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Valdivia (Valdivia) piriformis
Taxonomy
Valdivia (Valdivia) piriformis was named by Pretzmann (1968).
It was recombined as Sylviocarcinus piriformis by Rodríguez (1997), Feldmann et al. (2007), Schweitzer et al. (2010), Luque et al. (2017).
It was recombined as Sylviocarcinus piriformis by Rodríguez (1997), Feldmann et al. (2007), Schweitzer et al. (2010), Luque et al. (2017).
Synonymy list
| Year | Name and author |
|---|---|
| 1968 | Valdivia (Valdivia) piriformis Pretzmann |
| 1997 | Sylviocarcinus piriformis Rodríguez p. 63 fig. 4.1 |
| 2007 | Sylviocarcinus piriformis Feldmann et al. p. 78 |
| 2010 | Sylviocarcinus piriformis Schweitzer et al. p. 114 |
| 2017 | Sylviocarcinus piriformis Luque et al. p. 21 |
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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.
†Valdivia (Valdivia) piriformis Pretzmann 1968
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Rodríguez 1997 | The bifid tip of the immovable finger is present in all Trichodactylidae, and it has diagnostic value for the family. In some marine crabs there is, occasionally, an internal papilla, but it is arranged differently than of the Trichodactylidae. This is the case in all four species of Grapsidae, Sesarma curacaoense de Man 1892, Geograpsus lividus (Milne Edwards 1837), Hemigrapsus nudus (Dana 1851), and Goniopsis cruentata (Latreille 1803), where an internal papilla results from the division of the spoon-shaped tip found in other Grapsidae.
The chelipeds display the same general shape in almost all members of the family Trichodactylidae except in some aberrant cases such as old males of Trichodactylus fluviatilis Latreille 1828, Valdivia gila Pretzmann 1978, and Forsteria venezuelensis (Rathbun 1904), but the large tubercle on the outer surface of the movable finger is characteristic of the species. The number and position of the large teeth also tends to be constant for the species, but the number of small teeth may vary. In the fossil material the number of small cusps between the large teeth could be one or two, but in recent material examined by me (Rodríguez 1992), the number of small cusps vary from zero to three. Some small denticles may be present on the external surface at the base of the teeth. In recent specimens the chelipeds are strongly unequal. In old males the larger chela becomes enormously developed (hand >1.5 times as long as the carapace), and the fingers have a large gap between them. This last type of cheliped was not observed among the fossil material. |
Measurements
No measurements are available
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| Source: superf = superfamily, o = order, c = class | |||||
| References: Fearon and Clapham 2023, Aberhan 1992, Turnsek 1997 | |||||
Collections
No collection or age range data are available