Speciation traits of paramere, paraproct and aedeagus were applied to find initial split criteria with fine structure analysis in order to prepare diverged trait matrices for delimiting phylogenetic incipient species of unsettled limnephilid taxa in the early stages of reproductive isolation. A brief history is presented how this phenotypic taxonomic tool of the speciation traits was discovered and applied in caddisfly taxonomy. The theoretical basis was elaborated for the phenotypic speciation trait by reviewing several relevant topics in the sciences of taxonomy, molecular genetics and phylogenetics. Perspectives of integrative taxonomy is discussed in context of phenotype versus genotype, immensely complex phenotype versus phenomic challenge, taxonomic impediment versus genetic expedient, taxonomic adaptation of genetic vocabulary versus genetic sophistication and virtualization, New Systematics of Huxley and Mayr versus New Taxonomy of Wheeler. Debates on magic trait, speciation phenotype, speciation trait and super traits are discussed concluding that evolution works with phenotype and why the cryptic species concept is irrelevant. Briefly summarized how speciation traits evolve in sexual selection, through accelerated reproductive isolation with genital evolution through sex-limited speciation traits, including minor sex chromosomes. Why neutral molecular markers are blind compared to the adaptive speciation traits sensitized by fine structure analysis and backed by the potential of high-tech and high-throughput phenotyping and cyber-infrastructure broadly accessible and fed by computable phenotype descriptions. What sort of genetics could really help taxonomy to describe biodiversity of the over 100 million unknown taxa? Collecting new and re-examining old type materials deposited in various collections, the following taxonomic actions were elaborated by speciation traits. Drusus bolivari new species complex has been erected with redescription of Drusus bolivari (McLachlan, 1876), with species status resurrection of D. estrellensis (McLachlan, 1884) stat. restit., with description of five new species: D. carmenae Oláh, sp. nov., D. gonzalezi Oláh, sp. nov., D. grafi Oláh, sp. nov., D. gredosensis Oláh, sp. nov., D. jesusi Oláh, sp. nov., D. pyrenensis Oláh & Coppa, sp. nov. Genus Isogamus is revised with description of two new species: I. baloghi Oláh, sp. nov., I. balinti Oláh, sp. nov. Melampophylax genus revised with one new species cluster: M. nepos, with two new species descriptions: M. keses Coppa & Oláh, sp. nov. M. szczesnyorum Oláh & Chvojka, sp. nov., with three new species status: M. banaticus Botosaneanu, 1995 stat. nov., M. gutinicus Botosaneanu, 1995 stat. nov., M. triangulifera Botosaneanu, 1957 stat. nov. Rhadicoleptus genus revised with redescription of R. alpestris (Kolenati, 1848), with three new species status: R. macedonicus Botosaneanu & Riedel, 1965 stat. nov. R. meridiocarpaticus Botosaneanu & Riedel, 1965 stat. nov. R. sylvanocarpaticus Botosaneanu & Riedel, 1965 stat. nov., with one species status resurrection: R. spinifer (McLachlan, 1875) stat. restit. Based on paramere evolution the Rhadicoleptus genus is transferred from the tribe Limnephilini to Stenophylacini. Annitella kosciuszkii new species complex has been erected and revised with redescription of A. chomiacensis (Dziędzielewicz, 1908), A. lateroproducta (Botosaneanu, 1952), with one species status resurrection: A. kosciuszkii Klapálek, 1907 stat. restit., with description of a new species: A. wolosatka Oláh &Szczęsny, sp. nov., with two new synonyms: A. dziedzielewiczi Schmid, 1952 synonym of A. kosciuszkii. syn. nov., A. transylvanica Murgoci, 1957 synonym of A. kosciuszkii. syn. nov. Chaetopteryx rugulosa species group revised with description of five new species: C. balcanica Oláh, sp. nov., C. karima Oláh, sp. nov., C. kozarensis Oláh, sp. nov., C. psunjensis Oláh, sp. nov., C. tompa Oláh, sp. nov., with three species status resurrections: C. papukensis Oláh & Szivák, 2012 stat. restit., C. prealpensis Oláh, 2012 stat. restit., C. zalaensis Oláh, 2012 stat. restit. Psilopteryx psorosa new species group erected and revised with three new sibling species complexes: P. bohemosaxonica, P. carpathica, P. psorosa, with two new species descriptions: P. javorensis Oláh, sp. nov., P. harmas Oláh & Chvojka, sp. nov. with one species status resurrection: P. carpathica Schmid, 1952 stat. restit., with three new species status: P. bohemosaxonica Mey & Botosaneanu, 1985 stat. nov., P. retezatica Botosaneanu & Schneider, 1978 stat. nov., P. transylvanica Mey & Botosaneanu, 1985 stat. nov.