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Table 2 Meristic comparison among B. groenlandica B, stensiöi, Birgeria liui and Birgeria acuminata

From: Postcranial skeleton of Birgeria liui (Osteichthyes, Actinopterygii) from the Longobardian (Ladinian, Middle Triassic) of Xingyi, Guizhou, South China

  New Specimen of Birgeria liui Holotype of B. liui B. groenlandica B. stensiöi Birgeria acuminata
Neural arches ≈ 84 ? ≈ 80 ≈ 80 ≈ 80
Pectoral fin
 Radial ossification 8 ? 10 11 9–10
 Lepidotrichia > 40 ? ≈ 40 44 43
Pelvic fin
 Radial ossification ≈ 17 ? 13 13 ?
 Lepidotrichia ≈ 40 ? 50 50–60 > 60
Dorsal fin
 Axonost 13 14 13-15 3 (?) 17
 Baseost ≈ 38 > 24 30 24 (?) 21
 Axonost plate Present ? Present Present ?
 Distal radial ossification Absent Absent 3–4 Absent Absent
 Lepidotrichia ≈ 115 > 50 53–57 55–60 > 40
 Fulcra 5 ? Absent Absent ?
Anal fin
 Axonost 16 + 8 14 + 7 17 + 5 17 + 7 17 + 4
 Baseost ≈ 20 > 3 10 6–8 4
 Axonost plate Present Present Present Present Present
 Lepidotrichia ≈ 110 >50 60-62 53 ≈ 80
 Fulcra 6 ? absent ≥ 2 ?
Caudal fin
 Lepidotrichia > 140 > 60 65 37 > 95
 Fulcra > 10; 3 > 12; 2–3 14; 0 14; 2–3 15
 Intersecting angle of the dorsal and ventral margins of the caudal fin 76° 70° 40° 65° 73°