Zeilleria, MACFARLAN, 2023

MACFARLAN, DONALD ALEXANDER BANKIER, 2023, Otapirian (Rhaetian) Terebratulida (Brachiopoda) of Zealandia, Zootaxa 5374 (1), pp. 1-34 : 24

publication ID	https://doi.org/ 10.11646/zootaxa.5374.1.1
publication LSID	lsid:zoobank.org:pub:072341AB-7693-4DF3-9286-D69D0BBD8FAD
DOI	https://doi.org/10.5281/zenodo.10168052
persistent identifier	https://treatment.plazi.org/id/073F87AD-FFB8-5A6A-FF4B-FE07FB9FFA74
treatment provided by	Plazi
scientific name	Zeilleria
status	n. sp.

Treatment

Zeilleria View in CoL n. sp.

Fig. 17.1a–d. View FIGURE 17

A single specimen, B832 from NC/f0007A (AU 7149) is moderately large with a strongly inflated dorsal valve. It is distinct in shape and size from any other Zealandian Zeilleria .

Material. B832, a double-valved shelly specimen from NC/f0007A, AU 7149, Bouraké Formation, île Hugon, New Caledonia, late Otapirian.

Description. Terebratulide of moderately large size with a rounded-heptagonal outline. Both valves are wellinflated, with the dorsal valve more inflated posteriorly. The dorsal valve has a shallow fold anteriorly. The ventral valve lacks a definite fold. The anterior commissure has a broad, shallow uniplication which is about half of the valve width. The exterior of both valves is smooth posteriorly, with low stepped growth lines anteriorly.

In the ventral valve the beak is short, broad, triangular and slightly incurved. The foramen is small, and poorly shown. It is probably submesothyrid. The beak ridges are strong and sharply rounded.

Punctae were not seen, probably due to recrystallisation.

Details of hinge and loop were not seen. The median septum in the dorsal valve is poorly shown but probably about one-third of valve length.

Dimensions. Dimensions of the specimen are shown in Table 6.

TABLE 6. Dimensions, Zeilleria n. sp.

Remarks. The sole specimen has much greater inflation than Zeilleria spiculata , especially of the dorsal valve, and a much smaller beak. It is larger than any measured specimen of Z. spiculata ( Fig. 9 D View FIGURE 9 , MacFarlan 2021). It has much less resemblance to the other Zealandian Late Triassic and Jurassic zeilleriides.