APPENDIX
Catalogue of the Holotype of Ambulocetus natans (H-GSP-18507).
This list complements Appendix 1 of Thewissen et al. (1996) to make a complete listing of all specimens constituting the holotype of Ambulocetus natans. In situ remains are mapped in Figure 1.
18507.801 T6.
18507.802 Sternebra.
18507.803 Sternebra.
18507.804 Rib fragment.
18507.805 Distal end of proximal phalanx, pedal third digit found in articulation with 18507.806.
18507.806 Proximal quarter of intermediate phalanx, pedal third digit found with 18507.805.
18507.810 Anterior Ca, approximately Ca4.
18507.811 Middle Ca, approximately Ca7.
18507.812 Middle Ca, in anatomical contact with 18507.811, approximately Ca8.
18507.813 Anterior Ca, approximately Ca3.
18507.821 T3.
18507.822 Distal half of left rib, found in association with 18507.823.
18507.823 Distal half of left rib.
18507.8301 T10, found articulated in sequence with 18507.8302.8303. This is the diaphragmatic vertebra.
18507.8302 T11, found between 18507.8301 and .8303.
18507.8303 T12, found articulated with 18507.8302.
18507.8304 T9.
18507.8305 T14, articulated with 18507.8306.
18507.8306 T15, articulated with 18507.8305.
18507.8307 L3.
18507.8308 L8.
18507.8309 Vertebral epiphysis from T6, in articulation with 18507.8308.
18507.832 T16 (posteriormost thoracic).
18507.8331 L4, found in articulation with 18507.8332.8334.
18507.8332 L5, found in articulation with 18507.8331 and .8333.8334.
18507.8333 L6, found in articulation with 18507.8331.8332 and .8334.
18507.8334 L7, found in articulation with18507.8331.8333.
18507.8335 L8, found just proximal to the sacrum, 18507.834.
18507.834 Sacrum
18507.835 L2.
18507.8401 Right rib, likely sixth, lacking head. 18507.8401 through .8406 were found lying to the right of the thoracic vertebrae, preserving anatomical order.
18507.8402 Right rib, likely seventh, lacking rib head.
18507.8403 Middle third of right rib, likely eighth.
18507.8404 Middle third of right rib, likely ninth.
18507.8405 Complete right rib, likely tenth.
18507.8406 Complete right posterior rib, likely eleventh.
18507.8409 Left rib head, likely tenth. Positioned near 18507.8410 and .8411.
18507.8410 Left rib, likely sixth, lacking head.
18507.8411 Middle two-thirds of left midthoracic rib, likely seventh.
18507.8412 Right posterior rib, possibly twelfth; complete except for distal end.
18507.8413 Left posterior rib, possibly eleventh, lacking head.
18507.8414 Complete right posterior rib, possibly fourteenth.
18507.8415 Complete left second rib.
18507.8418 Rib fragment.
18507.8420 Complete left posterior rib, possibly thirteenth.
18507.8420 through .8424 were found lying to the left
of the thoracic vertebrae, preserving anatomical order.
18507.8421 Complete left posterior rib, likely fourteenth.
18507.8422 Complete left anterior rib, possibly third.
18507.8423 Complete left posterior rib, likely fifteenth.
18507.8424 Proximal half of sixteenth left rib.
18507.8430 Rib fragment.
18507.8431 Rib fragment.
18507.8432 Rib fragment.
18507.8433 Rib fragment.
18507.851 Complete left innominate.
18507.852 Right innominate, preserving the ilium, acetabulum
and proximal portions of the pubis and ischium.
18507.853 Co-ossified right ecto- and mesocuneiform.
18507.854 Possible astragalar head.
18507.8610 Complete zygomatic arch found as float.
18507.8611 Right MC5, found in articulation with 18507.8612 .8614. Found in block with zygomatic arch. Identification based on similarity to 18507.33, .3301.3302.
18507.8612 Right fifth manual proximal phalanx.
18507.8613 Right fifth manual intermediate phalanx.
18507.8614 Fragmentary fifth manual terminal phalanx.
18507.8615 Left patella, found as float.
18507.8701 Fragmentary Ce4, found as float.
18507.8702 L1, found as float.
18507.8703 T2 centrum, found as float.