A dirty gray, eroded shell camouflages this periwinkle on rock faces in the high intertidal and splash zones. Species Description. Size: 1 inch long and 3/4 inch wide. APOLINÁRIO, M., 1 COUTINHO, R. 2 and BAETA-NEVES, M. H. 2 1 Museu Nacional, Departamento de Invertebrados, Carcinologia, Universidade Federal do Rio de Janeiro, CEP 20940-040, Rio de Janeiro, RJ, Brazil . Habitat: Intertidal zones, rocky shores, tide pools, pilings, and rock jetties. Seasonal appearance: All year. ( Fish and Fish 1989 ). No shells or preserved specimens survive as types from Linnaeus’ work, and Reid (1996) established a lectotype from one of Linnaeus’ drawings along with a diagnosis of the species. Description. Enlarge image. This herbivorous snail lives in the eastern coast of North America from New Jersey to Newfoundland ( Trussell 1997 ). The marine snail Littorina mariae Sacchi & Rastelli occurs in high numbers in the littoral zone on fucoid macro‐algae. PERIWINKLE (GASTROPODA: LITTORINIDAE) HABITAT SELECTION AND ITS IMPACT UPON MICROALGAL POPULATIONS . Body essentially as in Littorina obtusata, but differs in the penis (long tapering tip), arrangement of penial glands (single row of 5 -16 glands) and lack of pigmentation in ovipositor (L. fabalis-penis). Meet the eroded periwinkle. We sampled two replicate sites of each habitat per island; boulder shore (‘boulders’), upper tidal level of exposed rocky shore (‘high rocky’) and low-to-mean tide level of exposed rocky shores (‘low rocky’). Identifying Characteristics Try to find just a couple more facts on color differences such as between young and old. Habitat and distribution: Tends to live lower on the shore than Littorina obtusata, otherwise habitat and distribution similar (Distr. Color: Shell is dark in color, usually brown, black, or gray. Common Periwinkle (Littorina littorea)Alternate common names: Periwinkle, Winkle. Littorina littorea is used to control growth of Enteromorpha spp. Littorina obtusata, the smooth or flat periwinkle, received its name for the texture of its shell and the flattened shape of its spire. exposed rocks, boulders, barnacle zones), but each habitat has its own ecotype of snail (reviewed by Reid, 1996). People that work at local fisheries are without jobs because of the dangerous fish disease that Littorina littorea is spreading to the native fish. HABITAT SELECTION AND MIGRATORY BEHAVIOUR OF THE INTERTIDAL GASTROPOD LITTORINA LITTOREA (L.) BY ROBERT P. GENDRON* Boston University Marine Program, Marine Biological Laboratory, Woods Hole, Mass., U.S.A. INTRODUCTION One of the most distinctive characteristics of rocky shores is the zonation of plants and animals (Stephenson & Stephenson 1972). The name Littorina littorea was in common use among scientists by the 1830s-1840s, but the species was originally described by Linnaeus (1758) as Turbo littoreus. Not on view at the Aquarium. The mangrove periwinkle, Littorina angulifera, is a common intertidal snail in mangrove forests of the southeast United States.The shell color of L. angulifera varies from bluish white, orange to dull yellow, reddish brown to grayish brown (Andrews 1994). Littorina planaxis. Species of Littorina that lack larvae occupy a wide variety of habitats (e.g. on oyster and mussel beds in England, France and Holland (Clay 1961). Littorina saxatilis is continuously, or almost continuously, distributed around the shores of each island. The shell is comprised of 6 whorls, with the body whorl about half of the total height of the snail. 2 Instituto de Estudos do Mar Almirante Paulo Moreira, Arraial … Only salt spray and splashes from high waves reach here, forming pools that dry in the sun. 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