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Table 6 Hoplitaspis hiawathai preabdomen measurements

From: A common arthropod from the Late Ordovician Big Hill Lagerstätte (Michigan) reveals an unexpected ecological diversity within Chasmataspidida

Specimen 1 2 3 4 Ventral plate
UWGM 1840A 4/18 17/17
UWGM 1840B 3/16 3/17 3/15 11/17
UWGM 1840C 4/22 17/22
UWGM 1863 1*/4* 2/20 2/20 3/19 10/20
UWGM 1871 1/17 2/19 2/19 2/17 10/19
UWGM 1873A 2*/33 5/36 5/35 5/33 21*/34
UWGM 1873B 1*/6* 2/8* 2/8* 3/9* 11/4*
UWGM 1873C 1*/17* 3/19* 3/18* 4/18* 7*/2*
UWGM 1875 3/29 4/32 5/32 5/28
UWGM 1876 20/26
UWGM 1877 1*/25 4/27 5/27 6/27
UWGM 1880 1*/5* 4/13* 4/14* 6/17* 15/5*
UWGM 1946B 3/10* 3/11* 4/12* 16/11*
UWGM 1946E 4/15* 4/15* 5/21*
UWGM 1949 1*/7* 2/8* 7/10
UWGM 2040 2*/9* 4/19
UWGM 2041 2/18* 3/17* 3/16* 3/16*
UWGM 2044A 11/12
UWGM 2044B 10/13
UWGM 2046 4/2* 4/2* 5/1* 19/24
UWGM 2063A 10/14
UWGM 2063C 8/9
UWGM 2063D 10/11*
UWGM 2069B 1*/15 3/15 3/15 3/15
UWGM 2070 3/11 11/11
UWGM 2268 2/28 3/32 4/33 5/32 14/33
UWGM 2273A 2/15* 3/14* 3/14*
UWGM 2273B 18/21
UWGM 2273C 19/19
UWGM 2275A 3/14* 3/13* 3/17*
UWGM 2279A 3/8* 4/8* 4/7* 4/7* 12/5*
UWGM 2279B 1*/17 2/18 3/18 3/17
UWGM 2279C 2/14 2/15 2/14
UWGM 2280 25*/32
UWGM 2281 1/9* 2/12* 2/12* 3/13* 8/14
UWGM 2284 17/23
UWGM 2700 2/20* 3/24 4/24 4/22
  1. Length/width. All measurements in millimetres. Isolated tergites were assigned to a segment based on size and differences in ornamentation. Asterisk (*) indicates an incomplete measurement