Conus erugatus (Hoerle, 1976)

Diagnosis ⁽¹⁾:

Adult shell of eight and one-half teleoconch whorls plus one and one-half wellrounded nuclear whorls. First three or four postnuclear whorls beaded on shoulders, remainder smooth. Spire low except for the much elevated early whorls. Sutures impressed but not channeled.

Spire whorls without spiral lineation, or with a single, faint thread midway between suture and shoulder. Slightly arcuate growth lines, not distinct.

Shoulder subacute; last whorl nearly flatsided; anal fasciole flat; anal notch shallow; outer lip nearly straight. Eight to ten coarse spiral cords encircling anterior fifth of shell, cords becoming crowded abapically. Columella straight; anterior canal obliquely truncate.

Dimensions of holotype: height 21.4 mm, diameter 12.0 mm.

Holotype: USNM 220114.

Type locality: TU 825, Farley Creek at abandoned mill about ~ mile west of bridge of Florida Highway 275 (SW ~Sec. 21, T1N, R9W), Calhoun

County, Florida.

Occurrence: Chipola Formation, Florida; late lower Miocene.

Figured specimens: Fig. 6, USNM 220114 (holotype). Fig. 7, USNM 220115; height 23.0 mm, diameter 13.2 mm; locality TU 999.

Other occurrences: TU locality nos. 457, 458, 459, 547, 554, 818, 819 , 820b, 821, 823, 824, 826, 827, 828, 949, 950, 1020, 1049.

Discussion:

C. erugatus has a similar outline to C. tapetus and both have beaded early whorls. The significant characteristics that differentiate the two species are the impressed sutures and shallow anal notch of C. erugatus as opposed to the adpressed sutures and deep anal notch of C. tapetus.

The majority of the 274 specimens of C. erugatus in the writer's collection were taken from the banks of Farley Creek, the remainder were collected from river localities. This is in exact reversal to the distribution of C. tapetus. Neither species has been found to occur on Ten Mile Creek.

Both C. erugatus and C. tapetus have a basic color pattern of broken spiral lines, but the predominant pattern is consistently different in the two species (see pl. 3, figs. 7b, and 4b ).