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Eogeryonidae
Taxonomy
Eogeryonidae was named by Ossó (2021).
It was considered an invalid subgroup of Portunoidea by Ossó (2016); it was considered an invalid subgroup of Tumidocarcinidae by Schweitzer et al. (2018).
It was assigned to Portunoidea by Ossó (2021).
It was considered an invalid subgroup of Portunoidea by Ossó (2016); it was considered an invalid subgroup of Tumidocarcinidae by Schweitzer et al. (2018).
It was assigned to Portunoidea by Ossó (2021).
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 2021 | Eogeryonidae Ossó p. 145 |
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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.
Fm. †Eogeryonidae Ossó 2021
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| À. Ossó 2021 | Carapace sub-hexagonal, medium sized, flattened, slightly wider than long, gently convex longitudinally at anterior third. Maximum width at anterior third, at level of third anterolateral tooth. Regions fairly defined. Gastric process poorly defined; mesogastric region not defined; protogastric lobes slightly swollen with transverse ridges; epigastric region medially depressed; epibranchial lobe sigmoidal, inflated, ridged; mesobranchial lobe inflated; metabranchial area depressed; urogastric region depressed; cardiac region slightly swollen. Cervical groove V shaped; branchiocardiac grooves deep. Front bilobed, lobes bifid. Orbits large, two supra-orbital fissures, eyestalks well calcified. Lateral margins strongly stepped. Anterolateral margins with four teeth (including exorbital tooth); first and second teeth strong, subtriangular; third tooth conical; fourth tooth (epibranchial) small blunt node. Posterolateral margins slightly convex. Posterior margin straight, rimmed laterally. Sternum relatively narrow; sternite 3 subrectangular; sternite 4 subtrapezoidal elongate, both slightly depressed medially; sternites 3-4 fused; suture 3/4 well distinct by a deep groove; sternites 5-6 subtrapezoidal, laterally downward directed. Episternites 4-5-6 downward directed. Male abdomen narrow, with 6 somites free and telson covering sterno-abdominal cavity; telson subtriangular reaching 2/3 of sternite 4, somite 4 the broader; somites 1 and 3 subtrapezoidal, transversally narrow, somite 2 not preserved; somites 4-5- 6, subrectangular becoming progressively narrower, somite 6 twice as high as 4 and 5. Right cheliped strong, smooth; merus massive, smooth; carpus massive, strong inner spine; propodus strong, smooth; dactyli with strong proximal molariform tooth followed by conical teeth. Ambulatory legs P2- P4 proportionally long, smooth, equal, sub-oval in section; P5 not preserved, appears to be smaller, probably subdorsal. |
Measurements
No measurements are available
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| Source: superf = superfamily, o = order, c = class | |||||
| References: Turnsek 1997, Fearon and Clapham 2023, Aberhan 1992 | |||||
Age range: Late/Upper Cenomanian or 99.60000 to 93.50000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Cenomanian | Spain | Eogeryon elegius (226411) | |
| Late/Upper Cenomanian | Spain (Guadalajara) | Eogeryon elegius (235311) |