APPENDIX 1.

Locality, stratigraphic information and measurements of all specimens (type as well as additional present collection) of Sivajiceratinae within the mainland of Kutch. For detail information of localities see Spath (1931); Waagen (1875); Figure 1. Available in PDF.

APPENDIX 2.

Precise stratigraphy and locality information of the all the specimens of Obtusicostites and Hubertoceras. Available in PDF.

APPENDIX 3.

Stratigraphic information and measurements of all contemporary macroconchiate (middle Callovian) species of different genera along with Hubertoceras (m). Available in PDF.

APPENDIX 4.

Results of Mann-Whitney U test for testing significance of change in morphological traits. Available in PDF.