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Lapworthura
Taxonomy
Lapworthura was named by Gregory (1897) [Sepkoski's age data: O u D Sieg-l]. It is not extant. Its type is Protaster miltoni. It is the type genus of Lapworthuridae. It was considered monophyletic by Dean Shackleton (2005).
It was assigned to Hallasteridae by Spencer (1925); to Oegophiurida by Sepkoski (2002); to Protasteridae by Dean Shackleton (2005); and to Lapworthuridae by Schuchert (1915), Owen (1965), Spencer and Wright (1966) and Glass and Poschmann (2006).
It was assigned to Hallasteridae by Spencer (1925); to Oegophiurida by Sepkoski (2002); to Protasteridae by Dean Shackleton (2005); and to Lapworthuridae by Schuchert (1915), Owen (1965), Spencer and Wright (1966) and Glass and Poschmann (2006).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1897 | Lapworthura Gregory p. 1037 |
| 1915 | Lapworthura Schuchert pp. 250-251 |
| 1925 | Lapworthura Spencer pp. 301-302 |
| 1965 | Lapworthura Owen p. 555 |
| 1966 | Lapworthura Spencer and Wright p. U88 |
| 2002 | Lapworthura Sepkoski |
| 2005 | Lapworthura Dean Shackleton p. 87 |
| 2006 | Lapworthura Glass and Poschmann p. 971 |
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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. †Lapworthura Gregory 1897
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†Lapworthura lehmanni Glass and Poschmann 2006
†Lapworthura miltoni Salter 1857
†Lapworthura sollasi Spencer 1914
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Dean Shackleton 2005 | Distal margin of ambulacrals in oral view strongly inclined; oral inclined groove running along distal part of perradial region of ambulacral; madreporite large and highly crenulated; first and second buccal pores closely spaced with proximal pore slightly smaller and raised aborally. | |
| A. Glass and M. Poschmann 2006 | Disc circular. Arms low, flexible, broad, and uniform in width inside and just distal to the disc but tapering evenly toward the tips. Dorsal ambulacrals rectangular, paired across the midline of the arm, and probably unfused (see discussion below). Podial basins large.
Laterals curve around the podial basins and attach to the ambulacrals by an elongated process. Vertical spines long and of nearly equal length, some as long as three arm segments. Spines set in rows at wide angles to the arm axis (see ‘Remarks’ below). Madreporite is ventral. |