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Megapetalus (heart urchin)
Taxonomy
Megapetalus was named by Clark (1929) [Sepkoski's age data: T Mi-u-u Sepkoski's reference number: 956,1242].
It was assigned to Spatangidae by Clark (1929) and Grant and Hertlein (1938); to Paleopneustidae by Zullo and Durham (1962); to Asterostomatidae by Fischer (1966); and to Spatangoida by Sepkoski (2002).
It was assigned to Spatangidae by Clark (1929) and Grant and Hertlein (1938); to Paleopneustidae by Zullo and Durham (1962); to Asterostomatidae by Fischer (1966); and to Spatangoida by Sepkoski (2002).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1929 | Megapetalus Clark p. 259 |
| 1938 | Megapetalus Grant and Hertlein p. 137 |
| 1962 | Megapetalus Zullo and Durham |
| 1966 | Megapetalus Fischer p. U622 |
| 2002 | Megapetalus Sepkoski |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. L. Clark 1929 | Test relatively long and narrow, and rather high. Oral surface flattened with the peristome only a trifle depressed and with a slight indicationofamediankeelininterambulacrum5. Ambulacrapetaloid
and dorsally very conspicuous; petals very broad, reaching nearly to ambitus, little contracted distally; anterior petal (III) evident but nar- rower than the others and with its sides more nearly parallel. Ambulacrum III slightly sunken at the ambitus, but hardly enough so to make the test cordiform. No indication of large tubercles in interambulacra. Abactinal system damaged, so that not even the number of genital pores is determinable. Periproct small, higher than wide, on posterior end of test, not depressed. |
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum | |||||
| References: Kiessling 2004, Aberhan 1992 | |||||
Age range: base of the Late/Upper Miocene to the top of the Messinian or 11.60800 to 5.33300 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Clarendonian | USA (California) | Megapetalus lovenoides (47432) | |
| Tortonian - Messinian | USA (California) | Megapetalus sp. (37549) | |
| Late/Upper Miocene | USA (California) | Megapetalus lovenioides (194096 200704) Megapetalus sp. (37547) | |
| Messinian | USA (California) | Megapetalus lovenioides (194099) |