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). We sampled two replicate sites of each habitat per island; boulder shore (âbouldersâ), upper tidal level of exposed rocky shore (âhigh rockyâ) and low-to-mean tide level of exposed rocky shores (âlow rockyâ). 2 Instituto de Estudos do Mar Almirante Paulo Moreira, Arraial ⦠Littorina saxatilis is continuously, or almost continuously, distributed around the shores of each island. Identifying Characteristics Try to find just a couple more facts on color differences such as between young and old. A dirty gray, eroded shell camouflages this periwinkle on rock faces in the high intertidal and splash zones. People that work at local fisheries are without jobs because of the dangerous fish disease that Littorina littorea is spreading to the native fish. PERIWINKLE (GASTROPODA: LITTORINIDAE) HABITAT SELECTION AND ITS IMPACT UPON MICROALGAL POPULATIONS . 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 . The shell is comprised of 6 whorls, with the body whorl about half of the total height of the snail. Littorina planaxis. Not on view at the Aquarium. Size: 1 inch long and 3/4 inch wide. Species Description. exposed rocks, boulders, barnacle zones), but each habitat has its own ecotype of snail (reviewed by Reid, 1996). Common Periwinkle (Littorina littorea)Alternate common names: Periwinkle, Winkle. Color: Shell is dark in color, usually brown, black, or gray. The status of the four currently recognised species in the Littorina saxatilis species-complex, i.e. Littorina littorea is used to control growth of Enteromorpha spp. on oyster and mussel beds in England, France and Holland (Clay 1961). No shells or preserved specimens survive as types from Linnaeusâ work, and Reid (1996) established a lectotype from one of Linnaeusâ drawings along with a diagnosis of the species. Seasonal appearance: All year. The marine snail Littorina mariae Sacchi & Rastelli occurs in high numbers in the littoral zone on fucoid macroâalgae. Species of Littorina that lack larvae occupy a wide variety of habitats (e.g. Only salt spray and splashes from high waves reach here, forming pools that dry in the sun. ( Fish and Fish 1989 ). 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). 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). Meet the eroded periwinkle. Description. Habitat and distribution: Tends to live lower on the shore than Littorina obtusata, otherwise habitat and distribution similar (Distr. This herbivorous snail lives in the eastern coast of North America from New Jersey to Newfoundland ( Trussell 1997 ). 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. Habitat: Intertidal zones, rocky shores, tide pools, pilings, and rock jetties. Enlarge image. Littorina obtusata, the smooth or flat periwinkle, received its name for the texture of its shell and the flattened shape of its spire. 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