Genus Calyptomastix Hoffman & Howell, 2012 Type species Odontopyge kakandae Kraus, 1958 (D.R. Congo), by original designation. Other included species Seven, including four new species described here, see Hoffman & Howell (2012). Diagnosis Differs from other genera of Prionopetalini by the combination of the elongated basal whorl of the gonopodal torsion (torsotope) and the resultant wide separation of the coxal regions, plus the nearly complete concealment of the solenomere within laminae of the telomere. Remarks The four previously known species are distributed in D.R. Congo and Tanzania. One of these, C. kakandae (Kraus, 1958a), originally described from D.R. Congo, occurs close to the Eastern Arcs, west of the Tanzanian southern Highlands (Rukwa Region, Sumbawanga District) (Hoffman & Howell 2012). The new species here assigned to Calyptomastix share “the elongated basal whorl of the gonopod torsion” (torsotope) and the “nearly complete concealment of the solenomere with laminae of the apical “calyx” (= tarsus [= telomere])”. Hoffman & Howell (2012) did not comment on the limbus of Calyptomastix species; however, the limbuses seen in three of the new species (Figs 15F, 17D, 21D) with their triangular marginal lobes are similar to that seen in in type species, C. kakandae (Kraus, 1958), as well as in two of the three other species assigned to the genus: C. leviceps (Attems, 1909) and C. pardalis (Gerstäcker, 1873) (Attems 1909a: fig. 34, 1914: fig. 223; Kraus 1958a: 61). The limbus of C. dorsalis (Carl, 1909) has not been described, and that of C. xystopygoides sp. nov. (Fig. 19D–E) escapes comparison because of wear.

Published as part of Enghoff, Henrik, 2022, Mountains of millipedes. The family Odontopygidae in the Eastern Arc Mountains of Tanzania (Diplopoda, Spirostreptida), pp. 1-136 in European Journal of Taxonomy 803 on page 25, DOI: 10.5852/ejt.2022.803.1691, http://zenodo.org/record/6359066