Payraudeautia varovtsiana, Pedriali & Sosso & Dell’Angelo, 2019

Pedriali, Luca, Sosso, Maurizio & Dell’Angelo, Bruno, 2019, Naticid gastropods from the middle Miocene of western Ukraine, Zootaxa 4700 (2), pp. 151-195 : 183-185

Payraudeautia varovtsiana sp. nov.

( Fig. 31 )

Type material. Holotype and 4 paratypes ( Table 18 ).

Type locality. Varovtsi , Ukraine .

Type stage. Middle Miocene (Upper Badenian) .

Etymology. The name refers to the type locality, the village of Varovtsi, Ukraine.

Other material. Varovtsi: NP 10036 (3 shells); BD 174 (1 shell).

Diagnosis. Globose, robust shell with rather depressed spire and inflated last whorl. Umbilicus deep, large, with broad, rather depressed funicle and prominent, narrowly round-topped spiral ridge. Parietal callus wide, with small adapical knob and pointed anterior lobe; umbilical callus thick, semicircular, separated from anterior lobe of parietal callus by faint transverse groove. Colour pattern of uneven, dense whitish to brown collabral stripes and lines darker subsuturally and on lower base, over uniform pale brown background; apex, parietal and umbilical calluses whitish.

Description. Protoconch small, turbiniform, of 1.65 convex whorls, smoth except for small tip sculptured with unevenly noded, well spaced spiral threads. Teleoconch somewhat globose, moderately depressed, rather solid. Spire low-conical, rather depressed, whorls sligtly convex; suture thin, adpressed. Last whorl inflated, slightly expanded toward aperture; subsutural shelf indistinct, periphery above midline. Aperture D-shaped in slightly prosocline plane. Parietal callus large, with concave abapertural outline, thicker at both ends, with small, flat-topped adapical knob and pointed anterior lobe, ending near basal fasciole. Umbilicus deep, large; umbilical border rounded; um- bilical wall concave, incised by shallow groove, narrow to broad, bearing prominent, narrowly round-topped spiral ridge, inclined toward interior of umbilicus and terminating in subtriangular, asymmetric plug on lowermost part of inner lip. Funicle broad and rather depressed, separated from inner spiral ridge by broad and shallow groove. Umbilical callus thick, semicircular, separated from anterior lobe of parietal callus by slight to obsolescent transverse groove. Basal fasciole poorly defined. Surface with very fine growth lines, arched subsuturally. One well preserved specimen retains uniform pale brown background with pattern of uneven, dense whitish to brown collabral stripes and lines darker subsuturally and on lower base; apex, parietal and umbilical calluses whitish.

Remarks. Payraudeautia varovtsiana sp. nov. differs from the late Miocene to Recent Mediterranean species P. intricata (Fig. 29.6−8) in that it attains a smaller size and has: 1) a protoconch with a smaller initial half-whorl (0.191 and average 0.320 mm, respectively), 2) an adapical knob on the parietal callus 3) a greater aperture width (see Figs 14 and 15 ), 4) a narrower umbilicus, 4) a thinner spiral ridge separated from umbilical wall by a weaker groove, and 5) a different colour pattern of uneven, dense collabral stripes and lines (mottles, chevron and flammulate markings in P. intricata , see above remarks on P. sabrinae sp. nov.).

The unsculptured protoconch with about 1 more whorl, with greater diameter (average 1.037 and 0.706 mm, respectively) and smaller diameter of the first half-whorl (average 0.097 and 0.191 mm, respectively) is the primary element differentiating the late Miocene to late Pliocene Italian species P. fasciolata (Figs 29.4, 29.5) from P. varovtsiana sp. nov.

The Tortonian northwestern Italian species P. bituberculata (Figs 30.7, 30.8) is also similar to P. varovtsiana sp. nov., but differs from it in having an unsculptured protoconch of 1.3 more whorls, with greater diameter (average 1.082 and 0.706 mm, respectively), smaller diameter of the first half-whorl (average 0.058 and 0.191 mm, respectively, one-third of the size), and a narrower umbilical callus ( Fig. 20 ), which is subtriangular and not semicircular as in P. varovtsiana sp. nov.

Payraudeautia ermesi sp. nov. (see above) is distinguished from P. varovtsiana sp. nov. in having an unsculptured protoconch of 0.5 more whorls with a smaller diameter of the first half-whorl (average 0.103 and 0.191 mm, respectively), a higher spire (see Fig. 11 ) with more convex whorls, and a shorter anterior lobe.

Payraudeautia sabrinae sp. nov. (see above) can be easily distinguished from P. varovtsiana sp. nov. because of its unsculptured protoconch with larger diameter of the first half-whorl (average 0.306 and 0.191 mm, respectively), its higher spire (see Fig. 11 ), its markedly thicker parietal callus and anterior lobe, its smaller umbilical callus (see Fig. 20 ), its narrower umbilicus (see Fig. 17 ), with weaker inner spiral ridge, and its larger overall size.

Distribution. Middle Miocene: Central Paratethys (Upper Badenian) in Ukraine (this paper).

Figures

FIGURE 31. Payraudeautia varovtsiana sp. nov. from the middle Miocene (Upper Badenian) of Ukraine at Varovtsi. 1. Holotype, MPUM 11754, teleoconch and protoconch; 2. Paratype 1, MPUM 11755; 3. Paratype 2, MZB 50508, teleoconch and protoconch.Arrows point to the protoconch-teleoconch transition. Scale bars: 2 mm, except protoconchs: 500 µm (fig. 3c); 100 µm (fig. 3d).

FIGURES 12–19. FIGURE 12. Relationship between the spire height and the shell height for species of Polinices Monfort, 1810 studied herein. FIGURE 13. Relationship between the aperture width and the aperture height for species of Cochlis Röding, 1798 studied herein. FIGURE 14. Relationship between the aperture width and the aperture height for species of Payraudeautia Bucquoy, Dautzenberg & Dolfuss, 1883 studied herein. FIGURE 15. Relationship between the aperture width and the maximum diameter for species of Payraudeautia Bucquoy, Dautzenberg & Dolfuss, 1883 studied herein. FIGURE 16. Relationship between the umbilicus width and the maximum diameter for species of Euspira Agassiz in J. Sowerby, 1837 studied herein. FIGURE 17. Relationship between the umbilicus width and the maximum diameter for species of Payraudeautia Bucquoy, Dautzenberg & Dolfuss, 1883 studied herein. FIGURE 18. Relationship between the width of the umbilical callus and the maximum diameter for species of Cochlis Röding, 1798 studied herein. FIGURE 19. Relationship between the width of the umbilical callus and the maximum diameter for species of Tectonatica Sacco, 1890 studied herein.

FIGURES 20–22. FIGURE 20. Relationship between the width of the umbilical callus and the maximum diameter for species of Payraudeautia Bucquoy, Dautzenberg & Dolfuss, 1883 studied herein. FIGURE 21. Relationship between the width of the umbilical callus and the umbilicus width for species of Cochlis Röding, 1798 studied herein. FIGURE 22. Relationship between the width of the abapical sulcus and the width of the adapical sulcus for species of Cochlis Röding, 1798 studied herein.

FIGURES 4–11. FIGURE 4. Relationship between the diameter of the first half-whorl of the protoconch and the protoconch diameter in the naticine taxa studied. FIGURE 5. Relationship between the diameter of the first half-whorl of the protoconch and the protoconch diameter in the poliniceine and sinine taxa studied. FIGURE 6. Relationship between the diameter of the first half-whorl of the protoconch and the protoconch whorls in the naticine taxa studied. FIGURE 7. Relationship between the diameter of the first half-whorl of the protoconch and the protoconch whorls in the poliniceine and sinine taxa studied. FIG- URE 8. Relationship between the protoconch diameter/diameter of the first half-whorl ratio and the protoconch whorls in the naticine taxa studied. FIGURE 9. Relationship between the protoconch diameter/diameter of the first half-whorl ratio and the protoconch whorls in the poliniceine and sinine taxa studied. FIGURE 10. Relationship between the spire height and the shell height for species of Euspira Agassiz in J. Sowerby, 1837 studied herein. FIGURE 11. Relationship between the spire height and the shell height for species of Payraudeautia Bucquoy, Dautzenberg & Dolfuss, 1883 studied herein.

Tables

TABLE 18. Payraudeautia varovtsiana sp. nov., type material, repository numbers and basic parameters. Spm stands for number of specimens; H stands for shell height (indicated as the maximum value if the paratype includes more than one shell)

type material	repository	locality	spm	material	H (mm)	figures
Holotype	MPUM 11754	Varovtsi	1	shell	4.95	31.1a–c
Paratype 1	MPUM 11755	Varovtsi	1	shell	5.22	31.2a–c
Paratype 2	MZB 50508	Varovtsi	1	shell	4.52	31.3a–d
Paratype 3	IGS NANU B-III-15/2018	Varovtsi	1	shell	6.11
Paratype 4	ZISP 1/62206	Varovtsi	1	shell	4.23