The Apicomplexa Aggregata spp. are intracellular parasites of cephalopods that infect the intestinal tract of commercially important species such as Octopus bimaculatus, which sustains the octopus fishery in Baja California (B.C.), Mexico. In this study, Aggregata polibraxiona n. sp. was described from the cecum of O. bimaculatus collected from Bahia de Los Angeles, B. C. Light and electron microscopy revealed that oocysts and sporocysts were spherical to ovoid in shape. Sporulated oocysts (293–835 × 177–688 μm) contained 135–674 sporocysts (12–24 × 11–22 μm). The sporocyst wall was covered by tubular projections (0.55–2.19 μm in length) bifurcated in the top, unevenly distributed, covered by a thin membrane. Each sporocyst contains 11–13 sporozoites (16–26 × 1.20–3 μm). Three partial sequences of the 18S rDNA gene were obtained, and two phylogenetic approaches were performed according to Bayesian inference and Maximum Likelihood. In both phylogenetic reconstructions, the sequences of A. polibraxiona n. sp. were recovered as a monophyletic group within the genus Aggregata and placed as a sister group to Aggregata octopiana Lineage II. Aggregata polibraxiona n. sp. is the first Apicomplexa described from a cephalopod host from Mexico and extends the geographical range of Apicomplexa infecting cephalopods.

Apicomplexa Aggregata spp。是头足类动物的细胞内寄生虫，它感染具有重要商业价值的物种的肠道，如章鱼双斑鱼，它在墨西哥下加利福尼亚州 (BC) 维持章鱼渔业。在这项研究中，Aggregata polibraxiona n. sp. 是从O的盲肠中描述的。双斑鱼从 Bahia de Los Angeles, BC 收集的光和电子显微镜显示，卵囊和孢子囊呈球形至卵形。孢子化卵囊 (293–835 × 177–688 μm) 包含 135–674 个孢子囊 (12–24 × 11–22 μm)。孢子囊壁被顶部分叉的管状突起（长度为 0.55-2.19 μm）覆盖，分布不均匀，被薄膜覆盖。每个孢子囊包含 11-13 个子孢子（16-26 × 1.20-3 μm）。获得了18S rDNA基因的三个部分序列，并根据贝叶斯推理和最大似然法进行了两种系统发育方法。在两种系统发育重建中，A的序列。polibraxiona n. sp. 作为Aggregata属内的一个单系群被回收并作为Aggregata octopiana Lineage II的姊妹组。Aggregata polibraxiona n. sp. Apicomplexa 是从墨西哥头足类宿主中描述的第一个 Apicomplexa，并扩展了 Apicomplexa 感染头足类动物的地理范围。