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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Protohemichenopus
Taxonomy
Protohemichenopus was named by Camacho (1953). Its type is Protohemichenopus neuquensis.
It was assigned to Aporrhaidae by Camacho (1953), Cataldo (2014).
It was assigned to Aporrhaidae by Camacho (1953), Cataldo (2014).
Species
P. neuquensis (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1953 | Protohemichenopus Camacho p. 184 |
| 2014 | Protohemichenopus Cataldo p. 1224 |
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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 | |
|---|---|---|
| Camacho 1953 | Teleoconch small, with the two first spire whorls smooth, then with a strong middle carina and sometimes with another, weaker one over the lower suture of the penultimate whorl. Last whorl frequently bicarinate, with a third, weaker carina and sometimes a fourth one, fine spiral cords, two thin processes and a strong callosity ascendent over the spire (translated from Camacho, 1953, p. 184). | |
| C. S. Cataldo 2014 | Protoconch obtusely conical to dome-shaped, with the two first whorls smooth and convex; towards two and a half whorls, fine spiral threads and collabral ribs appear gradually, forming a reticulate pattern in the first juvenile teleoconch whorls. Adult teleoconch small. Spire high, representing more than two-thirds of total shell height—excluding rostrum or anterior process. Spire whorls bicarinate, surface between carinae concave. Adapical carina located towards mid-whorl, more prominent; abapical carina close to the abapical suture. Last whorl tricarinate, the third carina very thin and close to the middle one. Outer lip extended into two long lateral processes continuous from the adapical and middle carinae of the last whorl. Posterior labral process adherent to the spire and surpassing it in length. Rostrum long, straight to more or less curved to the left. Fine spiral threads on spire and last whorl. Callus covering inner lip area and part of the apertural side of last whorl. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| Reference: Kiessling 2004 | |||||
Age range: base of the Hauterivian to the top of the Late/Upper Barremian or 132.60000 to 121.40000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Hauterivian | Argentina (Neuquen) | P. neuquensis (176969) | |
| Hauterivian | Chile (Coquimbo) | P. sp. (222464) | |
| Early/Lower Barremian | Chile (Copiapó) | P. neuquensis (223016) | |
| Late/Upper Barremian | Chile (Copiapó) | P. neuquensis (223062) |