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Dactylogonia incrassata
Taxonomy
Leptaena incrassata was named by Hall (1847).
It was recombined as Rafinesquina incrassata by Schuchert (1897); it was recombined as Dactylogonia incrassata by Cooper (1956).
It was recombined as Rafinesquina incrassata by Schuchert (1897); it was recombined as Dactylogonia incrassata by Cooper (1956).
Sister species lacking formal opinion data
Synonymy list
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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.
†Dactylogonia incrassata Hall 1847
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell fairly large for the genus, wider than .long, with the hinge width almost twice the length; cardinal extremities alate; strongly geniculate; angle of geniculation variable; surface marked by strong and fine costellae, about 5 of the latter in 5 mm. at the front margin and about 7 fine costellae separating the larger ones. Fine costellae strongly cancellated by fine concentric lines.
Pedicle valve with variable lateral profile, the visceral portion varying from fiat to gently convex, the geniculated part from narrowly convex. Trail nearly fiat to gently convex and varying in angle of geniculation from 60° to I00°. Geniculation occurring 6 or 7 mm. anterior to the beak. Geniculated part narrowly to roundly convex depending on angle of geniculation. Umbonal and median regions somewhat swollen; flanks of visceral part somewhat depressed. Interarea moderately long; pseudodeltidium large and convex. Brachial valve with visceral part gently concave, with the median region the deepest part and the flanks somewhat flattened. Trail moderately long, slightly concave; adductor plates strongly developed. |
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Nesnidal et al. 2013 | |||||
Age range: base of the Chazyan to the top of the Blackriveran or 471.30000 to 449.60000 Ma
Collections (32 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Chazyan | USA (Vermont) | Leptaena incrassata (101749) | |
| Chazyan | Canada (Ontario) | Rafinesquina incrassata (172356) | |
| Chazyan | Canada (Quebec) | Leptaena incrassata (186175) Rafinesquina incrassata (172209 172351) | |
| Chazyan | USA (New York) | Leptaena incrassata (172144 172180 172184 172199) Rafinesquina incrassata (171704 171798 172226 172232 172233 172234 172235 172239 172240 172316 172317 172318 172319 172320 172330 172331 172336 172346 172347 172348) | |
| Blackriveran | USA (Tennessee) | Rafinesquina incrassata (5328 5329 5331) |