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Hysteraster

Echinoidea - Spatangoida - Brissidae

Taxonomy
Hysteraster was named by McNamara (1992) [Sepkoski's age data: T Mi-l-u Sepkoski's reference number: 1242]. Its type is Hysteraster paragrapsimus.

It was assigned to Brissidae by McNamara (1992); and to Spatangoida by Sepkoski (2002).

Synonymy list
YearName and author
1992Hysteraster McNamara
2002Hysteraster Sepkoski, Jr.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Life
Ambulacraria
phylumEchinodermata
subphylumEchinozoa
classEchinoidea()
RankNameAuthor
subclassEuechinoideaBronn 1860
infraclassAcroechinoidea()
Carinacea
Irregularia()
Atelostomata
orderSpatangoida
suborderBrissidina
familyBrissidae
genusHysteraster

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
K. J. McNamara 1992Test moderately large, relatively narrow and with
slight anterior notch. Apical system set well anterior ofcentre; deeplydepressedinfemales.Petalsshort, broad and deeply depressed in females, only slightly depressed in males; do not extend to peripetalous fasciole; pore pairs very reduced in size in anterior rows of anterior petals; in all petals pore pairs absent in vicinity of apical system. Apical system ethmolytic with fourgonopores. Peripetalous andsubanal fascioles present. Aboral tubercles much larger within peripetalous fasciole than outside of it; those in interambulacra 2b and 3a are the largest and most sparsely distributed. Peristome subcentral. Plastron small, with prominent posterior keel. Periplastronal area wide.