Diverse and well-preserved assemblages of organic-walled dinoflagellate cysts have been recovered from the Matulla Formation (Coniacian – Santonian), Gulf of Suez, Egypt. Among the abundant dinoflagellate cyst assemblages, the new species Odontochitina elbeialyi sp. nov. and Odontochitina ornata sp. nov. (Family Ceratiaceae) are described. The two new species are unique by having a granulate periphragm and three prominent horns. The horns are truncated distally and devoid of striae, ridges and perforations. Odontochitina elbeialyi sp. nov. is characterized by a weakly expressed tabulation on the pericyst indicated by the occasional presence of sutural lines or low ridges indicating the cingulum (two transverse ridges), at plate boundaries. Odontochitina ornata sp. nov. differs from the former, particularly by its clear tabulation, which is corniform gonyaulacoid and more strongly expressed by sutural ridges, and by rare short (rudimentary) sutural (mostly gonal) nipple-like, to truncated processes. Based on the current material, Odontochitina elbeialyi sp. nov. and Odontochitina ornata sp. nov. have short stratigraphic ranges and may therefore be considered as stratigraphic markers for the late Santonian (Late Cretaceous). Their comparison with all formally published species of the genus Odontochitina is presented and discussed, and the associated relevant dinoflagellate cyst taxa are also indicated. The paleoenvironmental significance of the Odontochitina elbeialyi sp. nov. and Odontochitina ornata sp. nov. is discussed.

在埃及苏伊士湾的马图拉组（科尼亚期 - 桑托尼期）中发现了多种且保存完好的有机壁甲藻包囊组合。在丰富的甲藻包囊组合中，新种Odontochitina elbeialyi sp。十一月 和Odontochitina ornata sp。十一月 (Ceratiaceae) 已被描述。这两个新物种的独特之处在于具有颗粒状的外壁和三个突出的角。角远端被截断，没有条纹、脊和穿孔。厄贝亚利齿齿甲属sp. 十一月 其特征是外囊上的弱表达列表，由偶尔存在的缝合线或指示扣带回的低脊（两个横向脊）指示，在板边界。奥齿甲壳属 (Odontochitina ornata sp.) 十一月 与前者不同，特别是其清晰的表层，呈角状膝沟状，并通过缝线脊和罕见的短（初级）缝线（主要是性腺）乳头状至截短的过程来更强烈地表达。根据目前的材料，Odontochitina elbeialyi sp。十一月 和Odontochitina ornata sp。十一月 地层范围较短，因此可被视为晚桑托尼世（晚白垩世）的地层标志。介绍并讨论了它们与所有正式发表的齿甲壳属物种的比较，并且还指出了相关的甲藻囊肿分类群。Odontochitina elbeialyi sp的古环境意义。十一月 和Odontochitina ornata sp。十一月 正在讨论。