caa a22 4500 386384665 CHVBK 20180307112054.0 cr unu---uuuuu 161130s1989 xx s 000 0 eng 10.1017/S0263593300028741 doi S0263593300028741 pii (NATIONALLICENCE)cambridge-10.1017/S0263593300028741 Palaeophysiology of terrestrialisation in the Chelicerata [Elektronische Daten] The wide range of organs of respiration (book-gills, book-lungs, sieve- and tube-tracheae), reproduction, sensory perception, etc., among the chelicerates indicates that the major groups made the transition to land life independently. The fossil record is patchy for most chelicerate groups, certain intervals (e.g. Westphalian) being particularly rich in chelicerate bearing Lagerstatten while in others (e.g. Mesozoic) they are sparse. Due, apparently, to their unusual hyaline exocuticle, scorpions are better preserved than other arthropods, and show a fairly continuous record from fully aquatic forms in the Silurian, to both aquatic and terrestrial faunas in the Carboniferous. In particular, new and well-preserved material of the earliest demonstrably terrestrial scorpions from the Lower Carboniferous of East Kirkton, West Lothian, suggests that book-lungs, at least in the scorpions, developed directly from book-gills by suturing of the covering plate (Blattfuss of the related eurypterids) to leave stigmata for diffusion of air. This evidence supports the ideas of early authors that the scorpion mesosomal ‘sternites' are fused plates, contra Kjellesvig-Waering (1986) who envisaged the plates being lost to reveal true sternites beneath. The fossil evidence also indicates that by the Triassic at least two scorpion lineages had evolved intra-‘sternite' stigmata. Copyright © Royal Society of Edinburgh 1989 Arachnida nationallicence arthropod nationallicence autecology nationallicence cuticle nationallicence Palaeozoic nationallicence respiration nationallicence Selden Paul A. Department of Extra-Mural Studies, University of Manchester, Manchester M13 9PL, U.K. Jeram Andrew J. Department of Geology, University of Manchester, Manchester M13 9PL, U.K. Transactions of the Royal Society of Edinburgh: Earth Sciences Royal Society of Edinburgh Scotland Foundation 80/3-4(1989), 303-310 0263-5933 80:3-4<303 1989 80 TRE https://doi.org/10.1017/S0263593300028741 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0263593300028741 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Selden Paul A. Department of Extra-Mural Studies, University of Manchester, Manchester M13 9PL, U.K NATIONALLICENCE 700 1- Jeram Andrew J. Department of Geology, University of Manchester, Manchester M13 9PL, U.K NATIONALLICENCE 773 0- Transactions of the Royal Society of Edinburgh: Earth Sciences Royal Society of Edinburgh Scotland Foundation 80/3-4(1989), 303-310 0263-5933 80:3-4<303 1989 80 TRE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge