Benedenia lolo Yamaguti, 1968

Whittington, I. D., Deveney, M. R. & Wyborn, S. J., 2001, A revision of Benedenia Diesing, 1858 including a redescription of B. sciaenae (van Beneden, 1856) Odhner, 1905 and recognition of Menziesia Gibson, 1976 (Monogenea: Capsalidae), Journal of Natural History 35 (5), pp. 663-777 : 711-713

Benedenia lolo Yamaguti, 1968

(®gures 16D, 19J±L)

Material studied. USNPC: No. 63588 (holotype and paratypes) (1 slide, 3 individuals) ex gills of Coris gaimardi (probably C. gaimard Quoy and Gaimard ) ( Labridae ) from Hawaii; MPM: No. 15402 (paratypes) (1 slide with 7 individuals) ex gills of Coris X avovittatus (probably C. X avovittata Bennett) ( Labridae ) from Hawaii; MPM: No. 15404 (paratypes) (1 slide with 14 individuals) ex gills of Coris sp. from Hawaii.

Table 4 presents comparative measurements from all specimens listed above.

Observations. Yamaguti (1968) compared B. bodiani with B. lolo , separating them on the basis of the sizes of their accessory sclerites and anterior hamuli. Figure 16 and table 2 present comparisons of the haptors and morphometric data respectively for the four Hawaiian Benedenia species and a close relative, B. epinepheli , from Japan. Benedenia lolo was described adequately by Yamaguti (1968) but a few minor diOEerences and some additional data are presented from our study of 24 specimens from three diOEerent host species. Yamaguti based his account on 40 whole-mounts. There are few size diOEerences within B. lolo from its three congeneric host species (table 4) and few diOEerences were noted in the shapes of the haptoral sclerites between parasite specimens from the respective host species.

Yamaguti (1968) depicted alae on the accessory sclerites but this appears to be haptoral tissue which is raised slightly where the accessory sclerites protrude from the ventral surface of the haptor. The proximal ends of the anterior hamuli of B. lolo overlap the proximal ends of the accessory sclerites and the distal tips of the anterior hamuli overlap the posterior hamuli for one-half to two-thirds of their length (®gure 16D). The haptoral tendons are shown in ®gure 16D. The arrangement of lobes on the marginal valve relative to the positions of the hooklets was wellrepresented by Yamaguti (1968) for B. lolo and resembles closely that for B. bodiani , B. epinepheli and B. hawaiiensis (cf. ®gure 16D, A, B and C, respectively).

The vagina of B. lolo is narrow but has a relatively conspicuous dorsal pore unadorned by sphincters or cup-shaped endings. The penis of B. lolo is muscular, the penis canal and the accessory gland reservoir are not strongly muscular and the accessory gland reservoir lies proximal to the penis and is enveloped by a proximal extension of the penis canal wall. Yamaguti described the seminal receptacle of B. lolo as indistinct and used this feature to distinguish the species from B. bodiani , B. hawaiiensis and B. scari . Our study, however, shows that while on some occasions the vaginal seminal receptacle is di cult to see in poorer specimens, it is usually present and if full of sperm, is clearly visible.

Type-host and locality. Coris gaimardi (probably C. gaimard ) ( Labridae ), Hawaii.

Published record and description. Yamaguti (1968).

Published host records. Labridae : Coris gaimardi , C. X avovittatus, Coris sp. (see Yamaguti, 1968).

Site . Gills.

Distribution. Hawaii.

Remarks. In Yamaguti’s discussion of his Hawaiian Benedenia species , he compares B. lolo only with B. epinepheli and states that they diOEer only in the pharynx shape, the relative sizes of the testes to germarium and the presence in B. lolo of a band of vitelline follicles between germarium and testes, a character which we conclude has little taxonomic value (see Remarks for B. hendor i). Benedenia lolo is most similar to B. bodiani and B. epinepheli , but B. lolo diOEers from each of these species because the accessory sclerites and the anterior hamuli are larger and the relative size of the haptor to the body in B. lolo is larger (®gures 16, 19; tables 2, 4). Benedenia lolo also diOEers from B. bodiani in that the glands of Goto of B. lolo are smaller than those of B. bodiani . Benedenia lolo is recorded from the same host family, Labridae , as B. bodiani . Benedenia lolo diOEers from B. epinepheli because it lacks the lobes near the common genital pore and vaginal pore of B. epinepheli and has lower host-speci®city than B. lolo but a labrid species is also recorded as a host for B. epinepheli (see Tsutsumi and Ito, 1965 and p. 697).

Figures

FIG. 16. Haptors of Yamaguti’s Hawaiian Benedenia species and B. epinepheli drawn to same scale from various specimens. (A) Benedenia bodiani; (B) B. epinepheli; (C) B. hawaiiensis; (D) B. lolo; (E) B. scari. Scale bar 5 250 Mm. Note tendon (te).