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Xenambonites revelatus
Taxonomy
Xenambonites revelatus was named by Williams (1962). Its type specimen is BB.26074, a valve (Internal mould of brachial valve), and it is a 3D body fossil. Its type locality is South bank of Penwhapple Burn, Penwhapple Glen, which is in a Burrellian offshore siltstone/conglomerate in the Balclatchie Formation of the United Kingdom.
Synonymy list
| Year | Name and author |
|---|---|
| 1962 | Xenambonites revelatus Williams pp. 191 - 192 figs. pl. XVIII, figs 21–23 |
| 2012 | Xenambonites revelatus Rasmussen et al. p. 28 figs. Plate 5, figures 21–24; Plate 6, figure 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.
†Xenambonites revelatus Williams 1962
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Williams 1962 | Large semi-oval Xenambonites with a brachial valve about one-half as long and one-fifth as deep as wide, dorsal median sulcus prominent, about three-fifths as wide as the length of the valve and bearing a short median fold anteriorly; geniculation sharp, forming a pair of sinusoidal curves impinging upon the hinge-line at about 75 ~ posteriorly and approaching the sulcus at about 4 mm. anterior to the umbo; ornamentation consisting of faint impersistent rugae and fine costellae, about I2 per millimetre, anteriorly, with a pair of thickened costellae bounding the sulcus and possibly a third conspicuous one along the median line; chilidial plates strong and widely divergent, socket ridges small, notothyrial platform elevated, lanceolate, bearing a low median cardinal process and continuous with a median ridge culminating in a sharp apex at the antero-median edge of a raised platform about two-fifths as long as the valve and about two-thirds as long as wide; adductor scars quadripartite, impressed on platform; vascula myaria impressed on valve floor, slightly divergent and dividing at the geniculate zones; pedicle valve unknown. | |
| C. M. O. Rasmussen et al. 2012 | Shell medium to large, strongly concavo-convex with lateral profile geniculate in ventral direction. Transverse, triangular outline. Maximum width at hinge line. Cardinal angles acute. Valves about 33% as long as wide. Ventral valve unevenly convex with a fold medianly. Interarea moderately high, wide, and apsacline. Delthyrium wide and open. Dorsal valve concave with pronounced, wide sulcus developed towards the anterior margin. Small dorsal fold variably developed medianly from within the umbonal zone to the anterior margin. Interarea low, wide and catacline. Chilidium covers about half of notothyrium. Finely unequally parvicostellate ornamentation, usually with 3–5 accentuated ribs and 12–14 parvicostellae per mm along anterior margin of mature specimens. Rugae, or concentric wrinkles, are developed anteriorly and laterally on some specimens.
Ventral interior with large teeth supported by divergent vestigal dental plates. Small ventral muscle scars elevated anteriorly. Platform surrounding muscle scars extends for 60% of valve length. Ribbed ridge dividing diductor muscle scars. Dorsal interior with undercut cardinal process. Strong socket ridges confined within small bilobed elevated bema. Weak ridges support the bema at an angle anterior to the bema. Dorsal median septum lacking. |
Measurements
No measurements are available
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| Source: f = family, o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Nesnidal et al. 2013, Hendy 2009 | |||||
Age range: base of the Burrellian to the top of the Cheneyan or 456.60000 to 451.30000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Ashbyan | USA (Alaska) | Xenambonites revelatus (164853) | |
| Burrellian | United Kingdom (Scotland) | Xenambonites revelatus (type locality: 192745) | |
| Cheneyan | United Kingdom (Scotland) | Xenambonites revelatus (164953) |