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.

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.

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 .