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Ehmaniella

Trilobita - Ptychopariida - Alokistocaridae

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 Alokistocaridae by Jell and Adrain (2002); to Ptychopariida by Sepkoski (2002); and to Arthropoda by Caron and Jackson (2008).

Synonyms
Synonymy list
YearName and author
1937Ehmaniella Resser
1939Anomalocephalus Deiss
1939Clappaspis Deiss
1954Ehmaniella Palmer p. 75
1994Ehmaniella Sundberg p. 53
2002Ehmaniella Jell and Adrain p. 465
2002Clappaspis Sepkoski
2002Ehmaniella Sepkoski
2008Ehmaniella Caron and Jackson p. 226

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Ecdysozoa
Panarthropoda
phylumArthropodaLatreille 1829
RankNameAuthor
subphylumArtiopoda(Hou and Bergstrom)
classTrilobitaWalch 1771
subclassLibristoma
orderPtychopariidaSwinnerton 1915
familyAlokistocaridaeResser 1939
genusEhmaniellaResser 1937

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 casta Chien and Zhou 1974
Ehmaniella fronsplanata Sundberg 1994
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Ehmaniella quadrans Hall and Whitfield 1877
Ehmaniella similis Zhang et al. 1980
Ehmaniella waptaensis Rasetti 1951
Invalid names: Anomalocephalus Deiss 1939 [synonym], Clappaspis Deiss 1939 [synonym]
Diagnosis
ReferenceDiagnosis
A. R. Palmer 1954Cranidium 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 1994Ehmaniellinae 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.