Abstract
A study was performed on freshwater gastrotrichs living in the interstitial habitat of some lakes in Latium and of Lake Garda (Italy). Thirty-two chetonotids were collected, twenty-five of which could be identified. Four are new to science (Chaetonotus (Hystricochaetonotus) benacensis, Heterolepidoderma lamellatum, Ichthydium plicatum, I. squamigerum), and two are new to the Italian fauna (Heterolepidoderma macrops, H. majus). The faunistic composition of the lakes is compared with previous data. Interstitial gastrotrichs are less varied and abundant than those of epibenthos and periphyton, but often are of taxonomical and zoogeographical interest. The presence in the interstitial of some epibenthic and periphytic species demonstrates their capacity to colonize ecologically different habitats. The grain size of the substrate was not clearly correlated with faunal richness, but there was a possible influence of the amount of the organic detritus in the sediment. Morphological analysis showed a prevalence of small sized animals, with poorly ornamentated cuticular covering and well developed locomotory ciliature, as probable adaptations to interstitial life.
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Abbreviations
- b =:
-
dorsal sensory bristles
- d =:
-
dorsal
- dl =:
-
dorsolateral
- f =:
-
furca
- h =:
-
head
- n =:
-
neck
- L =:
-
length
- TL =:
-
total length
- lat =:
-
lateral
- ph =:
-
pharynx
- pl =:
-
ventral terminal plates
- v =:
-
ventral scale/s
- sp =:
-
spine/s
- spec =:
-
specimen/s
- tr =:
-
trunk
- v =:
-
ventral
- w =:
-
width
References
Balsamo, M., 1977. Prime ricerche sui Gastrotrichi dulciacquicoli italiani. Atti Soc. tosc. Sci. nat. Mem., ser. B 84: 87–150.
Balsamo, M., 1980. Secondo contributo alla conoscenza dei Gastrotrichi delle acque dolci italiane. Atti Soc. tosc. Sci. nat. Mem., ser. B 87: 94–126.
Balsamo, M., 1983. Gastrotrichi. Guide per il riconoscimento delle specie animali delle acque interne italiane. C.N.R. AQ/1/199, Vol. 20, Valdonega, Verona, 92 pp.
Balsamo, M., 1990. Gastrotrichs from Lakes Bolsena, Chiusi and Montepulciano (central Italy), with the description of four new species. Boll. Zool. 57: 165–178.
Balsamo, M. & E. Fregni, 1992. Habitat influences cuticular morphology of freshwater gastrotrichs. Proc. 8° Meeting I.A.M., College Park, USA: 43.
Balsamo, M. & J. Kisielewski, 1986. Chaetonotus fluviatilis, a new freshwater gastrotrich. Boll. Zool. 53: 111–114.
Balsamo, M. & M. A. Todaro, 1994. Gastrotrichi del Trentino: le Viotte del Monte Bondone (Trento). Studi trent. Sci. nat., Acta Biol. 69 (in press).
Bertolani, R. & M. Balsamo, 1989. Tardigradi e gastrotrichi del Trentino: il Lago di Tovel (Trento). Studi trent. Sci. nat., Acta Biol. 65: 83–93.
Bonomi, G. & D. Ruggiu, 1971. Popolamenti bentonici profondi. In Istituto Italiano Idrobiologia Pallanza (ed.), Limnologia ed ecologia dei laghi di Bolsena, Bracciano, Trasimeno e Vico: situazione attuale e prevedibili conseguenze derivanti da una loro utilizzazione multipla. Edizioni Xerografiche Vercellini, Verbania, Pallanza: 227–244.
Delamare-Deboutteville, C., 1960. Biologie des eaux souterraines littorales et continentales. Hermann, Paris, 740 pp.
Evans, W. A., 1982. Abundance of micrometazoans in three sandy beaches in the island area of western Lake Erie. Ohio J. Sci. 82: 246–251.
Ferrari, I., 1971. I popolamenti zooplanctonici. In Istituto Italiano Idrobiologia Pallanza (ed.), Limnologia ed ecologia dei laghi di Bolsena, Bracciano, Trasimeno e Vico: situazione attuale e prevedibili conseguenze derivanti da una loro utilizzazione multipla. Edizioni Xerografiche Vercellini, Verbania, Pallanza: 186–193.
Higgins, R. & H. Thiel, 1988. Introduction to the study of meiofauna. Smithsonian Institution Press, Washington, 488 pp.
d'Hondt, J. L., 1967. Documents sur les Gastrotriches dulcicoles des eaux françaises. Ann. Limnol. 3: 381–397.
Hummon, W. D., 1987. Meiobenthos of the Mississipi headwaters. In R. Bertolani (ed.), Biology of Tardigrades. Selected Symposia and Monographs U.Z.I. 1, Mucchi, Modena, Italy: 125–140.
Istituto Italiano di Idrobiologia Pallanza, 1971. Limnologia e ecologia dei laghi di Bolsena, Bracciano, Trasimeno e Vico: situazione attuale e prevedibili conseguenze derivanti da una loro utilizzazione multipla. Edizioni Xerografiche Vercellini, Verbania, Pallanza, 263 pp.
Kisielewska, G., 1982. Gastrotricha of two complexes of peat hags near Siedlce. Fragm. faun. Warszawa 27:39–57.
Kisielewska, G. & J. Kisielewski, 1986. Freshwater Gastrotricha of Poland. II. Gastrotricha from the seaside lakes in the Slowinski National Park. Fragm. faun. Warszawa 30: 183–194.
Kisielewski, J., 1981. Gastrotricha from raised and transitional peat bogs in Poland. Monogr. Fanny Polski 11: 1–143.
Kisielewski, J., 1987. Two new interesting genera of Gastrotricha (Macrodasyida and Chaetonotida) from the Brazilian freshwater psammon. Hydrobiologia 153: 23–30.
Kisielewski, J., 1990. Origin and phylogenetic significance of freshwater psammic Gastrotricha. Stygologia 5: 87–92.
Kisielewski, J., 1991. Inland-water Gastrotricha from Brazil. Ann. Zool. 43, suppl. 2: 1–168.
Kisielewski, J. & G. Kiesielewska, 1986. Freshwater Gastrotricha of Poland. I. Gastrotricha from the Tatra and Karkonosze Mountains. Fragm. faun. Warszawa 30: 157–183.
Mola, P., 1932. Gastrotricha delle acque dolci italiane. Int. Revue Hydrobiol. Hydrogr. 26: 397–423.
Nesteruk, T., 1986. Freshwater Gastrotricha of Poland. IV: Gastrotricha of fish ponds in the vicinity of Siedlce. Fragm faun. Warszawa 30: 215–233.
Nocentini, A. M., 1971. Popolamenti bentonici litorali e sublitorali. In Istituto Italiano Idrobiologia Pallanza (ed.), Limnologia ed ecologia dei laghi di Bolsena, Bracciano, Trasimeno e Vico: situazione attuale e prevedibili conseguenze derivanti da una loro utilizzazione multipla. Edizioni Xerografiche Vercellini, Verbania, Pallanza: 186–193.
Preobrajenskaia, E. N., 1926. Zur Verbreitung der Gastrotrichen in den Gewässern der Umgebung zu Kossino. Arb. Biol. St. Kossino 4: 3–14.
Robbins, C. E., 1973. Gastrotricha from Illinois. Trans. III. Acad. Sci. 66: 124–126.
Roszczak, R., 1969. Brzuchorzeski (Gastrotricha) Srodkowei Wielkopolski. Pr. Kom. biol. Pozn. TPN, Poznán 32: 1–92.
Ruttner-Kolisko, A., 1955. Rheomorpha neiswestnovae und Marinellina ftagellata, zwei phylogenetisch interessante Wurmtypen aus dem Süsswasserpsammon. Osterr. zool. Z. 6: 33–69.
Saito, I., 1937. Neue und bekannte Gastrotrichen der Umgebung von Hiroshima (Japan). J. Sci. Hiroshima Univ., ser. B, 1: 245–265.
Schwank, P., 1990. Gastrotricha. In A. Brauer (ed.), Süsswasserfauna von Mitteleuropa. G. Fischer Verlag, Stuttgart, New York 13/1: 1–252.
Stokes, C. A., 1887. Observations on Chaetonotus. Microscope 7: 33–43.
Strayer, D., 1985. The benthic micrometazoans of Mirror Lake, New Hampshire. New Hampshire Arch. Hydrobiol. Suppl. 72: 287–426.
Todaro, M. A., 1992. Contribution to the study of the Mediterranean meiofauna: Gastrotricha from the Island of Ponza, Italy. Boll. Zool. 59: 321–333.
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Balsamo, M., Fregni, E. Gastrotrichs from interstitial fresh water, with a description of four new species. Hydrobiologia 302, 163–175 (1995). https://doi.org/10.1007/BF00027040
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DOI: https://doi.org/10.1007/BF00027040