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Table 1 Selected measurements of Zygodactylus ochlurus n.sp. compared to other zygodactylids [3,4,5,6, 8, 9]

From: A new zygodactylid species indicates the persistence of stem passerines into the early Oligocene in North America

  SKL COR HUM ULN CMC FEM TIB TMT pI1 pI2 pII1 pII2 pII3 pIII1 pIII2 pIII3 pIII4 GM FEM/ GM CMC/ GM pI1/ pes pIII1/ pes
YPM VPPU 17053 Zygodactylus ochlurus n.sp. Holotype 21.0 ~ 8.7/ ~ 8.7 12.5/ ~ 13.2/ 14.7 6.7/ / 10.3 / ~ 21.4 15.6/ 15.4 3.8/ 2.0/ 3.2/ 3.0/ 3.3/ / 2.8 / 3.3 / 3.0 / 2.0 12.6 0.82 0.53 0.23 0.17
SMF Av 519a Zygodactylus luberonensis Holotype 35.0 14.7/ 17.2/ 17.2 18.1/ / 8.6 ~ 19.5/ 34.8/ 34.7 24.6/ 24.5 / 4.6 / 2.1 / 6.5 / 4.6 / 2.7 / 7.1 / 6.5 / 5.4 / 3.1 18.8 1.04 0.46 0.16 0.25
FMNH PA 726b Zygodactylus grandei Holotype 21.1 13.7/ 18.3/18.6 19.3/ ~ 8.5 15.1/ 33.0/33.6 21.4/20.4 4.6/4.3 2.6/2.7 /5.2 4.7/4.6 3.0 6.0/5.8 5.0/5.2 4.2/4.4 3.8/3.9 17.9 0.84 0.47 0.17 0.22
USNM 299821c Eozygodactylus americanus ~ 19   16.8/ 16.8 ~ 19/ 19.1 / 8.8                  
WDC-CGR-014c Eozygodactylus americanus   13.8/ ~ 13.1 / ~ 17.2 ~ 18.2/ 8.8/ 19.7/ / 30.6 21.7/ 21.8 5.4/ ~ 5.6 2.5/ ~ 2.0 / 5.9 5.1/ 5.2 2.9/ ~ 2.2 ~ 6.0/ ~ 4.6 5.7/ 5.7 4.7/ 4.8 ~ 2.7/ 3.3 18.2 1.08 0.48 0.21 0.20
SMF-ME 1758a + bd Primozygodactylus major Holotype    ~ 28.4/ ~ 31.1/ ~ 12.0/ 24.6/ 39.0/ 39.8 28.0/           25.7 0.96 0.47   
SMF-ME 2108d Primozygodactylus ballmanni Holotype    21.0/ 20.5 22.9/ 22.9 ~ 9.0 /~ 9.5 20.8/ 33.0/ 24.6/           20.5 1.02 0.45   
SMF-ME 2522a + bd Primozygodactylus danielsi Holotype    16.5/ 16.4 18.3/ ~ 17.4 8.2/ 8.1 / 16.5 27.4/ 27.3 19.6/ ~ 18.3 4.0/ 2.4/ 4.8/ 4.3/ 2.4/ 5.7/ 4.9/ 4.3/ 2.6/ 16.5 1.00 0.49 0.17 0.24
SMF-ME 1074d Primozygodactylus eunjooae Holotype       17.5/ 29.8/ ~ 21.7 /~ 21.7               
SMF-ME 11091a + bd Primozygodactylus quintus Holotype    19.7/ 20.0 20.7/20.7 9.5/9.5   32.5/32.5 22.8/23.1               
SMF-ME 11171a + bd Primozygodactylus longibrachium Holotype    > 19/ 19.6 21.4/> 21 9.6/   29.5/29.5 /19.0               
  1. aafter [2]
  2. bafter [6]
  3. cafter [9]
  4. dafter [5]
  5. SKL Rostrocaudal skull length, COR Coracoid, HUM humerus, ULN ulna, CMC carpometacarpus, FEM femur, TIB tibia, TMT tarsometatarsus, pI1 – pIII4 pedal digit (I-III) phalanx (1–4), measured in mm. GM geometric mean of HUM, ULN, CMC, FEM, TIB, and TMT; pI1/pes and pIII1/pes: pedal digit I/III proximal phalanx, scaled against the sum of lengths of the non-ungual phalanges of pedal digits I & III