Abstract
The pattern of Asellus aquaticus (L.) distribution is presented with lists of its hypogean populations. Of the races with small area on pleopods IV–V only an E Romanian population is homogeneously depigmented and blind. A characteristic group of races with enlarged pleopod areae is seen only in the Dinarides. Of these, the most troglomorphic race is A. a. cavernicolus Racovitza, in the hypogean parts of Pivka (SW Slovenia) and Reka-Timavo (NE Italy) systems. A secondary introgression with A. a. aquaticus in Postojna Caves has been observed. Some phylogenetic relationships are discussed based on morphological, hydrographical and paleogeographical data. A comparison with the endemic Proasellus istrianus (Stammer) is given, which lives on the surface in the Adriatic drainage basin only, but exhibits also a hypogean range beyond which it is similar to that of A. a. cavernicolus.
Izvleček
Predstavljen je vzorec razširjenosti oslička Asellus aquaticus (L.) s seznamom podzemeljskih populacij. Od ras z majhnimi areami na IV–V pleopodih je enotno nepigmentirana in slepa le neka vzhodno romunska populacija. Le iz Dinarskega sistema poznamo značilno skupino ras s povečano areo na pleopodih. Njihova najbolj troglomorfna rasa je A. a. cavernicolus Racovitza v podzemeljskem povodju Pivke (JZ Slovenia) in Reke (SV Italija). Ugotovljeno je sekundarno mešanje z A. a. aquaticus v Postojnskih jamah. Na osnovi morfoloških, hidrografskih in paleogeografskih podatkov so obravnavani nekateri filogenetski odnosi. Podana je primerjava z endemnim Proasellus istrianus (Stammer), ki čivi na površju le v jadranskem povodju, ima pa tudi podzemeljski areal, ki tega presega, in je podoben podvrsti A. a. cavernicolus.
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Presented at the Symposium on the ‘Biogeography of Subterranean Crustaceans: the Effects of Different Scales’ (June 1992; Charleston, South Carolina, U.S.A.) Manuscript prepared for print by D.C. Culver.
Presented at the Symposium on the ‘Biogeography of Subterranean Crustaceans: the Effects of Different Scales’ (June 1992; Charleston, South Carolina, U.S.A.) Manuscript prepared for print by D.C. Culver.
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Sket, B. Distribution of Asellus aquaticus (Crustacea: Isopoda: Asellidae) and its hypogean populations at different geographic scales, with a note on Proasellus istrianus . Hydrobiologia 287, 39–47 (1994). https://doi.org/10.1007/BF00006895
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DOI: https://doi.org/10.1007/BF00006895