Taxonomy and distribution of irregular echinoids (Echinoidea: Irregularia) from Sri Lanka Author Arachchige, Gayashan M. Author Jayakody, Sevvandi Author Mooi, Rich Author Kroh, Andreas text Zootaxa 2019 2019-01-03 4541 1 1 100 journal article 27715 10.11646/zootaxa.4541.1.1 9c3fecf1-4e11-4c79-a908-e0a5abbaf3ca 1175-5326 2617460 B11E734C-218B-418C-84E6-719AB3C58AFF Fibulariella angulipora Mortensen, 1948 Figures 34 , 35 1948d Fibularia ( Fibulariella ) angulipora Mortensen : p. 6. 1948b Fibularia ( Fibulariella ) angulipora Mortensen. —Mortensen: p. 224–225; pl. 46: figs. 1–4, 12–14. Material studied. Ten denuded tests: WUSL/EI/132, EI/133, EI/144, EI/145, EI/146, EI/147, EI/148, EI/149, EI/ 150, and EI/151, from Etalai, Kalpitiya, Sri Lanka . Description. Shape and size —Test oval, rounded or pointed at both ends, small size, 3.39–7.14 mm TL, longer than broad, width 65–71% TL, height 43–53% TL; greatest height usually anterior to apical system; oral side convex; raised, rounded margin; aboral surface sloping slightly downward towards posterior end. Apical system —Subcentral, 41–51% TL from anterior margin; four small, circular gonopores, multiple small hydropores, not in groove, scattered over anterior portion of madreporic plate. Ambulacra —Petaloid area longer than half of TL, 66–71% TL; petaloid area width 40–46% TL; petals short, with 3–5 pore pairs in posterior paired petals, 3–4 pore pairs in anterior paired petals, 4–5 pore pairs in petal III; pores in posterior petals markedly triangular. FIGURE 34. Fibulariella angulipora (WUSL/EI/164): A, aboral view; B, oral view; C, lateral view. Peristome —Medium-sized, 15–19% TL; usually rounded, width 13–17% TL; lies slightly anterior of centre, 40–47% TL from anterior margin. Periproct —Small, 8–9% TL; oval in outline, slightly elongate; situated closer to peristome than posterior edge, 17–23% TL from posterior margin. FIGURE 35. Distribution map of Fibulariella angulipora recorded in this study. Geographic range. Indo-West Pacific, from Andaman Sea ( Putchakarn & Sonchaeng 2004 ) to Gulf of Siam and the Molucca Sea ( Mortensen 1948b ). Bathymetric range. 15 m ( Mortensen 1948b ). Observed occurrence in Sri Lanka . The current study found only denuded tests of F. angulipora on the shore of Etalai, Kalpitiya, in north-western coasts of Sri Lanka ( Fig. 35 ). Remarks. According to ( Mortensen 1948b: 225 ), this species differs from the two other Fibulariella species, F. acuta and F. oblonga , by the large, triangular pores in the petals. F. angulipora is recorded here for the first time from Sri Lanka . This supports Mortensen's (1948b: 225) suggestion that the specimen mentioned as Fibularia volva by H. L Clark (1915) was in reality Fibulariella angulipora , not Fibularia volva .