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70% ethanol, and were extracted from the shells by decalcif^ation in Railliet-Henry fluid, or the shells were broken. Dissections were madę by standard techniques under a stereomicroscope with the specimen immerse in water. Some structures of the largest specimens, such as the buccal mass and genital ducts, and entire smali specimens were dehydratcd in ethanol senes, stained in carmine, cleared and fixed in creosote; or embedded in paraffin, sectioned at 7 pm and stained with Mallory triple strain. Protoconchs, opercula, radulae and jaws were also examined under SEM at the “Laboratório de Microscopia Eletrónica do Instituto de Biociencias da Universidade de Sao Paulo’'. Ali drawings were madę with the aid of a camera lucida. Anatomical terminology in generał follows Houbrick (1988).

Some species studied herein were also studied previously by other authors; in these ca-ses, the description is rcstrictcd to additional or interesting aspects. Respective references are evoked for complement the descriptions.

Ali measurements are in mm. The length of shells was obtained directly from the shell cven in species with the apex lost. The width of shells was obtained with the shell in ffontal view. In the morę abundant lots only three to six specimens were measured. Ali measured specimens are separatcd in the collection within the respective lot, for this reason in some species there is no precise indication provided as to which specimens were measured.

The finał stage of the cladistic analysis was performed by the Computer package Hennig86 (Farris, 1988) and TreeGardner 2.1 (Ramos, 1997). The character polarization was determined by outgroup method.

Morphological analysis is based mainly on data searched directly on the examined specimens, but previous anatomical or biological studies are also used, complementing and basing each family character. The papers are the foliowing: 1) Pleuroceridae: Magruder, 1935; Binder, 1959; Dazo, 1965; Davis, 1969, 1971; Brandt, 1974; Chambers, 1980; Dillon Sc Davis, 1980; Dillon, 1991; 2) Modulidae: Risbec, 1927; Abbott, 1944; Houbrick, 1980a; 3) Campanilidae: Houbrick, 198la, 1989; 4) Potamididae: Johansson, 1956; Houbrick, 199la; 5) Turritellidae: Randles, 1900; Graham, 1939; Johansson, 1946; Flores Sc

Macsotay, 1977; Bieler Sc Hadfield, 1990; 6) Thiaridae: Raymond, 1852; Graham, 1939; Abbott, 1948, 1952; Binder, 1959; Beny Sc Kadri, 1974; Brandt, 1974; Chaniotis et.al., 1980; 7) Cerithideidae: Bequaert, 1942;Bright, 1958,1960; Driscoll, 1972; Houbrick, 1986a; 8) Cerithiidae: Marcus Sc Marcus, 1963; Houbrick, 1973, 1977, 1980, 1980a, 1981a, 1985, 1986a, 1992; 9) Batillariidae: Bequaert, 1942; Driscoll, 1972; Houbrick, 1978; 10) Diastomatidae: Houbrick, 198Ib; 11) Vermetidae: Morton, 195la, b, c; 12) Litiopidae: Houbrick, 1987b; 13) Planaxidae: Barkati Sc Ahmed, 1982; Houbrick, 1987a, inclu-sive with cladistic analysis in genus level, 1990, 1991 b.

In figures, the following abbreviations are used: aa, anterior aorta; ac, anterior gastric chamber; af, gili afferent vessel; ag, albumen gland; ak, anterior kidney lobe; an, anus; ap, aperture of pallial gonoduct; au, auricle; ba, brood pouch aperture; bb, bursa aperture; bc, bursa co!upatrix; bg, buccal ganglion; bm, buccal mass; *>P, brood pouch; br, subradular membranę; ca, capsules; ce, cerebral ganglion; cg, capsule gland; cm, columellar muscle; cp, central pad; cr, crescentic ridge; cv, ctenidial vein; dd, duet to digestive gland; df, inner folds ofdorsal wali of buccal mass; dg, digestive gland; di, diverticle of m7; «ip. duet of pedał gland; dw, dorsal wali of buccal mass; ds, dark spot; ea, esophageal aperture; es, esophagus; ef, esophageal fold; eg, esophageal pouch; ep, epipodium; fn, flapcoveringnephrostome; ft, foot; fs, foot sole; ga, gastric arched dorsal fold; gd, pallial gonoduct; gf, gastric folds; gi, gili; go, gonad; gp, gonopericardial duet or ligament; gs, gastric shield; hg, hypobranchial gland; hm, ho-rizontal muscle; ic, inner chitinous layer of shell; ih, inner connection of radular sac with horizontai muscle; ii, inner lamina of pallial gonoduct; in, intestine; ir, insertion of m4 in tissue on radular ribbon; is, insertion of m5 in radular ribbon; it, in-testinal typhlosole; ji, insertion of jaw and pcribuccal muscles in odontophore; jm, jaw and peribuccal muscles; jw, jaws; ki, kidney; km, membranę between kidney and pallial cavity; ks, kidney septum; ml to mló, odontophore muscles; mb, mantle border; me, mesopodium; mo, mouth; mt, mantle; ne, nephrostome; nr, nerve ring; nv, nerve; oc, odontophoric cartilagc; od, odontophore; ol, outer lamina of pallial oviduct; om, ovarium;