Trigonostomum, 2004

Willems, Wim R., Artois, Tom J., Vermin, Wouter A. & Schockaert, Ernest R., 2004, Revision of Trigonostomum Schmidt, 1852 (Platyhelminthes, Typhloplanoida, Trigonostomidae) with the description of seven new species, Zoological Journal of the Linnean Society 141 (2), pp. 271-296 : 286

TRIGONOSTOMUM AUSTRALIS SP. NOV.

( FIGS 5D , 9D , 10D; TABLE 1)

Alternative species name: trigonostomum-australis sp. nov.

Holotype: Whole mount, Australia, Queensland, North Stradbroke Island, Point Lookout , algae in tidepool, 12 August 1996.

Other material: Observations on live material. Two whole mounts from Australia, New South Wales, Arrawarra , on Sargassum sp., 28 August 1996 and 1 November 1997 .

Etymology: Reflects the species’ occurrence in the southern hemisphere.

Diagnosis: Trigonostomum species with coiled copulatory organ, with three whole spires. Stylet 414– 445 Mm long, enveloped by the mantle over its entire length. Mantle distally split into two spiny plates with terminal hook. Bursal appendage 34 Mm long, proximally curved over 270∞ and with straight distal section.

Figures

Figure 5. Schematic representation of the copulatory organ of the representatives of group 2, showing the different number of spires (dashed lines indicate the location of the mantle plates). A, T. franki sp. nov. (1/ spire). B, T. armatum. (11/ 2 2 spires). C, T. setigerum. (21/ spires). D, T. australis sp. nov. (31/ spires). E, T. galapagoensis sp. nov. (41/ spires). F, 2 2 2 T. tori sp. nov. (51/ spires).

Figure 9. Copulatory organ of the representatives of group 2. A, T. franki sp. nov. (specimen from Curaçao) B, T. armatum (specimen from Curaçao). C, T. setigerum (from the neotype). D, T. australis sp. nov. (from the holotype). E, T. galapagoensis sp. nov. (from the holotype; after Ehlers and Ax, 1974: fig. 13C). F, T. tori sp. nov. (from the holotype). Scale bars: A-D, F = 20 Mm.

Figure 10. Copulatory organs and bursal appendages of the representatives of group 2. A, T. franki sp. nov. A1, 3 copulatory organ; A2, 4 bursal appendage (A1, 2 from the holotype; A3, 4 from a specimen from Kenya). B, T. armatum sp. nov. B1, 3 copulatory organ; B2, 4 bursal appendage (B1, 2 specimen from France; B3, 4 specimen from Curaçao). C, T. setigerum: C1 copulatory organ; C2 bursal appendage (specimen from Kenya). D, T. australis sp. nov. D1 copulatory organ; D2 bursal appendage (from the holotype). E, T. tori sp. nov. E1 copulatory organ; E2 bursal appendage (from the holotype).