Pseudoscorpiones (Arachnida) in phoretic association with Passalidae (Insecta, Coleoptera) in the Amazon State, Brazil

Pseudoscorpions were collected nocturnally at the upper Urubu River, Amazonas, Brazil, using artificial light, at monthly intervals between January 1982 and December 1983. 312 specimens of phoretic species, in three families, were collected from twelve species of passalid beetles. The pseudoscorpions collected were Tridenchthonius mexicanus CHAMB. & CHAMB., 1945 (Tridenchthoniidae) , Lustrochernes intermedius (BALZAN, 1891), Lustrochernes aff. reimoseri BEIER, 1932, and Americhernes aff. incertus MAHNERT, 1979 (Chernetidae), and Parawithius (Victorwithius) gracilimanus MAHNERT, 1979 (Withiidae). Observations on the phoretic behavior of each pseudoscorpion species, the frequency of individuals per carrier, their monthly occurrences, and the relative abundance of males, females and tritonymphs, the occurrence of females with brood sacs, and the frequency of each passalid beetle species with or without pseudoscorpions, are reported and discussed

Key to the families of Amazonian Pseudoscorpiones (Arachnida) (in English, German and Portuguese)

A detailed and well illustrated key is given for 12 families of Pseudoscorpiones recorded from Amazonia

Dolichowithius mediofasciatus MAHNERT, 1979 (Arachnida, Pseudoscorphiones, Withiidae) phoretic on Platypodidae (Insecta, Coleoptera), in the Amazon State, Brazil

Seven specimens of Dolichowithius mediofasciatus MAHNERT (one female, two males and four tritonymphs) were collected, each attached to the abdomen of Platypus sp. (Platypodidae). Female beetles were caught with a Pennsylvania light trap, while males were collected with an attraction/interception trap. Both were installed in the vicinity of Manaus (Amazonas), from September 1987 until January 1990. Another twenty-nine specimens of D. mediofasciatus (nine males, ten females and ten tritonymphs), are supposed to be phoretic as they were found in the trap bottles with preservative solution (alcohol). The pseudoscorpions occurred more frequently during the rainy season, mainly between December and January

Fig. 1 in A new genus and species of characid fish from the Amazon basin - the recognition of a relictual lineage of characid fishes (Ostariophysi: Cheirodontinae: Cheirodontini)

Fig. 1. Holotype of Amazonspinther dalmata, new species, MCP 38623, undetermined sex, 19.63 mm SL.Published as part of Bührnheim, Cristina M., Carvalho, Tiago P., Malabarba, Luiz R. & Weitzman, Stanley H., 2008, A new genus and species of characid fish from the Amazon basin - the recognition of a relictual lineage of characid fishes (Ostariophysi: Cheirodontinae: Cheirodontini), pp. 663-678 in Neotropical Ichthyology 6 (4) on page 664, DOI: 10.1590/S1679-62252008000400016, http://zenodo.org/record/456715