Lohmannellinae Viets, 1927

Abé, Hiroshi, 2021, Taxonomic review of the subfamily Lohmannellinae (Acari: Trombidiformes Halacaridae) with morphological comparisons among genera, Zootaxa 4980 (2), pp. 201-255: 207

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Lohmannellinae Viets, 1927


Subfamily Lohmannellinae Viets, 1927  

[Type: Lohmannella Trouessart, 1901   ]

Diagnosis. Idiosoma   obovoid. Four dorsal plates (AD, right and left OC, and PD) and four ventral plates (AE, right and left PE, and GA) fundamentally present, but OC occasionally reduced. Palpi slender, two- or four- segmented, and placed dorsally or laterally on the gnathosoma   base. Rostrum elongate, almost the same length as the palpi, and parallel-sided for most of the length. Lc developed, but median claw sometimes vestigial.

Remarks. The subfamily Lohmannellinae   was originally erected by Viets (1927a) to include two genera Lohmannella Trouessart, 1888   , and Scaptognathus Trouessart, 1889   . At that time, Porolohmannella violacea   was incorporated into Lohmannella   in the Viets’s system. Afterwards, the genus Porolohmannella   was established by Viets (1933) based on Porolohmannella violacea   as the type. At present, Lohmannellinae   consists of five genera: Lohmannella Trouessart, 1888   ; Porolohmannella Viets, 1933   ; Scaptognathus Trouessart, 1889   ; Scaptognathides Monniot, 1972   ; and Xenohalacarus Otto, 2000   . Bartsch (1996a) moved three freshwater species in the genus Porolohmannella   into Lohmannella   . Therefore, Porolohmannella   contains a single freshwater species and Lohmannella   consists of a large number of marine, brackishwater, and freshwater species. Scaptognathides   was established by Monniot (1972) based on Scaptognathides planus   as the type collected from the Bermudas. Xenohalacarus   was most recently erected by Otto (2000a) based on Xenohalacarus longirostris   as the type from the Queensland Plateau in Australia. At present, Xenohalacarus   contains a single species.

As mentioned before, Newell (1984) raised this subfamily to the familial rank Lohmannellidae   , which in those days included marine and freshwater genera with dorsally attached palpi on the base of the gnathosoma   . However, as Otto (2000b) mentioned, the dorsally attached palpi on the gnathosoma   would be considered a plesiomorphic state, because this characteristic spreads over various taxa in Acari   . Therefore, in the present paper, Lohmannellinae   retains its subfamilial rank, because positive evidence of the alteration could not be obtained under the existing circumstances. However, there still remains a possibility that the constituent of the subfamily will be changed depending on a phylogenetic tree-topology. Especially, as Otto (2000a) suggested, the assignment of Xenohalacarus   to Lohmannellinae   was tentative and the systematic position has not been verified in recent molecular phylogenetics. Further molecular phylogenetic work will be required before an explicable system can be attained.