Trigonostomum venenosum
- Dataset
- Revision of Trigonostomum Schmidt, 1852 (Platyhelminthes, Typhloplanoida, Trigonostomidae) with the description of seven new species
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Platyhelminthes
- class
- Rhabditophora
- order
- Rhabdocoela
- family
- Trigonostomidae
- genus
- Trigonostomum
- species
- Trigonostomum venenosum
description
(FIGS 1, 6 A)
diagnosis
Diagnosis: Trigonostomum species with copulatory organ 74 – 130 Mm long. Stylet 117 – 194 Mm long, proximally bent over 270 ∞. Mantle with one pointed plate, surrounds only the distal part of the stylet. Bursal appendage ± 54 Mm long, with a proximal ring and two distal tubes.
discussion
Remarks and additional data: The length of the stylet shows large variation between the populations of Banyuls (117 – 124 Mm; n = 2), Sardinia (148 – 156 Mm; n = 2), Corsica (165 – 179 Mm; n = 2) and Kerguelen (157 – 194 Mm; n = 3). The stylet resembles that of some species of Messoplana (e. g. M. elegans Luther, 1948; M. helgolandica Ax, 1971; M. pacifica Karling, 1986; M. rugata Ehlers, 1974).
distribution
Known distribution: Iceland (Steinböck, 1938), Ireland (Southern, 1912, 1936), Faeroe Islands (Steinböck, 1931), North Sea (Attems, 1897; Meixner, 1924 b, 1925), Mediterranean Sea (Graff, 1882; Meixner, 1926), Adriatic Sea (Meixner, 1926), Black Sea (Uljanin, 1870; Pereyaslawzewa, 1893; Graff, 1905; Ax, 1959; Mack-Fira & Cristea-Nastasesco, 1971; Mack-Fira, 1974). New localities: Sweden, Gullmarsfjord, Gåsövik, among algae, August 1945, Westblad (coll. SMNH). Norway, Bergen, Bay south of Tyssöy, stones, gravel, algae and fine shell-sand, 5 – 8 m depth, 29 July 1968, Karling (coll. SMNH). Norway, Bergen, sound between Leröy and Buröy; sand and mud, 5 m depth; 1 August 1968, Karling (coll. SMNH). France, Corsica, Port de la station Stareso, on algae, 6 – 4 m deep, 9 May 1982 and 12 March 1983, Martens; Bay of Calvi, 11 April 1984 and 26 March 1985. Italy, Sardinia, Porticello, about 0.2 – 1.5 m deep, on Vaucheria - like algae on rocks, 14 August 1994. France, Banyuls, Ile Gros, on green algae near the jetty behind the station, 22 – 23 June 2000. Kerguelen, Port Couvreux, bay at the right, green algae, 25 November 1992.
materials_examined
Material examined: Several specimens studied alive. Neotype (SMNH, no. 47499). Whole mounts from Sardinia (2), Corsica (4), Banyuls (3), Kerguelen (6), Norway (SMNH, nos. 47496 – 8) and Romania (SMNH, no. 47500 – 1). Two serially sectioned specimens (SMNH, nos. 47493 – 4) from Sweden.
Name
- Homonyms
- Trigonostomum venenosum