FIGURE 11 in Taxonomy and distribution of irregular echinoids (Echinoidea: Irregularia) from Sri Lanka

FIGURE 11. SEM images showing details on test surface of Koehleraster abnormalis (WUSL/EI/8): A, apical system; B, periproct; C, orientation of pores on aboral surface; D, orientation of pores on oral surface.Published as part of Arachchige, Gayashan M., Jayakody, Sevvandi, Mooi, Rich & Kroh, Andreas, 2019, Taxonomy and distribution of irregular echinoids (Echinoidea: Irregularia) from Sri Lanka, pp. 1-100 in Zootaxa 4541 (1) on page 17, DOI: 10.11646/zootaxa.4541.1.1, http://zenodo.org/record/261746