Ichthydium tanytrichum Balsamo, 1982

Kånneby, Tobias, Todaro, Antonio & Jondelius, Ulf, 2009, One new species and records of Ichthydium Ehrenberg, 1830 (Gastrotricha: Chaetonotida) from Sweden with a key to the genus, Zootaxa 2278, pp. 26-46 : 32

publication ID	https://doi.org/10.5281/zenodo.191157
DOI	https://doi.org/10.5281/zenodo.5627843
persistent identifier	https://treatment.plazi.org/id/03834469-FFB2-031A-FF02-FBE3F53DF993
treatment provided by	Plazi (2016-04-20 03:53:28, last updated 2024-11-27 18:18:06)
scientific name	Ichthydium tanytrichum Balsamo, 1982
status

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Ichthydium tanytrichum Balsamo, 1982 View in CoL

( Figures 7A, B View FIGURE 7. A – D ; Table 4)

Localities: Ånnsjön, Jämtland, Sweden (63º15.637’N; 12º27.090’E).

Material: 1 specimen.

Remarks: Ichthydium tanytrichum is short and plump with a long tong-shaped furca. The Swedish specimen was an adult specimen of 126 µm in total body length and agrees well with descriptions provided by Balsamo (1982). The bi-keeled scales anchoring the posterior bristles as well as the large rectangular ventral terminal scales and the four pairs of long ventral ciliary tufts in the trunk region were clearly visible. Balsamo (1982) reports a total body length of only 74–76 µm for I. tanytrichum . In our opinion the specimens found by Balsamo (1982) were probably sub-adults based on the fact that the original drawing of this species was depicted without an egg, and most important the length of the pharynx is proportionally too long compared to total body length, a trait that is typical for sub-adult animals. PhIJ at U27; ASB at U18; PSB at U71.

Associated gastrotrich fauna: Aspidiophorus tetrachaetus Kisielewski, 1986 , Chaetonotus armatus Kisielewski, 1981 , C. heideri Brehm, 1917 and C. polyspinosus Greuter, 1917 .

References

Balsamo, M. (1982) Three new gastrotrichs from a Tuscan-Emilian Apennine lake. Bollettino di Zoologia, 49, 287 - 295 (1983).

Brehm, V. (1917) Ergebnisse einiger im Franzensbader Moor unternommener Exkursionen. Archiv fur Hydrobiologie, 11, 306 - 323.

Greuter, A. (1917) Beitrage zur Systematik der Gastrotrichen in der Schweiz. Revue Suisse de Zoologie, 25, 35 - 76.

Kisielewski, J. (1981) Gastrotricha from raised and transitional peat bogs in Poland. Monografie Fauny Polski, 11. Polska Akademia Nauk, Warszawa, 143 pp.

Kisielewski, J. (1986) Taxonomic notes on freshwater gastrotrichs of the genus Aspidiophorus Voigt (Gastrotricha, Chaetonotoidea) with description of four new species. Fragmenta Faunistica, 30, 139 - 156.

Figures

FIGURE 7. A – D) Subgenus Forficulichthys continued; E) Subgenus Pseudichthydium; F – H) Incertae sedis. A) Ichthydium tanytrichum dorsal and B) ventral view. C) I. skandicum n. sp. dorsal and D) ventral view. E) I. balatonicum dorsal view. F) I. chaetiferum ventral view. G) I. cyclocephalum dorsal and H) ventral view. A – D, original; E, modified from Schwank (1990); F, modified from Kisielewski (1991); G, H, modified from Grünspan (1908). Scale bars: 20 µm.