Wolfgang Joost

Populationen Von Triops Cancriformis (Bosc) (Notostraca) in Deutschland Nördlich 50°n sInd Nicht Klonal Und Höchstens Fakultativ Hermaphroditisch

Populations of Triopsidae (Notostraca) exhibit a wide variation in sex ratio and, therefore, have received enormous interest. However, investigations focusing on this subject are often suffering from problems in discriminating males and females phenotypically. In the present study 29 individuals of Triops cancriformis found in two locations in Germany were characterized ethologically, morphologically, and histologically in order to investigate the reliability of the sex ratio of populations north of 50°N. Among ten distinct morphological characteristics the structure of the eleventh pair of legs turned out to be the only suitable one for discriminating the gender of (fixed) Triops material. This was confirmed by histological examination of the respective gonads. In total, three sexual males were found. Their sperms were round and non-flagellar, contained large nuclei, and showed no signs of degeneration. Histologically, there was no evidence for the occurrence of hermaphroditic individuals. These findings suggest that Triops cancriformis populations in Germany north of 50°N are not clonal and at best facultatively hermaphroditic. In conclusion, the results of the present study provide evidence for the occurrence of sexual Triops cancriformis males and females in European populations at latitudes beyond 50°N for the first time. Generally, this is the northernmost find of male Triops cancriformis in Europe and the first report of recent males in Middle Europe since 1955.

On a small collection of Psychodidae (Diptera) from Colombia

The following new Psychodidae were collected by W. Joost, during a visit in Colombia: Arisemus guhli spec, nov., Arisemus roessleri spec, nov., Arisemus obandoni spec, nov., Arisemus martinezi spec, nov., Psychoda bogotensis spec, nov., and Maruina colombicana spec. nov. In addition, Clogmia albipunctata (Williston), Tinearia alternata (Say), Paramormia spec, and Psychoda spec, were collected.

Description of the larva of Andogyrus buqueti (Aubé, 1838) (Coleoptera, Gyrinidae)

The larva of Andogyrus buqueti (Aube, 1838) is described in all instars. The larva shows characters which are typical for that of Enhydrini and Orectochilini. The closer relationship of Andogyrus Ochs could not be cleared through larval research.

Rhyacopsyche Mutisi n. sp. ‐ a new microcaddisfly with an unusual larva from Colombia (trichoptera, hydroptilidae)

Collecting of caddisflies in Colombia resulted in the discovery of an unde‐scribed species of Rhyacopsyche. The larvae and pupae were firmly attached with long, silken threads to stones in a mountain brook. The pupae were floating freely in the current. On the basis of pharate adults the species is described as Rhyacopsyche mutisi n. sp. The description provides an expanded definition of the genus.

To the occurrence of Andogyrus buqueti (Aubé, 1838) in Paramo de monserate near Bogotá, Colombia (Coleoptera, Gyrinidae)

From the six previously in Colombia reported Andogyrus species, A. buqueti (Aube, 1838) was proved. For this species details to the habitat and remarks on the behaviour of the egg‐morphology and on socialization with other streamdwellers are announced.

Further records of moth-flies (Diptera, Psychodidae) from the Armenian SSR

Joosttella caucasica Vaillant and Paramormia fratercula (Eaton) are recorded for thefirst time from the Armenian SSR. Jungiella monikae sp.n. is described and figured, and the differences to related species are discussed.