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Elrathia

Trilobita - Ptychopariida - Alokistocaridae

Synonymy list
YearName and author
1924Elrathia Walcott
1954Elrathia Palmer p. 78
2002Elrathia Sepkoski
2008Elrathia Briggs et al. p. 249
2008Elrathia 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
genusElrathiaWalcott 1924

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. †Elrathia Walcott 1924
show all | hide all
Elrathia grazierensis Rasetti 1965
Elrathia idahoensis Resser 1938
Elrathia kingi Meek 1870
Elrathia longiceps Resser 1938
Elrathia occidentalis Walcott 1884
Elrathia permulta Walcott 1918
Elrathia rara Resser 1939
Elrathia sampsoni Resser 1938
Elrathia spencei Resser 1939
Diagnosis
ReferenceDiagnosis
A. R. Palmer 1954Carapace elongate subovate in outline, widest at posterior margin of cephalon.
Cephalon subsemicircular in outline, genal angles extended into genal spines.
Cranidium with anterior margin gently and evenly rounded. Glabella well defined by shallow dorsal furrow, straight sided, tapered forward, strongly and evenly rounded anteriorly. Glabellar furrows shallow or absent. Occipital furrow deepest at sides, shallow on midline. Occipital ring flat or gently arched, un- spined. Frontal area with distinct brim and border; border flat or gently arched upward; marginal furrow shallow. Width of fixed cheeks one-half or more width of glabella. Paipebral lobes opposite middle third of glabella, well defined by shallow palpebral furrow. Ocular ridges indistinct. Length of posterior limbs about equal to width of glabella at occipital furrow. Marginal furrow broad, shallow. Facial sutures diver- gent anterior and posterior to paipebral lobs; anterior course turns inward after reaching border and cuts margin about midway between anterolateral corners of cranidium and axial line; posterior course cuts margin before reaching genal spine.
Free cheek with evenly curved lateral margin. Border well defined by shallow marginal furrow; ex- tended into short genal spine.
Thorax of 13 segments. Axial lobe prominent; width less than half that of pleural lobes. Pleural lobe of each segment subequally divided by deep pleural fur- row; distal extremity extended into short, sharp point.
Pygidium subsemicircular in outline, smaller than cephalon; axial length less than one-half width. Axial lobe prominent, not reaching posterior margin; width about one-half that of pleural lobes. Narrow border present, poorly defined by shallow marginal furrow. Furrows on axial and pleural lobes shallow.
Surface of carapace smooth.
Measurements
No measurements are available
Composition: low Mg calcitec
Composition 2: chitinc
Entire body: yesg
Adult length: 10 to < 100g
Adult width: 10 to < 100g
Ribbing: noneg
Spines: noneg
Ontogeny: molting, addition of partsc
Environment: marinec
Locomotion: fast-movingg
Life habit: epifaunalg
Diet: detritivoreg
Vision: well-developedf
Comments: Epifaunal vagrant deposit feeder (Caron & Jackson, 2008).g
Created: 2008-10-19 08:19:11
Modified: 2009-10-08 00:44:56
Source: g = genus, f = family, c = class
References: Caron and Jackson 2008, Hendy 2009, Aberhan et al. 2004

Age range: base of the Delamaran to the top of the Marjumian or 513.00000 to 498.50000 Ma

Collections (66 total)


Time interval Ma Country or state Original ID and collection number
Cambrian541.0 - 485.4USA (Georgia) E. sp. (164675)
Delamaran513.0 - 505.0Canada (British Columbia) E. permulta (84418 84420 84428 84431 84434 84435)
Delamaran513.0 - 505.0USA (Idaho) E. offula, E. spencei, E. rara (76096) E. sp. (207)
Menevian513.0 - 501.0Greenland (Peary Land) E. omega (49485 49488)
Middle Cambrian513.0 - 501.0Canada (Newfoundland) E. quebecensis (196377)
Middle Cambrian513.0 - 501.0USA (Idaho) E. idahoensis (127486) E. sampsoni, E. longiceps (127485)
Middle Cambrian513.0 - 501.0USA (Alaska) E. alaskensis (64765)
Middle Cambrian513.0 - 501.0USA (Utah) E. kingii (77267 77268 77269 77270 77272 80127) E. sp. (64534 86730 86734 86735 86736 86737 86740)
Solvan513.0 - 501.0Canada (Newfoundland and Labrador) E. kindlei (10814 10816 10819 10820 10826) E. kinlei, E. parallela (10827)
Solvan - Menevian513.0 - 501.0USA (Pennsylvania) E. grazierensis (8597)
St Davids513.0 - 501.0Canada (British Columbia) E. alapyge (122072) E. permulta (215)
St Davids513.0 - 501.0USA (Utah) E. sp. (216)
St Davids513.0 - 501.0USA (Idaho/ Utah) E. dubia (218)
St Davids513.0 - 501.0United Kingdom (Shropshire) Solenopleura angustiora (55509)
St Davids513.0 - 501.0India (Jammu) E. chuwansis (46472)
St Davids513.0 - 501.0Greenland E. sp. (10478)
Marjumian513.0 - 498.5USA (Utah) E. kingii (56144 164714 230682) E. marjumi (230679)
Marjumian513.0 - 498.5Canada (Newfoundland) E. sp. (195677 195765)
Marjumian513.0 - 498.5Greenland (Peary Land) E. omega (49434 49449 49450 49453 49483)
Marjumian513.0 - 498.5USA (Georgia) E. antiquata (8390 8391 8395 8396 8397 8398 8583) E. sp. (64483 64484 64486)
Merioneth501.0 - 485.4USA (Arizona) E. sp. (205 210)
Merioneth501.0 - 485.4USA (Vermont) E. sp. (217)