Table 1.
Morphometric data for all examined specimens of †Titanonarke Carvalho, 2010 from the Eocene Monte Postale site, Bolca Lagerstätte. Abbreviations (see the morphological scheme in the Supplemental material): AOW, antorbital cartilage width; CFL, caudalfin length; CFD, caudal fin depth; CLO, clasper length; CPD, caudal peduncle depth; D1B, first dorsal fin base length; D2B, second dorsal fin base length; DCS, dorsal caudal space; DL, disc length; DW, disc width; HL, head length; IDS, interdorsal space; MOW, mouth width; P2A, pelvic fin anterior margin length; P2B, pelvic fin base length; P2S, pelvic fin span; PCS, space from pelvic fin insertion to the caudal fin origin; PD1, predorsal distance up to the first dorsal fin; PD2, predorsal distance up to the second dorsal fin; PDI, pelvic fin insertion to first dorsal fin origin; PDO, pelvic fin origin to first dorsal fin origin; PGW, snout tip to the level of the greatest disc width; PIW, body width at pectoral fin insertions; POR, preoral length; PP2, prepelvic length; SL, standard length; TAL, tail length; TBW, tail base at pelvic fin origin; TL, total length.
| †Titanonarke molini (Jaekel, 1894) | †Titanonarke megapterygia sp. nov. | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MGP-PD 26275/6 |
MCSNV IG.VR.67290 |
MCSNV IG.91128/9 |
MCSNV IG.135581 |
MCSNV IG.VR.91359 |
MCSNV IG.135576 |
|||||||
| Measurements | mm | % SL | mm | % SL | mm | % SL | mm | % SL | mm | % SL | mm | % SL |
| AOW | 206.6 | 25.3 | 217.4 | 29.0 | 196.2 | 23.1 | 26.1 | – | 28.1 | 28.4 | 174.2 | 27.8 |
| CFL | 80.9 | 9.9 | – | – | 75.0 | 8.8 | – | – | – | – | 97.4 | 15.6 |
| CFD | 28.4 | 3.5 | – | – | 26.1 | 3.1 | – | – | – | – | 36.0 | 5.8 |
| CLO | – | – | – | – | 70.5 | 8.3 | – | – | – | – | – | – |
| CPD | 20.2 | 2.5 | 25.5 | 3.4 | 15.9 | 1.9 | – | – | 2.3 | 2.3 | 13.7 | 2.2 |
| D1B | – | – | 64.6 | 8.6 | 56.6 | 6.7 | – | – | – | – | – | – |
| D2B | 50.0 | 6.1 | 47.9 | 6.4 | 51.3 | 6.0 | – | – | – | – | – | – |
| DCS | 140.2 | 17.2 | 109.8 | 14.6 | 119.3 | 14.0 | – | – | – | – | – | – |
| DL | 353.1 | 43.2 | 341.2 | 45.5 | 371.6 | 43.7 | 33.8 | – | 42.8 | 43.2 | 334.5 | 53.4 |
| DW | 387.0 | 47.4 | 406.6 | 54.2 | 347.8 | 40.9 | – | – | 56.3 | 56.9 | 349.8 | 55.9 |
| HL | 178.1 | 21.8 | 172.5 | 23.0 | 204.4 | 24.0 | 22.2 | – | 23.6 | 23.8 | 171.8 | 27.4 |
| IDS | – | – | 53.6 | 7.1 | – | – | – | – | – | – | – | |
| MOW | 80.6 | 9.9 | 99.9 | 13.3 | 95.5 | 11.2 | 13.6 | – | 12.7 | 12.8 | 87.1 | 13.9 |
| P2A | 77.2 | 9.5 | 103.1 | 13.7 | 88.7 | 10.4 | – | – | 8.1 | 8.2 | 141.6 | 22.6 |
| P2B | 134.6 | 16.5 | 108.3 | 14.4 | 81.3 | 9.6 | – | – | 11.7 | 11.8 | 107.9 | 17.2 |
| P2S | 206.8 | 25.3 | 208.5 | 27.8 | – | – | – | – | 23.7 | 23.9 | 211.9 | 33.8 |
| PCS | 356.0 | 43.6 | 358.5 | 47.8 | – | – | – | – | 44.9 | 45.4 | 241.7 | 38.6 |
| PD1 | – | – | 468.1 | 62.4 | – | – | – | – | – | – | – | – |
| PD2 | 632.3 | 77.4 | 586.3 | 78.2 | – | – | – | – | – | – | – | – |
| PDI | – | – | 83.1 | 11.1 | – | – | – | – | – | – | – | – |
| PDO | – | – | 181.3 | 24.2 | – | – | – | – | – | – | – | – |
| PGW | 198.4 | 24.3 | 187.2 | 25.0 | 195.2 | 23.0 | – | – | 23.7 | 23.9 | 172.2 | 27.5 |
| PIW | 150.3 | 18.4 | 173.7 | 23.2 | 180.3 | 21.2 | – | – | 22.1 | 22.3 | 173.0 | 27.6 |
| POR | 73.0 | 8.9 | 62.6 | 8.3 | 85.4 | 10.0 | 7.7 | – | 9.6 | 9.7 | 56.2 | 9.0 |
| PP2 | 328.5 | 40.2 | 307.3 | 41.0 | 348.4 | 41.0 | 34.8 | – | 44.4 | 44.8 | 299.0 | 47.7 |
| SL | 816.8 | 100.0 | 750.2 | 100.0 | 850.4 | 100.0 | – | – | 99.0 | 100.0 | 626.2 | 100.0 |
| TAL | 493.5 | 60.4 | 436.8 | 58.2 | 502.0 | 59.0 | – | – | 55.4 | 56.0 | 318.3 | 50.8 |
| TBW | 94.8 | 11.6 | 109.7 | 14.6 | 132.7 | 15.6 | – | – | 13.2 | 13.3 | 103.5 | 16.5 |
| TL | 897.7 | 109.9 | – | – | 925.4 | 108.8 | – | – | – | – | 722.6 | 115.4 |