Nybelinia thyrsites Korotaeva, 1971

Palm, Harry W. & Walter, Thorsten, 2000, Tentaculariid cestodes (Trypanorhyncha) from the Muséum national d’Histoire naturelle, Paris, Zoosystema 22 (4), pp. 641-666 : 652-654

Nybelinia thyrsites Korotaeva, 1971

MATERIAL EXAMINED.— New Zealand. 1829, leg. Quoy & Gaimard, 2 postlarvae from the intestine of Squalus sp. ( MNHN 777-778 HF). Material from the same origin was described by Dollfus (1942) and Beveridge & Campbell (1996) as 2 specimens from unknown host and locality ( MNHN A 2 R 1140).

DESCRIPTION

sl = 1148, 1162; sw = 840, 938; pbo = 518, 518; pv = 364, 434; pb = 350, 350; ppb = 0, 10; app = 294, 322; vel = 340, 392; bl = 310 (294-322), 320 (308-336); bw = 129 (120-140), 143 (126- 155); br = 2.4:1, 2.2:1; sp = 1.5:1:1, 1.5:1.2:1; tentacle sheaths are irregularly coiled, tsw = 51- 55, 41-44; tw basal 48-52, 48-51; tw metabasal = 45-48, 45-48; a basal tentacular swelling is absent. Prebulbar organs and muscular rings around the basal part of the tentacle sheaths are not visible. The retractor muscles originate at the base of the bulbs.

The tentacular armature is homeoacanthous, homeomorphous and a characteristic basal armature is absent. The hooks in the basal part of the tentacle are smaller (l = 14.3-17.1, 12.9-16.7; b = 11.0-13.1, 10.2-13.0) than in the metabasal armature (l = 18.1-20.1, 17.8-21.0; b = 14.1- 15.1, 13.4-15.1), and diminish in size towards the apical part; basal: hsr = 7-8; metabasal: hsr = 7-8.

REMARKS

Nybelinia thyrsites is adequately described in Beveridge & Campbell (1996). The present material was not labelled in the Dollfus collection but the similar scolex and hooks as given in Beveridge & Campbell (1996) enable a reliable identification. The present material (collected by Quoy & Gaimard in 1829) was interpreted by Beveridge & Campbell (1996) as belonging to N. thyrsites . The present description of two further specimens confirms this finding.

the

Heteronybelinia estigmena (Dollfus, 1960)

(Fig.6)

Nybelinia estigmena Dollfus, 1960 .

Nybelinia alloiotica Dollfus, 1960 .New synonym. Nybelinia cadenati Dollfus, 1960 .New synonym. Nybelinia oodes Dollfus, 1960 .New synonym.

Nybelinia punctatissima Dollfus, 1960 .New synonym. Nybelinia senegalensis Dollfus, 1960 .New synonym.

TYPE MATERIAL.— Deposited under MNHN 704 - 708 HF, described in Dollfus (1960).

Gorée. Senegal, holotype and paratypes of Heteronybelinia estigmena from Alectis alexandrinus (Geoffroy St Hilaire, 1817) (junior synonym Hynnis goreensis Cuvier, 1833) and from Boops boops (Linnaeus, 1758).

Dakar. Senegal, paratypes from Selene setapinnis (Mitchill, 1815).

MATERIAL EXAMINED.— Gorée. Senegal, leg. J. Cadenat, 2 postlarvae from the branchial cavity of Sphyraena guachancho Cuvier, 1829 (MNHN 698-

699 HF).— Postlarva from the branchial cavity of Coryphaena equisetis Linnaeus, 1758 (MNHN 700 HF).— Postlarva from the branchial cavity of Epinephelus fasciatus (Forsskål, 1775) (junior synonym Epinephelus alexandrinus [Valenciennes, 1828]) (MNHN 701).— Postlarva from the branchial cavity of Fistularia tabacaria Linnaeus, 1758 (MNHN 702 HF).— Postlarva from the branchial cavity of Alectis alexandrinus (Geoffroy St Hilaire, 1817) (MNHN 703 HF).— Postlarva from the gills of Pomadasys incisus (Bowdich, 1825) (junior synonym Pristipoma bennetti Lowe, 1838) (MNHN 692

HF).— Postlarva from the gills Echeneis of naucrates

Linnaeus, 1758 (MNHN 713 HF).— Postlarva from the branchial cavity of Sphyraena guachancho Cuvier,

1829 (MNHN 712 HF).— Postlarva from the branchial cavity of Seriola dumerili (Risso, 1810)

( MNHN 715 HF).— Postlarva from the branchial cavity of Alectis alexandrinus (Geoffroy St Hilaire,

1817) (MNHN 714 HF).— Postlarva from the branchial cavity of Alectis alexandrinus (Geoffroy St

Hilaire, 1817) (MNHN 717 HF).— Postlarva from the branchial cavity of Caranx rhonchos Geoffroy St

Hilaire, 1817 (MNHN 718).

Joal. Dakar, Senegal, 16. III.1946, leg. J. Cadenat, 1

adult from the intestine of Carcharinus obscurus

(LeSueur, 1818) (MNHN 811- 812 HF).

Salerno. Florida, USA, 1948, leg. N. W. Riser, 2

adults from the spiral valve of Carcharhinus leucas

(Valenciennes, 1839) (junior synonym Eulamia platyo-

don [Poey, 1861]), ( MNHN 779-781 HF).

REMARKS FIG. 6. — Heteronybelinia estigmena (= holotype Nybelinia Heteronybelinia estigmena was described by oodes ) from Pomadasys incisus , metabasal armature, external Dollfus (1960) from three different host species, surface, bothridial face on right hand side. Scale bar: 10 µm.

Boops boops (Linnaeus, 1758) , Alectis alexandrinus (Geoffroy St Hilaire, 1817) and Selene seta- and tentacular armature of the holotype of pinnis (Mitchill, 1815). The same hosts also N. oodes correspond with those given for harboured specimens of H. cadenati and H. sene- H. estigmena . Thus we conclude the synonymy galensis. Similarly, Sphyraena guachancho harboured of the above examined material with H. estigmetwo of the Heteronybelinia species , H. alloiotica na. This synonymy demonstrates that Hetero- and H. punctatissima . Re-examination of the nybelinia estigmena at Gorée can infest several type material revealed only minor differences in teleost species. A wide host range of Nybelinia scolex morphology and tentacular armature of and Heteronybelinia species at the same locality the specimens described by Dollfus (1960), lying has also been demonstrated for Nybelinia africawithin the range of intraspecific morphological na and Heteronybelinia yamagutii by Palm et al. variability as described for other Nybelinia and (1997).

Heteronybelinia species (Palm 1999; present Within the collection of Dollfus at the MNHN, study). Dollfus (1960) described N. oodes as a the slides carrying Heteronybelinia estigmena , species with a homeomorphous tentacular arma- H. alloiotica , H. cadenati , H. senegalensis , and ture. In contrast to the description given by Heteronybelinia punctatissima were labelled only Dollfus (1960), re-examination of the holotype as Nybelinia sp. Identification to species was diffideposited in the MNHN also reveals a hetero- cult on the basis of morphometrical measuremorphous tentacular armature (Fig.6). The ments due to the similarity between them. hook form changes slightly from the bothridial Assignment, however, was possible on the basis (basal: l = 6.6-8.5, b = 6.6-8.5; metabasal: l = of original hosts and drawings (Dollfus 1960). A -10.5-11.8, b = 8.5-10.2) towards the antibo- further specimen of Nybelinia punctatissima thridial tentacle surface (basal: l = 5.3-7.2, b = ( MNHN 693 HF) from Scomber scombrus 4.7-5.6; metabasal: l = 7.9-9.2, b = 7.2-8.5), and Linnaeus, 1758, labelled as the holotype but not slightly increases in size towards the metabasal described in Dollfus (1960), was re-identified as part of the tentacles. The scolex morphology belonging to N. lingualis . Thus, N. punctatissima is a junior synonym of N. lingualis (Cuvier, 1817) (see Remarks for N. lingualis above), and the specimens described as N. punctatissima in Dollfus (1960: 837-842, figs 54-59) are synonymous with H. estigmena .

Palm (1999) acted as first reviser chosing N. estigmata as the valid name for this taxon (article 24 of the International Code of Zoological Nomenclature).