Nybelinia lingualis (Cuvier, 1817)

Palm, Harry W. & Walter, Thorsten, 2000, Tentaculariid cestodes (Trypanorhyncha) from the Muséum national d’Histoire naturelle, Paris, Zoosystema 22 (4), pp. 641-666 : 646-647

Nybelinia lingualis (Cuvier, 1817)

Tetrarhynchus lingualis Cuvier, 1817 .

Nybelinia punctatissima Dollfus, 1960 . New synonym.

MATERIAL EXAMINED. — 30.III.1957, postlarva from the body cavity of Thunnus thynnus (Linnaeus, 1758) , fish market, Paris ( MNHN 679 HF).

ADDITIONAL MATERIAL.— Vanneau. France, 29.VI.1923, 2 postlarvae from Raja sp. ( MNHN 761- 762 HF) ; 20.VI.1924, 3 postlarvae from the gills of Chelidonichthys lucerna (Linnaeus, 1758) ( MNHN 764-766 HF) .

Cap Cautin. Morocco, 15.IX.1932, leg. V. Bernard, 2 postlarvae from the mesentery of Trigla lyra Linnaeus, 1758 (MNHN 756-757 HF).

Monacco. 08.IV.1938, leg. H. Nouvel, postlarva from Eledone cirrhosa (Lamarck, 1798) (junior synonym Eledone aldrovandii MacGillivray, 1843 ) (MNHN 763 HF).

Agadir. Morocco, 04.VIII.1945, 2 postlarvae from the stomach and the musculature of Trigla bicarinata (unrecognisable binomen) ( MNHN 751-752 HF).

Ajaccio. Corsica, IV.1948, leg. E. Houdemer, 3 postlarvae from between the tunica of the stomach wall of Scomber scombrus Linnaeus, 1758 ( MNHN 693 HF, 758 HF) ; 12.VI.1952, leg. G. Houdemer, 2 postlarvae from the mesentery of Mullus surmuletus Linnaeus, 1758 ( MNHN 759-760 HF) .

Arcachon. Gironde, France, 1949, 3 postlarvae from Chelidonichthys gurnardus (Linnaeus, 1758) ( MNHN 753-755 HF).

Sète. France, 07.I.1950, 23.I.1952, leg. L. Euzet, 3 adults from Hexanchus griseus (Bonaterre, 1788) ( MNHN 687-688 HF) ; 07.X.1953, 30.X.1953, 25.XI.1953, leg. L. Euzet, 3 adults from Dasyatis violacea (Bonaparte, 1832) ( MNHN 689-691 HF) ; 29.IX.1951, leg. L. Euzet, 4 adults from Isurus oxyrhynchus Rafinesque, 1810 ( MNHN 680- 686 HF) .

DESCRIPTION

sl = 2700; sw = 1620; pbo = 1755; pv = 1350; pb = 462; ppb = 238; vel = 672; app = 924; bl = 392 (378-420); bw = 131 (121-138); br = 3.0:1; sp = 3.8:2.9:1; tw metabasal = 38-41. A basal tentacular swelling is absent. The tentacle sheaths are straight; tsw = 31-34. Prebulbar organs are absent, muscular rings around the basal part of the tentacle sheaths are present. The retractor muscles originate in the basal part of the bulbs.

The armature is homeoacanthous, homeomorphous, and a characteristic basal armature is present. The hooks change continuously from compact, rounded rose-thorn-shaped (basal armature), lacking an anterior extension of the basal plate, to more slender rose-thorn-shaped hooks with anterior extension (metabasal hooks). The hooks in the basal part of the tentacle are smaller (l = 6.9-11.0; b = 6.2-8.6) than in the metabasal (l = 15.5-16.2; b = 10.0-11.0) and apical armature (l = 16.9-17.2; b = 8.6-9.3). The number of hooks per half spiral diminishes towards the apical part of the tentacle; hsr = 6-7 (basal); hsr = 5-6 (apical).

REMARKS

N. lingualis is a widely distributed species and has been recorded from the Atlantic (Dollfus 1942) and from South Australia (Palm 1999). Several elasmobranchs including Carcharhinus leucas , C. melanopterus and C. obscurus (Dollfus 1942; Bates 1990; Palm 1999) have been recorded as final hosts for this common trypanorhynch. Dasyatis violacea , Hexanchus griseus , Isurus oxyrhynchus , and Thunnus thynnus represent new host records for N. lingualis . With the exception of T. thynnus , the specimens reported here were recorded as Nybelinia sp. by Dollfus (1969).

A specimen labelled as holotype of Heteronybelinia punctatissima (Dollfus, 1960) could be reidentified as N. lingualis (see above). Thus, N. punctatissima becomes a junior synonym of N. lingualis . As Dollfus did not use the holotype for his original description of N. punctatissima in Dollfus (1960), but described specimens which were re-identified as Heteronybelinia estigmena within the present study, specimens of N. punctatissima as described by Dollfus (1960: 837-842, figs 54-59) are synonymous with Heteronybelinia estigmena (see below).