TENTACULARIID TRYPANORHYNCHS FROM THE NHM 



145 



24 



23 



Fig. 23 H. elongata from L. savala. Heteromorphous basal armature, external surface. Scale bar=10 um. 



Fig. 24 H. elongata from L. savala. Heteromorphous basal armature, bothridial surface, external face on left hand side. Scale bar=10 um. 



Fig. 25 H. elongata from L. savala. Heteromorphous metabasal armature, external surface. Scale bar=10 um. 



1996.8.19.1-3, D.T.J. Littlewood leg., Aug. 1995, 1 postlarva from 

 the stomach of a kingfish, Port Royal, Kingston, Jamaica. 



Description. The scolex of a specimen from C. limbatus is 

 shown in Fig. 26. Measurements: SL=1210, 1 134, 1000; SW=700, 

 nm, 493; pbo=700, 642; 500; pv=510, 473, 500; pb=448, 330; 307; 

 ppb=95, 75, 27; vel=170, 232, 160; BL=442 (428-448), 326 (312- 

 331),287(280-294);BW=128(126-130),104(84-107),81 (75-92); 

 BR=3.5:1, 3.2:1; 3.5:1; SP=1.6:1. 1:1, 1.9:1.4:1, 1.6:1.6:1. The ten- 

 tacles are long and slender, with TW=27-30; 23-28, 20-22; TSW 

 increases in size towards the base of the tentacles (24-27, 22-28, 

 29-32), a basal tentacular swelling is absent. Prebulbar organs are 

 absent and muscular rings around the basal part of the tentacle 

 sheaths are present in specimens from Carcharhinus spp. The 

 retractor muscles originate at the base of the bulbs. 



The tentacular armature is homeoacanthous, heteromorphous, 

 and a characteristic basal armature is absent (Figs 27-28). The 

 hooks diminish in size towards the basal part of the tentacle, the 

 hooks are rose-thorn shaped on both sides of the tentacles. The 

 single hook sizes of the three specimens in the metabasal armature 

 were L=9.2-11.2, B=9.2-11.2; L= 10.4-1 2, B=10.4-12; L=9.2- 

 10.5, B=9.3-10.5 (mean L bothridial=10.4) and L=7.2-9.6, 

 B=7.2-9.6; L=9.6-10.4, B=10.4-12; L=7.4-8, B=7.4-8 (mean L 

 antibothridial=8.7), and in the basal part of the tentacle L=7.2-9.2, 

 B=7.2-9.2; L=7.2-8.8, B=7.2-8.8; L=7.2-8, B=7.2-8 (bothridial) 

 and L=5.6-7.2, B=5.6-7.2; L=5.6-7.2, B=4.8-5.6; L=5-6, B=5-6, 

 (antibothridial); hsr=6-7. 



The slightly stained strobila of the specimen from Carcharhinus 

 limbatus consists of about 190 acraspedote proglottids. Proglottids 

 wider than long and increasing in size (about 50 th proglottid: 55-60 

 x 475-185; 100 th : 185-210 x 560-585; 150 th : 360-420 x 755-780; 

 190 th : 670-730 x 840-900). 80-90 testes in a single layer, 33-55 

 (between 100 th and 150 th segments) and 50-65 (final segments) in 

 diameter. Genital pores ventro-lateral, in the anterior half near the 

 middle of the proglottids, alternate irregularly; cirrus sac elongate, 

 directed anteromedially, reaching the anterior end of the proglottids; 

 increasing in size, from 50-60 x 290-350 until 85-90 x 345-365 in 

 last segments. Other internal structures not seen. The acraspedote 

 proglottids of the specimen from Carcharhinus leucas vary in size, 



Fig. 26 Heteronybelinia estigmena. Scolex from Carcharhinus limbatus. 

 Scale bar=100 um. 



