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1963. Wekiwa Hydrobe 174-176). Shell elliptical in shape. Florida Cone (Family) Conidae Distinguishing Characteristics: The Cones are easily identified by the distinctive cone-like shape and a long aperture that reaches up to their shoulder. Sexes strongly dimorphic in size, males about half as long as females. (Thompson, 1969). Vertical ribs relatively strong and more widely spaced. Some species that are endemic to Florida springs live in environments with nearly constant temperatures and apparently reproduce continuously throughout the year. Umbilicus variable. Numerous species of exotic snails are serious pests of plants and threats to public health. Length of shell 3.0-4.0 mm (Fig. 5). Operculum loosely coiled, with 3.75 large whorls, the outer one expanding more rapidly than the others (Figs. Radula with bicuspid lateral teeth (Fig. Combining characteristics of cranes and rails, it . 55). Floridobia alexander Penis with a small blade-like flagellum along right margin and a heavy mid-ventral ridge that bears 8-11 narrow transverse dermal glands; other glands present on terminal lobe and flagellum (Figs. This causes problems in species identification and yield an undermeasure of the actual number of species that exist in nature. Hood Ancylid Newborn shells white. Nuclear whorl 0.41 mm in diameter transverse to initial suture. Pewter Physa Dense Hydrobe The snails identified in Pasco County look different from the ones previously seen in Miami-Dade County: Their flesh is creamy white, rather than grayish brown. Shell conical, olivaceous in color. 1905. (Lea, 1862). Floridobia vanhyningi 172). Basch (1963) recognized five valid species. USDA APHIS | Mollusks 169). 162-164). The other three forms, C. limum (Anthony, 1860), C. floridense Call,1866 and C. parthenum Vail, 1979, are exclusively apomictic parthenogens and have been separated on the basis of aperture coloration, embryonic shell coloration, and contour of the outer lip (Vail 1979a). Embryonic shell smooth, without spiral chords (Fig. Goldenhorn Marisa Length of shell 2.1-2.8 mm (Fig. Shell ovate in shape, about 1.2-1.5 times as high as wide. Floridobia petrifons Elimia floridensis ssp. Body whorl compressed (Fig. (Thompson, 1968). Adult shell without lamella on interior walls of aperture. Shell more slender and attenuate; spire more elongate in adults, about 0.7- 1.0 times height of aperture. Length of shell 2.4-3.4 mm (Fig. Spiketopped Applesnail Definitive identifications may require anatomical dissections and reference to other literature. Operculum with about 3 whorls (Fig. 45). 58). Length of shell 2.0-2.5 mm (Fig. Apical whorls depressed; body whorl obtusely angular above and sharply carinated around funnel-shaped umbilicus. Identification should conform with all data in the key and with geographic distributions. Aperture relatively large with fine, uneven, serrate denticles along parietal wall (Fig. 1934. Review of the Planorbidae of Florida with notes on other members of the family. Aphaostracon pycnus 35). Floridobia helicogyra Shell with prominent ribs and spiral chords on all whorls. Four species currently are recognized, but the genus has received very little study over most of its range. It can grow to a length of 16 inches (400 millimeters) and is easily identifiable by the left-handed opening of the shell - meaning when you look at the shell, the opening is on the left.