Acanthotetilla celebensis sp. nov., a new species from North Sulawesi, Indonesia (Porifera: Demospongiae: Spirophorida: Tetillidae) Author De, Nicole J. Author Van, Rob W. M. text Zootaxa 2007 1397 25 28 journal article 10.5281/zenodo.175349 9706ab7a-6f98-4cbb-86fe-de54fac22d01 1175­5326 175349 Acanthotetilla celebensis sp. nov. ( Fig. 1 A­J) Material examined. Holotype RMNH POR . 2877, Indonesia , North Sulawesi, Bunaken Islands SW, Likuan I, 01º 35.731'N 124º 46.129'E ; 14 m . , coll. N.J. de Voogd, #MD17/ 220502 /137, 22­05­2002 . Description. Shape: semiglobular, hemispherical, cavernous inside. Size of the holotype is 10 x 12 cm. Surface: hispid bristly, a thin layer of sand covers the surface, obscuring oscules. Only a single porocalyx was observed. Texture: tough, hard, incompressible. Colour: yellow, cream­yellow in spirit TABLE 1 . Measurements (µm) of the spicules of the species of Acanthotetilla .

Oxeas	Protriaenes Shaft Clads	Anatriaenes Shaft Clads	Acanthoxeas	Sigmaspires
A. hemisphaerica 3100–3812–4400 Burton, 1959 24–29.9–35	1000–1920–2520 30–38–56 6–10–14 6–8–10	1260–1450–1600 55–70–80 9–9.5–10 9	325–372–414 40–46.4–60	9–11–13
A. enigmatica 2200 –2960–3800 Lévi, 1964 14–25.1 –30	2000–2500–3000 50–68–95 9 9	3000 50–70	211–225.8–244 16–19.5–23	8–9.6–11
A. seychellensis I.1400–1516–1680 Thomas, 1973 34–37.8–47 II.740–1138–1260 6–10.9–14	360–907–1880 20–38–50 1.5–2.5–4 1.5–3–4	– –	212–278.4–322 4–8–9	8–10.3 –12
A. gorgonosclera 770–1216–1600 Van Soest, 1977 3–13.2–17	1260–1377–1540 41–63–81 4–5.3 – 9 3–4.1–7	– 42–53–64 5–5.5–6 4–5–6	228–281.1–371	9–13.1–16
A. celebensis 1763 –1923–2123 sp. nov. 20–31–33	1248 40–45–50 7 34	1977 45–52–60 22 4–4.5–5	I. 300–405–442 20–25–33 II. 199–257–284 10–15–17	8–10–12

Skeleton. The peripheral skeleton shows cortical specialization conforming to the description of the type species as presented in the Systema Porifera, i.e. consisting of a dense palisade of megacanthoxeas, visibly macroscopically by a white outerzone. The skeleton is radiate, composed of oxeas, rare very thin anatriaenes and even rarer protriaenes intermingled with megacanthoxeas protruding the surface. The skeleton is less dense interiorly, with megacanthoxeas and sigmaspires as the main spicules present. FIGURE 1. A. Acanthotetilla celebensis sp.nov. , in situ photograph of holotype photo N.J. de Voogd; B. Acanthotetilla celebensis sp.nov. , preserved specimen of holotype showing the choanosome (scale bar = 3 cm); C. sigmaspire, (scale bar = 2 μm); D. megacanthoxea, (scale bar = 20 μm); E. megacanthoxea, (scale bar = 50 μm); F, G. detail of same, (scale bar = 10 μm); H. oxea, (scale bar = 20 μm); I. protriaene, (scale bar = 10 μm); J. anatriaene, (scale bar = 20 μm). Spicules. Megascleres: Large smooth oxeas: 1923 ( 1763–2132 ) x 31 (20–33) µm. Protriaenes: 1248 x 7 µm (cladi 45 x 4.5 µm ) . Anatriaenes: 1977 x 22 µm (cladi 52 x 4.5 µm). Two size categories of thickly spined curved megacanthoxeas with spines arranged in irregular whorls; I 405 (300–442) x 25 ( 20 x 33 ) µm; II 257 (199–284) x 15 (10–17) µm. Microscleres: Abundant microspined sigmaspires: 10 (8– 12) x 1.5 (1–2) µm Ecology. Reef wall at a depth of 14 m . Geographic distribution. Only recorded from the type locality Etymology. Named after the island of Sulawesi, formerly known as Celebes.