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This study proposes a multimodal deep learning model, Residual Multi\u2010Feature Attention\u201050 (ResMFA50), that integrates photomicrographs and small subunit ribosomal RNA (SSU rRNA) gene sequences of flagellates. The dual\u2010branch architecture (DNA sequence and image branches) extracts local and global features, while the Multi\u2010Feature Attention (MFA) mechanism dynamically fuses heterogeneous data. Experiments were conducted on a dataset comprising 296 SSU rRNA gene sequences and 308 standardized photomicrographs, evaluated using 10\u2010fold cross\u2010validation. The results demonstrate that ResMFA50 achieves an accuracy of 92.5% in classifying flagellates at a batch size of eight, which is significantly higher than the accuracies achieved by SVM (82.4%), Random Forest (84.2%), EfficientNet (83.6%), ResNet50 (87.4%), and MMNet (91.3%). Moreover, ablation experiments comparing early, intermediate, and late fusion strategies demonstrate that the proposed late fusion scheme consistently outperforms other fusion timings, achieving improvements of 3.2%\u20133.8% over early fusion across different batch sizes. This study establishes a methodological foundation for modelling multimodal biological data in complex systems, advancing deep learning applications in integrative taxonomy. This advantage is attributed to the dual\u2010channel global pooling mechanism (Global Average\/Max Pooling fusion), which balances the variance\u2010bias trade\u2010off through complementary strategies of spatial statistical smoothing and local salient feature detection, enhancing robustness to data scale expansion.<\/jats:p>","DOI":"10.1111\/1755-0998.70190","type":"journal-article","created":{"date-parts":[[2026,8,12]],"date-time":"2026-08-12T00:46:35Z","timestamp":1786495595000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Accurate Identification of Key Groups of Microeukaryotes Using Multimodal Deep Learning: An Integrated Classification Model Combining Morphological and Molecular Data"],"prefix":"10.1111","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5004-1343","authenticated-orcid":false,"given":"Yumeng","family":"Song","sequence":"first","affiliation":[{"name":"Key Laboratory of Biodiversity of Aquatic Organisms Harbin Normal University  Harbin P. 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