Capsaloides tetrapteri Yamaguti, 1968

Chisholm, Leslie A. & Whittington, Ian D., 2006, Revision of Capsaloides (Monogenea: Capsalidae) with a redescription of C. magnaspinosus Price, 1939 from the nasal tissue of Tetrapterus audax (Istiophoridae) collected off Nelson Bay, New South Wales, Australia, Zootaxa 1160, pp. 1-20 : 17-18

Capsaloides tetrapteri Yamaguti, 1968 ( Figs 3 D, 4E)

Type­host: Tetrapterus angustirostris Tanaka, 1915 (Istiophoridae) .

Type­locality: Hawaii, USA [Pacific Ocean].

Additional records: Istiophorus platypterus (Shaw, 1792) and Makaira indica (Cuvier, 1832) , from Cape Bowling Green, off Townsville and Cape Moreton, off Brisbane, Queensland, Australia [Pacific Ocean] (see Speare 1994, 1999); Makaira nigricans Lacépède, 1802 , from Cape Moreton off Brisbane, Queensland, Australia [Pacific Ocean] (see Speare 1999).

Site: Gills.

Specimens examined: Holotype (USNPC 63600); 1 voucher (QM G212196).

Remarks

Yamaguti (1968) noted the very close similarity between C. tetrapteri , C. perugiai and C. istiophori but considered C. perugiai too poorly described to make detailed comparisons. The haptoral accessory sclerites of C. tetrapteri ( Fig. 4 E) are similar morphologically to C. istiophori ( Figs 4 A, 4B) and C. perugiae ( Figs 1 F, 4D). Like C. perugiai and C. istiophori , the dorsomarginal body sclerites of C. tetrapteri are crownshaped and form a single row which ends in the posterior third of the body. The number of cusps associated with the sclerites decrease from anterior to posterior ( Fig. 3 D). We therefore regard C. tetrapteri to be a synonym of C. perugiai .

Yamaguti mounted 10 specimens (holotype and 9 paratypes) of C. tetrapteri of varying sizes on a single slide (USNPC 63600). Many of these specimens have sparse vitellarium and appear to be immature. There were 3–5 sclerites (with 5–7 cusps) in the left isolated anterior group of dorsomarginal body sclerites with larger worms generally having more sclerites in this isolated group. The right isolated group of dorsomarginal body sclerites were only visible in larger worms (> 2,130 m total length). Speare (1994, 1999) recorded C. tetrapteri from the gills of M. indica and I. platypterus off the Queensland coast, Australia. We did not find this species on any of the fish we examined off Nelson Bay, New South Wales, Australia.

Figures

FIGURE 1. Haptoral accessory sclerites of Capsaloides species. A. C. cornutus, drawn from USNPC 35136. B. C. cristatus, drawn from USNPC 63597. C. C. hoffmannae, drawn from CNHE 0 0 2718. D. C. magnaspinosus, drawn from USNPC 35648. E. C. nairagi, drawn from USNPC 63599. F. C. perugiai, redrawn from Setti (1898). G. C. sinuatus, redrawn from Goto (1894). Scale bar: 100 m.

FIGURE 3. Variation in the morphology of the dorsomarginal body sclerites of Capsaloides perugiai and those species (C. istiophori, C. marielenae and C. tetrapteri) newly synonymised with C. perugiai (present study). Note that the number of cusps associated with the crown­shaped sclerite decrease towards the posterior body region. A. C. istiophori, drawn from USNPC 63598. B. C. marielenae, drawn from CNHE 0 0 0 133. C. C. perugiai, redrawn from Setti (1898). D. C. tetrapteri, drawn from USNPC 63600. Scale bar: 10 m.

FIGURE 4. Haptoral accessory sclerites of Capsaloides perugiai and those species newly synonymised with C. perugiai. A. C. istiophori, redrawn from Yamaguti (1968). B. C. istiophori, drawn from USNPC 63598. C. C. marielenae, drawn from CNHE 0 0 0 133. D. C. perugiai, redrawn from Setti (1898). D. C. tetrapteri, drawn from USNPC 63600. Note that the only specimen of C. istiophori deposited is large and the morphology of the accessory sclerites are slightly different (B) to that drawn by Yamaguti (1968) (see A) who based his description on 28 specimens. Scale bar: 50 m.