Figure 4 from: Tanaka H, Tsukagoshi A (2013) Description and scanning electron microscopic observation of a new species of the genus Polycopetta (Crustacea, Ostracoda, Cladocopina) from an interstitial habitat in Japan. ZooKeys 294: 75-91. https://doi.org/10.3897/zookeys.294.4846

Figure 4 - Distribution of pore systems and surface ornamentation of Polycopetta quadrispinata sp. n. drawn from an SEM image. Male, paratype (SUM-CO-2095). A right external view B left external view. Solid circle, open circle and double circle indicate the positions of simple pores, pore systems involving a circular depression and contiguous pore systems, respectively.