
Slough Hydrobe Aphaostracon rhadinus Thompson 1968 Abundant along the northern third of the St Johns River system Florida Fig 95

This group contains six species in the Florida peninsula Figs 115a 115b 116a 116b 52b Penis with some superior tubercles fused into a U shaped crest parapical crest raised on a fleshy pedicel accessory crest and inferior crest usually

90 Fenney Spring Hydrobe Aphaostracon xynoelictus Thompson 1968 Endemic to Fenney Springs near Coleman Sumter County Florida Fig 101

3 whorls Fig 96 Length of shell 2 0 2 4 mm Fig 98 Suwannee Hydrobe Aphaostracon hypohyalina Thompson 1968 Figs 96 97

dead leaves and sticks Some specimens form a partial septum in the middle of the shell Fig 199 apparently in response to seasonal drying of their habitats Fig 205 90a Apex very obtuse almost in the middle of the shell Radial striations present or absent Laevapex Walker 1903 91 90b Apex subacute distinctly eccentric

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the Pacific Islands and Africa The species is highly variable in size and shape and six subspecies have been described Pilsbry 1934 Figs 189 190 191 192 193

Clifton Spring Hydrobe Aphaostracon theiocrenetus Thompson 1968 Endemic to Clifton Springs on the south shore of Lake Jessup Seminole County Florida Fig 93

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Melanoides tuberculata Müller 1774 Widely introduced throughout Florida Most commonly found in rivers streams c***s and springs Figs 41 42 43

Thompson 1968 Found in springs and spring fed streams in north central Florida from the Withlacoochee north and west to the Choctawhatchee River system Fig 113

species is named for Richard Franz in recognition for his many contributions to the biology of cave systems in Florida and adjacent regions of the Southeast Fig 134

of the lower Chattahoochee and Flint rivers in southeastern Alabama and southwestern Georgia Found in quiet water among aquatic plants Figs 109a 109b 50a Mantle richly marked with reddish brown blotches and spots Terminal lobe of penis slender Penis with a large blade like flagellum with continuous heavy dermal

59 58b Operculum paucispiral with about three rapidly expanding whorls Fig 124 60 Fig 123 124

Spilochlamys Thompson 1968 51 Figs 110 111 112

Considerable variation in obesity and sculpture rugosity exists between different populations and there is disagreement as to how many species occur in Florida Fig 40

to Monroe County Widely distributed in the West Indies and Central America Generally found in oligotrophic habitats on submerged vegetation Figs 177 178 179

16 17 9 Figs 15 16 17 8 Genus Lioplax Troschel 1856 8a

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the Florida Peninsula Named after O C Van Hyning founder of the Florida State Museum Florida Museum of Natural History and an ardent collector of mollusks Fig 56

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1963 It is essential that clean specimens be examined under proper lighting to observe diagnostic sculpture characteristics Figs 197 198 199 200 201 202 203 88a Shell usually elevated but variable Apex with fine radial striations Figs 204 207 often eroded in older specimens Peristome narrow to broadly ovate

Hydrobe Aphaostracon chalarogyrus Thompson 1968 Endemic to Magnesia Springs 3 7 miles west of Hawthorne Alachua County Florida Figs 102 102a

1825 Sparse throughout the northern half of the Florida peninsula and panhandle Primarily aquatic Most commonly found on algae covered rocks and logs Fig 141

Melanoides tuberculata is generally found in quieter eutrophic turbid habitats Melanoides turricula is found in cleaner oligotrophic springs and streams Fig 44 18 Family PLEUROCERIDAE 8a

to Florida In Florida it is found only in the Apalachicola River system Amphibious lives on damp ground and along seepage s among dead leaves sticks and rocks Fig 63 28b Central tooth of radula with basocones located on fore or lateral wing of tooth Figs 34 35 Aquatic moves by gliding motion Shell of various shapes and sculpture

Choctawhatchee River system A second species Notogillia sathon Thompson Satyr Siltsnail Fig 104 occurs in the Ocmulgee River system in Georgia Figs 103 104 Figs 105 106 107 108

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modeling Ultimately I wish to test the extent to which differences in these relationships account for the observed variation in the abundance or distribution of organisms Stegastes nigricans Links

ribbed Hydrobe Tryonia aequicostatus Pilsbry 1889 Generally distributed in the central part of the Florida peninsula in rivers springs and lakes Figs 77 78 79

Fig 84 Figs 85 86

Reeve 1860 is not identifiable with certainty The only available name that can be applied to this species is Goniobasis doolyensis Lea 1862 Figs 51 52 20b Spire of adults without distinct vertical ribs 21

Fig 158 Pewter Physa Haitia pomilia pomilia Conrad 1834 Widely distributed in the southeastern United States and found throughout Florida Fig 158 78 Family PLANORBIDAE 78a

99 Wekiwa Hydrobe Aphaostracon monas Pilsbry 1899 Endemic to Wekiwa Springs Orange County Florida Fig 99

and Escambia Counties Alabama It may occur in the Conecuh River in Santa Rosa County Florida but it has not yet been found in Florida Figs 53 54 55

and Escambia Counties Alabama It may occur in the Conecuh River in Santa Rosa County Florida but it has not yet been found in Florida Figs 53 54 55

between the typical subspecies anceps and the subspecies eucosmius Bartsch 1908 described from Lake Waccamaw North Carolina Figs 180 181 182 85b Whorls rounded not carinate above occasionally angular below Apex of shell flat topped but sunken below periphery of last whorl Base of shell regularly

Florida Most frequently found in small streams and ditches An amphibious species that usually occurs on damp soil among vegetation along the edge of the water Fig 142 Figs 143 144

Figs 143 144 Figs 145 146 73 Family PHYSIDAE 73a

Hershler 1991 occurs under flat rocks and wood It is found in the Ocmulgee River and in the lower Flint River system It may occur in Florida Fig 133 Fig 133 65b Shell shaggy with numerous spiral fimbriations that are broken into synchronized tufts Conical with relatively obese whorls Narrowly umbilicate Nuclear whorl