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Platanasteridae

Asteroidea - Euaxosida - Platanasteridae

Taxonomy

Platanasteridae was named by Spencer (1919).

It was synonymized subjectively with Palasteriscidae by Owen (1965).

It was assigned to Asteroidea by Spencer (1919); to Platyasterida by Lehmann (1957); and to Euaxosida by Blake (2018).

Subtaxa

Foliaster, Lanthanaster, Palaebrisingidae, Palaechinasteridae, Palasteriscinae, Phyrtosaster, Platanaster

Sister taxa

Palaebrisingidae, Palaechinasteridae

Synonyms

Palasteriscidae was named by Gregory (1900). It is not extant. Its type is Palasteriscus.

It was synonymized subjectively with Platanasteridae by Blake (2018).

It was assigned to Schuchertiacea by Schuchert (1915); to Asteroidea by Gregory (1900) and Dean Shackleton (2005); and to Platyasterida by Owen (1965), Spencer and Wright (1966), Blake (1989), Blake (1994), Blake (2007) and Blake and Rozhnov (2007).
Palaebrisingidae was named by Stürtz (1890).

It was considered an invalid subgroup of Palasteriscidae by Schuchert (1915).
Palaechinasteridae was named by Stürtz (1890). Its type is Echinasterella.

It was considered an invalid subgroup of Palasteriscidae by Schuchert (1915); it was considered an invalid subgroup of Platanasteridae by Spencer (1919).

It was assigned to Gnathasterina by Lehmann (1957).

Synonymy list

Year	Name and author
1890	Palaebrisingidae Stürtz p. 246
1890	Palaechinasteridae Stürtz pp. 246-247
1900	Palasteriscidae Gregory p. 257
1915	Palasteriscidae Schuchert pp. 163, 199
1919	Platanasteridae Spencer pp. 169-171
1957	Platanasteridae Lehmann pp. 77-78
1957	Palaechinasteridae Lehmann p. 115
1965	Palasteriscidae Owen p. 559
1966	Palasteriscidae Spencer and Wright p. U42
1989	Palasteriscidae Blake p. 212
1994	Palasteriscidae Blake p. 125
2005	Palasteriscidae Dean Shackleton p. 94
2007	Palasteriscidae Blake p. 1477
2007	Palasteriscidae Blake and Rozhnov p. 521
2018	Platanasteridae Blake p. 49

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
—	Ambulacraria
phylum	Echinodermata

Rank	Name	Author
subphylum	Eleutherozoa
—	Asterozoa	()
class	Asteroidea
order	Euaxosida
family	Platanasteridae
family	Platanasteridae

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.

Fm. †Platanasteridae Spencer 1919

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G. †Lanthanaster Branstrator 1972

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†Lanthanaster cruciformis Branstrator 1972

G. †Phyrtosaster Blake 2007

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†Phyrtosaster casteri Blake 2007

G. †Platanaster Spencer 1919

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†Platanaster ordovicus Spencer 1919

Invalid names: Palasteriscidae Gregory 1900 [synonym]

Diagnosis

Reference	Diagnosis
J. Dean Shackleton 2005 (Palasteriscidae)	Ambulacral proximal podial flange with tongue overlapping distal flange; adambulacrals lateral with respect to ambulacrals; madreporite in contact with inferomarginal; madreporite no longer dorsal to inferomarginals; inferomarginals form ambitus; buccal slits; axillary not subrectangular.
D. B. Blake 2007 (Palasteriscidae)	Five-armed asteroids. Abactinals paxilliform, aligned in series; primary circlet not recognized; carinal series at most weakly differentiated. Marginals absent, or in one, or two series. Actinal ossicles few to many. Actinal surface of ambulacrals recessed above actinal surface of adambulacrals. Adambulacrals upright and overlapping, articular flanges small. Ambulacrals square to slightly wider than long. Ambulacral radial canal forming broad, concave surface, although axial channel can be deep. Cross-furrow articular structures gracile. Adambulacrals wider than ambulacrals; adambulacrals prolonged adradially to form nose; articular surface between adambulacral, ambulacral comparatively small so that ambulacral at most only weakly overlaps adambulacral. Skeletal gap present. Buccal slit present. Axillary present, either large or small.