Incidental notes on some Grassatorean (Arachnida: Opiliones) types of the Senckenberg Naturmuseum (SMF) harvestmen collection Author Pérez-González, Abel Museo Argentino de Ciencias Naturales “ Bernardino Rivadavia ”, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Ángel Gallardo 470, C 1405 DJR, Buenos Aires, Argentina Author Ayala-Apaza, Arli G. Departamento de Entomología, Museo de Historia Natural, Universidad Nacional Mayor de San Marcos, Av. Arenales 1256, Jesús María 15072, Lima, Perú Author Pereira, Maria Paula Museo Argentino de Ciencias Naturales “ Bernardino Rivadavia ”, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Ángel Gallardo 470, C 1405 DJR, Buenos Aires, Argentina text Zootaxa 2024 2024-02-01 5405 4 591 598 http://dx.doi.org/10.11646/zootaxa.5405.4.7 journal article 287344 10.11646/zootaxa.5405.4.7 a3363a9d-3270-466f-8e27-27e116cdecdd 1175-5326 10603877 FC7BA5C2-FC50-4566-A46E-8F42BF6672AB Family Agoristenidae Type name: Micrisaeus gracillimus Roewer, 1957 . Specimen examined: Holotype SMF 9911421 - RII/11421-4 ( Fig. 7 ), from PERU , Ucayali , Rio San Alejandro. Actions : New allocation to family Agoristenidae . FIGURE 7 . Micrisaeus gracillimus Roewer, 1957 , holotype SMF 9911421-RII/11421-4. A: dorsal view. B: label. Scale bar: 1mm. Up label text: 1 Palp lose. Down label text: Arachn. Coll. Rwr. - Lfd. No. 11421. Opil.: Phalangodinae, No. 250, Micrisaeus gracillimus Rwr, Genotypus , 1♀, Peru: Rio San Alejandro, 300m. Weyrauch leg., Rwr. det. 1956. Remark (I): Roewer (1957) originally described this genus and species as a member of Phalangodidae : Phalangodinae, but it was later removed to Grassatores incertae sedis by Kury (2003) . Herein we propose the new transfer of this species from Grassatores incertae sedis to the family Agoristenidae (Gonyleptoidea) . The habitus and the characteristically thinner leg I relative to all other legs ( Fig. 7A ) (see Šilhavý 1973 for further morphological characteristics) leave no doubts about the family transference. The visit to the SMF harvestmen collection yielded some important incidental observations that allowed us to propose two family transfers, determine the correct sex for six types , and designate one lectotype . We encourage other colleagues to publish their incidental observations as correspondences or short notes, to avoid the possibility that they will remain forever as unpublished data .