Table 2 Definition of the landmarks and semilandmark curves for the pygidium.
From: A dynamic and collaborative database for morphogeometric information of trilobites
Landmarks | |
|---|---|
Number | Definition |
LM1 | Anteriormost point of the pygidial axis |
LM2 | Posteriormost point of the pygidial axis |
LM3 | Border furrow at the sagittal point |
LM4 | Posteriormost point of pygidium at the sagittal line (if spiny LM 4 at the tip of the spine). |
LM5 | Intersection between the axial furrow and the anterior pygidial margin |
LM6 | Intersection between the anterior pygidial margin and the border furrow |
LM7 | Intersection between the anterior and the lateral pygidial margin |
Semilandmarks (curves) | |
Curve | Starting landmark - ending landmark |
Axis (C.1) | LM1 - LM2 |
Border furrow (C.2) | LM3 - LM6 |
Margin (C.3) | LM4 - LM5 |
