Strobiligera, Dall, 1924

Fernandes, Maurício Romulo & Pimenta, Alexandre Dias, 2019, Taxonomic review of Inella and Strobiligera (Gastropoda: Triphoridae) from Brazil, Zootaxa 4613 (1), pp. 1-52 : 39-40

Strobiligera sp. 1

Figure 22

Material examined. Brazil: off Espírito Santo state: MNHN, MD55 41-DC73 [1].

Description. Shell sinistral, elongated, very thin, almost fusiform, rectilinear profile, reaching 3.19 mm in length, 0.77 mm in width, length/width ratio 4.1. Protoconch slightly globose, subcylindrical, 0.47 mm in length, 0.43 mm in width of its last whorl; 2.75 convex protoconch whorls, weak distinction between protoconch and teleoconch; initial whorl somewhat pointed, mostly smooth, but with several minute, irregular granules especially concentrated on its abapical portion; remaining whorls initially with a strong spiral cord in a median/adapical position of the whorl, assuming an abapical position and a keeled shape; an adapical cord appears soon after, much narrower than the abapical one until the end of protoconch, in addition to a small subsutural thread; the two main cords are situated at 26% and 60% of last whorl height. Teleoconch with up to ~8.5 whorls; three spiral cords in the beginning, continuous to those of protoconch, the adapical one narrower than other cords through the entire teleoconch; on the body whorl, distance between spiral cords is 2.1 times the width of cords; 15 opisthocline axial ribs; rounded nodules of a medium size; distinct suture, with a small sutural cord; narrow, slightly wavy subperipheral cord, one smooth, very narrow basal cord, close to the subperipheral cord; shortened base; no supranumerical cords; ovate aperture, length/width ratio 1.3; anterior canal partly broken; posterior canal not formed. White shell.

Remarks. Strobiligera sp. 1 is similar to shells of S. dinea from Brazil, the differences between them consisting of the width of the teleoconch (1.20 mm in a shell of of S. dinea 3.83 mm in length, 0.77 mm in a shell of Strobiligera sp. 1 3.19 mm in length), the dimensions of the protoconch (first whorl much inflated in S. dinea ) and the abapical cord of the protoconch being more prominent in Strobiligera sp. 1 (but the adapical one in S. dinea ).

The shell of Strobiligera sp. 1 is also apparently narrower than those of Strobiligera enopla ( Dall, 1927) ( Fig. 3X ) and Strobiligera meteora ( Dall, 1927) , both from the northwestern Atlantic ( Rolán & Fernández-Garcés 2008), in addition to the adapical spiral cord of the teleoconch of Strobiligera sp. 1 being broader than that of S. enopla but narrower than that of S. meteora .

Geographical distribution. Brazil: off Espírito Santo.

Bathymetric distribution. 607–620 m.

Figures

FIGURE 3. Type material of some species of Inella and Strobiligera. A–B. “Inella” intermedia (Dall, 1881), lectotype MCZ 7386 (A), non-type MCZ 7385 (B). C–D. “Inella” triserialis (Dall, 1881), paralectotypes MCZ 7384 (C) and MCZ 7382 (D). E–F. “Inella” faberi Rolán & Fernández-Garcés, 2008, holotype FLMNH 291343 (E), paratype FLMNH 419388 (F). G. “Inella” differens Rolán & Lee, 2008, holotype FLMNH 419184. H–I. “Inella” undebermuda Rolán & Lee, 2008, holotype FLMNH 419181 (H), paratype USNM 1112657 (I). J. “Inella” longissima (Dall, 1881), lectotype MCZ 7381. K–L. “Inella” harryleei Rolán & Fernández-Garcés, 2008, holotype FLMNH 419182 (K), paratype FLMNH 158178 (L). M. Strobiligera sentoma (Dall, 1927), lectotype USNM 108072. N. “Inella” pseudolongissima Rolán & Fernández-Garcés, 2008, paratype FLMNH 171183. O–P. Inella pseudotorticula Rolán & Lee, 2008, holotype FLMNH 419191 (O), paratype USNM 1112658 (P). Q. Strobiligera pompona (Dall, 1927), lectotype USNM 108339. R. Strobiligera compsa (Dall, 1927), lectotype USNM 333518. S–T. Strobiligera gaesona (Dall, 1927), lectotype and paralectotype USNM 108341. U–V. Strobiligera dinea (Dall, 1927), lectotype and paralectotype USNM 333517. W. Inella colon (Dall, 1881), paralectotype MCZ 7387. X. Strobiligera enopla (Dall, 1927), lectotype USNM 108074.Y. Inella apexbilirata Rolán & Fernández-Garcés, 2008, holotypeANSP 367841, credits of image to Paul Callomon. Scale bars: A, H–R, 5 mm; B–G, S–Y, 1 mm.

FIGURE 22. Strobiligera sp. 1. A–F. MNHN, 3.19 mm. Scale bars: A–B, 1 mm; C, 500 µm; D–E, 100 µm; F, 50 µm.