TENTACULARIID TRYPANORHYNCHS FROM THE NHM 



3. Nybelinia jayapaulazariahi Reimer, 1980 (Figs 4-5) 



Material examined. BMNH 1980.12.2.1, A. Roy leg., 14.9.79, 

 1 postlarva from Harpodon nehereus, Houghly estuary, India (Figs 

 4-5). 



Description. Measurements: SL=530; SW=326; pbo=298; 

 pv=285; pb=165; app=114; vel=96; BL=157 (150-165); BW=54; 

 BR=2.9:1; SP=1. 8:1.7:1; TW=16-18.5; TSW=12.5-15.5; a basal 

 tentacle swelling is absent; the tentacle sheaths are straight; Prebulbar 

 organs and muscular rings around the basal part of the tentacle 

 sheaths are absent. The retractor muscles originate at the basal part 

 of the bulbs. 



The tentacular armature is homeoacanthous, homeomorphous, 

 and a characteristic basal armature is absent. The size of the slender, 

 regularly curved hooks increases slightly towards the metabasal part 

 of the tentacle; L=9.6-l 1.2; B=5.6-7.2 (metabasal) and L=5.6-7.2; 

 B=5.6-7.2 (basal); hsr=6. 



REMARKS. The present specimen from Harpodon nehereus corre- 

 sponds closely with that of the original description by Reimer 

 (1980) from Cynoglossus sp.. Beside a similar scolex form (Fig. 7 in 

 Reimer, 1980) and similar scolex and bulb ratios (SP 1.9:-: 1 and BR 

 3:1), the hook size is identical and the hook form (as given in 

 Reimer, 1980, Fig. 8) resembles that given in Fig. 5 (see arrow). The 

 hook form with its slender, regularly curved shaft is distinct from the 

 robust rose-thorn shaped hooks of many other Nybelinia species. 

 The values of the TW extracted from Fig. 7 of Reimer are slightly 

 higher (ca. 20-25 urn) than those of the present specimen. Both 

 specimens were found in the same part of the Indian Ocean, Houghly 

 estuary, India, and the Bay of Bengal, India. Harpodon nehereus 

 represents a new host for Nybelinia jayapaulazariahi. 



4. Nybelinia lingualis (Cuvier, 1817) 



(Figs 6-9) 



Material examined. BMNH 1987.3.2.19, R. Bray leg., 1 

 postlarva from the gut of Torquigener pleurogramma, Adelaide, 

 South Australia; BMNH 1987.4.23. 11-1 2, R. Bray leg., 03. 12. 1986, 

 2 postlarvae from the branchial chamber of Arnoglossus imperialis, 

 Cirolana 76-78 m, 49°50'5"N, 3°44'3"W; BMNH 1987.4.23.18-32, 

 R. Bray leg., 03.12.1996, 1 postlarva from the intestinal wall of 

 Pagusa lascaris, Cirolana, English Channel, 49°50'5"N, 3°44'3"W, 

 76-78 m. 



DESCRIPTION. Nybelinia lingualis was described in detail by 

 Dollfus (1942). The scolex of the specimen from T. pleurogramma 

 is shown in Fig. 6. Measurements: SL=1606, 1720, 1700, 2040; 

 SW=718,982,907, 1172;pbo=700, 1096, 1096, 1172; pv=642, 907, 

 907, 1171; pb=397, 321, 298, 341; ppb=75, 0,0, 10; app=490, 510, 

 491, nm; BL=365 (326-397), 313 (303-322), 292 (289-294), 341; 

 BW=138 (130-140), 128(117-140), 114 (112-1 17), nm;BR=2.6:l, 

 2.4:1, 2.6:1, nm; SP=1.8:1.6:1, 3.4:2.8:1, 3.7:3:1, 3.4:3.4:1. The 

 tentacles are long and slender and diminish in diameter towards the 

 tip; TW basal=39, 42, 46, 46, TW metabasal=32, 33, 33, 38; TW 

 distal=24, nm, nm, nm. A basal tentacular swelling is not present. 

 The tentacle sheaths are coiled in 1 to 2 spirals near the bulbs; TSW= 

 36, 46, 42, 40. 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 a charac- 

 teristic basal armature is present (Figs 7-9). The tentacular hook 

 form changes towards the apical part of the tentacle from compact, 

 rounded rose-thorn (Fig. 7), lacking an posterior extension of the 

 basal plate, to more slender rose-thorn shaped hooks (Figs 8-9). The 

 hooks in the basal part of the tentacle are smaller (L=l 1.0-1 3.0, 



137 



11.6-13.6, 11.6-13.6, 11.6-13.6; B=9. 3-11.2, 7.2-9.6, 7.2-9.6, 

 7.2-9.6) than in the metabasal armature (L=14.5-16.7, 16.0-18.4, 

 16.0-18.4, 16.0-18.4; B=9.3-13.0, 12.0-13.5, 12.0-13.5, 12.0- 

 13.5). The number of hooks per half spiral diminish towards the 

 apical part of the tentacle; hsr=6-7 (basal), hsr=5-6 (apical). 



Remarks . The present specimens correspond with those described 

 by Dollfus (1942). Although the scolex measurements as well as 

 hook sizes are smaller than those given by Dollfus ( 1 942), the scolex 

 form as well as the form and arrangement of the tentacular hooks 

 correspond with drawings of A 7 , lingualis found in Sepia fdliouxi, S. 

 officinalis and Mullus barbatus (see Dollfus, 1942, Figs 88-91). 

 According to Dollfus (1942), the bulbs are typically short (about 

 300-400 urn long), with a BR of about 2.2-2.5:1. Additionally, 

 Dollfus (1942) demonstrated a high degree of morphological vari- 

 ability within the species with a scolex size between 1 .2-3.2 mm. As 

 with Tentacularia coryphaenae, Nybelinia lingualis has a wide 

 zoogeographical distribution and a low host specificity. The present 

 findings with the exception of specimens in Pagusa lascaris are new 

 host records and extend the known range of distribution for the 

 species to Australian waters. Palm (1995) examined specimens of 

 the same species (BMNH 1987.4.23.18-32 from P. lascaris) and 

 tentatively identified them as N. lingualis. The present finding 

 confirms this identification. Thus, the surface morphology of 

 Nybelinia lingualis with filiform microtriches on the distal bothridial 

 surface and hook-like microtriches on the bothridial borders corre- 

 sponds to those as described for Tentacularia coryphaenae, N. 

 alloiotica, N. edwinlintoni, N. queenslandensis and N. c.f. 

 senegalensis (Palm, 1995, Jones & Beveridge, 1998). 



5. Nybelinia riseri Dollfus, 1960 



(Figs 10-11) 



Material examined. BMNH 1985.11.8.65, G. Ross leg., 

 30.11.1979, 3 postlarvae from Trachyurus felicipes (Figs 10-11), 

 stomach wall, East Cape, South Africa. 



Description. Measurements: SL=1455 (1380-1587); SW 

 (pbo)=580 (510-680); SW (pv)=400 (300-454); pbo=630 (585- 

 662); pv=636 (567-700); pb=294 (280-303); ppb=204 (151-233); 

 app=331 (312-360); BL=284 (270-303); BW=100 (84-117); 

 BR=2.8:1 (2.7:1-3.2:1); SP=2. 1:2.2:1. The tentacles are not com- 

 pletely evaginated, a basal tentacle swelling is absent. TW=51-56. 

 The tentacle sheaths are straight and the TSW without invaginated 

 tentacles is nearly half as small (TSW=23-28) than with invaginated 

 tentacles (TS W=42^16). 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. 



The tentacular armature is homeoacanthous, homeomorphous, 

 and consists of compact rose-thorn-shaped tentacular hooks (upper 

 basal armature, L=14-19; B=12— 15). The hooks are in tight spirals 

 (Fig. 1 1 ) and the hooks diminish in size towards the basal part of the 

 tentacles (L=12-14; B=9-12); hsr=6-7. 



Remarks. Only two species, N. riseri and N. lingualis, have been 

 described as having a similar champion-shaped scolex form as well 

 as a homeoacanthous, homeomorphous tentacular armature such as 

 described for the present specimens. N. riseri is characterised by the 

 champion-shaped scolex (see Dollfus, 1960), however, the hooks in 

 the basal part of the tentacle (L= 11-12, B=l 1-12) are smaller than 

 observed for the present specimens. N. lingualis corresponds with a 

 similar basal armature (see above) and scolex proportions as de- 

 scribed for specimens ofN. lingualis taken from Trachyurus felicipes 

 (see Dollfus, 1942). However, the general scolex form with the 

 small banana-shaped bulbs of Nybelinia lingualis (see Dollfus, 

 1942) clearly differs to the present specimens. Thus, they are 



