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Ehmaniella
Taxonomy
Ehmaniella was named by Resser (1937) [Sepkoski's age data: Cm mMid-u Sepkoski's reference number: 81]. It is not extant. Its type is Crepicephalus (Loganellus) quadrans. It is the type genus of Ehmaniellidae, Ehmaniellinae.
It was assigned to Ptychoparioidea by Palmer (1954); to Ehmaniellinae by Sundberg (1994); to Ptychopariida by Sepkoski (2002); to Alokistocaridae by Jell and Adrain (2002); and to Arthropoda by Caron and Jackson (2008).
It was assigned to Ptychoparioidea by Palmer (1954); to Ehmaniellinae by Sundberg (1994); to Ptychopariida by Sepkoski (2002); to Alokistocaridae by Jell and Adrain (2002); and to Arthropoda by Caron and Jackson (2008).
Species
Species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1937 | Ehmaniella Resser |
| 1939 | Anomalocephalus Deiss |
| 1939 | Clappaspis Deiss |
| 1954 | Ehmaniella Palmer p. 75 |
| 1994 | Ehmaniella Sundberg p. 53 |
| 2002 | Ehmaniella Jell and Adrain p. 465 |
| 2002 | Clappaspis Sepkoski |
| 2002 | Ehmaniella Sepkoski |
| 2008 | Ehmaniella Caron and Jackson p. 226 |
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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.
G. †Ehmaniella Resser 1937
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†Ehmaniella angustigena Sundberg 1994
†Ehmaniella burgessensis Rasetti 1951
†Ehmaniella casta Chien and Zhou 1974
†Ehmaniella fronsplanata Sundberg 1994
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†Ehmaniella fronsplanata concava Sundberg 1994
†Ehmaniella fronsplanata fronsplanata Sundberg 1994
†Ehmaniella fronsplanata convexa Sundberg 1994
†Ehmaniella quadrans Hall and Whitfield 1877
†Ehmaniella similis Zhang et al. 1980
†Ehmaniella waptaensis Rasetti 1951
†Ehmaniella whitei Robison and Babcock 2011
Invalid names: Anomalocephalus Deiss 1939 [synonym], Clappaspis Deiss 1939 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. R. Palmer 1954 | Cranidium with anterior margin gently and evenly rounded, glabella prominent, tapered for- ward, bluntly rounded anteriorly; dorsal furrow deep at sides, shallow across front. Four pairs of glabellar furrows visible on well-preserved specimens. Occipital furrow deep at sides, shallow on midline. Occipital ring with or without spine. Frontal area with distinct brim and border separated by shallow marginal furrow or by sudden change in slope; border maintains con- stant width; axial length of frontal area less than half that of glabella. Width of fixed cheeks about one-half that of glabella. Prominent ocular ridges present. These touch dorsal furrow opposite anterior pair of glabellar furrows. Palpebral lobes poorly defined by shallow palpebral furrow, depressed below general level of cheeks, opposite middle third of glabella. Length of posterior limbs about equal to width of glabella at occipital furrow. Anterior and posterior courses of facial sutures divergent from palpebral lobes; anterior course intramarginal on border nearly to axial line.
Free cheek with margin evenly rounded. Border narrower than ocular platform, well defined by shallow marginal furrow, extended into short, pointed genal spine. Thorax of 13 segments. Axial lobe prominent, narrower than pleural lobes. Distal ends of pleural lobes of each segment rounded or extended into short sharp spines. Pygidium with axial length one-half or more width. Axial lobe tapered posteriorly, not extended to posterior margin, composed of 3 to 5 segments. Pleural lobes with 2 or more pairs of pleural furrows and interpleural grooves of about equal strength; each pair of furrows directed more posteriorly than preceding pair. Border not present, but distal margins of downsloping pleural lobes flexed outward. Surface of carapace smooth. | |
| F. A. Sundberg 1994 | Ehmaniellinae with subrectangular cranidium with divergent facial su- tures anterior of palpebral lobes; moderate to long palpebral lobes (35-50% glabellar length); well-de- fined anterior border, narrow to moderate width (10-20% cranidial length), moderately to slightly tapered; preglabellar field sagittally narrow to moderately wide (30-60% frontal area length); moder- ately tapered glabella; bluntly rounded frontal lobe; exsagittally narrow posterior area of fixigenae (20- 35% glabellar length). Pygidium suboval to subrect- angular to alate with blunt axis; 3-4 axial rings; moderate depth pleural furrows; moderately con- vex posterior pleural bands; moderately convex to weak anterior pleural bands. |
Measurements
No measurements are available
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| Source: g = genus, f = family, c = class | |||||
| References: Hendy 2009, Caron and Jackson 2008, Aberhan et al. 2004 | |||||
Collections (51 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Cambrian | Argentina (San Juan ) | E. sp. (200108) | |
| Duyunian - Taijangian | China (Guizhou) | E. similis (107166 107173) | |
| Delamaran | Canada (British Columbia) | E. burgessensis (84412 84413 84414 84415 84416 84417 84418 84419 84420 84421 84422 84425 84426 84429 84430 84431 84432 84433 84434 84435 84436 84437) E. sp. (121959) E. waptaensis, E. burgessensis (84423 84424 84427 84428) | |
| Delamaran | USA (Nevada) | E. angustigena (134246) E. fronsplanata (134122) | |
| Delamaran | Mexico (Sonora) | E. sp. (90558) | |
| Delamaran | USA (Idaho) | Clappaspis sp., E. sp. (207) Clappaspis spencei, Clappaspis idahoensis, Clappaspis lanata, Clappaspis coriacea, Clappaspis dotis (76096) | |
| Delamaran | USA (Utah) | E. quadrans (269) | |
| Solvan | Greenland | E. tupeqarfik (219264) | |
| Middle Cambrian | Canada (British Columbia) | E. sp. (171308 171309) | |
| Middle Cambrian | USA (Utah) | E. sp. (64530 64531) | |
| Middle Cambrian | Canada (Newfoundland) | E. cloudensis (196377) | |
| Middle Cambrian | USA (California) | E. sp. (226272) | |
| St Davids | Canada (British Columbia) | E. sp. (215) E. waptaensis, E. burgessensis (122094) | |
| Tuesaian | Kazakhstan | E. karatauica (118054) | |
| Marjumian | Canada (Newfoundland) | E. cloudensis (195764) E. sp., E. cloudensis (195765) | |
| Marjumian | USA (Utah) | E. whietei (230682) | |
| Wangcunian | China (Guizhou) | E. casta (107324) | |
| Merioneth | USA (Idaho) | E. sp. (198) |