Cisnerospira antipoda, Macfarlan, 2023

Macfarlan, Donald Alexander Bankier, 2023, Latest Triassic and Early Jurassic Spiriferinida (Brachiopoda) of Zealandia (New Zealand and New Caledonia), Zootaxa 5277 (1), pp. 1-58 : 15-18

publication ID	https://doi.org/ 10.11646/zootaxa.5277.1.1
publication LSID	lsid:zoobank.org:pub:9273881B-D09E-4958-B1CD-59E97339BF32
DOI	https://doi.org/10.5281/zenodo.7891512
persistent identifier	https://treatment.plazi.org/id/03AD87E3-FFC4-FF91-FF5D-56C83DDBC57A
treatment provided by	Plazi
scientific name	Cisnerospira antipoda
status	sp. nov.

Treatment

Cisnerospira antipoda new species

Fig. 8C View FIGURE 8 , Fig. 11 View FIGURE 11 : 1–8, Fig. 12: 1–5.

2009 ‘ Spiriferina’? n. sp. A; MacFarlan et al. 2009 p. 266.

Holotype. B695 a double-valved shelly specimen with some damage to the apex of the beak, from R15 /f8005, AU 9197, Dactylioceras band , Ururoa Point, Kawhia. Collected by A.B.S. Clarke, N. Hudson and J.A. Grant-Mackie 18 January 1981.

Derivation of name. While the type species is described from France, the modern work on this genus has had a Spanish focus. The new species is described from New Zealand, on the opposite side of the globe. The name antipoda seems appropriate.

Material. A total of 56 specimens from 27 localities were catalogued, of which 41 yielded valid measurements.

Kawhia Syncline. Dactylioceras band : R 15/f8005 (AU 9197, 12296,?AU 6425). Ururoa Point: R 15/f8006 ( GS 3150, AU 600), R 15/f8078 (AU 9203), R 15/f8575 (AU 9209, JDC 2509), R 15/f8686 (AU 599), R 15/f8816 (AU 50). Paparoa Point, Taharoa: R 16/f6811 (AU 154, 4394,?AU 8363, AU 9464). Marokopa: R 16/f8642 (AU 9469, R 16/f4648 ( GS 10035), R 16/f8840 (AU 4225). Pomarangai Road, Marokopa: R 16/f8811 (AU 9464). Awakino Gorge, lower quarry: R 17/f8565 (AU 330).

Southland Syncline. Otapiri Stream below junction with Taylors Stream: E45/f9568 ( JDC 1380). Conical Hill: E45/f9860 ( JDC 1837). Heale Ridge: E45/f085 (McF E49). Jewitt Road: E46/f0056 ( JDC 2509, McF H25, E46/ f063 ( JDC 4661). Coneburn, Otamita Valley: F45/f8683 ( JDC 1393).

Mantle Grove: F46/f091 ( JDC 4664).

Description. Small spiriferinide, most specimens with ventral valve– 12 mm long, 7–13 mm wide. Outline semicircular, generally wider than long, with straight hingeline extending for most of valve length. Dorsal valve moderately and evenly convex. Hinge sockets broad, rounded.

Ventral valve hemiconical with high apex with narrow rounded tip and high, laterally convex, triangular interarea which on larger specimens overhangs the hingeline. No fold or sulcus, but anterior commissure may show shallow, rounded, poorly defined uniplication. Shell coarsely punctate, exterior smooth or with weak, irregular growth lines. Fine tubular spines are visible on some external moulds, ( Fig. 8C View FIGURE 8 , Fig. 12.3, 12.5a), but in most specimens are not preserved. Delthyrium open, triangular, bounded by high, narrow dental plates, median septum present from apex ( Fig. 11.3a, 11.8d View FIGURE 11 ).

Dimensions. Dimensions of the holotype and some other well-preserved specimens, and statistics for specimens from key areas are shown in Table 3 View TABLE 3 .

Range and distribution. This species is present in the Aratauran at Marokopa (R16/f8840), the Otapiri Valley (E45/f9568) and the Coneburn, Otamita Valley (F45/f8683). The earliest of these is F45/f8683, which is Middle Hettangian. It is moderately common in the Ururoan, especially the Upper Ururoan of Ururoa Point and Taharoa.. It is generally found in offshore sequences.

Remarks. The largest specimen from Paparoa Point, Taharoa (AU B687, Fig.11.3a–e View FIGURE 11 ) is almost twice the size of most Dactylioceras band specimens and is wider in proportion (possibly in part due to distortion). Otherwise there is little geographic variation in size.

This species is rectimarginate or with a shallow, poorly defined uniplication and no definite fold or sulcus. The type species, C. adscendens , is typically larger, with a strongly inflated dorsal valve, a strong rounded uniplication and a distinct fold and sulcus ( Baeza-Carratalá et al. 2016). Other species illustrated by Baeza-Carratalá et al. (2016) are also larger and have a well-developed uniplication.

Spiriferina cf. darwini is described by Wanner & Knipscheer (1951) from the Lower Jurassic of Seram in Indonesia and commented on by Baeza-Carratalá et al. (2016). It is slightly larger than the new species, with a deep rounded sulcus and uniplicate anterior commissure.