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Aphelaspis haguei
Taxonomy
Crepicephalus (Loganellus) haguei was named by Hall and Whitfield (1877). Its type specimen is USNM 24660 and is a 3D body fossil.
It was recombined as Ptychoparia haguei by Walcott (1884); it was recombined as Elrathia haguei by Resser (1935); it was recombined as Aphelaspis haguei by Palmer (1965), Stitt and Perfetta (2000).
It was recombined as Ptychoparia haguei by Walcott (1884); it was recombined as Elrathia haguei by Resser (1935); it was recombined as Aphelaspis haguei by Palmer (1965), Stitt and Perfetta (2000).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1877 | Crepicephalus (Loganellus) haguei Hall and Whitfield p. 210 figs. pi. 2, figs. 14, 15 |
| 1884 | Ptychoparia haguei Walcott p. 57 |
| 1935 | Elrathia haguei Resser p. 28 |
| 1965 | Aphelaspis haguei Palmer pp. 59 - 60 figs. Plate 9, figures 19-26 |
| 2000 | Aphelaspis haguei Stitt and Perfetta p. 220 figs. 12.6–12.8, 12.11–12.20 |
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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.
†Aphelaspis haguei Hall and Whitfield 1877
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. R. Palmer 1965 | Cranidium having glabella well defined by axial furrows; preglabellar furrow and prominent fossulae generally best defined in members of younger populations. Frontal area has well-defined bri~ and border; brim moderately to strongly convex sagittally, makes distinct angle with border; border flat or slightly convex; sagittal length slightly less ~han length of brim. Fixed cheeks slightly upslop1ng; palpebral lobes moderately defined by shallow palpebral furrow.
Free cheek has moderately broad border and slender genal spine extending posteriorly to about fifth thoracic segment. Lateral border furrow moderately to poorly formed. Thorax composed of 12 or 13 segments. Pleural tips short, sharp, directed posterolaterally. Pygidium has well-defined axis bearing two or three ring furrows behind articulating furrow. Pleural fields moderately convex and have one or two moderately well-defined pleural furrows. Border separated from pleural field principally by change in slope; border narrow behind axis, abruptly expanded laterally, flat or slightly concave, downsloping. External surfaces of cranidium and free cheek, except for furrows and genal spines, generally have distinct shallow pits visible after whitening. External surfaces of pygidium and tips of genal spines have fine granular ornamentation apparent only after whitening. Surfaces of molds of all parts pitted. |
Measurements
No measurements are available
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| Source: g = genus, f = family, c = class | |||||
| References: Aberhan et al. 2004, Hendy 2009, Whittington et al. 1997 | |||||
Age range: Steptoean or 497.00000 to 493.50000 Ma
Collections (19 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Steptoean | USA (South Dakota) | Aphelaspis haguei (7293 7376 7378 7397 7398 7399 7401 7685 8022) | |
| Steptoean | USA (Nevada) | Aphelaspis haguei (114592 114593) | |
| Dresbachian | Canada (Yukon) | Aphelaspis haguei (55223 55280 55282) | |
| Dresbachian | USA (South Dakota) | Aphelaspis haguei (7185 7194 7195) | |
| Furongian | USA (Utah) | Aphelaspis haguei (156409 156410) |