Folsomia trisetata Jordana & Ardanaz, 1981 (Fig. 5) Folsomia sexoculata trisetata Jordana & Ardanaz, 1981: 41. MATERIAL EXAMINED. — Spain • 4 ♀, 1 ♂, on slide; SSD-14, slides 07, 08 and 13; Ortuño et al. leg; MZNA. REMARKS Until now, the distribution of this species was limited to the Pyrenean and pre-Pyrenean area (Potapov 2001), although it has been found in the Cantabrian Mountains (Santamaría et al. 2012). This new record adds a new biotope for the species, also in the mountains, but in the center of the Iberian Peninsula. The diagnostic characteristics are totally coincident with the original: antenna (Fig. 5A), head (Fig. 5B) and general chaetotaxy (Fig. 5 C-E). Confirmation of the identity of the specimens found in the Sierra de Guadarrama was performed by comparing them with the type series specimens, and based on the presence of the three special long sensilla of the Abd V, which, in this case, are blunt (Fig. 5C, F), and the sensory chaetotaxy given by Potapov (2001), which is identical (Fig. 5F). Since Potapov (2001) pointed out that this could be a synonym of F. trisetata due to the coincidence of the manubrial chaetotaxy (13 chaetae on F. sexoculata var. iberica Steiner, 1958 and 11- 12 F. trisetata), it would be necessary to study Steiner’s material (because at least seven Folsomia species have 13 chaetae in the manubrium ventral side).

Published as part of Baquero, Enrique, Jordana, Rafael & Ortuño, Vicente M., 2021, Distinctive Collembola Communities in the Mesovoid Shallow Substratum: Entomobryomorpha of the Sierra de Guadarrama National Park (Central Spain), pp. 37-78 in Zoosystema 43 (3) on page 44, DOI: 10.5252/zoosystema2021v43a3, http://zenodo.org/record/4487162