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 : 292-293

TRIGONOSTOMUM WATSONI SP. NOV.

( FIG. 7B )

Alternative species name: trigonostomum-watsoni sp. nov.

Holotype: Whole mount, Australia, New South Wales, Arrawarra , on Pavonina -like algae in shallow tidepool between rocks near beach, 27 August 1996.

Paratype: One whole mount.

Other material: Observations on live material. Six whole mounts and six serially-sectioned specimens, Australia, New South Wales, Lennox Head , on beach with coarse sand and on algae in tide pool, 27 October and 1 November 1997 . One whole mount, Australia, New South Wales, Arrawarra , on Sargassum sp. in permanent pool, 27 August 1996 . One whole mount, Australia, New South Wales, Arrawarra, Mullaway headland, on algae in deep rock pools, 24 July 2003 . Two whole mounts, New Caledonia, Nouméa, Magenta , permanent pool near mangroves, on large algae covered with epiphytes, 22 August 2003 .

Etymology: Dedicated to Dr Nikki Watson, Armidale, Australia, who assisted with the collection of material at Arrawarra.

Diagnosis: Trigonostomum species with copulatory organ 28–36 Mm long. Stylet 29–41 Mm long, proximally bent over 90∞. Mantle with three spine-like plates surrounds only the distal part of the stylet. Bursal appendage 62–78 Mm long, with two coiled (more than 360∞) striated tubes.

Figures

Figure 7. Copulatory organs and bursal appendages of the representatives of group 1B, A, T. coronatum: A1 copulatory organ; A2 bursal appendage. (from the neotype). B, T. watsoni sp. nov. B1, 2 copulatory organ; B3 bursal appendage (B1 from the holotype; B2, 3 from the paratype). C, T. penicillatum: C1 copulatory organ; C2 bursal appendage (from the neotype). D, T. lilliei: D1, 3 copulatory organ; D2, 4 bursal appendage. [D1, 2 specimen from Australia; D3, 4 specimen from the USA (neotype = holotype of T. prytherchi)]. E, T. breitfussi: E1 copulatory organ; E2 bursal appendage; E3 section through the bursa and the bursal appendage (different specimens from Sweden; E2, 3 freehand drawings). F, T. mirabile: F1, 2 copulatory organ; F3 bursal appendage (F1, 3 from the neotype; F2 from another specimen from the Black Sea). G, T. nataschae sp. nov. G1 Copulatory organ; G2 Bursal appendage (from the holotype).