TABLE 2 in Revision of Megalothorax incertus Börner, 1903 reveals it to be another widespread Palearctic species of the genus (Collembola, Neelidae)

TABLE 2. Differential diagnosis of the closest relatives of M. incertus sensu nov.
CharacterM. incertus sensu nov.M. boerneri sp. nov.M. perspicillumM. laevisHead dorsal anterior channelsabsentabsentabsentsimpleTrunk lateral and dorsal channelsabsentabsentwell developedabsentTh. II chaetae a3 (adult)absentpresentpresentpresentAbdominal chaetae ζ4absentpresentpresentpresentAbdominal chaetae β4absentpresentabsentabsentFemale genital plate, number of chaetae2 + 23 + 32 + 22 + 2Abd. IV sternite, number of chaetae (adult)2 + 23 + 33 + 32 + 2Manubrium, number of chaetae2 + 21 + 12 + 22 + 2MucroserratedserratedserratedsmoothRetinaculum, number of teeth3 + 34 + 44 + 44 + 4