Kotorelliella jonesi Palm & Beveridge, 2002

Palm, Harry Wilhelm & Haseli, Mohammad, 2023, Tentaculariids (Cestoda, Trypanorhyncha) of elasmobranchs from Malaysian Borneo, Zoosystema 45 (18), pp. 513-529 : 525-526

Kotorelliella jonesi Palm & Beveridge, 2002

Kotorelliella jonesi Palm & Beveridge, 2002: 74 .

MATERIAL EXAMINED. — Malaysia • 7 specimens; from Neotrygon orientalis Last, White & Serét (BO-366, 368) ( Myliobatiformes : Dasyatidae ); Malaysian Borneo ; LRP 10997 -11001 • 1 specimen; same data; ZMB E. 7740 • 3 specimens; from Neotrygon orientalis (BO-27); Malaysian Borneo ; off Sematan, Sarawak; 01°48’15.45”N, 109°46’47.17”E; LRP 10993 -1099 • 1 specimen; same data; ZMB E. 7738 • 1 specimen, LRP 10996 from Pateobatis cf. jenkinsii (Annandale) (BO-339) ( Myliobatiformes : Dasyatidae ); Malaysian Borneo , off Sarawak; 02°30’07.34”N, 110°40’16.82”E • 1 specimen; same data; ZMB E. 7739 • 1 specimen, from Maculabatis macrura (BO-93, 337) ( Myliobatiformes : Dasyatidae ); Malaysian Borneo , off Sarawak; 02°30’07.34”N, 110°40’16.82”E • 1 specimen; same data; Sabah, off Kudat ; 06°48’60.00”N, 116°53’54.00”E; ZMB E. 7736, 7737.

MEASUREMENT

Long worms, 17 625-21 000 (19 312, N =) long with 46-69 (60, N =3) proglottids. Scolex 1320-1666 (1446, N=) long; scolex width 330-427 (373, N =3, n =3) at level of pars bothrialis, 241-330 (274, N= 3, n =) at level of pars vaginalis, 322-402 (330, N=3, n= 3) at level of pars bulbosa. Pars bothrialis 515-668 (604, N= 3) long; pars vaginalis 724-1046 (869, N= 3) long. Pars bulbosa 266-322 (290, N =3) long; bulbs 240-304 (265, N =3, n =12) long, 84-108 (96, N =3, n=12) wide, bulb width: length ratio 1.0: 2.3-3.6 (2.8, N =3, n =12). Velum 250-314 (287, N =3, n= 3) long. Scolex ratio (pars bulbosa: pars bothrialis: pars vaginalis) 1.0: 1.8-2.4: 2.7-3.2 (1.0: 2.1: 2.9, N=3).

Metabasal armature homeoacanthous, heteromorphous. Metabasal armature with uncinate hooks on bothrial surface, 14-16 (15, N =, n=10) long, base 8-10 (9, N= 2, n=10) long; antibothrial hooks of metabasal armature falcate, 14-15 (14, N= 2, n= 5) long, base 4-5 (4, N= 1, n=5) long. Basal hooks heteroacanthous atypical. Bothrial hooks of basal armature 8-10 (9, N =1, n=5) long, base 6-8 (7, N= 1, n= 5) long; antibothrial hooks of basal armature 4-8 (6, N =1, n= 5) long, base 1-2 (1, N= 1, n= 5) long.

Mature proglottids wider than long, 175-275 (224, N =1, n = 5) long, 650-700 (680, N = 1, n = 5) wide; fully gravid proglottids longer than wide, 750-1150 (920, N= 1, n =5) long, 400-625 (510, N=1, n=5) wide, size increasing towards end of strobila. Testes 52-60 (57, N =1, n= 10) in diameter, 35-50 (42, N =1, n= 10) in number. Vitelline follicles 20-24 (22, N=1, n =5) in diameter.

REMARKS

Palm & Beveridge (2002) erected the monotypic genus Kotorelliella to accommodate Ko. jonesi by describing a single plerocercoid from Taeniura lymma (Forsskål) off Heron Island, Queensland, Australia. Although the specimens of Malaysian Borneo were adult, because of the poor condition of the strobilae, the internal anatomy of the proglottids could not be easily seen and hence there was no opportunity to describe the proglottids.

Schaeffner & Beveridge (2014) reported Ko. jonesi from Pateobatis jenkinsii (therein referred as Himantura jenkinsii ) (BO-335) and Pateobatis cf. jenkinsii (therein referred as Himantura jenkinsii ) (BO-339) from Malaysian Borneo. The host specimens coded as BO-366 and BO-368 have been identified morphologically as Neotrygon kuhlii but not registered in the Global Cestode Database. BO-27 is a code for Ne. orientalis in the Global Cestode Database. The only species of Neotrygon known from Borneo is Ne. orientalis . Neotrygon kuhlii is now known only from the region of the Solomon Island ( Last et al. 2016b). The record cited from Schaeffner & Beveridge (2014) predates the revision of the host species by Last et al. (2016b), but all of the records from Borneo are now referable to Ne. orientalis , not to Ne. kuhlii . Therefore, a new host record, Ne. orientalis , is established for Ko. jonesi .

Compared to the holotype of Ko. jonesi , which is a plerocercoid, the adult specimens of the present study have a smaller scolex size (1320-1666 vs 1910). Other scolex features are also smaller. Such a situation was also reported for other trypanorhynchs, e.g. Progrillotia dasyatidis Beveridge, Neifar & Euzet, 2004 (see Beveridge et al. 2004; Marques et al. 2005). This may relate to the size and the physiological condition of the intermediate host, from which it is transmitted by predation into its definitive hosts.