Stellar sample of pre-main-sequence and early ZAMS stars and pulsators, including the newly discovered pulsators. Circles of different colours correspond to the different samples of stars discussed in Sect. 2.1. Different symbols correspond to different pulsator classes described in Sect. 2.2 as well as in Sects. 3 and 4. Smaller and lighter coloured symbols correspond to candidates. The coloured error bars in the top give the typical uncertainty of the position of the stars from different sources. The black dash-dotted line illustrates an accreting evolutionary track as described in Sect. 6 and the thin black lines show the subsequent pre-main-sequence tracks evolved from the latter.