Publication Date:
2024-01-12
Description:
During August 1961 I received from Mr. E. Roloff (Karlsruhe, Germany), a well-known aquarist, three specimens of an unidentified Rivulus. The specimens were collected by Mr. Roloff during his journey to Ecuador early 1961. The sampling place is described by him in the followinig words: \xe2\x80\x9eDie Rivulus stammen aus einem kleinen, sehr schattigen Bach, der in die Lagune von Limoncocha m\xc3\xbcndet. Das Wasser ist sehr weich (etwa 1\xc2\xb0 DH) und hat eine Temperatur von etwa 26\xc2\xb0 Celcius, die sich nat\xc3\xbcrlich zeitweilig noch erh\xc3\xb6ht. Der Bach ist nur etwa 1 Meter breit und hat einen geringen Wasserstand, oft nur 20 bis 25 cm. Die Rivulus halten sich haupts\xc3\xa4chlich zwischen den Baumw\xc3\xbcrzeln und den hineingefallenen Zweigen auf. B\xc3\xbcsche und B\xc3\xa4ume \xc3\xbcberschatten diesen Bach sehr stark.\xe2\x80\x9d This first sample, 1 male and 2 females, was tentatively identified as closely related to or identical with Rivulus peruanus (Regan, 1903), though they did not agree in several technical features with that species. In my key to the genus Rivulus 1 placed peruanus in the isthmensis-complex, though the frontal pattern of this species is not known. Moreover it has as many as 45\xe2\x80\x9447 rows of scales. The male of our sample had only 37 scales in lateral direction, whereas the females were both damaged and in bad state of preservation. I could not make out the proper number of scales.
Repository Name:
National Museum of Natural History, Netherlands
Type:
info:eu-repo/semantics/article
Format:
application/pdf
