GroupStruct: An R Package for Allometric Size Correction Author Chan, Kin Onn Lee Kong Chian Natural History Museum, 2 Conservatory Drive, 117377 Singapore. Author Grismer, L. Lee 0000-0001-8422-3698 Herpetology Laboratory, Department of Biology, La Sierra University, 4500 Riverwalk Parkway, Riverside, California 92505, USA. https: // orcid. org / 0000 - 0001 - 8422 - 3698 text Zootaxa 2022 2022-04-05 5124 4 471 482 journal article 10.11646/zootaxa.5124.4.4 1175-5326 6413684 FDDC4787-9906-453C-9A06-957A528D091A

TABLE 2. Results of the two-sample Hotelling’s T 2 test and associated p -value to quantify separation between groups in PC space. The T 2 statistic increases with increasing distance between two group centroids in PC space and with decreasing within-group variance. A significant p -value rejects the null hypothesis of no multivariate difference between groups, indicating a significant difference between PCA clusters.

Species comparisons	Raw		Ratios		Residuals		Allometry
Dataset 1:	T 2	p	T 2	p	T 2	p	T 2	p
maelanoi – chaunghanakwaensis	60.113	0.000	49.926	0.000	66.413	0.000	219.430	0.000
sinyineensis – chaunghanakwaensis	16.772	0.000	14.002	0.000	7.104	0.005	248.040	0.000
taungwineensis – chaunghanakwaensis	21.342	0.000	9.982	0.001	16.825	0.000	40.781	0.000
sinyineensis – maelanoi	28.536	0.000	28.384	0.000	22.459	0.000	118.970	0.000
taungwineensis – maelanoi	11.744	0.001	9.610	0.002	8.353	0.003	187.550	0.000
taungwineensis – sinyineensis	15.902	0.000	12.622	0.001	11.221	0.001	260.310	0.000
Dataset 2:
gerutu – australis	50.835	0.000	19.048	0.000	5.547	0.020	170.060	0.000
larutensis – australis	16.063	0.000	16.933	0.000	0.472	0.629	162.920	0.000
larutensis – gerutu	2.339	0.117	4.728	0.018	5.974	0.008	3.153	0.060