Rhombognathus magnirostris magnirostris, from the Yale Peabody Museum of Natural History.

Belongs within: Halacaridae.

Rhombognathus is a genus of halacarid mites with minute palpi and two setae each on the ocular plates (Luxton 1990).

Characters (from Luxton 1990): Dorsal plates well developed; ventral plates often fused; ocular plates each with two setae; genital opening of female ventral; legs bidactylous; sclerite between end of leg and base of claws rod-like.

<==Rhombognathus Trouessart 1888 [incl. Aletes Lohmann 1889 nec Rafinesque 1815 nec Carpenter 1857 nec Chapuis 1874] N47
    |--*R. notops (Gosse 1855) (see below for synonymy) N47
    |--R. apsteini Lohmann 1907 N47
    |--R. biscutatus Bartsch 1993 H98
    |--R. caribaeus Bartsch 2007 B07
    |--R. foveolatus Bartsch 1993 H98
    |--R. fractus Bartsch 1979 L90
    |--R. gressitti Newell 1967 [incl. R. magnirostris var. lionyx Trouessart 1914] SL71
    |--R. intermedius Schulz 1933 N47
    |--R. lacunosus Bartsch 1979 L90
    |--R. latens Bartsch 1993 H98
    |--R. latibulus Bartsch 1993 H98
    |--R. lepidus Bartsch 1993 H98
    |--R. leurodactylus WL09
    |--R. levigatoides DPD16
    |--R. magnirostris Trouessart 1889 B07 [=R. magnipalpus (l. c.) N47]
    |    |--R. m. magnirostris N47
    |    |--R. m. plumifer Trouessart 1889 N47
    |    `--R. m. praegracilis Viets 1939 N47
    |--R. marginalis Bartsch 1993 H98
    |--R. novaezelandicus Bartsch 1986 L90
    |--R. parvulus Viets 1939 N47
    |--R. pectinatus Viets 1936 B07
    |--R. peltatus Viets 1939 B07
    |--R. placidus Bartsch 1993 H98
    |--R. psammophilus Bartsch 1993 H98
    |--R. pseudolionyx Newell & AndrĂ© 1959 B07
    |--R. reticulatus WL09
    |--R. scutulatus Bartsch 1983 H98
    |--R. sphaerorhynchus Police 1909 N47
    |--R. spinipes Viets 1933 N47
    |--R. thalassinus Bartsch 1993 H98
    |--R. uniscutatus Viets 1939 N47
    `--R. validipes Bartsch 2000 B07

*Rhombognathus notops (Gosse 1855) [=Pachygnathus notops, *Aletes notops; incl. A. gracilis Lohmann 1889, Rhombognathus longirostris Lohmann 1889] N47

*Type species of generic name indicated


[B07] Bartsch, I. 2007. Rhombognathus from the Caribbean area, with the description of a new species (Arachnida, Acari, Halacaridae). Senckenbergiana Biologica 87 (1): 17–22.

[DPD16] Dabert, M., H. Proctor & J. Dabert. 2016. Higher-level molecular phylogeny of the water mites (Acariformes: Prostigmata: Parasitengonina: Hydrachnidiae). Molecular Phylogenetics and Evolution 101: 75–90.

[H98] Halliday, R. B. 1998. Mites of Australia: A checklist and bibliography. CSIRO Publishing: Collingwood.

[L90] Luxton, M. 1990. The marine littoral mites of the New Zealand region. Journal of the Royal Society of New Zealand 20 (4): 367–418.

[N47] Newell, I. M. 1947. A systematic and ecological study of the Halacaridae of eastern North America. Bulletin of the Bingham Oceanographic Collection 10 (3): 1–232.

[SL71] Spain, A. V., & M. Luxton. 1971. Catalog and bibliography of the Acari of the New Zealand subregion. Pacific Insects Monograph 25: 179–226.

[WL09] Walter, D. E., E. E. Lindquist, I. M. Smith, D. R. Cook & G. W. Krantz. 2009. Order Trombidiformes. In: Krantz, G. W., & D. E. Walter (eds) A Manual of Acarology 3rd ed. pp. 233–420. Texas Tech University Press.

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