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Leangella (Leangella) anatoli
Taxonomy
Diambonia anatoli was named by Spjeldnaes (1957). Its type specimen is PMO 66985, a valve (cast of a dorsal interior), and it is a 3D body fossil.
It was recombined as Leangella (Leangella) anatoli by Candela and Harper (2014).
It was recombined as Leangella (Leangella) anatoli by Candela and Harper (2014).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1957 | Diambonia anatoli Spjeldnaes pp. 80 - 81 figs. Pl. 2, figs. 6-8, texfig. 11 R |
| 1962 | Diambonia anatoli Williams p. 173 figs. P1. XVI, figs. 18-24 |
| 2014 | Leangella (Leangella) anatoli Candela and Harper pp. Supplement 1 |
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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.
†Leangella (Leangella) anatoli Spjeldnaes 1957
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| N. Spjeldnaes 1957 | An adult specimen of average size is 5 mm wide and 4 mm long. The specimens are strongly concave-convex, of variable shape, mostly rounded triangular. Ventral area low triangular, delthyrium narrow, 45°, the development of the pseudodeltidium depends on the age of the specimen, being hardly visible in young ones, and large in the older. The dorsal area is rectangular and comparatively high. Chilidal plates small, cardinal process trifurcate. Both areas are slightly concave, the angle between them is about 180° in young specimens, and considerably less in older ones.
The sculpture consists of 5-7 radii. Striae are only faintly indicated on a few specimens. The ventral interior is dominated by the di verging muscle impressions, the border of which is dentated in most specimens. The adductor muscle impressions are elongated pyriform. There is always a median septum, but it varies as to length and depth. In old specimens it tends to be flatly wedge-shaped. In most specimens there is a groove parallel to the margin of the shell, corresponding to the diaphragm of the dorsal valve. One gerontic valve has a strong, smooth bounding ridge around the muscle impressions, and a very narrow adductor impression. In this it resembles Leangella, but it differs from it in the elongated outline of the diverging muscle impressions. The vascular system is remarkably similar to that of certain dalmanellids (textfig. 11R). It consists of two pairs of main vascula, the v. dentalia, which have two large branches, and v. spondylaria. All four vasculae branch frequently without forming a vascular arch. No ovarian impressions are found. Dorsal interior with coherent branchial lamellae with a strong median sulcus, and rounded outline. Socket plates strong, highest at the ends. Diaphragm strongly developed, placed comparatively far from the margin. It has a slightly more triangular outline than the valve. | |
| A. Williams 1962 | Subquadrate, evenly concavo-convex Diambonia with a broadly rounded anterior margin, pedicle valve about three-quarters as long as wide, and two-fifths as deep as long; very finely parvicostellate with up to 7 costae very strongly accentuated, especially a median and 2 or 3 pairs of divergent sublateral costae; ventral muscle-field subcordate, about one-quarter as long as the pedicle valve and about threequarters as wide as long, divided medianly by a strong ridge projecting dorsally and bifurcating posteriorly, possibly to contain a lanceolate adductor impression; median septum blade-like, arising anterior to the scar and about one-fifth of the length of the valve; ventral vascula media simple, slightly divergent, widely spaced, lophophore platform elevated and indented medianly with pointed antero-lateral margins, about two-fifths as long as the brachial valve and about three-fifths as long as wide; subperipheral rim more or less concentric to the dorsal commissure, narrowly rounded antero-medianly. |
Measurements
No measurements are available
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| Source: g = genus, f = family, c = class, p = phylum, uc = unranked clade | |||||
| References: Hendy et al. 2009, Hendy 2009, Nesnidal et al. 2013, Aberhan et al. 2004 | |||||
Age range: base of the Burrellian to the top of the Keila or 456.60000 to 452.80000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Haljala - Keila | Norway (Asker) | Diambonia anatoli (194736) | |
| Haljala - Keila | Norway (Oslo-Asker) | Diambonia anatoli (194769) | |
| Burrellian | United Kingdom (Scotland) | Diambonia anatoli (165050 192745) |