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APPENDIX 1.

Phylogenetic character matrix scoring UOMNH F-70509, featuring our additional character (19 - describes the reduction of the first upper molar) and the character matrix of Li and Spassov (2017). This matrix was analysed under the parsimony optimality criterion in TNT 1.5 (Goloboff and Catalano, 2016) via implicit enumeration with unordered characters and the taxon Proailurus lemanensis as the outgroup.

Character Matrix:.nex file

#NEXUS

 

BEGIN DATA;

DIMENSIONS NTAX=6 NCHAR=19;

FORMAT DATATYPE = STANDARD RESPECTCASE GAP = - MISSING = ? SYMBOLS = " 0 1 2 3 4";

CHARLABELS

Nasal_bones_shape Shape_of_upper_canine_crown Upper_canine_crenulations Orientation_of_PM3_and_PM4. Mesial_cusp_of_PM3 'PM3, disto-lingual basal expansion of crown' 'PM3, mesio-distal elongation of crown' 'Relative size PM4-PM3' Place_of_PM4_protocone Buccal_border_of_PM4 Protocone_of_PM4 PM4_ectostyle M1_crown Mandibular_symphysis_outline pm2 'pm4 mesio-buccal basal expansion in the crown' m1_talonid. Sagittal_crest M1_roots;

MATRIX

Proailurus_lemanensis ?000000000000000000

Promegantereon_ogygia 0100100000000100101

Paramachaerodus_transasiaticus 111110110111021(0 1)211

Paramachaerodus_orientalis 21210111122212214?(1 2)

Paramachaerodus_maximiliani 2120?0111222122?31(1 2)

'UOMNH F-70509' ?11?????????0?????0

 

;

END;

 

APPENDIX 2.

Comparative serration density per millimeter as counted on the canines of Nimravidae and Machairodontinae specimens from assorted museum specimens. Institutional abbreviations: AMNH, American Museum of Natural History, Division of Paleontology, New York, New York, USA; F:AM, American Museum of Natural History, Frick Collection, New York, New York, USA; UF, Florida Museum of Natural History, University of Florida, Gainesville, Florida, USA; LACMHC, Los Angeles County Museum, George C. Page Museum (Hancock Collection), Los Angeles, California, USA.

Specimen Number/ Ref. Taxon Serration density (#/mm)
Nimravidae    
AMNH 79999 Barbourofelis morrisi 4.1
F:AM 25204 Barbourofelis morrisi 4.3
F:AM 69359 Barbourofelis morrisi 3.7
Bryant (1988) Barbourofelis loveorum 3.9
AMNH 108193 Barbourofelis fricki 4.0
F:AM 61983 Barbourofelis fricki 3.7
F:AM 61856 Albanosmilus whitfordi 4.1
F:AM 61849 Albanosmilus whitfordi 4.1
Machairodontinae    
AMNH 95297 Homotherium ischyrus 1.8
F:AM 50461 Homotherium latidens 2.1
F:AM 50469 Homotherium latidens 2.2
F:AM 50445 Dinofelis diastemata 2.1
F:AM 50478 Amphimachairodus giganteus 1.9
F:AM 104044 Machairodus catocopis 2.3
F:AM 69263 Machairodus coloradoensis 1.8
UF 60000 Xenosmilus hodsonae 1.1
LACMHC A-3708 Smilodon fatalis 2.6