Table S1.
The 20 fossils examined in this study
| Specimen | Specimen ID | Elements preserved | Specimen location | Notes on specimen | Locality of origin | Scanned where and by whom | kV | µA | Voxel size (mm) | Rotation step (o) | Exposure (ms) |
| A | AMNH DR SH 1 | Whole body | American Museum of Natural History, New York | Curator David Grimaldi | Dominican Republic | Harvard Centre for Nanoscale Systems Material Synthesis Facility (CNS); Emma Sherratt (ES) & Jasmine Casart | 70 | 120 | 0.0267 | 0.11 | 1,000 |
| B | I | Whole body | Private collection | Owned by Marilyn Halonen and Michael Cusanovich of Tuscon, Arizona | Dominican Republic | CNS; D. Luke Mahler | 55 | 185 | 0.0452 | 0.25 | — |
| C | II | Whole body | Private collection | Owned by Jim Work of Central Point, Oregon | Dominican Republic | CNS; ES | 65 | 195 | 0.0609 | 0.11 | 1,000 |
| D | III | Whole body | Private collection | Jose Calbeto of Guaynabo, Puerto Rico | Dominican Republic | CNS; ES | 55 | 165 | 0.0149 | 0.11 | 1,415 |
| E | M-1062 | Part (hindlimbs and tail) | Private collection | Owned by Ettore Morone of Torino, Italy | Dominican Republic | Imaging and Analysis Centre, Natural History Museum London (IAC-NHM); ES & Russell Garwood (RG) | 105 | 195 | 0.0107 | 0.06 | 354 |
| F | M-1153 | Whole body | Private collection | Owned by Ettore Morone of Torino, Italy | Dominican Republic | IAC-NHM; ES & RG | 105 | 195 | 0.0135 | 0.06 | 354 |
| G | M-3410 | Whole body | Private collection | Owned by Ettore Morone of Torino, Italy | Dominican Republic | IAC-NHM; ES & RG | 105 | 195 | 0.0330 | 0.06 | 354 |
| H | M-525 | Whole body | Private collection | Owned by Ettore Morone of Torino, Italy | Dominican Republic | IAC-NHM; ES & RG | 105 | 195 | 0.0210 | 0.06 | 500 |
| I | NMBA Entom P52 | Whole body | Naturhistorisches Museum, Basal Switzerland | Obtained by C. Baroni-Urbani, NMBA, Basel | La Toca mine, Cordillera Septentrional, Dominican Republic | Synchrotron Radiation Facility (ESRF) in Grenoble, France, Renaud Boistel & Anthony Herrel | — | — | 0.00746 | — | — |
| J | OAAAA | Whole body | Private collection | Supplied by Marco Greco (Ambras Greco SAS) of Milan, Italy | Dominican Republic | CNS; ES | 75 | 130 | 0.0237 | 0.11 | 1,000 |
| K | SMNS Do-4871-M | Part (head) | Staatliches Museum für Naturkunde Stuttgart, Germany | Donated by Georg Dommel of Düsseldorf, Germany in 1985 | Dominican Republic | CNS; ES | 50 | 140 | 0.0077 | 0.11 | 1,415 |
| L | SMNS Do-4886-B | Part (tail, hindlimb) | Staatliches Museum für Naturkunde Stuttgart, Germany | Purchased in 1985 from Erich Beyna, Santo Domingo, Dominican Republic | Dominican Republic | CNS; ES | 50 | 180 | 0.0124 | 0.11 | 1,000 |
| M | SMNS Do-5566-X | Part (trunk, forelimb, hindlimbs) | Staatliches Museum für Naturkunde Stuttgart, Germany | Purchased 1991 from D. M. Salem, 8950 Sunrise Lake Blvd. 80/311, Sunrise, FL 33322, USA | Dominican Republic | CNS; ES | 50 | 130 | 0.0256 | 0.11 | 1,415 |
| N | SMU 74976 | Part (head) | Shuler Museum of Paleontology, South Methodist University, Dallas TX | Donated by William S. Lowe of Granbury Texas | Dominican Republic | University of Texas High-Resolution X-ray CT Facility, Rich Ketcham | 80 | 200 | 0.0680 | 0.13 | — |
| O | USNM 580060 | Part (head, forelimb) | Smithsonian Institution National Museum of Natural History, Washinton DC | Purchased from Amberica West | La Toca mine, Cordillera Septentrional, Dominican Republic | University of Texas High-Resolution X-ray CT Facility, Matthew Colbert | 180 | 133 | 0.0127 | 0.23 | — |
| “ | “ | “ | “ | “ | “ | CNS; ES | 60 | 165 | 0.0051 | 0.18 | 1,000 |
| P | M-2096 | Part (trunk and forelimbs) | Private collection | Owned by Ettore Morone of Torino, Italy | Dominican Republic | IAC-NHM; ES & RG | 105 | 195 | 0.0168 | 0.06 | 354 |
| Q | RAAA | Part (forelimbs) | Private collection | Supplied by Marco Greco (Ambras Greco SAS) of Milan, Italy | Dominican Republic | CNS; ES | 75 | 130 | 0.0089 | 0.11 | 1,000 |
| R | M-3016 | Part (forelimb, torso) | Private collection | Owned by Ettore Morone of Torino, Italy | Dominican Republic | IAC-NHM; ES & RG | 105 | 195 | 0.0092 | 0.06 | 354 |
| S | M-1273 | Part (forelimbs) | Private collection | Owned by Ettore Morone of Torino, Italy | Dominican Republic | IAC-NHM; ES & RG | 105 | 195 | 0.0068 | 0.06 | 354 |
| T | SMNS Do-5742 | Part (body, no head) | Staatliches Museum für Naturkunde Stuttgart, Germany | Donated by Georg Dommel of Düsseldorf, Germany in 1980 | Dominican Republic | CNS; ES | 50 | 165 | 0.0308 | 0.11 | 1,415 |
Information is provided on state of preservation (elements preserved); current location and locality of origin (including the mine, where known); and X-ray microcomputed tomography scan settings, with information on where the scan was done and by whom. Fossil O, originally scanned at University of Texas, was rescanned at Harvard at a higher resolution for this project (data from the higher resolution scan were used for the morphometric and phylogenetic analyses). Three fossils previously were published: A(18), I(15), and N(19).