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.