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Landyia
Taxonomy
Landyia was named by Jell (1985) [Sepkoski's age data: O Trem-l].
It was assigned to Pilekiidae by Jell (1985) and Jell and Adrain (2002); to Phacopida by Sepkoski (2002); and to Pilekiinae by Perez-Peris et al. (2021).
It was assigned to Pilekiidae by Jell (1985) and Jell and Adrain (2002); to Phacopida by Sepkoski (2002); and to Pilekiinae by Perez-Peris et al. (2021).
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1985 | Landyia Jell p. 75 |
| 2002 | Landyia Jell and Adrain p. 395 |
| 2002 | Landyia Sepkoski |
| 2021 | Landyia Perez-Peris et al. p. 859 |
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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. †Landyia Jell 1985
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. A. Jell 1985 | Small pilekiid with highly convex anterior profile; glabella tapering very slightly forward to broadly rounded anterior, with three pairs of sharp slit-like lateral furrows; glabellar furrows at low angle to transverse line for most of their width but curving strongly posteriorly in most adaxial part, with 3p having short often indistinct anterior fork or expansion; palpebral lobes short, far from axial furrow; posterior cephalic limb long and wide. Thorax of 13 segments; pleurae with sharp, slitlike pleural furrows running along the midlength of the segment for most of course, fading out just beyond articulating line; pleural tips broad, flat, curved posteriorly, with posterolateral projection into short spine.
Pygidium with axis of four rings and long triangular terminus reaching posterior margin but otherwise entirely enclosed by fourth pygidial segment; pleural and interpleural furrows sharp and slit-like; interpleural furrows running to margin; posterolateral corners of segments extended into short flat spines, with spines becoming longer on more posterior segments. |