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Fritzolenellus
Taxonomy
Fritzolenellus was named by Lieberman (1998).
It was assigned to Laudoniinae by Lieberman (1999); and to Olenellidae by Jell and Adrain (2002).
It was assigned to Laudoniinae by Lieberman (1999); and to Olenellidae by Jell and Adrain (2002).
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1998 | Fritzolenellus Lieberman |
| 1999 | Fritzolenellus Lieberman p. 90 |
| 2002 | Fritzolenellus Jell and Adrain p. 377 |
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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. †Fritzolenellus Lieberman 1998
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†Fritzolenellus lapworthi Peach and Horne 1892
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Invalid names: Olenellus intermedius Peach 1894 [synonym]
†Fritzolenellus reticulatus Peach 1894
†Fritzolenellus truemani Walcott 1913
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. S. Lieberman 1999 | Anterior cephalic border developed as raised ledge; anterior border promi- nently separated from extraocular area by furrow; plectrum absent; anterior part of glabella prominently separated from anterior extraocular area by furrow (not anterior bor- der furrow); prominent parafrontal band not visible in dorsal view; anterior margins of frontal lobe at each side of midline deflected posteriorly at roughly 40 degree angle relative to transverse line; length (sag.) of L4 equal to roughly 1.5 times length (sag.) of L0 and L1; L4 expands prominently dorsally; lateral margins of L4 distal to lateral margins of L0; pre-ocular furrow on frontal lobe directed inward and forward from glabellar margin; an- terolateral margins of ocular lobe separated from extraocular area by prominent furrow; ocular lobe with prominent ocular furrow; line from posterior tip of ocular lobe to junc- tion of posterior margin of lobe with glabella forms roughly 10 to 15 degree angle with sagittal line; transverse profile of ocular lobes convex dorsally; surface of interocular area arched; width (tr.) of interocular area approximately equal to maximum width of ocular lobe; anterodistal margins of L3 formed by ocular lobe; distal margins of L3 convex out- ward; S3 jaggedly convex, conjoined medially; line between ends of S2 transverse; L2 and L3 do not merge; S2 convex anteriorly; distal margins of L2 when proceeding anteriorly di- verging; distal sector of S0 convex anteriorly, well anterior of proximal end; posterior mar- gin of L0 roughly transverse; lateral lobes on L0 present; extraocular area flattened, width (tr.) roughly equal to 75% width of glabella at L1; length (exsag.) of genal spine roughly equal to length (sag.) of first four to five thoracic segments; genal spine angle developed opposite medial part of distal margin of L0; intergenal angle developed posterior of point half way between ocular lobes and genal spine; intergenal angle roughly parallel to trans- verse line; medial part of posterior border between intergenal angle and L0 roughly trans- verse; thorax broken up into pro- and opisthothorax; anterior margin of T3 before flexing strongly posteriorly roughly parallel to transverse line; T3 macropleural, projects posteri- orly 6 to 8 thoracic segments; anterior margin of thoracic pleural furrow on T3 when pro- ceeding from proximal to distal edge directed weakly posteriorly, before flexing strongly posteriorly; posterior margin of thoracic pleural furrow on T3 directed evenly posterolat- erally; thoracic pleural spines on T5 to T8 developed as broad sweeping projections ex- tending roughly four segments back; prothoracic axial rings without prominent lateral fur- rows; single nodes very faint, but present on median portion of some thoracic axial rings; thoracic pleural furrows extend width of inner pleural region; boundary between thoracic pleural furrow and anterior band sharp; thoracic pleural furrows short (exsag.), length equal to roughly half length (exsag.) of posterior band; thoracic pleural spines T5 to T8 at spine midlength with width (tr.) one half to two-thirds length (exsag.) of medial part of inner pleural region; prominent spine on 15th thoracic axial ring of length (sag.) of entire prothorax, base of spine nearly as wide (tr.) as axis of segment; segments of opisthothorax with prominent pleurae; pygidium with length (sag.) equal to width (tr.); posterior mar- gin of pygidium weakly convex (only some of these thoracic characters, and none of the pygidial characters, could be determined in F. lapworthi; none of the pygidial characters could be determined in F. reticulatus). |
Measurements
No measurements are available
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| Source: f = family, o = order, c = class | |||||
| References: Hendy et al. 2009, Aberhan et al. 2004, Whittington et al. 1997 | |||||
Age range: base of the Duyunian to the top of the Middle Cambrian or 514.00000 to 497.00000 Ma
Collections (19 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Cambrian | Canada (Northern Territories) | F. hanseni (228650) | |
| Dyeran | Canada (British Columbia) | Olenellus truemani (10859 10863) | |
| Dyeran | Canada (Newfoundland) | F. lapworthi (195911 195912) Olenellus lapworthi (196374) | |
| Dyeran | Canada (Alberta) | Olenellus truemani (10867 10877 10878 10879 10880 10881) | |
| Dyeran | Greenland | Olenellus truemani (225140) | |
| Duyunian | Greenland | Olenellus truemani (225102) | |
| Middle Cambrian | Greenland | F. truemani (193552 193553 193554 193555 193556) |