Pseudohaliotrema molnari, Lim, 2010

Lim, L. H. S., 2010, Three new species of Pseudohaliotrema Yamaguti, 1953 (Monogenea: Ancyrocephalidae) from Siganus species (Siganidae) and the description of a mechanism for cross-insemination, Journal of Natural History 36 (14), pp. 1639-1660 : 1648-1650

Pseudohaliotrema molnari n. sp.

(gures 2b, 3)

Description

Body small to medium, 820 (722–966) Ö 218 (210–235); body proper broad, narrow cephalic region; three pairs of head-organs; four eye-spots consisting of scattered pigment; long peduncle, 112 (84–126) Ö 81 (75–84), separating body and haptor. Intestinal caeca con uent just anterior to peduncle. Haptor broader than long, 81 (75–84) Ö 100 (92–109); dorsal anchors with well-developed roots, inner length 31 (30–32), outer length 21 (20–22), inner root 13 (12–14), outer root 3 (2–4), point 5 (4–6); ventral anchors smaller with expanded outer root, inner length 21 (20–22), outer length 19 (18–20), inner roots 7 (6–8), outer roots 3 (2–4), points 5 (4–6); dorsal bar V-shaped, 3 (3–4) Ö 17 (16–18); ventral bar rod- to V-shaped, 4 (3–4) Ö 20 (19–21); 14 marginal hooks of larval type, length 10 (9–11). Testis elongate ovoid, sinistral, lateral to ovary; vas deferens leaves left anterior margin of testis, passing intercaecally, extending anteriorly to level of male organ, distending to form seminal vesicle; then descending, narrowing as ejaculatory duct, entering proximal part of male organ. Male organ consisting of two sclerotized parts: sclerotized club-like piece (ap 1 in gure 3f) with large obscure proximal opening (indicated by arrow in gure 3f) through which ejaculatory duct and duct from prostatic reservoir enter; truncated sclerotized piece (ap 2 in gure 3f) with large proximal opening. Spermatophore chamber antero-ventral to male organ, with ventral opening, containing spermatophore. (Shape and size of spermatophore, diYcult to ascertain because of distortion, but larger than that of P. virgata n. sp.) Left and right prostatic glands antero-lateral to male organ; left and right prostatic ducts join, forming common duct which enters large sausage-shaped prostatic reservoir; duct from prostatic reservoir enters initial part of male organ. Ovary dextral; oviduct leaves anterior part of ovary, oötype receiving ducts from Mehlis’ gland and seminal receptacle. Uterus ascends mid-ventrally; uterine pore ventral, close to sclerotized male organ. Large dextro-lateral vaginal pouch houses eversible spermatophore transfer tube; vaginal duct connected to seminal receptacle. Vitelline system

Three new species of Pseudohaliotrema 1649 co-extensive with intestinal caeca; lateral elds of follicle con uent posterior to intestinal caeca.

Type-host. Siganus virgatus (Valenciennes) .

Type-locality. OV Singapore.

No. of specimens measured. Twenty.

Type-specimens. HOLOTYPE ( BM (NH) No. 2001.4.30 .6) and PARATYPES ( BM (NH) Nos 2001.4.30.7 –8) in The Natural History Museum, London. Other paratypes in the author’s collection .

Etymology. This species is named for Dr Kalman Molnar, Hungarian Veterinary Institute, Budapest, Hungary.

1650 L. H. S. Lim

Comments

This species is similar in size to P. sphincteroporus , larger than P. virgata n. sp. and P. sigani but smaller than P. falcata n. sp. (see gure 2). It diVers from P. virgata n. sp. in having a larger male organ (almost twice the size), a longer vaginal duct, a larger vaginal pouch and a longer peduncle. This species is similar to P. sphincteroporus in the structure of the anchors, but diVers in having a truncated sclerotized piece in the male organ (see ap 2 in gure 3f) rather than a bi d piece and absence of the prominent muscular genital pore. Although the spermatophores are usually found distorted inside the vaginal pouch of P. molnari n. sp. and their de nite size could not be determined accurately, they appear to be comparatively larger than those of P. virgata n. sp. ( table 2).