Payraudeautia sabrinae, 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 : 180-183

Payraudeautia sabrinae sp. nov.

(Fig. 30.1−6)

Type material. Holotype and 17 paratypes ( Table 16).

Type locality. Varovtsi , Ukraine .

Type stage. Middle Miocene (Upper Badenian) .

Etymology. The species is named for Cinzia Brunelli, familiarly called Sabrina, wife of one of the authors (LP).

Other material. Varovtsi: NP 10035 (135 shells); BD 170 (619 shells); MS 108 (88 shells). Horodok: NP 10034 (4 shells); BD 171 (15 shells); MS 109 (9 shells). Velyka Levada: NP 10033 (3 shells); BD 172 (32 shells); MS 110 (8 shells). Zalistsi: NP 10042 (10 shells); BD 173 (7 shells); MS 111 (7 shells).

Diagnosis. Globose shell with moderately depressed spire and inflated last whorl. Umbilicus deep, narrow, with broad, depressed funicle and narrowly round-topped spiral ridge. Parietal callus wide, with adapical knob and tongue-shaped, massive anterior lobe; umbilical callus depressed and rather thick, semicircular, forming right angle with abapical side of anterior lobe. Colour pattern of uneven whitish-brown collabral stripes, darker subsuturally and on lower base, over uniform pale brown background; apex, parietal and umbilical calluses whitish.

Description. Protoconch small, turbiniform, of 1.5−1.6 convex and smooth whorls, tip medium-sized. Teleo- conch globose, moderately depressed, rather solid. Spire low-conical, moderately depressed, whorls gently 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 rather wide, with concave abapertural outline, thick to very thick, with adapical knob and tongue-shaped, massive anterior lobe, reaching basal fasciole and partially filling umbilicus. Umbilicus deep, narrow; umbilical border flatly rounded; umbilical wall concave, with attenuate groove and bearing faint to thin, narrowly round-topped spiral ridge, bent 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 narrow groove with gently sloping outward adaxial side. Umbilical callus depressed and rather thick, semicircular, forming right angle with abapical side of anterior lobe. Basal fasciole broad and robust, scarcely prominent. Surface with very fine growth lines arched subsuturally. Some well preserved specimens retain uniform pale brown background with pattern of uneven whitish-brown collabral stripes darker subsuturally and on lower base; apex, parietal and umbilical calluses whitish.

Remarks. The teleoconch shape and the values of the characteristic elements of the protoconch of Payraudeautia sabrinae sp. nov. are similar to those of the closely related late Miocene to Recent Mediterranean species P. intricata (Fig. 29.6−8). However, P. sabrinae sp. nov. differs from P. intricata in having: 1) an unsculptured protoconch; 2) a parietal callus with an adapical knob and a strong anterior lobe; 3) a greater aperture width (see Figs 14 and 15 ); 4) a narrower umbilicus (see Fig. 17 ); 5) a weak spiral ridge not separated from umbilical wall by a broad groove; and 6) a different colour pattern of uneven collabral stripes (whitish mottles and reddish-brown irregular chevron or flammulate markings arranged into 4−5 spiral rows in P. intricata ). The parietal callus is the most obvious distinguishing character.

The late Miocene to late Pliocene Payraudeautia fasciolata (Fig. 29.4, 29.5), is another similar Italian species, differing from P. sabrinae sp. nov. by having a protoconch with 1 more whorl, with greater diameter (average values 1.037 mm and 0.742 mm, respectively) and smaller diameter (average values 0.097 mm and 0.306 mm, respectively) of the first half-whorl (one-third of the size), a less elevated spire (see Fig. 11 ), a narrower aperture (see Figs 14 and 15 ), a parietal callus with somewhat smaller anterior lobe, a larger umbilicus (see Fig. 17 ) and a more excavated umbilical wall.

The Tortonian northwestern Italian species Payraudeautia bituberculata (Fig. 30.7, 30.8) is also similar to P. sabrinae sp. nov., but can be easily differentiated from it because of its protoconch with 1.4 more whorls, with greater diameter (average values 1.082 mm and 0.742 mm, respectively) and smaller diameter (average values 0.058 mm and 0.306 mm, respectively) of the first half-whorl (one-fifth of the size), its lower spire (see Fig. 11 ), its parietal callus ending with rounded knob instead of a strong and massive lobe, and its wider umbilicus (see Fig. 17 ).

Payraudeautia ermesi sp. nov. (see above) differs from P. sabrinae sp. nov. by having a protoconch of 0.5 more whorls, with smaller diameter of the first half-whorl (average 0.103 mm and 0.306 mm, respectively), a thinner parietal callus, a fainter anterior lobe, a wider umbilicus (see Fig. 17 ), a more incised umbilical wall bearing a more elevated and wider spiral ridge, separated from the funicle by a broader groove. It is also worth noting that P. ermesi sp. nov. attains a smaller size.

P. sabrinae sp. nov. and Payraudeautia obelixi Landau, Ceulemans & Van Dingenen 2018 recovered from upper Miocene (Tortonian) of North West France have similar protoconch characters (protoconch measures reported by the authors: DHW 0.270 mm, PD 0.820 mm) and cannot be differentiated on this basis; however, P. sabrinae sp. nov. differs from P. obelixi in having a massive and stronger anterior lobe, a wider and thicker parietal callus, not interrupted in the mid portion as in P. obelixi , and a thinner spiral ridge separated from umbilical wall by a weaker groove.

Payraudeautia ermesi sp. nov. and Payraudeautia varovtsiana sp. nov. (see below), can be easily separated from P. obelixi by having a protoconch with smaller diameter of the initial half-whorl (average value 0.103 mm, values 0.191 mm and 0.270 mm, respectively), a broader and more prominent funicle and a weaker spiral ridge, separated from umbilical wall by a shallower groove. In addition, P. ermesi sp. nov. differs from P. obelixi because of its protoconch of 0.70 more whorls.

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

Figures

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 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.