Abstract
A new species, Dicranocentrus hainanicus Ren & Zhang, sp. n., is described from Hainan Province, China. Complete tergal chaetotaxy including microchaetae is illustrated and discussed. It is characterized by having the dental spines arranged in 2–3 rows, two inner teeth on unguis, 5, 2, 2 central macrochaetae on Abd. I–III, two inner S-chaetae on Abd. V displaced anteriorly, and the additional microchaetae associated with the S-chaeta acc.p6 on Th. II–Abd. II. It is most similar to D. chenae Ma, Chen & Soto-Adames but differs from the latter in the number and arrangement of dental spines and the absence of macrochaeta Pa1 on dorsal head. A key to the Chinese species of the genus is provided.
Highlights
The genus Dicranocentrus Schött, 1893 is widespread in pantropical regions
Mari-Mutt (1979) made great contribution to its biology, character assessments, and phylogeny, and further divided it into three groups based on dorsal cephalic chaetotaxy
Posterior macrochaetae on dorsal head are absent in marias-group, and macrochaeta S2 is present in sundanensis-group but absent in gracilis-group
Summary
Inner tibiotarsi and manubrium dorsally with smooth chaetae. Subcylindrical, thick S-chaetae 6–7, 3–4, 7 ventro-laterally on Ant Ib, IIb and III, respectively (Figs 15, 16).
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