and 0.18) 

 whereas in the specimens from Beaufort the acetabulum was over twice 

 the diameter of the oral sucker (oral sucker 0.10, acetabulum 0.25). I 

 have collected specimens from Bairdiella chrysura at Beaufort and can 

 confirm the sucker ratio stated by Linton. Furthermore, there occur at 

 least 2 species of Tergestia at Tortugas, one of which [collected by the 

 writer from Trachurops crumenophthabnus (Bloch) and Priacanthus 

 arenatus Cuv. and Val.] has a sucker ratio of approximately 1 :2 or a 

 little over 2 and probably corresponds to the original D. pectinatum from 

 Beaufort; the other [collected from Gymnosarda pela?nis (Linn.) and 

 G. alletterata (Raf.)] possesses subequal suckers with the acetabulum 

 usually very slightly larger than the oral sucker. This latter form is 

 probably the Theledera pectinata of Linton, 1910. 



The Pacific material agrees veiy well with that form from the Atlan- 

 tic possessing subequal suckers. In 2 of 5 specimens the ratio was about 

 3 :4, but in the other 3 the acetabulum was only very slightly larger than 

 the oral sucker. This material is to be compared with T. laticollis. There 

 is agreement in shape of pharynx, in distribution of vitellaria, in sucker 

 ratio, and fair agreement in egg size. My Pacific material has eggs 22 to 

 26 by 12 to 17 /x; my Atlantic material has eggs 25 to 29 by 17 to 20 /i; 



