. Bulletin of the British Museum (Natural History). Fig. 5 Recent distribution of Neritina. Insets: top, front view of N. lineolata (Lamarck), Para, Brazil; bottom, rear view of N. zebra (Bruguiere), Surinam; both about X Fig. 6 Neogene distribution of Neritina. â = N. ortoni Conrad; * = other species. The genus is uncommon during the Neogene in the Caribbean region but has been recorded from Jamaica and the Dominican Republic. Key: 1, Middle Magdalena deposits (Pilsbry & Olsson 1935); 2. Upper Magdalena Valley (Anderson 1928. Butler 1942, Porta 1966); 3. Chota Basin. 4. Cuen
. Bulletin of the British Museum (Natural History). Fig. 5 Recent distribution of Neritina. Insets: top, front view of N. lineolata (Lamarck), Para, Brazil; bottom, rear view of N. zebra (Bruguiere), Surinam; both about X Fig. 6 Neogene distribution of Neritina. â = N. ortoni Conrad; * = other species. The genus is uncommon during the Neogene in the Caribbean region but has been recorded from Jamaica and the Dominican Republic. Key: 1, Middle Magdalena deposits (Pilsbry & Olsson 1935); 2. Upper Magdalena Valley (Anderson 1928. Butler 1942, Porta 1966); 3. Chota Basin. 4. Cuenca Basin and 5, Loja and Malacatos Basins (all Bristow & Parodiz 1982); 6, Pebasian Basin (numerous authors and herein); 7, La Tagua (herein). fauna. These three geographically close localities appear to form a natural group within the Pebasian. It should be pointed out, however, that the sediments of Puerto Narino and Canama preserved in BMPD are very different. The Puerto Narino fauna may represent a rather less brackish facics than is usual in the Pebasian, but the positive evidence for this is not great. V. browni is the only member of the fresh-water Thiaridae present, but it is extremely common. Ostomya, Dyris, Liris and Toxosoma arc typical of the Pebasian and therefore are assumed to tolerate brackish conditions. The negative evidence consists of the comparath e rarity of Pachydon, the great rarity of Mxnlopsis and the absence of Neritina. In addition, naiad shell fragments arc extremely abundant and certainh much more common than in the single Hauxwell Collection concretion from Pichana. This suggests that some fresh-water habitat existed not far awa\.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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