Trigonostomum galapagoensis, Willems, Wim R., Artois, Tom J., Vermin, Wouter A. & Schockaert, Ernest R., 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 : 288

TRIGONOSTOMUM GALAPAGOENESIS SP. NOV.

( FIGS 5E , 9E; TABLE 1)

Alternative species name: trigonostomum-galapagoensis sp. nov.

Trigonostomum setigerum Ehlers & Ax, 1974: 664– 666 , 668, fig. 13A- C.

Holotype: One micrograph (fig. 13C in Ehlers & Ax, 1974), Galapagos ( Ecuador), Santa Cruz, Bahía Academy ( Ehlers & Ax, 1974).

Etymology: The islands where the type material was found.

Diagnosis: Trigonostomum species with coiled copulatory organ, four whole spires. Stylet enveloped by the mantle over its entire length. Mantle distally split into two spiny plates with terminal hook. Bursal appendage coiled, with two tubules.

Remarks: Pigment spot rostrally, between the eyes (see Ehlers & Ax, 1974: fig. 13A). The length of both hard parts, copulatory organ and bursal appendage, could not be measured, because this species is only known from a micrograph of a live individual ( Ehlers & Ax, 1974: fig. 13), without a scale bar.

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.