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 : 43

Strobiligera sp. 2

Figure 25

Material examined. Brazil: Rio Grande do Norte state: MNRJ 35113 , 04 º 44ʹ 53ʺ S, 36º 25ʹ 27ʺ W, 102–108 m, 23/v/2011 [5].

Description. Shell sinistral, elongated, conical, rectilinear profile, reaching 7.12 mm in length, 1.84 mm in width. Protoconch globose, inflated, 0.55–0.60 mm in length, 0.46–0.50 mm in width of its last whorl; 2.5 to 2.7 convex whorls, weak distinction between protoconch and teleoconch; first initial whorl dome-shaped, broad, mainly smooth but covered by minute, irregular-shaped granules; remaining whorls with two spiral cords, equal in strength, situated at 36–43% and 66–71% of last whorl height; intense micro-sculpture of axial wrinkles just below the suture. Teleoconch with up to 13.5 whorls; three spiral cords in the beginning, median and abapical ones continuous with those of protoconch; adapical cord narrower than other cords over the entire teleoconch; on the 13 th whorl, distance between spiral cords is 1.3 times the width of cords; 13 to 15 strongly opisthocline axial ribs; elliptical nodules, considerably pointed and partially cut in the middle, of a medium size; distinct suture, with a small sutural cord; base not formed. White shell, internodular spaces slightly darker than nodules of teleoconch.

Remarks. Strobiligera sp. 2 is distinguished from S. dinea by possessing a smaller, less inflated protoconch (Fig. 25E, G), minute granules on the first whorl of protoconch (Fig. 25F; not entirely smooth as in S. dinea : Fig. 21E ), a conical shell (Fig. 25A–D; not fusiform as in S. dinea : Fig. 21 A–B), and internodular spaces slightly darker than nodules of teleoconch.

Strobiligera sp. 2 has similar teleoconch coloration to that of Inella pseudotorticula ( Fig. 3 O–P), with internodular spaces darker than nodules, and a similar protoconch sculpture. Slight differences such as the more conical shell shape of Strobiligera sp. 2, its smaller adult shell size (although no complete adult shell was yet sampled) and the wide geographical isolation of both populations ( I. pseudotorticula is only known from Bermuda) suggest that they are different species. Complete adult shells are necessary for the description of this species.

Geographical distribution. Brazil: Rio Grande do Norte.

Bathymetric distribution. 102–108 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 21. Strobiligera dinea (Dall, 1927). A. MNHN, 9.03 mm. B. MNHN, 3.94 mm. C–G: same shell as A. Scale bars: A–B, 1 mm; C–D, 500 µm; E, G, 200 µm; F, 50 µm.