Strobiligera campista, Fernandes & Pimenta, 2019

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

Strobiligera campista sp. nov.

Figure 23

urn:lsid:zoobank.org:act:FBE0B96F-3327-4D19-BDA0-B4EDA1FA970A

Type material. Holotype: MNRJ 32350 , iii/2007 . Paratypes: Brazil: Rio de Janeiro state: MNRJ 18640 , HAB 16- G5 [1]; MNRJ 19481 , type locality, 11/iv/2003 [5]; MNRJ 32349 , type locality, ix/2004 [1]; MNRJ 18950 , type locality, iii/2007 [1]; MNRJ 31122 , type locality, xi/2007 [1]; IBUFRJ 11701 [1], IBUFRJ 19580 [5], 22º 48ʹ S, 40º 45ʹ W, 106–110 m , 27/i/1998; MNRJ 32546 , 23 º 0 5ʹ S, 40º 58ʹ W, 100 m [1].

Type locality. 22º 42ʹ S, 40º 40ʹ W, 110–120 m, Rio de Janeiro state, Brazil .

Etymology. This specific epithet refers to the citizens of Campos dos Goytacazes, in Rio de Janeiro state, because this species is apparently restricted to the Campos Basin (a sedimentary basin named for the above-mentioned city). Epithet as a noun in apposition.

Diagnosis. Light brown protoconch with 2.75 to 3 whorls, clearly distinct from the cream teleoconch; adapical spiral cord reaches nearly the same size as other spiral cords in the tenth/twelfth whorl of teleoconch; suture very shallow.

Description. Shell sinistral, elongated, conical, rectilinear profile, reaching 12.32 mm in length, 2.34 mm in width, length/width ratio 4.6 to 4.9. Protoconch globose, inflated, 0.51–0.65 mm in length, 0.45–0.53 mm in width of its last whorl; 2.75 to 3 convex protoconch whorls, clear distinction between protoconch and teleoconch; initial whorl dome-shaped, broad, smooth; remaining whorls with two spiral cords, with nearly the same strength, situated at 41% and 76% of last whorl height; micro-sculpture of subsutural axial wrinkles, more evident on the last whorl. Teleoconch with up to ~18 whorls; three spiral cords in the beginning, the median and abapical cords continuous with those of the protoconch; adapical cord narrower than other cords through most of teleoconch, but acquiring nearly the same size as other cords on the tenth/twelfth whorl; on the body whorl, distance between spiral cords is 1.2 times the width of cords; 14 to 16 nearly orthocline to opisthocline axial ribs; rounded (especially the adapical and median cords) to slightly elliptical (especially the abapical cord) nodules of a medium to moderately large size; distinct but shallow suture, with a small sutural cord; thick, smooth subperipheral cord, three smooth basal cords, the median one the narrowest of them; no supranumerical cords; ovate aperture, length/width ratio 1.2; anterior canal moderately short, directed downwards/backwards, and open, length/width ratio 0.9; posterior canal a small notch, not detached from the aperture. Light brown protoconch (first whorl sometimes translucent), cream teleoconch, spiral cords with nodules lighter than internodular spaces.

Remarks. Strobiligera campista sp. nov. mainly differs from S. dinea by shell color and by having a wider shell, but a smaller, less inflated protoconch (Fig. 23J). Strobiligera enopla ( Fig. 3X ) has a completely white shell and a much reduced adapical spiral cord on the teleoconch, in addition to a bathymetric range (538–823 m; Rolán & Fernández-Garcés 2008) deeper than that of Strobiligera campista sp. nov. (100–149 m).

Geographical distribution. Brazil: Rio de Janeiro.

Bathymetric distribution. 100–149 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.