Paul Martens

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Ten species of the Monocelidinae have been examined. All were found to be regularly diploid. Four of them show the chromosome number n=3 and remarkably similar karyotypes (one pair of large metacentrics, one pair of medium sized metacentrics and one pair of small heterobrachial chromosomes). This set is considered as basic (plesiomorphic) for the family(More)
Recent data and opinions on meiofaunal ecology are briefly reviewed; and from scattered data, the place of turbellarians in the meiobenthic community is discussed. Turbellarian diversity, density, and biomass are higher in sandy habitats than in muddy bottoms. In sand, turbellarian diversity is of the same magnitude as that of other important meiofaunal(More)
Two new Archilopsis species are described: Archilopsis marifuga sp.n. and Archilopsis arenaria sp.n.; Archilopsis unipunctata (Fabricius, 1826) and Archilopsis spinosa (Jensen, 1878) are redescribed. The latter taxon is re-established. The descriptions are based on morphological and karyological data. The four species of the genus can unequivocally be(More)
The current classification system for the Monocelididae which is based on the character "presence or absence of an accessory prostatoid organ" divides the family into two subfamilies, namely the Minoninae and the Monocelidinae. However, other characters relating to the structure of the male copulatory bulb and to karyotypes do not support this division.(More)
Five new species of the new taxon Brunetorhynchus n. gen. are described: B. deconincki n. sp., B. microstylis n. sp. and B. complicatus n. sp. are from the Mediterranean, B. canariensis n. sp. is from the Canary Island Lanzarote, B. cannoni n. sp. is from the Australian East coast and one species from the Galapagos, formerly described as Limipolycystis(More)
Sand dwelling Turbellaria from the Delta of the Rivers Rhine, Meuse and Scheldt have been investigated. Thirty-eight samples taken from littoral and sublittoral stations in the Grevelingen, Eastern and Western Scheldt have been analysed. Thirty-three species were recorded (Acoela were not considered); twenty-four of them are new for the area and seven new(More)
Of the seven genera which we have recognised within the Archiloa genus complex sensu Karling (1966) the cosmopolitan genus Archilina is the most ‘primitive’ and is characterised only by plesiomorphic characters, and has to be considered paraphyletic. All other species of the Archiloa genus complex are hypothesized to be derived from Archilina-like ancestors(More)
Two new species of PromonotusBeklemischev, 1927 from the Mediterranean (P. sphaerobursa n. sp. and P. spinosissimus n. sp.) are described, and the whole genus is revised. The monophyly of the genus, characterized by the absence of a vagina externa, is questioned. Based on the morphology of the copulatory organ, the existence of apomorphies shared by most of(More)
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