Fig. 9 in Tripedalia maipoensis Sun & Tsui & Wong & Cheung & Ng & Or & Qiu 2023, sp. nov.

Fig. 9. Sea urchin age as estimated from the sea urchin's test diameter (black circles) based on Gebauer and Moreno (1995). Blue circles correspond to the pinnotherid sizes. Arrow 1 corresponds to the period before the guest arrived inside the sea urchin. Arrow 2 corresponds to the range of sea urchin sizes containing the smallest and largest pinnotherids (approx. 3 and 9 cm diameter of test) found in this study. This size range corresponds to a growth period of 5 years for the sea urchin (estimated according to Gebauer and Moreno 1995) and for the guest crab as well, assuming that infestation by the pinnotherid occurred as a very early juvenile, shortly after metamorphosis. The two circled points (red circles) show the sea urchin that harbored the largest pinnotherid symbionts. Data below the lower dash line shows sizes of sea urchins that were never parasitized by pea crabs. The upper dash line indicates the age of the sea urchins in which the largest parasitic pinnotherid was found.