Cospuri Spermmania

The discovery of a distinct “spermia” reproductive cell challenges the traditional view of protist gametogenesis, aligning C. spermmania with a rare group of heterokont flagellates that employ motile gametes (e

Cospuri spermmania is a newly described, heterotrophic protist that inhabits oligotrophic coastal sediments and exhibits a unique reproductive strategy involving flagellated “spermia” cells. This paper presents a comprehensive overview of its taxonomy, ultrastructure, life cycle, ecological role, and potential applications in biotechnology. Field surveys across three biogeographic regions (Mediterranean, Caribbean, and Indo‑Pacific) revealed a patchy but abundant distribution, with densities up to 2 × 10⁵ cells cm⁻³ in micro‑oxic micro‑habitats. Laboratory cultures established in defined seawater media demonstrated rapid growth (doubling time ≈ 6 h) and a facultative symbiosis with the diatom Thalassiosira pseudocostata . Genomic sequencing (2.1 Gb, 95 % completeness) uncovered a compact gene set enriched for carbohydrate‑active enzymes (CAZymes) and novel polyketide synthase (PKS) clusters. Functional assays confirmed the production of a low‑molecular‑weight amphipathic compound (designated ) with antimicrobial activity (MIC = 1 µg mL⁻¹ against Staphylococcus aureus ). The data suggest that C. spermmania occupies a keystone niche in sedimentary carbon turnover and represents a promising chassis for sustainable bioprocesses, especially the biosynthesis of novel antibiotics and biopolymers. cospuri spermmania