| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Parastrophinella youngi
Taxonomy
Parastrophia youngi was named by Reed (1917) [Parastrophia Youngi].
It was recombined as Parastrophinella youngi by Williams (1962) and Candela and Harper (2014).
It was recombined as Parastrophinella youngi by Williams (1962) and Candela and Harper (2014).
Synonymy list
| Year | Name and author |
|---|---|
| 1917 | Parastrophia youngi Reed pp. 930 - 931 figs. Plate XXII, figs. 46, 47 |
| 1962 | Parastrophinella youngi Williams pp. 229 - 230 figs. Pl. XXIII, figs. 26, 31, 33 |
| 2014 | Parastrophinella youngi Candela and Harper pp. Supplement 1 |
Is something missing? Join the Paleobiology Database and enter the data
|
|
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.
†Parastrophinella youngi Reed 1917
show all | hide all
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. R. C. Reed 1917 | Shell more or less globose, subcircular; beaks approximate, subequal, swollen, obtuse. Pedicle-valve convex, with broad shallow median sinus arising at some distance from beak, with flattened floor continued as obtuse tongue bent down and entering other valve, and holding 2 equal angular plications arising at about half the length of valve ; anterior sides of sinus steep, with angular edges ; 2 or 3 short submarginal angular plications of decreasing strength on each lateral lobe. Brachial* valve very convex, swollen, with low broad median fold arising some distance in front of beak and composed of 3 coarse equal angular plications; 2 or 3 similar ones on each lateral lobe arising at about half the length of valve. Beak rather higher than that of opposite valve. Interior of brachial valve with elongated narrow spondylium nearly one-third length of valve, and thin median septum extending in front of it. Interior of pedicle-valve with minute spondylium and short median septum about one-third the length of valve. Surface of valves marked with concentric growth-lines. | |
| A. Williams 1962 | Transversely subcircular, strongly and unequally biconvex Parastrophinella with a tumid brachial valve, over four-fifths as long as wide and curving posteriorly above the level of the umbo of the pedicle valve, which is about three-fifths as deep as the brachial one; dorsal fold and complementary ventral sulcus arising about 4 mm. anterior to the umbones, fold tending to be flat-topped posteriorly but becoming more angular anteriorly with the development of a strong median costa; faint depressions on either side of the median costa exceptionally impressed to delineate an incipient pair of submedian costae between it and the lateral pair bounding the fold; lateral areas inflated and bearing up to 4 pairs of costae along the margins; spondylium small, tending to be sessile posteriorly; cruralium sessile posteriorly composed of high, narrowly divergent, outer plates, median septum extending anteriorly for just over onehalf of the length of the brachial valve. |
Measurements
No measurements are available
|
|
||||
|
|
||||
|
|
||||
|
|
||||
|
|
||||
|
|
||||
|
|||||
|
|
||||
|
|
||||
| Source: g = genus, o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Nesnidal et al. 2013, Hendy 2009 | |||||