Eleven new heteroscleromorph Demospongiae (Porifera), and a new record of the tetractinellid Ancorina corticata, from Walters Shoal, a shallow seamount on the Madagascar Ridge in the South West Indian Ocean (SWIO) Author Payne, Robyn P. Anchor Environmental Consultants, Suite 8, Steenberg House, Steenberg Office Park, Silverwood Close, Tokai 7945, Cape Town, South Africa & Department of Biodiversity and Conservation Biology, University of the Western Cape, Private Bag X 17, Bellville 7535, Cape Town, South Africa Author Samaai, Toufiek Department of Forestry, Fisheries and Environment, Oceans and Coasts Research, PO Box 52126, Victoria and Alfred Waterfront, Cape Town 8000, South Africa & Department of Biodiversity and Conservation Biology, University of the Western Cape, Private Bag X 17, Bellville 7535, Cape Town, South Africa & Iziko Museums of South Africa, Research and Exhibitions, Marine Biology, Cape Town, South Africa & Department of Biological Sciences, University of Cape Town, Private Bag X 3, Rondebosch 7701, Cape Town, South Africa Author Janson, Liesl Department of Forestry, Fisheries and Environment, Oceans and Coasts Research, PO Box 52126, Victoria and Alfred Waterfront, Cape Town 8000, South Africa Author Kerwath, Sven E. Department of Biological Sciences, University of Cape Town, Private Bag X 3, Rondebosch 7701, Cape Town, South Africa & Department of Forestry, Fisheries and Environment, Fisheries Research and Development, Foretrust Building, Foreshore, Cape Town 8000, South Africa Author Gibbons, Mark J. Department of Biodiversity and Conservation Biology, University of the Western Cape, Private Bag X 17, Bellville 7535, Cape Town, South Africa text Zootaxa 2025 2025-01-22 5575 1 1 56 https://doi.org/10.11646/zootaxa.5575.1.1 journal article 307964 10.11646/zootaxa.5575.1.1 7d16ebc8-0256-4a1d-bb96-9c8a25821fc5 1175-5326 14746045 C73577B9-1357-43BA-9B98-7366F8B654B0

TABLE 12. Comparative spicule dimensions of Callyspongia (Callyspongia) cacumen Payne, Samaai & Gibbons sp. nov. specimens and the species of Callyspongia (Callyspongia) occurring in the region of interest (WIO & South Africa). Micrometric values are in µm, n = 20 where applicable.

	Specimen	Oxea
Callyspongia (Callyspongia) cacumen sp. nov.	Holotype TS 2369	64 (57–69) × 3 (2–4)
	Paratype TS 2330	69 (61–76) × 4 (2–4)
	Paratype TS 2341	64 (55–69) × 3 (2–4)
	Paratype TS 2353	66 (58–75) × 3 (2–4)
	Callyspongia (Callyspongia) differentiata (Dendy, 1922)	80 × 3
	Callyspongia (Callyspongia) reticutis (Dendy, 1905)	72 × 3
	Callyspongia (Callyspongia) tubulosa (Linnaeus, 1759) sensu (Esper, 1797)	110–140 × 13