Folsomia inoculata is a rare species that has only been recorded from three localities in Britain and Ireland. It is white with 0+0 ocelli and reaches a maximum length of 2.0 mm. The ratio of the length of the longest setae at the tip of the abdomen/length of mucro is between 2.5 and 2.8. The manubrium has 2+2 or 2+3 apical ventral (anterior) setae arranged longitudinally (Fig. 1). The dens has 8-12 ventral (anterior) setae and 4 dorsal (posterior) setae (3 at the base of the dens and one seta in the middle which is sometimes absent). The PAO is narrow and constricted and is slightly longer than the width of ant1 (Fig. 2). A characteristic feature is that the apical pair of posterior setae on the ventral tube are much longer than the others (Fig. 3).
     The only
Folsomia inoculata that I have seen were 'hiding' among specimens labelled as Folsomia 'spinosa' in the NHML slide collection. There are 34 individuals (on four slides) collected in January 1964 from Pullwyke Bay, Windermere. They agree in all respects with the description of Folsomia inoculata by Potapov (2001), and are definitely not Folsomia spinosa.

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Fig. 1 (above): Furca of Folsomia inoculata collected from Pullwyke Bay, Windermere in January 1964 by M.E. Bacchus. The manubrium (ma) has 2+2 apical ventral (anterior) setae arranged longitudinally (*). d, dens; mu, mucro.

Fig. 2 (above): Post-antennal organ (PAO) of Folsomia inoculata collected from Pullwyke Bay, Windermere in January 1964 by M.E. Bacchus.

Fig. 3 (above): Folsomia inoculata collected from Pullwyke Bay, Windermere in January 1964 by M.E. Bacchus.The apical pair of posterior setae (arrows) on the ventral tube (VT) are much longer than the others