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A New Species of Calliobothrium (Tetraphyllidea: Onchobothriidae) from the Whiskery Shark, Furgaleus macki, in Australia
J. N. Caira and T. R. Ruhnke
The Journal of Parasitology
Vol. 76, No. 3 (Jun., 1990), pp. 319-324
Stable URL: http://www.jstor.org/stable/3282658
Page Count: 6
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Calliobothrium pritchardae n. sp. is described from the whiskery shark, Furgaleus macki (Whitley, 1943), collected from Young Rocks in South Australia. This species differs from the 7 other known species of Calliobothrium in its possession of 2 rather than 3 posthook loculi. It is further distinguished from all other Calliobothrium species except Calliobothrium evani in its possession of asymmetrical hooks. The lack of an accessory piece between the bases of the axial hooks and medial axial hook bases that are longer than the lateral axial hook bases further distinguish the new species from C. evani in which an accessory piece is present and the relative lengths of the medial and lateral axial hook bases are reversed. Scanning electron microscopy reveals spiniform microtriches on the neck and proximal bothridial surfaces, filiform microtriches on the apical bothridial surfaces, and a combination of the 2 microthrix types on the distal bothridial surfaces. The extended bases of the axial hooks are densely covered with spiniform microtriches. In addition, the number of testes within worms decreases substantially in progressively posterior (older) segments. The generic diagnosis of Calliobothrium is emended to include this species with 2 rather than 3 posthook loculi.
The Journal of Parasitology © 1990 The American Society of Parasitologists