Here you may find some information about XYOM analyses, they are dedicated to characterization, classification and identification, oriented to entomological practices.

Current XYOM version 2 is going online very soon, requiring much less user operations than in the first version.  

In the new XYOM version 2, the rule is grossly the following: just enter the raw coordinates, … These raw coordinates are either of anatomical landmarks, or pseudo-landmarks describing a closed contour.

The main analytical steps following the uploading of raw coordinates are:

  1. Characterization, i.e., size and shape separation
  2. Classification (group PCA, discriminant analysis, UPGMA trees, …)
  3. Identification (using geometric morphometrics and/or machine learning algorithms …)
  4. Miscellaneous (Escoufier, Garcia, …)
  5. File working (if needed)

Hereunder some video help, and a few words about input format

CHARACTERIZATION (size and shape extraction) in XYOM V2






Current XYOM version I (I, not II) analyses are organised in 6 categories:

For quick search, here is a small XYOM glossary




Input data are ASCII files located in either your computer hard disk or your Google drive. They must be entered in the correct input format (XYOM format = CLIC format).

E X A M P L E  of input data, as used in the published article about XYOM (Dujardin S. & Dujardin J.P., 2019):

LMSL means Landmarks + SemiLandmarks.

78, 76 is the subdivision of the file which contains data about two species: Panstrongylus chinai (n=78) and Triatoma carrioni (n=76). Data describe the operculum of the eggs. Each operculum was defined by two landmarks (LM) and 12 semilandmarks (SL). The SL code is 1,8,2,4 (which means 8 SL after the first LM, and 4 SL after the second LM). See Santillán-Guayasamín et al, 2017; Dujardin S. & Dujardin JP, 2019.

OTL means outlines (pseudolandmarks).

78, 75, 75 is the subdivision of the file. Data are pseudolandmarks describing the complete contour of eggs that belong to Panstrongylus chinai (n=78), P. howardi (n=75) and Triatoma carrioni (n=75). See Santillán-Guayasamín et al, 2017.

Output data

  • will be saved on your hard disk in the format of your choice (XYOM format, TPS (like)  format, CSV format, JSON formats).
  • Alternatively, they can be saved in your Google drive (XYOM format).