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Hirudinea of the genus Helobdella from Curaçao and Venezuela Naturalis
Dresscher, Th.G.N.; Engel, H..
Two species of leeches only have been collected by dr HUMMELINCK in 1936—1937, but these are important as they evidently prove the occurrence in warm tropical waters of species hitherto only recorded from non-tropical areas. Helobdella scutifera is distinguished from H. stagnalis by AUTRUM, 1936, p. 26 and 34, though PAWLOWSKY (cf. AUTRUM 1939, Bronns Kl. u. Ordn., Hirudineae 2, p. 500) considered them synonymous. AUTRUM (l. c. p. 500 and footnote) remarks that H. stagnalis is not known from tropical localities, supposing the habitats in Ecuador, Brasil and Paraguay perhaps to be non-tropical because of their particular position. Our material, however, shows affinities to both species and tends to affirm the identity of H. stagnalis and H. scutifera. It is...
Tipo: Article / Letter to the editor
Ano: 1948 URL: http://www.repository.naturalis.nl/record/506160
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Neue Fundorte und Variabilität der Xerobdella anulata Autrum, 1958 (Hirudinea, Haemadipsidae) Naturalis
Dresscher, Th.G.N.; Engel, H.; Spoel, S. van der.
Es wird Xerobdella-Material aus 11 neuen Fundorten in Jugoslawien erwähnt. Wir wissen leider noch nicht genug über die Variabilität der beiden Xerobdella-Arten (X. lecomtei und X. anulata) um mit Sicherheit sagen zu können ob hier zwei Arten oder zwei Subspecies einer Art vorliegen. Je mehr Exemplare bekannt werden, desto grösser erscheint die Variabilität. Es ist nicht sicher ob wirklich bei allen als X. lecomtei beschriebenen Tieren genau die Zahl der Ringe zwischen den Genitalöffnungen gezählt worden ist. Unsere Exemplare zeigen 4 bis 5 Ringe, während Autrum nur 4½ Ringe für X. anulata angab, dagegen 3 bis 3½ Ringe für X. lecomtei. Vorläufig nennen wir unsere Tiere darum Xerobdella anulata Autrum, 1958, die vermutlich südlich der Julischen Alpen vorkomme.
Tipo: Article / Letter to the editor
Ano: 1966 URL: http://www.repository.naturalis.nl/record/505169
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Trocheta bykowskii Gedroyć, 1912, in the Netherlands Naturalis
Dresscher, Th.G.N.; Engel, H..
Recently, while collecting Hirudinea in the Netherlands we came across the species Trocheta bykowskii GEDROYĆ, 1912 (syn. Blanchardia bykowskii GEDROYĆ, 1916). The genus Trocheta was described by DUTROCHET in 1817. The only European species he mentions is Trocheta subviridis, one of the larger leeches, the length of this animal in rest being 80-140 mm.
Tipo: Article / Letter to the editor
Ano: 1955 URL: http://www.repository.naturalis.nl/record/505218
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