Mts, Spallanzani, 1726

Ichalczyk, Ukasz & Aczmarek, Ukasz, 2003, Water Bears (Tardigrada) of the Bieszczady Mountains (Poland, West Carpathians), Zootaxa 242 (1), pp. 1-24 : 19-22

Key to species known from The Bieszczady Mts .

1. Dorsal side of body covered with cuticular plates, lateral cirrus A present ................. 2

­ Dorsal side of body without plates, lateral cirrus A absent .......................................... 5

2. Pseudosegmental plate present ................... Pseudechiniscus suillus (Ehrenberg, 1853)

­ Pseudosegmental plate absent ..................................................................................... 3

3. Lacking any lateral and dorsal appendages other than cirrus A, dorsal plates covered by circular or hexagonal pattern ........................... Echiniscus reticulatus Murray, 1905

­ There are other lateral or dorsal appendages, dorsal plates with small pores or granules ..................................................................................................................................... 4

4. Filamentosus appendages present in positions: A, C, Cd, D and spine is present in position Dd ................................................................... Echiniscus trisetosus Cuénot, 1932

­ Filamentosus appendages present in positions: A, C, D and E, in position Cd and Dd filaments or spines are present ................................. Echiniscus merokensis Richters, 1904

5. Two cephalic papillae present ............................ Milnesium tardigradum Doyére, 1840

­ Cephalic papillae absent............................................................................................... 6

6. Claws symmetrical; external and internal claw identically developed (the same in size and shape)..................................................................................................................... 7

­ Claws different ........................................................................................................... 13

7. Claws of hufelandi type ............................................................................................... 8

­ Claws of pullari type ............................................. Murrayon hibernicus Murray, 1911

8. Peribuccal lamellae present, peribuccal papulae absent, stylet supports inserted more than 73 % of buccal tube length, buccal tube wide (>12 % of buccal tube length)..... 9

­ Peribuccal lamellae absent, peribuccal papulae present, stylet supports inserted at 54% of the buccal tube length, buccal tube narrow (6.8% or less of buccal tube length)....... ............................................................................. Minibiotus intermedius (Plate, 1888)

9. Pharynx with 2 macroplacoids ................................................................................... 10

­ Pharynx with 3 macroplacoids .................................................................................. 12

10. Lunules of IV pair of leg dentate, eggs with conical processes, surface between processes smooth ................................................... Macrobiotus crenulatus Richters, 1904

­ Lunules of IV pair of leg smooth, eggs with mushroom­shaped processes, surface between processes with ornamentation ..................................................................... 11

11. Margin of dishes of processes smooth, base of processes surrounded by ring of pits ... ................................................... Macrobiotus macrocalix Bertolani & Rebecchi, 1993

­ Margin of dishes of processes with small regular teeth, surface between processes covered by reticular pattern ..................................... Macrobiotus hufelandi Schultze, 1833

12. Cuticle without pores, eyes present, lunules smooth, eggs white with processes in the shape of cones covered by fine reticular pattern, surface between cones smooth or with fine punctation ................................................. Macrobiotus harmsworthi Murray, 1907

­ Cuticle with small pores, eyes almost always absent, lunules smooth or little crenate, eggs white, processes in shape of flattened cones covered by reticular design, surface between cones with areolation .............................. Macrobiotus richtersi Murray, 1911

13. Claws of Calohypsibius type, very small (less then 5 µm long) ............................... 14

­ Claws different .......................................................................................................... 15

14. Dorsal side of the body covered by 8 transversal bands with spines .............................. .......................................................................... Calohypsibius ornatus (Richters, 1900)

­ Dorsal side of the body covered by star­like tubercles ................................................... ..................................................... Calohypsibius schusteri Nelson & McGlothlin, 1996

15. Claws of Hypsibius type ............................................................................................ 16

­ Claws different ............................................................................................................ 25

16. Buccal tube rigid (lack of pharyngeal tube with spiral thickenings).......................... 17

­ Buccal tube divided into a rigid anterior part (buccal tube) and a flexible posterior part (pharyngeal tube) with spiral thickenings ................................................................. 20

17. Microplacoid or septula present ................................................................................. 18

­ Microplacoid and septula absent ................................................................................ 19

18. Microplacoid present ............................................... Hypsibius sp. (‘ convergens group’)

­ Septula present ....................................................... Hypsibius dujardini (Doyére, 1840)

19. Macroplacoids rod­shaped, clearly longer then wide, I macroplacoid with constriction in the middle, small transversal bar on IV pair of legs present, eyes usually absent ...... ....................................................................... Hypsibius convergens Urbanowicz, 1925

­ Macroplacoids rounded or granular, I macroplacoid without constriction, small transversal bar on IV pair of legs absent, large eyes present .................................................. ....................................................................................... Hypsibius pallidus Thulin, 1911

20. Pharynx with one very slender macroplacoid ....... Astatumen bartosi Węglarska, 1959

­ Pharynx with more than one macroplacoid ............................................................... 21

21. Apophyses for insertion of stylet muscles in the shape of a wide, flat ridge .................. ...................................................................... Mesocrista spitsbergense (Richters, 1903)

­ Apophyses for insertion of stylet muscles in the shape of a semilunar hook............ 22

22. Drop­like structure between buccal and pharyngeal tube present.............................. 23

­ Drop­like structure between buccal and pharyngeal tube absent............................... 24

23. Pharynx with 3 macroplacoids, microplacoid and septula; cuticle smooth, eyes absent ............................................................. Diphascon (Diphascon) pingue (Marcus, 1936)

­ Pharynx with 2 macroplacoids and septula; cuticle with fine granulation on the caudal part of the body, eyes present ............. Diphascon (Diphascon) oculatum Murray, 1906

24. Pharynx with 3 macroplacoids increasing in length from 1 st to 3 rd, microplacoid and septula absent ...................................... Diphascon (Adropion) prosirostre Thulin, 1928

­ Pharynx with 3 macroplacoids (the 2 nd the shortest) and microplacoid ......................... ............................................................... Diphascon (Adropion) scoticum Murray, 1905

25. Claws of Isohypsibius type ........................................................................................ 26

­ Claws of Ramazzottius type ....................... Ramazzottius oberhaeuseri (Doyére, 1840)

26. Cuticle without gibbosities......................................................................................... 27

­ Cuticle with gibbosities ............................................................................................. 28

27. Pharynx with 3 macroplacoids increasing in length from 1 st to 3 rd, microplacoid absent (or very small); mouth opening ventral, cuticular bars on legs absent ........................... ......................................................................... Isohypsibius schaudinni (Richters, 1909)

­ Pharynx with 3 macroplacoids (1 st and 2 nd equal in length, 3 rd slightly longer) and microplacoid; mouth opening terminal, cuticular bars on legs present........................... .......................................................................... Isohypsibius prosostomus Thulin, 1928

28. Gibbosities in the caudal part of the body conical with short, tiny spines...................... .............................................................................. Isohypsibius sattleri (Richters, 1902)

­ Gibbosities in the caudal part of the body without spines ......................................... 29

29. Dorsal side of the body with 8 rows of gibbosities: 1 st, 3 rd, 5 th, 7 th, 8 th row with 2 gibbosities, 2 nd, 4 th, 6 th with 3 .................. Isohypsibius ronsisvallei (Binda & Pilato, 1969)

­ Dorsal side of the body with 10 rows of gibbosities: 3 rd, 5 th, 7 th row with 6 gibbosities; 2 nd, 4 th, 6 th, 8 th, 9 th with 4; 1 st, 10 th with 2 .................. Isohypsibius pappi (Iharos, 1966)