Description of Cornigamasus allotritosternus sp. nov. (Mesostigmata: Parasitidae) from China, with an emphasis on the ontogenetic development of setae Yao, Mao-Yuan Guo, Jian-Jun Yi, Tian-Ci Jin, Dao-Chao Zootaxa 2020 2020-08-03 4821 3 462 486 Evans & Till, 1979 Evans & Till 1979 [238,654,799,825] Arachnida Parasitidae Cornigamasus GBIF Animalia Mesostigmata 1 463 Arthropoda genus    Typespecies:  Gamasus coleoptratorum var. lunaris  Berlese, 1882   Diagnosis.Female and deutonymph with separated podonotal and opisthonotal shields, male with holodorsal shield, a transverse suture in central region. Setae z5of dorsal hexagon markedly different in form from j5and j6, usually thick, long and pilose distally. Tritosternum of female and deutonymph normal, but absent or biramous in male, if biramous, base reduced. Metasternal shields in female separated from sternal shield by an oblique suture. Genital shield of female triangular. Opisthogaster with rarely more than 15 pairs of setae. Seta alof palp femur setose, spiculate or rod-shaped, setae al1and al2of palp genu spatulate distally. Corniculi long and parallel, extending beyond anterior margin of palp trochanter, grooved to accommodate ‘salivary’ styli. Legs without spurs except for leg II of male.  Notes.The diagnosis of  Cornigamasusis based on the definition by Hyatt (1980). The most important difference is that the tritosternum of the male, which is absent in known species ( Hyatt 1980; Ma 1986; Skorupski & Witaliński 1997), is biramous with a degenerated base in  C. allotritosternus  sp. nov.. Therefore, the genus diagnosis is modified slightly to accommodate  C. allotritosternus  sp. nov..