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 : 291

TRIGONOSTOMUM SPINIGERUM SP. NOV.

( FIGS 8F, H , 11B )

Alternative species name: trigonostomum-spinigerum sp. nov.

Holotype: Whole mount, New Caledonia, Nouméa, Nouville, on algae in a lagoon south of the asylum, 3 August 2003 ( LUC no. 231).

Etymology: Refers to the spines on the mantle surrounding the stylet; spinigerum (L.) = prickly, spiny, thorny.

Diagnosis: Trigonostomum species with copulatory organ 61 Mm long. Stylet 57 Mm long, proximally bent over almost 90∞. Mantle surrounds the whole stylet and carries 8–10 small spines on the convex side. Bursal appendage ± 35 Mm long, proximally funnel-shaped with two heavily coiled distal tubes, very faintly striated.

Remarks: The bursal appendage is measured (and drawn) on the whole mount, in which it appeared extremely thin-walled. Therefore, the length (35 Mm) has to be interpreted as the minimum length. Furthermore, only one distal tube could be observed (two in the live individual), probably because both tubes are situated exactly above each other in the mounted specimen.

Figures

Figure 8. A, rostral spot in T. armatum (whole mounted specimen from Curaçao). B, dorsal stripe in T. setigerum (whole mounted specimen from Greece). C, bursal appendage of T. tori sp. nov. (from the paratype). D, constricted distal tubes of bursal appendage (arrow indicates constriction) in T. setigerum (specimen from Bermuda). E, copulatory organ of T. denhartogi comb. nov. (specimen from New Caledonia). F, copulatory organ of T. spinigerum sp. nov. (from the holotype). G, habitus of T. franki sp. nov. (live specimen from New Caledonia). H, bursal appendage of T. spinigerum sp. nov. (from the holotype). I, head region of T. franki sp. nov. showing both epidermal and subepidermal pigment (live specimen from New Caledonia). Scale bars: A, B = 200 Mm. C-F = 20 Mm. H = 10 Mm.

Figure 11. A, T. denhartogi comb. nov. A1, 3 copulatory organ; A2 bursal appendage (A1, 2 specimen from Curaçao; A3 specimen from New Caledonia). B, T. spinigerum sp. nov. B1 copulatory organ; B2 bursal appendage (from the holotype). Abbreviations: a-e, explained in text.