Description of the new species Kittonia kempii (Biddulphiales: Kittoniaceae) with comments on Kittonia hannai P. Lefébure & Chenevière and Kittonia gigantea (Greville) De Toni Author Sims, Pat A. 0000-0002-0214-8303 p. sims @ nhm. ac. uk; https: // orcid. org / 0000 - 0002 - 0214 - 8303 p.sims@nhm.ac.uk Author Williams, David M. 0000-0002-0584-307X d. m. williams @ nhm. ac. uk; https: // orcid. org / 0000 - 0002 - 0584 - 307 X d.m.williams@nhm.ac.uk text Phytotaxa 2022 2022-11-23 573 2 275 285 http://dx.doi.org/10.11646/phytotaxa.573.2.7 journal article 10.11646/phytotaxa.573.2.7 3fd5d86e-1214-4796-97df-fb30f3d2200f 1179-3163 7349988 Kittonia kempii P.A.Sims & D.M.Williams sp. nov. ( Figs 1–7 ) Type:— New Zealand , DSDP 275 1-2, 64- 5 cm , “Southeast Campbell Plateau, Position: 50°26.34’S ; 176°18.99’E […] Late Cretaceous”, New Zealand ; see Shipboard Scientific Party (1975) ( holotype BM 101972 !, one specimen = Figs 1, 2 ) Etymology:— Named for the late Klaus Kemp (1937–2022) who found and mounted the holotype specimen. Registration : http://phycobank.org/103337 Valve outline broadly oval with crenulated margin, two specimens found ( Figs 1, 2 , the holotype specimen, BM 101972 ; Figs 3–7 , SEM miCrographs): 36 x 127μm ( Figs 1, 2 ), 45 x 150μm ( Figs 3–7 ). Valve faCe gently Convex with depressed central area, small hyaline valve centre lying within ( Figs 5, 6 ). Well-developed marginal ridge separating valve from Crenulated mantle and margin, Ca. 7μm deep ( Figs 4–6 , arrows in Figs 5, 6 ). On valve faCe, towards pole, large hyaline area, stout tubular process with flattened summit at centre, angled towards valve margin, but not beyond it (second process presumed missing due to break in valve, Figs 1, 4 ). Ocellus-like structure on surface of subtriangular summit, Ca. 7.5μm wide with radial rows of five poroids surrounding hyaline margin ( Figs 1–5, 7 ). Areolae poroid arranged in rows radiating from valve Centre, Ca. 7 areolae in 10μm, 7 rows in 10μm ( Figs 1, 3–6 ). Areolae on valve face with raised rims and occluded by elaborate cribra ( Figs 1, 3–6 ). Mantle areolae in mostly vertical rows, cribra lying flush with valve surface ( Figs 5, 6 ). Only two specimens have been found, both lack a significant part of the central area where the rimoportulae would normally have been situated.