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This is the first record for the species Vitalius roseus (Mello- Leitão, 1923) in Argentina. The present study expands the known geographic distribution of the species to western Uruguay River. Data on natural history and sexual behaviour of the species is provided.
Food exchange by the mother to her brood is a frequent phenomenon in social arthropods. In the subsocial spiders of the genus AnelosimusSimon, 1891, maternal regurgitation to offspring plays an important role in the survival of the colony. Regurgitations also occur between subadult males and females in Anelosimus vieraeAgnarsson, 2012. In order to examine the effects of supplementary food on the subadult male's development towards maturity, we carried out two types of trial: groups of subadult males and female siblings and non-siblings were weighed, and cephalothorax and leg I in adult males were measured. Our results suggest that the supplementary food obtained by males from sisters allows the acquisition of larger size. Besides weight gain, males fed by females reached larger sizes of leg I femur and tibia. Leg I could be important in intrasexual competition, given that males with larger legs are more likely to win agonistic encounters. This also has positive implications for access to females.
After detailed examinations of the male lectotype of Diplura erlandi (Tullgren, 1905) the type species of AchetopusTullgren, 1905 and comparisons with the earlier descriptions of this species, it is certain that the vial does not exclusively contain disarticulated components of a single specimen. It was not possible to identify the components separately so that the extraneous ones could be removed. The designation of a neotype is desirable. Notes on the use and distinction of scopula, entire scopula and divided scopula are included.
The erigonine linyphiid Erigone autumnalisEmerton, 1882 is reported from New Caledonia for the first time, based on a male specimen found in the collection of the American Museum of Natural History. Additionally, E. neocaledonicaKritscher, 1966 is redescribed based on the only known specimen, the holotype female. Brief descriptions and illustrations of the genitalia are included for both species.
Six species of spider (Arachnida: Araneae) are newly recorded from a series of localities in the eastern part of the Republic of the Sudan. Crossopriza pristina (Simon, 1890) (Pholcidae) was found at Tokar and New Halfa. These represent the first African records of this species. Hippasa cinereaSimon, 1898 (Lycosidae) was found at New Halfa, Pardosa onckaLawrence, 1927 (Lycosidae) and Wadicosa fidelis (O. Pickard-Cambridge, 1872) (Lycosidae) were both found in the Dinder National Park. Plexippoides flavescens (O. Pickard-Cambridge, 1872) (Salticidae) was found at New Halfa, and Pseudicius spiniger (O. Pickard-Cambridge, 1872) (Salticidae) — already known from South Sudan — is here reported from the Dinder National Park in the Republic. Additionally, we offer several new locality records for five species previously documented from the Republic of the Sudan. Afrofilistata fradei (Berland & Millot, 1940) (Filistatidae) was found at New Halfa, Ocyale pilosa (Roewer, 1960) (Lycosidae) was found in the Dinder National Park, Pardosa injucunda (O. Pickard-Cambridge, 1876) (Lycosidae) was found at New Halfa, Kassala, and in the Dinder National Park, Thomisus daradioidesSimon, 1890 (Thomisidae) at Khashm El-Gerba and at New Halfa, and Plexippus paykulli (Audouin, 1825) (Salticidae) at New Halfa, Kassala, and in the Dinder National Park.