Eutriphora auffenbergi Rolán & Lee, 2008

Fernandes, Maurício Romulo & Pimenta, Alexandre Dias, 2020, Unraveling one of the ‘ Big Five’: update of the taxonomy of Triphoridae (Gastropoda, Triphoroidea) from Brazil, European Journal of Taxonomy 665 (665), pp. 1-170 : 10-12

publication ID	https://doi.org/ 10.5852/ejt.2020.665
publication LSID	lsid:zoobank.org:pub:836C9171-0849-4F4D-BC8D-90C2D9E8B9D1
persistent identifier	https://treatment.plazi.org/id/03E58799-FFB5-AF7F-FDDD-FEEFFEB1FCB6
treatment provided by	Valdenar
scientific name	Eutriphora auffenbergi Rolán & Lee, 2008
status

Treatment

Eutriphora auffenbergi Rolán & Lee, 2008 View in CoL

Figs 2 View Fig , 22K View Fig , 33 View Fig

Eutriphora auffenbergi Rolán & Lee in Rolán & Fernández-Garcés 2008: 92 View in CoL , fig. 6.

Eutriphora auffenbergi View in CoL – Lee 2009: 88.

Material examined

Holotype

UNITED STATES OF AMERICA – Florida • West of Dry Tortugas, Monroe County; depth 90 m; FLMNH 419186 View Materials .

Paratypes

See Rolán & Fernández-Garcés (2008).

Other material

BRAZIL – Bahia • 1 spec.; 13º29′33″ S, 38º48′58″ W; depth 26 m; MNRJ 32611 View Materials GoogleMaps * • 1 spec.; 13º30′27″ S, 38º48′43″ W; depth 29 m; 25 Nov. 2010; MNRJ 32995 View Materials GoogleMaps * • 1 spec.; 13º30′35″ S, 38º47′05″ W; depth 42 m; MNRJ 32390 View Materials GoogleMaps * • 1 spec.; Minerva Bank ; 17º06′ S, 37º38′ W; depth 120 m; Aug. 2012; MZSP 110920 View Materials GoogleMaps .

MEXICO – 2 specs; Yucatan; depth 84–89 m; BMSM 107192 .

UNITED STATES OF AMERICA – Florida • 5 specs; near Carrabelle , Franklin County; Aug. 1963; J. Moore leg.; BMSM 67500 • 1 spec.; west of Anna Maria Island , Manatee County; depth 122 m; J. Moore leg.; BMSM 107195 • 1 spec.; off Fort Myers ; depth 18–36 m; BMSM 67496 • 1 spec.; off Marco Island , Collier County; depth 55–61 m; Sep. 1964; J. Moore leg.; BMSM 107198 .

Description

Shell sinistral, very elongated, conical, nearly rectilinear profile, up to 16.0 mm long (broken apex), 3.3 mm wide, length/width ratio 4.6 to 5.2. Protoconch multispiral, conical or columnar, 0.49 mm long, 0.40 mm wide, 4.25 convex whorls; embryonic shell dome-shaped, entirely covered by rounded granules; larval shell with two spiral cords, situated at ~35% and ~64% of last whorl height, adapical one disappearing just before transition to teleoconch; ~31 nearly rectilinear to slightly sigmoid axial ribs.Teleoconch with up to 16 whorls (broken apex); two spiral cords (adapical and abapical) at beginning, abapical one continuing to that of protoconch; median spiral cord emerges in third whorl, reaching same size of other cords after one to 1.5 whorl; on body whorl, distance between spiral cords 1.3–1.6 × higher than width of cords; 19 opisthocline axial ribs; rounded to slightly elliptical nodules of medium to moderately small size; distinct and well-developed suture, with small sutural cord; moderately nodulose to considerably wavy subperipheral and adapical basal cords, smooth median and abapical basal cords (only one shell had three cords); one supranumerical cord may be present, between median and abapical spiral cords; ovate to almost circular aperture, 0.93–2.00 mm long, 0.68–1.52 mm wide, length/width ratio 1.2–1.4; anterior canal curved downwards, being very long in large shells, often closed, crossed in its base by projection of outer lip, 0.52–1.54 mm long, 0.73–0.93 mm wide, length/width ratio 1.6–2.0; posterior canal as small sinus, not detached from aperture, 0.24–0.28 mm long. Cream, beige or brown shell, protoconch and base darker than remaining shell, first 1.5 whorl of teleoconch can be whitish.

Remarks

This is one of the largest triphorids from Brazil. Shells from Bahia State slightly differ from those of Florida ( USA): the holotype has a strong and exposed sutural cord, resulting in a thick subperipheral cord ( Fig. 2B View Fig ), but shells from Bahia present a less developed and partially hidden sutural cord ( Fig. 2I View Fig ), similar to one paratype from Florida ( Rolán & Fernández-Garcés 2008: fig. 6d). In addition, the median spiral cord of the teleoconch emerges in the fourth/fifth whorl in shells from Florida (Rolán & Fernández- Garcés 2008), but in the third whorl in the single complete shell from Bahia ( Fig. 2F View Fig ), herein regarded as a minor discrepancy.

In addition to differences noted by Fernandes & Pimenta (2015) to separate Eutriphora costai Fernandes & Pimenta, 2015 from E. auffenbergi , shells of E. auffenbergi from Bahia have almost one less protoconch whorl ( Fig. 2J View Fig ), an earlier emergence and development of the median spiral cord of the teleoconch, and a single supranumerical cord ( Fig. 2H View Fig ), not four as in E. costai . Moreover, the base is slightly darker in shells of E. auffenbergi . Although Bahia State represents the southern geographical limit of E. auffenbergi ( Fig. 34 View Fig ), it is the northern limit of E. costai ( Fig. 35 View Fig ).

Geographical records

USA: Florida ( Rolán & Fernández-Garcés 2008; Lee 2009); Mexico (this study); Brazil: Bahia (this study).

Bathymetric distribution

Depth: 5 m ( Rolán & Fernández-Garcés 2008) to 122 m (this study). Depths of 274 m and 183–578 m indicated in Rolán & Fernández-Garcés (2008) are suspicious, as they may be related to downslope transport.