Heteronybelinia yamagutii (Dollfus, 1960)

Palm, Harry W. & Walter, Thorsten, 2000, Tentaculariid cestodes (Trypanorhyncha) from the Muséum national d’Histoire naturelle, Paris, Zoosystema 22 (4), pp. 641-666 : 658-660

Heteronybelinia yamagutii (Dollfus, 1960)

Nybelinia yamagutii Dollfus, 1960 .

MATERIAL EXAMINED.— Described by Dollfus (1960), Palm et al. (1997) and Palm (1999), holotype from Sphoeroides pachygaster (Müller & Troschel, 1848) (junior synonym Liosaccus cutaneus [Günther, 1870]) ( MNHN 719-720 HF).

Mixonybelinia edwinlintoni (Dollfus, 1960) n.comb. (Fig.9)

Nybelinia edwinlintoni Dollfus, 1960 .

MATERIAL EXAMINED.— Gorée. Senegal, described by Dollfus (1960), holotype of Nybelinia edwinlintoni from Sphyrna lewini (Griffith & Smith, 1834) (junior synonym Sphyrna diplana Springer, 1941 ) ( MNHN 721 HF).

Joal. Dakar, Senegal, 04. VI.1946, 2 adults from the intestine of Sphyrna tudes (Valenciennes, 1822) ( MNHN 784-787 HF).

Itamaraca. Brazil, 19.VIII.1993, leg. H. W. Palm, 2 postlarvae from the body cavity of Pseudupeneus maculatus (Bloch, 1793) (MNHN 788-789 HF).

DESCRIPTION

Measurements of two specimens from Sphyrna lewini and two specimens from S. tudes : sl = 1890, 1980, 2610, 2340; sw = 1080, 1190, 1710, 1080; pbo = 714, 1090, 1485, 1200; pv = 700, 900, 1215, 900; pb = 602, 588, 745, 750; ppb = 25, 45, 320, nm; vel = 560, 600, 210, 490; app = not present, 364, 490; bl = 581 (540-616), 523 (518-532), 623 (616-630), 581 (560-610); bw = 168 (154-182), 243 (238-252), 196 (182- 196), 203 (196-210); br = 3.5:1, 2.2:1, 3.2:1, 2.9:1; sp = 1.2:1.2:1; 1.9:1.5:1, 2.0:1.6:1, 1.6:1.2:1. The tentacle sheaths are straight; tsw = 70-80, 85-95, 56-77, 86-95. Prebulbar organs absent, muscular rings around the basal part of the tentacle sheaths visible in some specimens.

The retractor muscles originate in the basal part of the bulbs (Fig.9A). A basal tentacular swelling is absent; tw basal = 88-90, 89-90, 72-76, 79-80,

tw metabasal = nm, 90-91, 80-90, 86-89.

The metabasal armature of the latter three specimens is homeoacanthous, heteromorphous (Fig.9B), a characteristic homeomorphous basal armature consisting of about 13-15 rows of slen- der hooks is present (Fig.9C). Metabasal armature of strongly re-curved hooks along bothridial surface: l = 23.9-27.8, 24.0-29.1, 25.1-27.8; b = 15.0-18.1, 15.2-18.9, 15.0-17.8; slender falcate hooks along antibothridial surface: l = 27.0- 30.0, 24.1-33.9, 28.0-30.8; b = 12.0-13.2, 12.9- 17.1, 13.0-14.5. Basal hook size: l = 17.0-18.1, 16.9-23.1, 17.1-24.3; b = 13.1-13.5, 11.5- 13.1, 12.5-14.0; hsr basal = 7-8; hsr metabasal = 8-9.

The strobila is craspedote (Fig.9D), with about 216, 266 segments behind the velum. Proglottids wider than long, larger towards the end of strobila (420-670 × 41-130, 560-1050 × 56-112). Ovary median, follicular. Vitelline follicles numerous, in multiple layers, 13-27 in diameter, smallest follicles near periphery of proglottid. Other internal structures of the proglottids not visible.

REMARKS 15-17, 15-17. Prebulbar organs and muscular The type specimen of Mixonybelinia edwinlintoni rings around the basal part of the tentacle sheaths n.comb. has only partly everted tentacles with 12- are not visible. The retractor muscles originate in 13 rows of hooks. Re-examination of that material the basal part of the bulbs. revealed a homeomorphous armature. Two fur- The armature is homeoacanthous, heteromorther specimens in the Dollfus collection labelled as phous. The basal hooks on the bothridial surface Nybelinia sp. (MNHN 784-787 HF) and also col- measured l = 6.5-7.0; b = 5.0-5.5. lected from the Dakar region revealed a homeo- The strobila is acraspedote, with about 40 segmorphous basal armature of about 13 rows of ments. The first 30 proglottids are wider than hooks and a heteromorphous metabasal armature, long (112-210 wide × 20-140 long), latter proconsisting of slender strongly re-curved hooks on glottids increase in size towards 224-336 wide × the bothridial tentacle surface. Measurements of 238-378 long. Testes in single layer of differing the basal hooks and the scolex appeared to be simi- shapes, 17-30 in diameter in the first and 50-70 lar to the type material of N. edwinlintoni and the- in final proglottids, 57-62 testes per proglottid. refore was identified as accordingly. The same tentacular armature was also observed in speci- REMARKS mens obtained from Pseudupeneus maculatus from The specimens described here from the Black Sea the north-east Brazilian coast, which were also have small scoleces, but correspond in scolex identified as belonging to N. edwinlintoni by Palm morphology and hook size with the worms as (1997b). The author overlooked the change of the described by Euzet & Radujkovic (1989), which hook form from homeomorphous towards hetero- were collected from Dasyatis pastinaca from the morphous in some specimens with completely Mediterranean. Thus, the present specimens are everted tentacles. The scolex measurements cor- considered conspecific with Kotorella pronosoma . respond between these specimens. Thus, N. ed- It is interesting to note that the testes number of winlintoni can be considered as species with a 57-62 we observed differed from the value of 37 homeomorphous basal armature of about 13 rows observed by Euzet & Radujkovic (1989: fig.2). and a heteromorphous metabasal armature, oc- However, Palm & Walter (1999) recorded up to curring in the tropical East and West Atlantic. 48 testes per proglottis for K. pronosoma , and the The present finding is the first record of the adult testes diameter with 17-70 and 37-64 depending M. edwinlintoni and Sphyrna tudes represents a on the size of the proglottid lies within the same new host record. range. The present findings from the Black Sea represent a new locality record. Kotorella pronosoma (Stossich, 1901) Kotorella pronosoma is a species with a wide geographical distribution, as is seen by its occurrence Rhynchobothrium pronosomum Stossich, 1901 . in the Mediterranean, the Gulf of Mexico, Sri Nybelinia rhynchobatus Yang et al., 1995 . New synonym. Lanka and Indonesia (Euzet & Radujkovic 1989; MATERIAL EXAMINED.— Agigea. Romania, leg. N. Palm & Walter 1999; Palm & Overstreet 2000). Bacesco, 2 adults from the intestine of Dasyatis pasti- Recently, Yang et al. (1995) described N. rhynnaca (Linnaeus, 1758) (MNHN 727 HF). chobatus Yang et al., 1995. Judging by the illustrations given by the authors (fig.1a-d), DESCRIPTION N. rhynchobatus has elongated, distinctly spaced sl = 483, 616; sw = 240, 168; pbo = 392, 392; bothridia, short bulbs and a pars bothridialis not pv = 336, 440; pb = 79, 83; vel = 69, 98; bl = 84 overlapping the pars bulbosa. More importantly, (82-86), 76 (74-79); bw = 42 (41-43), 38 (36- fig.1c-d shows acraspedote proglottids, longer 39); br = 2.0:1, 2.0:1; sp = 5.0:4.0:1, 4.7:5.3:1. than wide, with a pre-equatorial genital atrium. tw basal = 20, nm. A basal tentacular swelling is The cirrus sac is directed medially from the geniabsent. The tentacle sheaths are straight; tsw = tal atrium, and the testes number is 36-48. This corresponds exactly with the descriptions of Kotorella pronosoma and the medially orientated cirrus sac is not known in any species of Nybelinia , Heteronybelinia and Mixonybelinia species. Thus, we consider Nybelinia rhynchobatus to be conspecific with K. pronosoma .