FIGURE 4 in Description and molecular phylogeny of Tethya hibernica sp. nov. (Porifera, Demospongiae) from Northern Ireland with remarks on the European species of the genus Te t h y a *

FIGURE 4. Megascleres (strongyloxeas) of T. hibernica. A. SEM image collage of a main megasclere, presenting typical geometry and diameters of both ends and a middle section. B. Size distribution of auxiliary megascleres (filled triangles; n = 70) and main megascleres (filled circles, n = 40), which form distinct groups of normal distributions (Kolmogorov-Smirnov test), significantly separated by spicule length (p <0.001; independent t-test).