Euryhaliotrema chrysotaeniae ( Young, 1968 ) Kritsky & Boeger, 2002

Kritsky, Delane C. & Boeger, Walter A., 2002, 41: New and previously described species of Dactylogyridae (Platyhelminthes) from the gills of marine and freshwater perciform fishes (Teleostei) with proposal of a new genus and a hypothesis on phylogeny, Zoosystema 24 (1), pp. 7-40 : 30-32

Euryhaliotrema chrysotaeniae ( Young, 1968) n. comb.

( Fig. 11 A-G) Haliotrema chrysotaeniae Young, 1968: 55 , 56. TYPE HOST AND LOCALITY. — Gills of Lutjanus chrysotaenia , a junior synonym of L. carponotatus (Lutjanidae) : Heron Island, Queensland, Australia ( Young 1968). MATERIAL EXAMINED. — Holotype (USNPC 61274); paratype (USNPC 61275).

MEASUREMENTS

Body 529 (485-574; n = 2) long, fusiform; greatest width 146 (124-168; n = 2); pharynx 35 (32-39; n = 2) in diameter; haptor 93 (85-101; n = 2) wide, 70 (61-79; n = 2) long; ventral anchor 41 (39-43; n = 2) long, base 18 (17-19; n = 2) wide; dorsal anchor 35-36 (n = 2) long, base 16-17 (n = 2) wide; ventral bar 25 (24-26; n = 2) long, dorsal bar 37-38 (n = 2) long; hook 13-14 (n = 4) long, FH loop about shank length; copulatory organ 495 (n =1) long; coil clockwise; ring diameter 44 (41-47; n = 2); accessory piece 36 (32-39; n = 2) long; testis 80 (69-91; n = 2) long, 83 (70-96; n = 2) wide; germarium 57 (53-61; n = 2) long, 39 (30- 48; n = 2) wide; vaginal aperture dextroventral.

REMARKS

This species, originally placed in Haliotrema and adequately described by Young (1968), is transferred to Euryhaliotrema n. gen. as E. chrysotaeniae n. comb. It, E. johni n. comb. and E. lutiani n. comb., parasitize lutjanid hosts and form a monophyletic lineage within Euryhaliotrema n. gen. Euryhaliotrema chrysotaeniae n. comb. differs from E.johni n. comb. and E.lutiani n. comb. in possessing a delicate copulatory organ with more than three rings and an elongate meandering vaginal canal (vaginal canal comparatively short in E. johni n. comb. and E. lutiani n. comb.).

Euryhaliotrema lutiani ( Yamaguti, 1953) n. comb. ( Fig. 11 H-N)

Haliotrema lutiani Yamaguti, 1953: 211 , 212.

TYPE HOST AND LOCALITY. — Gills of Lutjanus sp.

(Lutjanidae): Macassar, Celebes ( Yamaguti 1953).

MATERIAL EXAMINED. — Holotype, five paratypes

( MPM 22640).

MEASUREMENTS

Body 840 (730-922; n = 4) long, fusiform; greatest width 168 (163-175; n = 3); pharynx 41 (35-46; n = 6) in diameter; haptor 93 (83-111; n = 4) wide, 75 (67-89; n = 4) long; ventral anchor 35 (32-36; n = 6) long, base 18 (16-20; n = 2) wide; dorsal anchor 35 (34-36; n = 6) long, base 19 (16-20; n = 6) wide; ventral bar 28 (24-32; n = 6) long, dorsal bar 40 (38-44; n = 6) long; hook 14 (13-15; n = 9) long, FH loop about shank length; copulatory organ 65 (n =1) long, coil clockwise, ring diameter 24 (21-27; n = 3); accessory piece 26 (22-28; n = 4) long; testis 232 (218-242; n = 3) long, 111 (106- 115; n = 3) wide; germarium 56-57 (n = 1) long, 36-37 (n = 1) wide; vaginal aperture dextroventral.

REMARKS

Yamaguti (1953) described this species as Haliotrema lutiani Yamaguti, 1953 . His description, while basically adequate, lacks drawings of the haptoral armament and copulatory complex, which are provided herein for comparative purposes. The species is transferred to Euryhaliotrema n. gen. as E. lutiani n. comb. It is most similar to E. johni n. comb. based on the morphology of the copulatory complex. Euryhaliotrema lutiani n. comb. and E. johni n. comb. differ in comparative morphology of the haptoral armament and vagina.

Euryhaliotrema johni ( Tripathi, 1959) n. comb. ( Fig. 11 O-U)

Ancyrocephalus johni Tripathi, 1959: 44-46 .

Haliotrema johnii ( Tripathi, 1959) – Young, 1968: 43.

TYPE HOST AND LOCALITY. — Gills of Lutjanus johnii

(Lutjanidae): River Hooghly at Diamond Harbor,

India ( Tripathi 1959).

MATERIAL EXAMINED. — Four voucher specimens

( USNPC 61273).

OTHER RECORDS. — Lutjanus johnii (Lutjanidae) :

Green Island, Queensland, Australia ( Young 1968).

Lutjanus fulviflamma (Lutjanidae) : Heron Island,

Queensland, Australia ( Young 1968).

MEASUREMENTS

Body 730 (711-747; n = 3) long, fusiform; greatest width 148 (145-153; n = 3); pharynx 44

(41-48; n = 3) in diameter; haptor 93 (82-99; n = 3) wide, 67 (65-69; n = 3) long; ventral anchor 35- 36 (n = 2) long, 24-25 (n=1) wide; dorsal anchor 32 (31-34; n = 3) long, 20-21 (n=1) wide; ventral bar 22-23 (n = 2) long, dorsal bar 39 (37-42; n = 2) long; hook 14-15 (n = 8) long, FH loop about shank length; copulatory organ 120 (n =1) long, coil clockwise, ring diameter 28 (21-32; n = 3); accessory piece 29 (26-31; n = 3) long; testis 232 (218-242; n = 3) long, 111 (106-115; n = 3) wide; germarium 51 (45-57; n = 2) long, 31 (26-36; n = 2) wide; vaginal aperture dextroventral.

REMARKS

The original description of this species by Tripathi (1959) as Ancyrocephalus johni Tripathi, 1959 is inadequate. Young (1968) redescribed the species and transferred it to Haliotrema based on specimens collected in Queensland, Australia. The species is herein transferred to Euryhaliotrema n. gen. as E. johni n. comb., where it most closely resembles E. lutiani n. comb. Differentiation of these two species is accomplished in the Remarks for E. lutiani n. comb.

Figures

FIG. 11. — Sclerotized structures of Euryhaliotrema n. gen. species; A-G; Euryhaliotrema chrysotaeniae (Young, 1968) n. comb.; A, vagina (ventral view); B, ventral anchor; C, dorsal anchor; D, ventral bar; E, dorsal bar; F, hook; G, copulatory complex (ventral view); H-N; Euryhaliotrema lutiani (Yamaguti, 1953) n. comb.; H, ventral anchor; I, dorsal anchor; J, ventral bar; K, dorsal bar; L, vagina (ventral view); M, hook; N, copulatory complex (dorsal view); O-U; Euryhaliotrema johni (Tripathi, 1959) n. comb.; O, ventral anchor; P, dorsal anchor; Q, ventral bar; R, vagina (ventral view); S, hook; T, copulatory complex (ventral view); U, dorsal bar. Scale bar: 25 µm.