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Helochelydra anglica
Taxonomy
Platychelys anglica was named by Lydekker (1889). Its type specimen is NHMUK 48357, a carapace (left posterolateral portion of a carapace), and it is a 3D body fossil. Its type locality is Durlston Bay (general) [Beckles Collection], which is in a Berriasian lagoonal/restricted shallow subtidal horizon in the United Kingdom.
It was recombined as Compsemys anglica by Joyce et al. (2011); it was considered a nomen dubium by Bräm (1965); it was recombined as Helochelydra anglica by Milner (2004), Joyce (2017).
It was recombined as Compsemys anglica by Joyce et al. (2011); it was considered a nomen dubium by Bräm (1965); it was recombined as Helochelydra anglica by Milner (2004), Joyce (2017).
Synonymy list
| Year | Name and author |
|---|---|
| 1889 | Platychelys anglica Lydekker p. 217 fig. 49 |
| 1958 | Platychelys anglica Delair p. 50 |
| 2004 | Helochelydra anglica Milner p. 1458 figs. Text-figures 5C, 7B, 8C, 11 |
| 2011 | Compsemys anglica Joyce et al. p. 80 |
| 2017 | Helochelydra anglica Joyce |
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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.
†Helochelydra anglica Lydekker 1889
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. R. Milner 2004 | Purbeck material growing to carapace length of 0·33 m. Species of Helochelydra in which the hyoplastron has the following characters: ventral surface covered with low discrete tubercles; border with entoplastron is concave, suture with epiplastron is perpendicular to antero-posterior axis; suture with entoplastron occupies one-third of width of anterior ramus of hyoplastron; medial border between humeral and pectoral scutes is perpendicular to midline and passes about 8 mm behind posterior end of entoplastron. | |
| W. G. Joyce et al. 2011 | ‘Ventral surface covered with low discrete tubercles; border with entoplastron is concave, suture with epiplastron is perpendicular to anteroposterior axis; suture with entoplastron occupies one-third of width of anterior ramus of hyoplastron; medial border between humeral and pectoral scutes is perpendicular to midline and passes about 8 mm behind posterior end of entoplastron’ (Milner 2004, p. 1458). |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Hendy et al. 2009, Carroll 1988 | |||||
Age range: Berriasian or 145.00000 to 139.80000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Berriasian | United Kingdom (England) | Tretosternum bakewelli (92915 127480) |