APPENDIX 1.
Measurements of Retropluma spp. used for construction of graph shown in Figure 7.
| taxon | repository number | locality | reference | carapace max. length (including rostrum) in mm | carapace max. width in mm | carapace width/carapace length |
| Retropluma slovenica | RGA/SMNH 173 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 4.6 | 5.2 | 1.13 |
| Retropluma slovenica | RGA/SMNH 267 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 11.1 | 13.2 | 1.19 |
| Retropluma slovenica | RGA/SMNH 270 and 290 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 13.2 | 16.8 | 1.27 |
| Retropluma slovenica | RGA/SMNH 318 and 319 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 15.0 | 16.6 | 1.11 |
| Retropluma slovenica | RGA/SMNH 320 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 13.6 | 16.8 | 1.24 |
| Retropluma slovenica | RGA/SMNH 554 and 559 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 11.3 | 15.2 | 1.35 |
| Retropluma slovenica | RGA/SMNH 555 and 556 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 14.7 | 17.0 | 1.16 |
| Retropluma slovenica | RGA/SMNH 558 and 553 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 12.2 | 13.9 | 1.14 |
| Retropluma slovenica | RGA/SMNH 642 and 619 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 10.6 | 12.0 | 1.13 |
| Retropluma slovenica | RGA/SMNH 656 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 6.2 | 7.4 | 1.19 |
| Retropluma slovenica | RGA/SMNH 657 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 5.3 | 7.4 | 1.40 |
| Retropluma slovenica | RGA/SMNH 658 and 659 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 13.2 | 15.6 | 1.18 |
| Retropluma slovenica | RGA/SMNH 662 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 11.6 | 14.2 | 1.22 |
| Retropluma slovenica | RGA/SMNH 663 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 10.7 | 13.8 | 1.29 |
| Retropluma slovenica | RGA/SMNH 673 and 674 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 13.2 | 17.0 | 1.29 |
| Retropluma slovenica | RGA/SMNH 705 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 13.8 | 16.3 | 1.18 |
| Retropluma slovenica | RGA/SMNH 707 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 17.9 | 19.5 | 1.09 |
| Retropluma slovenica | RGA/SMNH 710 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 12.0 | 13.3 | 1.11 |
| Retropluma slovenica | RGA/SMNH 724 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 8.2 | 10.3 | 1.26 |
| Retropluma slovenica | RGA/SMNH 735 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 14.0 | 17.1 | 1.22 |
| Retropluma slovenica | RGA/SMNH 1142 and 1143 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 7.8 | 10.6 | 1.36 |
| Retropluma slovenica | RGA/SMNH 1203 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 9.3 | 11.1 | 1.19 |
| Retropluma slovenica | RGA/SMNH 1208 and 1207 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 5.9 | 7.2 | 1.22 |
| Retropluma slovenica | RGA/SMNH 1216 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 5.7 | 6.4 | 1.12 |
| Retropluma slovenica | RGA/SMNH 139 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 8.3 | 10.7 | 1.29 |
| Retropluma slovenica | RGA/SMNH 145 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 9.2 | 11.1 | 1.21 |
| Retropluma slovenica | RGA/SMNH 275 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 9.9 | 11.6 | 1.17 |
| Retropluma slovenica | RGA/SMNH 287 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 8.3 | 10.0 | 1.20 |
| Retropluma slovenica | RGA/SMNH 322 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 11.8 | 15.3 | 1.30 |
| Retropluma slovenica | RGA/SMNH 548 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 11.4 | 14.8 | 1.30 |
| Retropluma slovenica | RGA/SMNH 549 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 4.5 | 6.1 | 1.36 |
| Retropluma slovenica | RGA/SMNH 557 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 7.6 | 10.3 | 1.36 |
| Retropluma slovenica | RGA/SMNH 561 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 9.3 | 11.3 | 1.22 |
| Retropluma slovenica | RGA/SMNH 564 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 8.3 | 10.1 | 1.22 |
| Retropluma slovenica | RGA/SMNH 631 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 9.1 | 13.4 | 1.47 |
| Retropluma slovenica | RGA/SMNH 633 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 9.2 | 13.5 | 1.47 |
| Retropluma slovenica | RGA/SMNH 641 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 9.5 | 12.6 | 1.33 |
| Retropluma slovenica | RGA/SMNH 646 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 6.6 | 7.2 | 1.09 |
| Retropluma slovenica | RGA/SMNH 655 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 7.4 | 8.7 | 1.18 |
| Retropluma slovenica | RGA/SMNH 660 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 8.4 | 10.0 | 1.19 |
| Retropluma slovenica | RGA/SMNH 664 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 4.4 | 5.3 | 1.20 |
| Retropluma slovenica | RGA/SMNH 672 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 7.5 | 9.5 | 1.27 |
| Retropluma slovenica | RGA/SMNH 725 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 11.0 | 13.4 | 1.22 |
| Retropluma slovenica | RGA/SMNH 732 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 16.3 | 18.7 | 1.15 |
| Retropluma slovenica | RGA/SMNH 886 and 887 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 10.9 | 13.2 | 1.21 |
| Retropluma slovenica | RGA/SMNH 890 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 7.4 | 9.9 | 1.34 |
| Retropluma slovenica | RGA/SMNH 1206 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 5.3 | 6.3 | 1.19 |
| Retropluma slovenica | RGA/SMNH 1209 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 10.6 | 14.2 | 1.34 |
| Retropluma slovenica | RGA/SMNH 1212 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 4.4 | 6.3 | 1.43 |
| Retropluma slovenica | RGA/SMNH 1213 | Činžat, Slovenia | Gašparič and Hyžný (2015) | 4.5 | 6.1 | 1.36 |
| Retropluma craverii | RGA/SMNH 1316 | Castellarano, Italy | De Angeli et al. (2011) | 19.0 | 22.0 | 1.16 |
| Retropluma craverii | RGA/SMNH 1315 | Castellarano, Italy | De Angeli et al. (2011) | 21.5 | 23.2 | 1.08 |
| Retropluma craverii | RGA/SMNH 1313 | Castellarano, Italy | De Angeli et al. (2011) | 24.4 | 25.1 | 1.03 |
| Retropluma craverii | RGA/SMNH 1317 | Castellarano, Italy | De Angeli et al. (2011) | 10.1 | 12.1 | 1.20 |
| Retropluma eocenica | MCZ 1467 | Nogarole Vincentino, Italy | Beschin et al. (1996) | 8.4 | 10.5 | 1.25 |
| Retropluma eocenica | MCZ 1469 | Nogarole Vincentino, Italy | Beschin et al. (1996) | 8.8 | 11.4 | 1.30 |
| Retropluma eocenica | MCZ 1470 | Nogarole Vincentino, Italy | Beschin et al. (1996) | 9.1 | 13.5 | 1.48 |
| Retropluma eocenica | MCZ 1474 | Arzignano, Italy | Beschin et al. (1996) | 10.0 | 14.0 | 1.40 |
| Retropluma eocenica | MCZ 1473 | Nogarole Vincentino, Italy | Beschin et al. (1996) | 11.2 | 14.2 | 1.27 |
| Retropluma eocenica | MCZ 1471 | Nogarole Vincentino, Italy | Beschin et al. (1996) | 11.1 | 14.6 | 1.32 |
| Retropluma eocenica | MCZ 1478 | Nogarole Vincentino, Italy | Beschin et al. (1996) | 12.5 | 16.6 | 1.33 |
| Retropluma cf. eocenica | MSNMi26238 | Ponzone, Italy | Larghi (2003) | 6.4 | 8.8 | 1.38 |
| Retropluma borealis | MSM 1577 | Gram, Denmark | Fraaije et al. (2005) | 12.9 | 17.0 | 1.32 |
| Retropluma borealis | MSM 1454 | Gram, Denmark | Fraaije et al. (2005) | 11.9 | 15.8 | 1.33 |
| Retropluma borealis | MSM 1580 | Gram, Denmark | Fraaije et al. (2005) | 8.1 | 10.8 | 1.34 |
| Retropluma borealis | MSM 1581 | Gram, Denmark | Fraaije et al. (2005) | 10.3 | 11.9 | 1.15 |
| Retropluma borealis | MSM 1582 | Gram, Denmark | Fraaije et al. (2005) | 11.0 | 14.4 | 1.31 |
| Retropluma borealis | MSM 1593/1 | Gram, Denmark | Fraaije et al. (2005) | 10.4 | 12.4 | 1.20 |
| Retropluma borealis | MSM 1593/5 | Gram, Denmark | Fraaije et al. (2005) | 7.9 | 10.0 | 1.26 |
| Retropluma borealis | MSM 1593/8 | Gram, Denmark | Fraaije et al. (2005) | 9.0 | 11.9 | 1.32 |
| Retropluma borealis | MSM 1593/10 | Gram, Denmark | Fraaije et al. (2005) | 7.1 | 9.1 | 1.29 |
| Retropluma slovenica | RGA/SMNH 1500 and 1501 | Kamnik/Rakovnik, Slovenia | Gašparič and Križnar (2017) | 14.5 | 18.4 | 1.27 |
| Retropluma slovenica | RGA/SMNH 1502 and 1503 | Kamnik/Rakovnik, Slovenia | Gašparič and Križnar (2017) | 10.9 | 13.4 | 1.23 |
| Retropluma slovenica | RGA/SMNH 1504 and 1505 | Kamnik/Rakovnik, Slovenia | Gašparič and Križnar (2017) | 17.8 | 20.3 | 1.14 |
| Retropluma minuta | PS-2 | Tušanj, Bosnia and Herzegovina | this paper | 3.9 | 3.8 | 0.97 |
| Retropluma minuta | PS-3 | Tušanj, Bosnia and Herzegovina | this paper | 4.1 | 4.0 | 0.98 |
| Retropluma minuta | PS-4 | Tušanj, Bosnia and Herzegovina | this paper | 3.9 | 3.7 | 0.95 |
| Retropluma minuta | PS-5 | Tušanj, Bosnia and Herzegovina | this paper | 6.7 | 6.9 | 1.03 |
| Retropluma minuta | PS-6 | Tušanj, Bosnia and Herzegovina | this paper | 6.1 | 6.1 | 1.00 |
| Retropluma minuta | PS-7 | Tušanj, Bosnia and Herzegovina | this paper | 7.2 | 7.4 | 1.03 |
