Bibradya primitiva, Liu & Vachard & Cózar & Coronado, 2023

Liu, Chao, Vachard, Daniel, Cózar, Pedro & Coronado, Ismael, 2023, New species and evolution of the foraminiferal family Janischewskinidae in the middle-upper Mississippian of South China, Palaeontologia Electronica (a 2) 26 (1), pp. 1-27 : 14-15

publication ID

https://doi.org/ 10.26879/1238

publication LSID

lsid:zoobank.org:pub:C4AC62DE-5568-48BF-B9AE-B04DDFE2287A

DOI

https://doi.org/10.5281/zenodo.10987782

persistent identifier

https://treatment.plazi.org/id/81CE4253-CD52-455B-B1AC-494ABFA71371

taxon LSID

lsid:zoobank.org:act:81CE4253-CD52-455B-B1AC-494ABFA71371

treatment provided by

Felipe

scientific name

Bibradya primitiva
status

sp. nov.

Bibradya primitiva sp. nov.

Figure 9A‒F View FIGURE 9

zoobank.org/ 81CE4253-CD52-455B-B1AC-494ABFA71371

2022 Bibradya ? sp. 1― Cózar et al., fig. 10M.

Derivation of the Name. From its primitive features.

Material. Holotype ( HPU-KC81-399 , Figure 9A View FIGURE 9 ) and 11 paratypes ( Table 4 View TABLE 4 ).

Repository. School of Resources and Environment, Henan polytechnic University .

Type Locality and Horizon. Kacai section, Steshevian (early Serpukhovian).

Occurrence. Mikhailovian (late Viséan) to Steshevian (early Serpukhovian) in the Kacai section and up to the Zapaltyubian in the Shuidong section.

Diagnosis. Small Bibradya with swollen, blunt septa, and incipient bifurcation of septa for a low evolution rate of the test.

Description. Test free, small to moderate size, 490‒890 μm for specimens of 2‒3 whorls. The evolution rate is low and in some of the final chambers is even lower, showing a lower height of the lumen than that in the previous chambers. Height in the last chamber 70‒170 μm, H/D ratio very low, 0.10‒0.17 (0.26). Coiling is irregular, changing progressively the plane, and does not present any whorl completely in the same plane. Septa are blunt, swollen, and with incipient bifurcation, separating numerous chambers, usually 9-11 in the last whorl, but 8 chambers in specimens of only 2 whorls. Wall microgranular to granular, comparatively thick for the size of the specimens (20‒30 μm). Aperture cribrate.

Remarks. Differs from B. inflata ( Figure 4F View FIGURE 4 ) by a lower evolution rate, higher number of chambers, slightly higher number of whorls, less pronounced bifurcated septa, and more rudimentary cribrate apertures. The primitive characters of the species allow to distinguish it from the rest of more evolved Bibradya .

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