Tetrancistrum makau, Kritsky & Galli & Tingbao, 2007

Kritsky, Delane C., Galli, Paolo & Tingbao, Yang, 2007, Dactylogyrids (Monogenoidea) parasitizing the gills of spinefoots (Teleostei, Siganidae): revision of Tetrancistrum Goto and Kikuchi, 1917, with descriptions of two new species from Siganus spp. of the Red Sea and Celebes, Journal of Natural History 41 (25 - 28), pp. 1513-1551 : 1537-1543

Tetrancistrum makau nom. n.

( Figures 52–57 )

Synonym: Pseudancyrocephalus nasonis Yamaguti, 1968 .

Measurements. Dimensions of the specimen from Australia follow in brackets those of the type specimens from Hawaii. Body 775 (631–882; n 513) [484 (n 51)] long; greatest width 244 (176–325; n 514) [219 (n 51)] in posterior trunk at level of gonads. Haptor 163 (130– 191; n 57) long, 180 (134–191; n 59) [99 (n 51)] wide. Pharynx 39 (34–44; n 510) [33 (n 51)] wide. Copulatory complex 70 (64–76; n 517) [71 (n 51)] long. Ventral anchor 119 (111–126; n 517) [123 (n 51)] long; base 43 (35–48; n 517) [41 (n 51)] wide. Dorsal anchor 112 (107–118; n 517) [116 (n 51)] long; base 23 (21–25; n 517) [27 (n 51)] wide. Ventral bar 31 (27–36; n 514) [33 (n 51)] long; dorsal bar 43 (38–51; n 515) [45 (n 51)] long. Hook 12 (11–13; n 512) [12 (11–13; n 55)] long. Germarium [52 (n 51)] long, [68 (n 51)] wide; testis 126 (109–145; n 59) [63 (n 51)] long, 104 (77–140; n 59) [66 (n 51)] wide.

Source of current specimens. Naso breυirostris: off Heron Island, Great Barrier Reef, Queensland, Australia.

Type host and locality. Naso breυirostris: Hawaii .

Site of infestation. Gills.

Specimens studied. Holotype, 17 paratypes of Pseudancyrocephalus nasonis ( USNPC 63647 ); voucher specimen ( QM G 227595 ).

Preυious record. Naso breυirostris: Hawaii as Pseudancyrocephalus nasonis by Yamaguti (1968).

Etymology. The specific name, a noun, is Hawaiian ( makau 5fishhook) and refers to the haptoral anchors.

Remarks. This species is renamed Tetrancistrum makau nom. n. to avoid secondary homonymy with T. nasonis Young, 1967 that would result with the proposed transfer of Pseudancyrocephalus nasonis to Tetrancistrum . The characterization of the anchors and bars in the original description of the species by Yamaguti (1968) indicates that the dorsoventral positions of these structures were originally reversed by this author. Yamaguti’s (1968) original description is otherwise adequate for diagnosis. A single specimen of T. makau was recovered from a specimen of Naso breυirostris collected off Heron Island, Australia, which represents a new locality record for the species. This specimen was noticeably smaller than those from Hawaii but is clearly conspecific with the latter based on the morphology of the copulatory complex and anchors.

Tetrancistrum longicirrus ( Yamaguti, 1968) comb. n.

( Figures 58–63 )

Synonym: Pseudancyrocephalus longicirrus Yamaguti, 1968 .

Measurements. Body 1584 (1354–1985; n 54) long; greatest width 359 (320–416; n 55) in anterior trunk at level of copulatory complex. Haptor 137 (127–156; n 53) long, 185 (119– 250; n 53) wide. Pharynx 51 (40–70; n 55) wide. Copulatory complex 249 (224–276; n 56) long. Ventral anchor 119 (114–124; n 55) long; base 47 (43–50; n 55) wide. Dorsal anchor 105 (96–113; n 55) long; base 25 (22–26; n 54) wide. Ventral bar 25 (23–26; n 55) long; dorsal bar 43 (41–45; n 53) long. Hook 14 (13–15; n 56) long. Germarium 110 (96–139; n 54) long, 127 (109–141; n 54) wide; testis 142 (123–170; n 55) long, 132 (113–158; n 55) wide.

Type host and locality. Naso breυirostris: Hawaii .

Site of infestation. Gills.

Specimens studied. Holotype, five paratypes of Pseudancyrocephalus longicirrus ( USNPC 63645 ).

Preυious records. Naso breυirostris: Hawaii as Pseudancyrocephalus longicirrus by Yamaguti (1968). N. hexacanthus : Hawaii as P. longicirrus by Yamaguti (1968).

Remarks. The original description of this species, as Pseudancyrocephalus longicirrus , is adequate for diagnosis except that the dorsoventral positions of the anchors and haptoral bars were reversed by Yamaguti (1968). The species is transferred to Tetrancistrum as T. longicirrus ( Yamaguti, 1968) comb. n. based on the morphology of the internal body organs and haptoral armament.

Tetrancistsrum longispicularis ( Yamaguti, 1968) comb. n.

( Figures 64–69 )

Synonym: Pseudancyrocephalus longispicularis Yamaguti, 1968 .

Measurements. Dimensions of the specimens from Australia follow in brackets those of the type specimens from Hawaii. Body 1189 (1096–1390; n 510) [716 (699–741; n 53)] long; greatest width 245 (189–305; n 510) [196 (166–221; n 53)] near midlength or in posterior trunk at level of gonads. Haptor 140 (126–149; n 510) [115 (n 51)] long, 186 (149–288; n 510) [149 (n 51)] wide. Pharynx 46 (41–52; n 59) [37 (32–40; n 53)] wide. Copulatory complex 100 (90–115; n 510) [100 (97–104; n 53)] long. Ventral anchor 110 (105–114; n 510) long; base 36 (32–41; n 510) wide. Dorsal anchor 106 (101–110; n 510) [103 (96– 109; n 52)] long; base 25 (20–28; n 59) wide. Ventral bar 29 (25–34; n 59) [28 (27–30; n 53)] long; dorsal bar 42 (39–46; n 510) [42 (40–44; n 52)] long. Hook 12 (11–13; n 55) long. Germarium 92 (80–102; n 54) [55 (n 51)] long, 88 (78–98; n 54) [59 (n 51)] wide; testis 103 (90–117; n 58) [65 (n 51)] long, 90 (80–110; n 58) [77 (n 51)] wide.

Source of current specimens. Naso breυirostris: off Heron Island, Great Barrier Reef, Queensland, Australia.

Type host and locality. Naso breυirostris: Hawaii .

Site of infestation. Gills.

Specimens studied. Holotype, nine paratypes of Pseudancyrocephalus longispicularis ( USNPC 63646 ); three vouchers, USNPC 99370 , QM G 227596 .

Preυious record. Naso breυirostris: Hawaii as Pseudancyrocephalus nasonis by Yamaguti (1968).

Remarks. With the exception of the reversal of the dorsoventral axis of the haptor, the original description by Yamaguti (1968) is adequate for the diagnosis of the species. The species is transferred to Tetrancistrum as T. longispicularis comb. n. based on the arrangement and morphology of the internal organs and the morphology of the haptoral armament. Although the body dimensions and soft internal organs of specimens collected from Naso breυirostris in Australia were generally smaller than those of the type series, specimens from Australia and Hawaii are considered conspecific based on the comparative morphology of the copulatory complex. The finding of T. longispicularis on N. breυirostris in Australia is a new locality record for the helminth.

Tetrancistsrum kala ( Yamaguti, 1968) comb. n.

( Figures 70–75 )

Synonym: Pseudancyrocephalus kala Yamaguti, 1968 .

Measurements. Body 1176 (1047–1322; n 58) long; greatest width 387 (268–486; n 510) in anterior trunk at level of copulatory complex. Haptor 137 (120–153; n 58) long, 161 (131– 200; n 59) wide. Pharynx 55 (49–64; n 58) wide. Copulatory complex 92 (84–100; n 510) long. Ventral anchor 131 (123–145; n 510) long; base 46 (41–48; n 59) wide. Dorsal anchor 116 (109–124; n 510) long; base 26 (23–29; n 57) wide. Ventral bar 25 (22–28; n 57) long; dorsal bar 44 (38–52; n 54) long. Hook 13 (12–14; n 56) long. Germarium 101 (78–124; n 57) long, 122 (95–139; n 57) wide; testis 199 (162–230; n 510) long, 207 (164– 228; n 510) wide.

Type host and locality. Naso breυirostris: Hawaii .

Site of infestation. Gills.

Specimens studied. Holotype, nine paratypes of Pseudancyrocephalus kala ( USNPC 63643 ).

Preυious records. Naso breυirostris: Hawaii as Pseudancyrocephalus kala by Yamaguti (1968). N. hexacanthus : Hawaii as P. kala by Yamaguti (1968).

Remarks. Unlike all other species of Pseudancyrocephalus that Yamaguti (1968) described, the anchors and bars, and therefore the dorsoventral axis of the haptor, were correctly interpreted in the original description of this species. The original description serves as an adequate diagnosis of the species, which is transferred to Tetrancistrum as T. kala comb. n. based on the comparative morphology of the haptoral armament and internal organs.

Figures

Figures 52–57. Copulatory and haptoral sclerites of Tetrancistsrum makau nom. n. from the spotted unicornfish, Naso breυirostris, Great Barrier Reef, Australia. (52) Copulatory complex (ventral view). (53) Ventral bar. (54) Dorsal bar. (55) Ventral anchor. (56) Hook. (57) Dorsal anchor. Scale bar: 30 Mm.

Figures 58–63. Copulatory and haptoral sclerites of Tetrancistsrum longicirrus comb. n. from the spotted unicornfish, Naso breυirostris, Hawaii. (58) Copulatory complex (ventral view). (59) Dorsal anchor. (60) Hook from a presumed voucher from Hawaii on slide USNPC 63646. (61) Ventral anchor. (62) Dorsal bar. (63) Ventral bar. Scale bar: 50 Mm (58); 30 Mm (59–63).

Figures 64–69. Copulatory and haptoral sclerites of Tetrancistsrum longispicularis comb. n. from the spotted unicornfish, Naso breυirostris, Hawaii and Australia. (64) Copulatory complex (ventral view). (65) Hook from a presumed voucher from Hawaii (USNPC 63647). (66) Dorsal anchor. (67) Ventral anchor. (68) Dorsal bar. (69) Ventral bar. Scale bar: 30 Mm.

Figures 70–75. Copulatory and haptoral sclerites of Tetrancistsrum kala comb. n. from the spotted unicornfish, Naso breυirostris, Hawaii. (70) Copulatory complex (ventral view). (71) Ventral bar. (72) Dorsal bar. (73) Dorsal anchor. (74) Hook from a presumed voucher from Hawaii on slide USNPC 63646. (75) Ventral anchor. Scale bar: 30 Mm.