Hydrobioid taxa found in the Kalkalpen National Park. Scale 0.5 mm. A: Dorsal (left) and ventral (right) view of Bythinella conica, individual ABOL_510_3 morphotype 1 from the spring KEHLS. B: Dorsal (left) and ventral (right) view of Bythinella conica individual ABOL_510_5 morphotype 2 from the spring KEHLS. C: Dorsal (left) and ventral (right) view of Belgrandiella aulaei individual ABOL_546_1 from the spring BRUN. D: Dorsal, ventral and lateral (left to right) view of Hauffenia kerschneri individual ABOL_512_1 from the spring SULZ 2. E: Dorsal, ventral and lateral (left to right) view of Hauffenia wienerwaldensis individual ABOL_517_1 from the spring KREMS. F: Dorsal (left) and ventral (right) view of one individual of Bythiospeum cf. nocki morphotype 2 from the spring REUT. G: Dorsal (left) and ventral (right) view of one individual of Bythiospeum cf. nocki morphotype 1 from the spring REUT.