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Prosimnia blackae
Taxonomy
Prosimnia blackae was named by Beu and Marshall (2011) [Simnia sp. Cernohorsky 1971: 127, fig. 19.]. Its type specimen is G7102, a shell, and it is a 3D body fossil. Its type locality is small disused quarry, north side of Mititai-Tauraroa Road, which is in an Otaian intrashelf/intraplatform reef sandstone in the Pakaurangi Formation of New Zealand.
Synonymy list
| Year | Name and author |
|---|---|
| 2011 | Prosimnia blackae Beu and Marshall pp. 22 - 24 fig. 4C |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Prosimnia blackae Beu and Marshall 2011
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. G. Beu and B. A. Marshall 2011 | Holotype (only known specimen) an internal mould; exterior characters not visible. Shell small for genus, long and narrow (width 31% of height), an almost cylindrical rod with a near-cylindrical central, expanded section about half total length, contracting slightly but sharply to a narrower rostrum at each end. Last teleoconch whorl enclosing entire earlier shell. Both ends slightly incomplete, to an unknown degree. Aperture tall and narrow, extending entire length of shell; straight over central half of height, adapical section narrow and evenly slit-like, straight but inclined slightly to left; inner edge of outer lip expanded very slightly in towards inner lip in centre; aperture wider over anterior third of height, with weakly excavated columella and outer lip curved weakly to left. Cross-section evenly inflated except for dorsal slope behind outer lip, which is slightly flattened for last quarterwhorl, indicating a thickened, slightly flared lip on original shell; inner edge of thickening demarcated by low ridge on mould (shallow groove in original shell). Both lips completely smooth; outer lip evenly and smoothly enrolled, slightly wider at mid-point than above and below; shallow but obvious groove (ridge on original shell) extending from adapical end of central swelling to posterior end of shell, resulting from thickened former inner lip; shallowly concave mould of fossula present in posterior half of inner lip. Other internal characters of aperture not visible. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Kiessling 2004, Hendy et al. 2009 | |||||