Table 1.

Cellular composition of afrotherian brains.

	E. myurus (n = 2)	P. tetradactylus (n = 2)	A. hottentotus (n = 2)	P. capensis (n = 2)	D. dorsalis (n = 1)
MBD	45.08	132.50	79.00	2517.00	1150.00
MBR	1.040 ± 0.082	2.440 ± 0.109	0.812 ± 0.044	16.853 ± 1.495	12.800
MCX	0.355 ± 0.009	0.968 ± 0.076	0.388 ± 0.024	9.184 ± 0.182	6.830
MHP	0.116 ± 0.030	0.271 ± 0.017	0.051 ± 0.011	1.294 ± 0.464	0.730
MCxT	0.471 ± 0.021	1.239 ± 0.059	0.439 ± 0.035	10.478 ± 0.646	7.560
MCB	0.168 ± 0.002	0.304 ± 0.028	0.084 ± 0.004	2.058 ± 0.224	1.920
MRoB	0.401 ± 0.063	0.894 ± 0.022	0.289 ± 0.013	4.317 ± 0.625	3.330
MOB	0.050 ± 0.010	0.159 ± 0.009	0.050	0.290	n.a.
NBR	129.190 ± 4.424	156.831 ± 20.600	65.074 ± 2.124	755.653 ± 72.145	504.564
NCX	16.423 ± 0.265	27.652 ± 6.497	19.870 ± 2.103	171.209 ± 35.277	90.650
NHP	9.443 ± 4.284	6.294 ± 0.658	1.646 ± 0.500	26.712 ± 6.216	8.313
NCxT	25.865 ± 4.020	33.947 ± 5.840	21.516 ± 2.154	197.933 ± 29.082	98.960
NCB	89.312 ± 2.852	110.653 ± 14.948	34.488 ± 3.207	488.373 ± 42.322	360.929
NRoB	14.012 ± 3.258	12.232 ± 0.188	9.070 ± 1.069	69.358 ± 0.762	44.671
NOB	9.694 ± 1.745	12.828 ± 0.380	n.a.	“20.909”	n.a.
OBR	78.594 ± 7.733	103.349 ± 15.610	46.361 ± 0.527	620.622 ± 37.616	413.574
OCX	18.131 ± 0.071	32.828 ± 5.773	19.712 ± 4.369	316.979 ± 28.785	166.660
OHP	8.097 ± 1.176	7.659 ± 0.555	1.658 ± 0.246	49.654 ± 15.244	16.877
OCxT	26.229 ± 1.104	40.486 ± 5.217	21.370 ± 4.614	366.620 ± 13.520	183.540
OCB	23.368 ± 1.279	34.658 ± 15.801	8.155 ± 0.813	91.005 ± 30.180	77.571
ORoB	28.997 ± 7.906	28.204 ± 5.408	16.835 ± 3.276	162.985 ± 6.105	152.467
OOB	4.919 ± 1.108	14.776 ± 5.204	n.a.	14.791	n.a.
DNBR	124,661 ± 5575	64,104 ± 5587	80,519 ± 6978	45,576 ± 8325	39,413
DNCX	46,272 ± 426	28,213 ± 4497	51,070 ± 2260	18,726 ± 4212	13,272
DNHP	77,004 ± 17,012	23,164 ± 975	33,628 ± 6273	21,712 ± 2982	11,450
DNCxT	54,644 ± 6098	27,236 ± 3416	48,932 ± 1004	19,134 ± 3955	13,098
DNCB	531,494 ± 10,651	362,537 ± 15,780	409,687 ± 18,667	242,415 ± 46,950	188,180
DNRoB	34,520 ± 2702	13,696 ± 547	31,616 ± 5124	16,436 ± 2556	13,423
DNOB	194,678 ± 4,037	80,805 ± 2181	n.a.	73,110	n.a.
DOBR	75,454 ± 1486	42,206 ± 4518	57,227 ± 2452	37,317 ± 5542	32,305
DOCX	51,102 ± 1096	33,653 ± 3322	50,301 ± 8149	34,590 ± 3820	24,401
DOHP	71,995 ± 8477	28,244 ± 276	33,005 ± 2294	39,186 ± 2271	23,247
DOCxT	55,693 ± 138	32,550 ± 2661	48,146 ± 6674	35,203 ± 3461	24,291
DOCB	139,028 ± 5956	110,153 ± 41,831	96,849 ± 5069	46,365 ± 19,711	40,444
DORoB	70,967 ± 8566	31,716 ± 6830	58,880 ± 13,983	38,353 ± 4138	45,813
DOOB	97,872 ± 2587	91,369 ± 27,555	n.a.	51,715	n.a.
O/NBR	0.607 ± 0.039	0.657 ± 0.013	0.713 ± 0.031	0.824 ± 0.029	0.820
O/NCX	1.104 ± 0.013	1.205 ± 0.074	0.980 ± 0.116	1.897 ± 0.223	1.838
O/NHP	1.008 ± 0.332	1.221 ± 0.039	1.004 ± 0.119	1.825 ± 0.146	2.030
O/NCxT	1.032 ± 0.119	1.202 ± 0.053	0.982 ± 0.116	1.883 ± 0.208	1.855
O/NCB	0.261 ± 0.005	0.299 ± 0.102	0.236 ± 0.002	0.182 ± 0.046	0.215
O/NRoB	2.048 ± 0.088	2.300 ± 0.407	1.839 ± 0.144	2.351 ± 0.114	3.413
O/NOB	0.503 ± 0.024	1.141 ± 0.372	n.a.	0.707	n.a.

Cellular composition of the five Afrotherian species. All masses in grams. Numbers of cells in millions. M_BD, body mass; M_BR, brain mass; M_CX, mass of the cerebral cortex (excluding the hippocampus); M_HP, mass of the hippocampus; M_CXT, mass of the cerebral cortex including the hippocampus; M_CB, mass of the cerebellum; M_ROB, mass of the rest of the brain; M_OB, mass of the olfactory bulb; N, number of neurons; O, number of other (non-neuronal) cells; DN, density of neurons (neurons/mg); DO, density of other cells (other cells/mg); O/N, ratio between numbers of other cells and neurons.