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Trilobita - Phacopida - Pilekiidae

Landyia was named by Jell (1985) [Sepkoski's age data: O Trem-l].

It was assigned to Phacopida by Sepkoski (2002); and to Pilekiidae by Jell (1985) and Jell and Adrain (2003).

Species lacking formal opinion data

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Synonymy list
YearName and author
1985Landyia Jell p. 75
2002Landyia Sepkoski, Jr.
2003Landyia Jell and Adrain p. 395

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EubilateriaAx 1987
phylumArthropodaLatreille 1829
classTrilobitaWalch 1771
orderPhacopidaSalter 1864
familyPilekiidaeSdzuy 1955

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.

P. A. Jell 1985Small 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.