Trigonostomum mirabile, (Pereyaslawzewa, 1893)

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 : 289

TRIGONOSTOMUM MIRABILE ( PEREYASLAWZEWA, 1893)

GRAFF, 1913

( FIG. 7F )

Alternative species name: trigonostomum-mirabile

Hyporhynchus mirabilis Pereyaslawzewa, 1893: 267 , t. 4, fig. 27.

Trigonostomum mirabile Graff, 1913: 310–311 , fig. 273; Meixner, 1924b: 96, 98; Ax, 1959: 98–99, figs 80, 81; Mack-Fira, 1968: 179–180, figs 2–4; 1974: 249, 265, 273, 281, 284.

Proxenetes lictor Beklemischev, 1927: 190–191 , 203– 204, t. I, figs 8, 9.

Known distribution: Black Sea ( Pereyaslawzewa, 1893; Beklemischev, 1927; Ax, 1959; Mack-Fira, 1968, 1974); Sea of Marmara ( Ax, 1959).

New locality: Romania, Black Sea, Agigea, on Ceramium sp., 26 September 1968, Mack-Fira (coll. SMNH; type locality).

Material examined: Two individuals from Agigea (mounted on the same slide: SMNH, no. 47474). One of them designated neotype.

Diagnosis: Trigonostomum species with copulatory organ 72–74 Mm long. Stylet 83–84 Mm long, proximally bent over, 180∞. Mantle with two pointed plates (as long as the stylet) surrounds only the distal part of the stylet. Bursal appendage 66 Mm long, proximally with a barrel-like casing and ± ten distal tubules.

Remarks: The synonymization of Proxenetes lictor with T. mirabile was made by Ax (1959), but it was already recognized by Beklemischev in a personal note on the offprints of his article (see Ax, 1959).

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).