Fenimorea petiti Tippett, 1995

Fallon, Phillip J., 2016, Taxonomic review of tropical western Atlantic shallow water Drilliidae (Mollusca: Gastropoda: Conoidea) including descriptions of 100 new species, Zootaxa 4090 (1), pp. 1-363 : 194-199

Fenimorea petiti Tippett, 1995

( Plates 92–94 )

Fenimorea petiti Tippett, 1995: 133 ; figs. 17, 33: Williams (2005: species 1570).

Drillia albicoma auct. non (Dall, 1889) is a possible misidentification by Sunderland & Sunderland (1993:14) according to Tippett (1995: 133).

Splendrillia petiti (Tippett, 1995) : Turgeon et al. (1998: 102).

Clathrodrillia albicoma auct. non (Dall, 1889) is a possible misidentification by Daccarett & Bossio (2011: 129, fig. 784).

Types. Holotype 13.2 x 5.1 mm (USNM 880073); paratypes, all from the type locality: 1 spec., 16.2 x 5.7 mm (ANSP 399202); 1 spec., 14.7 x 5.1 mm (DMNH 202363); and 2 other lots not examined in AMNH 226537 & MCZ 316101.

Type locality. Gulf of Mexico, W of Crystal River, Florida in 30 fms (59 m).

Other material examined. An additional 154 specimens were examined: Mexico: 2 spec., 12.3 x 4.7 & 13.3 x 4.9 mm, in 93–94 m, Campeche Bank, 20°51.16'N, 92°26.28'W, E. García! aboard R/V Pelican, 10 Jun 2005 (EFG 26123). Louisiana: 2 spec., 11.3 x 4.4 & 10.5 x 4.2 mm, in 86–91 m, Bryant Bank, 28°00.86'N, 92°27.56'W, E. García! aboard R/V Pelican, 23 Jun 2005 (EFG 26525); 3 spec., 7.6 x 3.2, 8.1 x 3.2 & 9.9 x 3.7 mm, in 60–70 m, Sackett Bank, 28°38.16'N, 89°33.19'W, E. García! aboard R/V Pelican, 7 Jun 2004 (EFG 25152); 1 spec., 15.2 x 5.6 mm, in 65–91 m, offshore, 27°59.141'N, 91°38.832'W, E. García! aboard R/V Pelican, 30 Jun 2001 (EFG 23180); 3 spec., 10.7 x 4.2, 11.3 x 4.3 & 8.8 x 3.5 mm, in 88 m, offshore, 28°4.57'N, 90°59.99'W, E. García! aboard R/V Pelican, 4 Jul 2003 (EFG 24659); 1 spec., 7.4 x 3.1 mm, in 62–95 m, offshore, 28°37.86'N, 089°33.25'W, E. García! aboard R/V Pelican, 24 Nov 1996 (EFG 17004); 6 spec., 6.9 x 2.9, 7.9 x 3.2, 8.3 x 3.4, 7.3 x 3.0, 6.9 x 3.0 & 5.6 x 2.6 mm, in 69 m, off Mississippi River Delta, ex coll. H.G. Lee, 89.55317°W, 28.636°N (UF 496643). Alabama: 1 spec., 13.6 x 5.0 mm, in 70–78 m, offshore, 29°33.59'N, 087°59.6'W, E. García! aboard R/V Pelican, 29 Jun 2006 (EFG 27722); 8 spec., 12.6 x 4.8, 13.7 x 4.8, 13.6 x 5.0, 13.1 x 4.8, 12.5 x 4.5, 11.6 x 4.7, 8.8 x 3.5 & 8.9 x 3.8 mm, in 87–88 m, offshore, 29°15.848'N, 088°20.146'W to 29°15.552'N, 088°20.319'W, E. García! aboard R/V Pelican, 27 Aug 2011 (EFG 30430); 1 spec. 12.5 x 5.0 mm, in 74–81, offshore, 29°26.20'N, 87°35.27'W, Alabama, E. García! aboard R/V Pelican, 30 Jun 2006 (EFG 27696). W Florida: 2 spec., 10.3 x 4.2 & 14.4 x 5.4 mm, in 46 m, 150° off Pensacola, Escambia Co., R/V Escape! 22 Jun 1954 (UF 156569); 2 spec., 13.9 x 5.3 & 15.0 x 5.0 mm, in 60–68 m, about 60 km SW of Cape San Blas, 29°17.75'N, 085°47.18'W, Gulf Co., E. García! aboard R/V Pelican, 3 Jul 2006 (EFG 27715); 1 spec., in 91 m, W of Tampa, Hillsborough Co., M.E. Powlus, 1967 (UF 260818); 1 spec., 16.2 x 5.7 mm, in 244 m, W of Tampa, Hillsborough Co., J. Moore! 1962 (DMNH 38470); 3 spec., 11.6 x 4.7, 13.8 x 5.3 & 15.6 x 5.6 mm, in 73 m, W of Egmont Key, Hillsborough Co., J. Moore! aboard Cavalier, Dec 1961 (UF 470318); 2 spec., 12.4 x 4.9 & 11.5 x 4.4 mm, in 37–55 m, W of Egmont Key, Hillsborough Co., J. Moore! Oct 1963 (EFG 11603); 5 spec., 2 smallest: 8.2 x 3.8 & 9.5 x 4.2 mm, in 73 m, 145 km W of Egmont Key, Hillsborough Co., J. Moore! (ANSP 314384); 2 spec., 15.7 x 6.2 & 12.9 x 5.2 mm, in 73 m, 153 km W of Egmont Key, Hillsborough Co., 27°34'N, 084°15'W, R. Dillon! 1972 (ANSP 395091); 2 spec., 8.1 & 1.2 mm, in 121–128 m, SW of Egmont Key, Hillsborough Co., D. Steger! 1966 (ANSP 306413); 4 spec., 17.1 x 5.8, 16.7 x 5.6, 14.8 x 5.2 & 14.4 x 5.5 mm, in 238 m, SW of Egmont Key, Hillsborough Co., J. Moore! (AMNH 100611); 2 spec., best 1: 15.1 x 5.2 mm, SW of Egmont Key, Hillsborough Co., J. Moore! Jul 1964 (AMNH 312076); 13 spec., the best 4: 17.6 x 6.2, 13.7 x 5.1, 16.7 x 5.9 & 10.9 x 4.2 mm, Gulf of Mexico, J. Moore! (USNM 900239); 1 spec., in 53 m, offshore (26°30'N, 82°20'W), Lee Co. (UF 259110); 1 spec., 13.2 x 5.1 mm, in 52 m, 129 km W of Boca Grande, Lee Co., 26°42'43''N, 082°15'28''W (ANSP 395529); 1 spec., in 77–86 m, offshore, 26°40'N, 82°30'W, Lee Co. (UF 259261); 1 spec., 12.7 x 5.3 mm, in 73–78 m, 160 km W of Sanibel I., 26°25.77'N, 83°43.03'W. Lee Co., E. García! aboard R/V Pelican, 4 Jun 2004 (EFG 25397); 1 spec., 13.5 x 5.1 mm, in 52 m, off Ft. Meyers, Lee Co., J. Moore! (EFG 12699); 1 spec., 18.6 x 6.5 mm, in 128 m, off W Florida, E. García! aboard R/V Pelican, 29 Jun 1993 (EFG 12993A); 1 spec., 12.4 x 4.7 mm, in 55 m, W of Cape Romano, Collier Co., J. Moore! 1966 (UF 255910); 3 spec., 11.1 x 4.6, 12.5 x 4.6 & 12.0 x 4.5 mm, in 30–61 m, W of Cape Romano, Collier Co., J. Moore! aboard Cavalier, Aug 1964 (UF 470321); 3 spec., 14.9 x 5.3, 13.5 x 5.0 & 10.8 x 4.5 mm, in 49 m, W of Cape Romano, Collier Co., J. Moore! Aug 1967 (USNM 900242); 1 sp. 16.4 x 5.9 mm, in 110 m, W of Anna Maria I., Manatee Co., J. Moore! 1961 (UF 158185); 3 spec., 12.2 x 4.6, 11.4 x 4.5 & 8.5 x 3.7 mm, in 91–122 m, 282 km W of Anna Maria Key, Manatee Co., J. Moore! Dec 1961 (USNM 667182). Florida Keys: 7 spec., 8.0 x 3.8, 6.1 x 3.0, 6.6 x 3.2, 6.3 x 2.8, 5.7 x 2.6, 5.3 x 2.5 & 5.2 x 2.5 mm, in 110 m, Eolis Station 5, SSE of channel buoy, Key West, 1919 (USNM 411079); 1 spec., 8.0 x 4.8 mm (juv.), in 183 m, off Key Largo, L.A. Burry! (UF 358446); 2 spec., 7.9 x 3.5 & 8.8 x 3.8 mm, in 183 m, off Alligator Reef Light, J. Moore! 1965 (ANSP 312527); 2 spec., 14.4 x 5.6 & 11.6 x 4.7 mm, in 85 m, 113 km NNW of Dry Tortugas, 1968 (UF 266467); 15 spec., 6.0 x 3.0, 7.7 x 3.6, 8.6 x 3.8, 8.5 x 3.9, 8.7 x 4.1, 9.7 x 4.4, 9.9 x 4.1, 11.3 x 4.7, 11.7 x 4.7, 12.0 x 4.7, 13.5 x 5.2, 13.1 x 5.0, 14.0 x 5.1, 13.9 x 5.1 & 14.1 x 5.4 mm, in 85 m, WNW of Dry Tortugas, Jun 1968 (UF 470319); 2 spec., in 27–37 m, Gulf of Mexico, 25°45'N, 81°50'W, M.E. Powlus, 1962 (UF 261495). E Florida: 1 spec., 16.3 x 5.6 mm, in 76 m, off Fort Pierce, Lucie Co., 27°48.9'N, 79°57.3'W, R.S. Houbrick! 8 May 1978 (USNM 786878); 1 spec., off Palm Beach, Palm Beach Co. (USNM 900243); 1 spec., 10.5 x 4.3 mm, in 96 m, W of Palm Beach, 26°44'N, 80°—'W, M. Glickstein! 16 Dec 1978 (EFG 11859); 5 spec., 9.8 x 4.1, 13.2 x 5.0, 14.2 x 5.2, 14.2 x 5.6 & 15.4 x 5.7 mm, in 91 m, off Palm Beach, Palm Beach Co., M. Glickstein! 1978 (UF 470320); 1 spec. in 110–137 m, N of Palm Beach Inlet, Palm Beach Co., McGinty! 24 Feb 1950 (UF 250924); 4 spec., 16.5 x 6.2, 16.4 x 6.4, 13.8 x 5.1 & 12.4 x 5.2 mm, in 110 m, off Palm Beach, Palm Beach Co., McGinty! 16 May 1950 (UF 223177); 1 spec., in 73–91 m, from Breakers Hotel to Biltmore Hotel, Palm Beach, Palm Beach Co., McGinty! 13 Dec 1950 (UF 250434); 3 spec., 15.0 x 6.0, 15.9 x 5.7 & 14.4 x 5.2 mm, in 91–110 m, off Biltmore Hotel, Palm Beach, Palm Beach Co., McGinty! 15 Feb 1950 (UF 250721); 1 spec., 15.1 x 5.7 mm, in 73–91 m, off Lantana, Palm Beach Co., McGinty! 11 Jan, 1951 (UF 221946); 2 spec., 16.9 x 6.0 & 11.8 x 4.5 mm, in 67 m, off Lantana, Palm Beach Co., G. Scarboro! 9 Feb 1981 (ANSP 360551); 9 spec., best 5: 15.0 x 5.5, 13.6 x 5.2, 12.5 x 4.7, 10.9 x 4.6 & 6.2 x 2.8 mm, in 82 m, off E Boynton Inlet, Palm Beach Co., M. Glickstein! (UF 121884); 3 spec., 18.0 x 6.7, 13.4 x 5.0 & 10.1 x 4.5 mm, in 73 m, off Ambassador Hotel, Palm Beach, Palm Beach Co., McGinty! Mar 1951 (UF 220021); 4 spec., 14.7 x 5.3, 13.7 x 5.4, 14.3 x 5.4 & 13.8 x 5.2 mm, in 73 m, between Breakers & Biltmore Hotels, Palm Beach, Palm Beach Co, McGinty! 13 Nov, 1950 (UF 2203003); 1 spec., 10.1 x 4.3 mm, in 55–73 m, Dodge Estate to inlet, Palm Beach, Palm Beach Co., McGinty! 14 Dec 1950 (UF 219674); 2 spec., 14.9 x 5.4 & 14.8 x 5.2 mm, in 73 m, N of Breakers Hotel, Palm Beach, Palm Beach Co., McGinty! 28 Jul 1950 (UF 223018); 2 spec., 23.6 x 8.2 & 16.5 x 5.9 mm, in 110 m, off Lake Worth, Palm Beach Co., McGinty! 3 Sep 1941 (UF 156440); 2 spec., 15.4 x 5.5 & 9.6 x 4.4 mm, in 91 m off Carysfort Reef, Miami-Dade Co., 25°13'N, 080°13'W, D. Cosman! Aug 1973 (ANSP 355794); 1 spec., 13.4 x 5.1 mm, in 91 m, off Carysfort Reef, Miami-Dade Co., D. Cosman! Aug 1973 (UF 470322).

Range and habitat. Mexico (Campeche Bank); Off Louisiana; off Alabama; W Florida (Levy Co.; Citrus Co.; Hillsborough Co.; Manatee Co.; Lee Co.; Collier Co.), Florida Keys; and E Florida (Lucie Co.; Palm Beach Co.; Miami-Dade Co.). The specimen illustrated in Daccarett & Bossio (2011: 129, fig. 784), if confirmed as this species, would extend its range to include San Andreas Is., Colombia. Reported from moderately deep water, mostly between 46– 183 m.

Description. Shell small (to 23.6 mm total length), fusiform; whorls convex, total about 9¾, the last approximately 58% of overall shell length. Shell surface smooth with a matte to glossy appearance; ribs are the dominant sculptural element; aperture narrow with a short but distinct anterior canal. Protoconch of 1¾–2 smooth round whorls. Axial sculpture of straight convex ribs, from suture-to-suture, peripheries vary among individuals from mid-whorl to below mid-whorl, evanesce on shell base; interspaces about as wide as ribs, which number 7–14 on penultimate and 6–10 on last whorl to varix. Growth striae present, run oblique to ribs, are recurved on shoulder. Varix large, distinct, not broadly hump-like but more like an enlarged rib—a little wider and higher; positioned about ¼- to ⅓-turn from edge of outer lip, Spiral sculpture of very fine threads made jagged by intersecting growth striae somewhat finer than spiral threads; threads finer and closer still on whorl shoulders. Shallow pits form in spaces between striae, axially bounded by spiral threads. Sulcus absent or nearly so; slightly narrower, reduced, and recurved axials may be present to mark the previous position of the anal sinus. Outer Lip thin, strengthened with one or more axial folds; lip edge flexed inward near anal sinus, and outward at the edge of the sinus. Edge of lip traces a low ark from anal sinus to anterior canal; stromboid notch wide, shallow. Anal sinus deeply notched, apex round, edges flared upward, parietal lobe on one side, and outward flexed outer lip causes the sinus to appear spout-like in fully developed individuals. Inner lip thin, emarginate, pinched erect anteriorly, formed into a lobe posteriorly. Lobe is positioned over the roof of the aperture. Anterior canal short but distinct, open, unnotched. Anterior fasciole not swollen, its surface microsculpture the same as on shell base. Color off white with a broad light golden yellow to light orange to reddish brown band, rarely interrupted by the ribs.

Remarks. Taxonomy. According to Tippett (1995: 133) Fenimorea petiti is up to 17.7 mm in length (23.6 mm in this work), has ribs suture-to-suture, butterfly wing-scale microsculpture, and a varix ¼-turn from the edge of the outer lip (holotype and some paratypes are depicted in Plate 92 ). It also has a narrow rib-like varix, a well-defined anterior canal, and lacks a distinct sulcus, characteristics that align F. petiti with the deeper water species of Fenimorea , rather than with shallow water species that have shorter anterior canals, hump-like varices, and a wide, distinct sulcus. Variability. The average length of 134 specimens is 12.11 mm (5.2–23.6 mm), the average W/ L ratio of 132 specimens is 0.397. The width of the central color band varies, as does its intensity and shade. Specimens from E Florida (see Plate 93 ) differ from the typical W Florida form, exemplified by the holotype, in possessing less convex whorls. These differences are not believed sufficient to separate them at the level of species. Specimens from the NW Gulf of Mexico differ in size, shape, and color from the type (see Plate 94 ). Specimens from off Alabama are much darker colored (Pl. 94, Figs. 12 –19), and from off the Mississippi River Delta, even though apparently fully developed, are diminutive (Pl. 94, Figs. 32–33). Identification. Fenimorea petiti is similar to F. pagodula (Dall, 1889) but that species differs in possessing ribs that are less convex, in having a higher spire, and in having a more subdued, narrower mid-whorl color band.

Figures

PLATE 92. Fenimorea petiti (Tippett, 1995), mostly W Florida specimens. Figs. 1 – 3: holotype, W of Crystal River, W Florida (USNM 880073). Fig. 1: ventral, lateral & dorsal views; Fig. 2: enlarged view of protoconch (not to scale); Fig. 3: apical view, V = varix, L = edge of outer lip. Lower panel. Fig. 4: off Key Largo, Florida Keys (UF 358446); Fig. 5: off Cape Romano, Collier Co., W Florida (USNM 900242); Fig. 6: Gulf of Mexico, off W Florida (USNM 900239); Fig. 7: W of Anna Maria Key, Manatee Co., W Florida (USNM 667182); Figs. 8, 10: off Cape Romano, Collier Co., W Florida (USNM 900242); Figs. 9, 11 – 12: Gulf of Mexico, off W Florida (USNM 900239); Fig. 13: off Ft. Pierce, St. Lucie Co., E Florida (USNM 786878); Figs. 14 – 15: paratype, W of Crystal River, W Florida (ANSP 399202), ventral view and enlarged view of protoconch (not to scale); Fig. 16: paratype, W of Crystal River, W Florida (DMNH 202363).

PLATE 93. Fenimorea petiti (Tippett, 1995). E Florida specimens. Fig. 1: off Carysfort Reef, Miami-Dade Co. (ANSP 355794); Figs. 2 – 3, 5: off Biltmore Hotel, Palm Beach, Palm Beach Co. (UF 250721); Fig. 4, 7 – 8, 10: off Biltmore Hotel, Palm Beach, Palm Beach Co. (UF 250721); Fig. 6: off Lantana, Palm Beach Co. (ANSP 360551); Fig. 9: off Lantana, Palm Beach Co. (UF 221946); Fig. 11 – 12, 14 – 16: off E Boynton Inlet, Palm Beach Co (UF 121884); Fig. 13: off Fort Pierce, Lucie Co. (UF 786878); Fig. 17: off Ambassador Hotel, Palm Beach, Palm Beach Co. (UF 220021); Figs. 18 – 22, 26: between Breakers & Biltmore Hotels, Palm Beach (UF 223003); Fig. 23: Dodge Estate to inlet, Palm Beach, Palm Beach Co. (UF 219674); Figs. 24 – 25: N of Breakers Hotel, Palm Beach, Palm Beach Co. (UF 223018); Fig. 27: off Lake Worth, Palm Beach Co. (UF 156440).

PLATE 94. Fenimorea petiti Tippett, 1995. Florida Keys, Gulf of Mexico specimens. Figs. 1 – 7: SSE of Channel Buoy, Key West, Florida Keys (USNM 411079); Fig. 9: W of Sanibel I., Lee Co., W Florida (EFG 25397); Figs. 10 – 11: off Campeche, Campeche Bank, Mexico (EFG 26123); Figs. 12 – 19: off Alabama (EFG 30430); Figs. 20 – 21: Bryant Bank, Louisiana (EFG 26525); Figs. 22 – 24: Sackett Bank, Louisiana (EFG 25152); Fig. 25: W of Egmont Key, Hillsborough Co. W Florida (EFG 12993 A); Figs. 26 – 27: SW of Cape San Blas, Gulf Co., W Florida (EFG 27715); Fig. 28: off Louisiana (EFG 23180); Figs. 29 – 31: off Louisiana (EFG 24659); Figs. 32 – 33: off Mississippi River Delta, Louisiana (UF 496643).