Acropora retusa (Dana, 1846)

van der Meij, Sancia E. T. & Visser, Rémon R., 2011, The Acropora Humilis Group (Scleractinia) Of The Snellius Expedition (1929 - 30), Raffles Bulletin of Zoology 59 (1), pp. 9-17 : 15

Acropora retusa (Dana, 1846)

( Fig. 3f–g )

Madrepora retusa – Dana, 1846 p. 462.

Acropora (Acropora) retusa – Wallace, 1999: 130–131.

Acropora retusa – Veron, 2000: 322.

Material examined. – Indonesia, Bonetambung near Makassar ( RMNH Coel.39606); Batuata ( RMNH Coel.39604–39605); Nenusa Isl., Karatung ( RMNH Coel.39607); Talaud Isl., Beo, Karakelong ( RMNH Coel.39897–39898).

Short description. – Colony corymbose; branches terete, appearing broader at tip, 7–13 mm in diameter and up to 30 mm long, growth determinate. Axial corallite outer diameter 2.4–3.5 mm; radial corallites unevenly distributed and in different sizes, tubular with dimidiate openings, sometimes appearing nariform.

Biogeography. – The species is represented in the Snellius collection, despite the disjunctive range presented by Wallace (1999): western Indian Ocean and central Pacific Ocean but not in between. Acropora retusa is found to occur on four sites in Indonesia, ranging from Nenusa Isl. and Talaud Isl., north of Sulawesi, to Bonetambung and Batuata in south Sulawesi. It has also been reported from the Solomon Islands (Veron and Turak, 2006).

Figures

Fig. 3a-j. A. digitifera: a, complete specimen, b, branch (both RMNH Coel.39564); A. multiacuta: c, complete specimen (RMNH Coel.39601), d, close-up (RMNH Coel.39904), e, branch (RMNH Coel.39603); A. retusa: f, complete specimen (RMNH Coel.39607), g, branch (RMNH Coel.39604); A. fastigata: h, branch (RMNH Coel.39566), i-j, close-ups (both RMNH Coel.39567). Scale bars 2 cm: left scale bar for a, c-d, f, h; right scale bar for b, e, g, i-j.