Observed contact incidences between apical plate pairs in echinoids along with topological index values. Abbreviations: OUT, outgroup representing the regular pattern; BI, basal Irregularia; BA, basal
Describing patterns of connectivity among organs is essential for identifying anatomical homologies among taxa. It is also critical for revealing morphogenetic processes and the associated constraints
TABLE 2. — Test measurements, proportions and features for Diadema mexicanum A. Agassiz, 1863 and D. paucispinum A. Agassiz, 1863. Abbreviation: SD, standard deviation. D. mexicanumD. paucispinumOrigi
Scanning electron microscope image of Lytechinus pictus [sea urchin] embryo at the 2-cell stage. The fertilization envelope has been removed to reveal the cells covered with a dense meshwork of the hy
These data include morphometrics of individual purple sea urchins, Strongylocentrotus purpuratus (urn:lsid:marinespecies.org:taxname:240747), involved in a multifactorial laboratory experiment at the