Petrosia (Petrosia) hoeksemai de Voogd & van Soest, 2002

Putra, Singgih Afifa, Ambo-Rappe, Rohani, Jompa, Jamaluddin & de Voogd, Nicole J., 2024, Preliminary study of marine sponges (Porifera) in the littoral of Spermonde Archipelago, Indonesia, ZooKeys 1208, pp. 275-313 : 275-313

Petrosia (Petrosia) hoeksemai de Voogd & van Soest, 2002

Fig. 12

Diagnostic features.

The sponge is thick, massive, and encrusting with rugose surface. Color brown outside, cream inside, and turning blackish brown after preservation. Choanosomal skeleton shows pauci-multispicular spicule tracts. Three sizes of oxeas, primary oxeas 182.3–272.9 (219.6) × 10.8–19.2 (14.6) µm (n = 28), secondary oxeas 126.4–221.7 (173.6) × 6.7–11.4 (8.7) µm (n = 32), and tertiary oxeas 58–123.9 (83.1) × 5.6–10.5 (7.5) µm (n = 28).

Seven species of Petrosia have been reported from the Spermonde Archipelago, i. e., Petrosia (Petrosia) hoeksemai de Voogd & van Soest, 2002 , Petrosia (Petrosia) alfiani de Voogd & van Soest, 2002 , Petrosia (Petrosia) lignosa Wilson, 1925 , Petrosia (Petrosia) nigricans Lindgren, 1897 , Petrosia (Petrosia) plana Wilson, 1925 , Petrosia (Strongylophora) cortica ( Wilson, 1925) , and Petrosia (Strongylophora) strongylata (Thiele, 1903) . Two species were originally described from this area, Petrosia (Petrosia) alfiani and Petrosia (Petrosia) hoeksemai ( de Voogd and van Soest 2002) . Our specimen shows slightly bigger secondary and tertiary oxeas compare to the de Voogd & van Soest (2002) specimen. Comparison of spicules measurement between Indonesian Petrosia specimen are shown in Table 1 .

Distribution and ecology.

Samalona Island, the Spermonde Archipelago, attached vertically; reef flat; also reported from north Sulawesi ( de Voogd and van Soest 2002).

Figures

Figure 12. Petrosia (Petrosia) hoeksemai de Voogd & van Soest, 2002 a habitus in situ at Samalona Island, the Spermonde Archipelago (photograph by SAP) b three sizes of oxeas.