THE HALACARID GENUS LOHMANNELLA (HALACARIDAE, ACARI): LIST OF SPECIES, NOTES ON CHARACTERS, DISTRIBUTION, ECOLOGY AND A TABULAR KEY

About author:

Ilse Bartsch, Forschungsinstitut Senckenberg, Hamburg, Germany

Acknowledgments:

I am grateful to the Deutsches Elektronen-Synchroton (DESY), Hamburg, for offering me workspace in the institution. I would also like to thank Dr. H. Dastych and Dr. N. Dupérré (Arachnology Collection, Zoologisches Museum, Hamburg (Leibniz-Institut zur Analyse des Biodiversitätswandels)), Dr. T. Kronestedt (Naturhistoriska Riksmuseet, Stockholm) and Dr. P. Jäger and Dr. J. Altmann (Senckenberg Institut und Museum, Frankfurt am M.) for loaning me the slides deposited in the halacarid collections.

Annotation:

Presently, 39 Lohmannella species are accepted as valid, but future examinations may prove some of them to be junior synonyms of others. This article lists the most important descriptive papers, as well as the former names for each of the 39 species. The characters of another five species, known by their adults, are outlined but not given a name. Based on the published data, short diagnoses as well as notes on the distribution and habitats are added. In addition, the poorly known female of Lohmannella bihamata is described and illustrated. This article provides a table of morphological characters that are meant to facilitate the identification of Lohmannella species. The genus Lohmannella is spread worldwide, inhabiting all water depths and all climatic zones; its representatives live in marine and fresh water. Although the majority of Lohmannella species have been found at sea, five species have been recovered from fresh or slightly brackish water. In the following sentences, the number of unnamed species is given in square brackets. Records of 33 [plus two] marine species are exclusively from the littoral and/or bathyal zone (0–1,000 m deep); records of three [plus three] species are from the deep sea (deeper than 1,000 m); and one record is from the littoral / deep sea depth range. Most species have been found in the temperate and polar areas: namely, 12 [plus two] have been recorded north of 23°N and 20 south of 23°S. The data from the tropics include a single shallow water (0–200 m deep) record, one unnamed species from the 400–520 m depth and one [plus two] species from the depth of more than 1,000 m. Most southern hemisphere shallow water species are morphologically distinct from the bathyal and abyssal species, as well as from the northern hemisphere species.

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