138 



H.W. PALM 



Fig. 6 Nybelinia lingualis from Torquigener pleurogramma. Scolex. 

 Scale bar=100 |im. 



Fig. 7 iV. lingualis from T. pleurogramma. Homeomorphous basal 

 armature consisting of rounded hooks without anterior extension of the 

 basal plate. Scale bar=10 um. 



identified as belonging to Nybelinia riseri on basis of the character- 

 istic scolex form. It has to be kept in mind that the tentacles of the 

 present specimens were not completely evaginated. The present 

 finding represents a new host and locality record. 



6. Nybelinia sakanariae sp. nov. 



(Figs 12-13) 



Material examined. Holotype and paratype, BMNH 1 976. 1 .7.9, 

 Hecht leg., 2 postlarvae from the stomach of Xiphiurus capensis, 

 South Africa. Additional material: BMNH 1976.1.7.7-8, Hecht 

 leg., 1 postlarva from the testes of Trachurus trachurus, Algoa Bay, 

 South Africa. 



Description (Fig. 12). Measurements: SL=15 12, 1507; SW=775, 

 747; pbo=700, 700; pv=680, 647; pb=397, 386; ppb=94, 100; 

 vel=360,335;app=360,335;BL=387,335;BW=116,113;BR=3.3:l, 

 3:1; SP=1. 8:1.7:1, 1.8:1.7:1. A basal tentacle swelling is absent. 

 TW=51-56. The tentacle sheaths are short, little coiled with a 

 TSW=5 1-56. Prebulbar organs and muscular rings around the basal 

 part of the tentacle sheaths are absent. The retractor muscles origi- 

 nate in the basal part of the bulbs. 



The armature is homeoacanthous, homeomorphous, and con- 

 sists of compact rose-thorn-shaped tentacular hooks (Fig. 13); 

 upper basal and metabasal armature, L=16-22; B=13. 5-17.0). 

 Characteristic basal hooks are absent. However, the hooks dimin- 

 ish in size towards the basal part of the tentacles (L= 12-14; 

 B=ll-13);hsr=6-7. 



Additional material. SL=3270; SW=1020; pbo=1134; 

 pv=l 172; pb=605; ppb=567; vel=756; app=740; BL=580; BW=147; 

 BR=3.9:1; SP=2:2:1. The tentacles are short and a basal tentacle 

 swelling is absent. TW=56-61. The tentacle sheaths are straight, 

 prebulbar organs and muscular rings around the basal part of the 

 tentacle sheaths are absent. The retractor muscles originate in the 

 basal part of the bulbs. Metabasal armature, L=21-23; B=15-17. A 

 characteristic basal armature is absent, the hooks diminish in size 

 towards the basal part of the tentacles (L=ll-13; B=ll— 13); hsr=7. 



Remarks. The present specimens correspond with Nybelinia 

 strongyla in having a similar scolex, SP, BR, TW and a similar hook 

 size. However, the scolex size is smaller than indicated by Dollfus 

 ( 1 960) and the type material deposited at the MNHN Paris revealed 

 a different hook shape. The material also resembles N. riseri as 

 described by Dollfus (1960) with corresponding values of SL, BL, 

 BW, BR, ppb and a similar basal hook size. The hook form of N. 

 riseri appears massive with a broad base, and hooks are tightly 

 packed along the tentacle. However, the hooks of the armature of N. 

 riseri of about 11-12 um are distinctly smaller than in the present 

 specimens, and the characteristic scolex form of N. riseri (see 

 above) was not present. The specimens also have some similarities 

 with Nybelinia queenslandensis Jones & Beveridge, 1998 with a 

 similar hook form. However, the specimens clearly differ in having 

 the hooks more tightly spaced and different values for SL, TW, BR 

 and SP. Thus, the present specimens represent a new species, 

 Nybelinia sakanariae sp. nov. Interestingly, the additional material 

 obtained from another host had a much larger scolex than observed 



