Davanella ankaraensis Okuyucu & Akbaş, 2026, gen. et sp. nov.

Abstract

Davanella ankaraensis gen. et sp. nov. urn:lsid:zoobank.org:act: 32686C24-35E1-49BD-9162-7204E5E84947 Fig. 8A–G Diagnosis Very large globular to ovoid Davanella gen. nov. with rounded periphery. Etymology Latin, from Ankara, the capital of Türkiye. Material examined Eight specimens were observed. 1 holotype and 5 paratypes are illustrated. Holotype (Fig. 8E) TÜRKİYE – Ankara • SE of Kutludüğün village, Kutludüğün Yayla, sample KDY–1; 39°52′11.0″ N, 33°05′51.4″ E; 20 Jun. 2023; Okuyucu and Akbaş leg.; KTÜN.CO– KDY1, KDY1.1–16. Paratypes (Fig. 8A–D, G) TÜRKİYE – Ankara • 5 specs; same data as for holotype; KTÜN.CO–KDY1, KDY1.2–2, KDY1.3–53, KDY1.8–4, KDY1.8–19, KDY1.8–25. Description Test large to very large, involute, globular to ovoid with rounded periphery. A central depression or umbilicus well-developed in axial section. Spherical proloculus, measuring 0.07–0.09 mm in outside diameter, followed by second tubular chamber. Initial part consists of approximately 12–15 loosely coiled glomospiroid whorls. In all subsequent whorls the height of the chamber increases rapidly. Adult specimens measure: D = 2.13–3.43 mm, w = 1.90–2.38 mm, the ratio w/D = 0.67–0.89, n.w. = 15–19. Wall thick, calcareous porcelaneous with perforations (comb teeth-shaped). A weak flosculinisation developed in adult stage. Aperture simple, terminal. Comparison Davanella ankaraensis gen. et sp. nov. differs from the species of the Rectogordiopsis gen. nov. by the presence of umbilicus. Microfossil association The associated foraminiferal fauna is listed in Table 1 and illustrated in Figs 4–6. Range and distribution Middle Permian (late Capitanian) of the Elmadağ Olistostrome, Ankara City, Central Türkiye.