Domiporta turpis Harzhauser & Landau 2021, nov. sp.
Creators: name: Harzhauser, Mathias
name: Landau, Bernard
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Neogastropoda
Mitridae
Domiporta
Domiporta turpis

description: Domiporta turpis nov. sp.
Figs 7K 1 –K 2, 8A 1 –A 2
Mitra scrobiculata Brocc. — Hörnes 1852b (pars): 100, pl. 10, fig. 17 [non Brocchi, 1814].
Type material. Holotype: NHMW 1846 /0037/0098a, SL: 24.5 mm, MD: 6.5 mm, Baden (Austria), illustrated in Hörnes (1852b, pl. 10, fig. 17), 7K 1 –K 2, 8A 1 –A 2.
Type locality. Baden (Austria), Vienna Basin.
Type stratum. Clay of the Baden Formation.
Age. Middle Miocene, middle Badenian (Langhian).
Etymology. From Latin turpis (= ugly).
Diagnosis. Domiporta species of medium size, slender fusiform profile, characterised by blunt, bifid ad- and abapical spiral cords on penultimate whorl and numerous, blunt, flattish, regularly spaced spiral cords on last whorl, delicate axial riblets in spiral grooves on spire and last whorl.
Description. Shell medium sized, slender fusiform with elongate last whorl. Protoconch unknown. Teleoconch of eight whorls. Spire whorls straight sided to weakly convex with deeply incised suture. First teleoconch whorls cancellate with two flattened spiral cords, increasing to three cords on fourth whorl. Ad- and abapical spiral cords bifid by intercalation of secondary spiral groove. Spiral grooves between primary cords deep, with rectangular cross section and delicate axial riblets, widening on penultimate and last whorls. Last whorl and base bearing about 18 blunt, broad, flattened spiral cords. Axial sculpture of delicate growth lines in deep interspaces. Last whorl slowly contracting with weak concavity at base. Aperture narrow, elongate. Columellar callus narrow, sharply delimited. Columella with two oblique, narrow, weak columellar folds; third abapical fold even weaker. Outer lip not preserved. Siphonal canal moderately long, narrow, slightly bent to left, weakly twisted, with deeply incised siphonal notch. Colour pattern in UV light (Figs 7K 1 –K 2) consisting of dark spiral stripes coinciding with spiral grooves.
Shell measurements and ratios. SL = 22.5 mm, MD: 6.5 mm; AA = 30°, SL/MD: 3.7, AL/AW: 7.0, AH/S: 2.1.
Discussion. This species is characterised by its flattened spiral cords and deep spiral grooves. It is reminiscent of Domiporta austrogallica (Mayer-Eymar, 1898) in shape and size, but differs in its more slender shape, coarser spiral sculpture, greater number of spiral cords on the last whorl, broader spiral cords, and the distinctly narrower siphonal canal. Domiporta sallomacensis sensu Peyrot, 1928, from the Serravallian of France, seems to represent a closely related species, but is less slender, has more convex spire whorls, narrower spiral grooves, and lacks prominent axial riblets in the spiral grooves. Domiporta turpis nov. sp. could be mistaken for a juvenile Cancilla exornata (Bellardi, 1887), but differs in its much smaller size and blunt spiral cords on early teleoconch whorls.
Palaeoenvironment. The clay of the Baden Formation formed in middle to outer neritic settings with up to 250 m water depth (Hohenegger et al. 2008).
Distribution in Central Paratethys. Badenian (middle Miocene): Vienna Basin: Baden (Austria) (Hörnes 1852b).
description: Published as part of Harzhauser, Mathias & Landau, Bernard, 2021, The Mitridae (Gastropoda: Neogastropoda) of the Miocene Paratethys Sea, pp. 1-72 in Zootaxa 4983 (3) on pages 31-33, DOI: 10.11646/zootaxa.4983.1.1, http://zenodo.org/record/4921887