After the introduction of Gammarus tigrinus in The Netherlands some 25 years ago and of other recently invading amphipods (Crangonyx pseudogracilis and Corophium curvispinum) the native species decreased, the invaders increased. The success of these invaders and its impact on the local amphipod fauna is discussed. Electrophoretic tests give evidence that a second invasion of Gammarus tigrinus, this time from Germany, is taking place. Some predictions about future developments are made.
Sjouk Pinkster, Maarten Scheepmaker, Dirk Platvoet and Nico Broodbakker
A new species of the ostracode genus Eusarsiella (Myodocopida, Sarsiellidae) is described from a marine lava tube in Lanzarote (Canary Islands) and compared with other species known to occur in the same geographical area. Eusarsiella bedoyai n. sp. is the second species in that genus described from anchialine caves. Its importance in determining the origin of the stygobiont fauna is briefly discussed.
Caroline C. Hofman and Margriet Kielman
From June till December 1987 an inventory of the excavating sponges of the Santa Marta area, Colombian Caribbean, was made by scuba diving to depths not exceeding 18 m. Sixteen species were recorded and compared morphologically,using spicule sizes, papillae shapes, and excavation characteristics. Four little-known species are fully described and illustrated by submarine color photographs in situ. One appears to be a new species: Axinyssa flavolivescens, belonging to a genus not known to excavate so far. The other three species could not be identified with certainty: Aka aff. xamaycaensis, Aka aff. brevitubulata, and Cliona aff. flavifodina. A key to the excavating sponges of the area studied is provided.
Thomas E. Bowman and Lazare Botosaneanu
A corallanid isopod in the manca stage (lacking pereopod 7), collected from alluvial gravel along the Batui River in Sulawesi, Indonesia, and identified questionably as Tachaea lacustris Weber, 1892, is illustrated and described in detail. Tachaea lacustris was known previously only from freshwater lakes in Sumatra and Java. Its presence in river alluvial gravel should not be interpreted as possible adaptation to the hyporheic habitat.
Seven species of Tubificidae are recorded from the Canary Islands, viz. Heterodrilus amplus n. sp., Coralliodrilus leviatriatus Erséus, 1979, Limnodriloides agnes Hrabě, 1967, L. janstocki n. sp., Aktedrilus cuneus Erséus, 1984, A. parvithecatus (Erséus, 1978), and Tubifex tubifex (Müller, 1774); the two latter taxa are reported also from the Cabo Verde Islands. All taxa except T. tubifex are marine and there is no evidence of endemism in the freshwater oligochaete fauna of these islands. Heterodritus amplus has short, spindle-shaped, heavily muscular atria; they are morphologically unique within the genus. Limnodriloides janstocki has modified spermathecal setae; it is distinguished from similar species by its long atrial ducts and deep, elaborate copulatory sacs.
Jean-Paul Henry and Guy Magniez
Samples collected in underground waters of Spain by Ine Meijers and Jos Notenboom demonstrated the presence of some oculated asellids previously known: Proasellus coiffaiti, P. coxalis, and P. meridianus, and also four new stygophilous species, more or less depigmented, with different stages of regression of the ocular system: P. beticus n. sp., P. ortizi n. sp., P. aragonensis n. sp., and P. ebrensis n. sp. These forms represent relict populations of ancient epigean species. The anophthalmous species of the Aquitanian Basin, Pyrenees, and Iberian Peninsula are more closely related to P. beticus and P. ortizi than to the Recent epigean species P. coxalis and P. meridianus.
Jean Nicolas Sébastien Allamand (1713–1787), working in Holland, wrote 41 articles about mammals which were not, or only insufficiently, treated by the Count of Buffon in his Histoire naturelle. Allamand’s contributions first appeared between 1769 and 1781 in various volumes of a French edition of the Histoire naturelle published by J. H. Schneider in Amsterdam. These additional articles are analysed to recognize the sources available to Allamand. The new information was mainly derived from animals seen at fairs in Holland, at the inn Blauw Jan in Amsterdam, in the menagerie and museum of Stadholder Willem V near The Hague, in the museum of the University of Leiden, and from observations made in South Africa by R.J. Gordon.
The brachycentrids are represented in India by only two genera. The only species of Brachycentrus is distributed all along the Himalayan Range. Micrasema is represented by twelve species, ten of which are presently described as new. A few short taxonomic and phyletic considerations are also given.
Jan H. Stock
Sixteen species of Pycnogonida are recorded from littoral or very shallow waters (0-3 m) of the coast of Oman. Four species are new to science: Ammothella omanensis, Achelia boschi, A. lagenaria, and Pycnogonum moolenbeeki. Since up to now no littoral Pycnogonida have been recorded from the Arabian peninsula, all other species are new to this region, with the exception of one which was recorded from deeper waters off Oman before. For some of them the range is considerably extended.