Parasites of skates (Rajidae and Rhinobatidae), of sharks 

 (Carcharhinidae, Pristiophoridae, Squatinidae, Sphyrnidae) and as a 

 natural exception the chimaera (Chimaeridae). 



Type genus, Calicotyle Die sing, 1850 



Dictyocotyle Nybelin, 1941 also belongs to this subfamily. 



During the study of the representatives of the genus Calicotyle, 

 we succeeded in clarifying two peculiarities in their structClre 

 until the present time. Thus, although their edge hooks were suspected, 

 nevertheless, no one had observed them, and consequently no one had 

 attempted to establish their number. During the special study of C. kroyeri 

 Diesing (type species) by us it became clear that this species has 14 edge 

 hooks located as is shown in Fig. 274, C, just as among the remaining 

 Monocotylidae. Thus, one can consider that this question no longer re- 

 quires further discussion. Furthermore, in spite of the fact that none of 

 the researchers discovered any eyes among Calicotyle, which found re- 

 flection even in the diagnoses of the subfamily in the references of Price 

 (Price, 1938a) and Sproston (Sproston, 1946), they actually do have eyes 



Fig. 277. Calicotyle kroyeri Diesing, anterior end of the body (eyes!) of 

 an adult worm from the skin near the anal opening from Raja batis from 

 the region near western England (Atlantic Ocean). 



although of somewhat unusual type (see Fig. 277). The fact that we do not 

 deal with an ordinary occurrence is substantiated by the circumstance that 

 our material on Calicotyle was collected from different regions and from 

 different species of skates. The presence of eyes in the only species of 

 DictylGcotyle--D. coeliaca Nybelin, is not clear. This very aberrant 

 species parasitizes the body cavity of skates, in connection with which 

 the structure of its attaching disc changed secondarily as was indicated 

 in the diagnosis of the subfamily. There is no doubt of its origin from a 

 typical Calicotyle (Nybelin, 1941). 



p. 370 



440 



