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Lapworthura

Ophiuroidea - Oegophiurida - Lapworthuridae

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).

Synonymy list
YearName and author
1897Lapworthura Gregory p. 1037
1915Lapworthura Schuchert pp. 250-251
1925Lapworthura Spencer pp. 301-302
1965Lapworthura Owen p. 555
1966Lapworthura Spencer and Wright p. U88
2002Lapworthura Sepkoski, Jr.
2005Lapworthura Dean Shackleton p. 87
2006Lapworthura Glass and Poschmann p. 971

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
phylumEchinodermata
RankNameAuthor
subphylumAsterozoa
classOphiuroidea
orderOegophiurida
suborderZeugophiurina()
familyLapworthuridae
genusLapworthura

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.

Diagnosis
ReferenceDiagnosis
J. Dean Shackleton 2005Distal 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 2006Disc 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.