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Haplistion
Taxonomy
Haplistion was named by Young and Young (1877) [Sepkoski's age data: O Cara P Guad-l Sepkoski's reference number: 1066]. It is not extant. It is the type genus of Haplistiidae.
It was assigned to Lithistida by Sepkoski (2002); and to Haplistiidae by Rigby and Mundy (2000) and Finks et al. (2004).
It was assigned to Lithistida by Sepkoski (2002); and to Haplistiidae by Rigby and Mundy (2000) and Finks et al. (2004).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1877 | Haplistion Young and Young |
| 2000 | Haplistion Rigby and Mundy p. 121 |
| 2002 | Haplistion Sepkoski |
| 2004 | Haplistion Finks et al. p. 141 |
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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. †Haplistion Young and Young 1877
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†Haplistion aeluroglossa Finks 1960
†Haplistion apletum Rigby et al. 1970
†Haplistion arcticum Dunikowski 1884
†Haplistion armstrongi Young and Young 1877
†Haplistion artiense Tshernyshev 1899
†Haplistion creswelli Rigby and Dixon 1979
†Haplistion cylindricum Rigby and Dixon 1979
†Haplistion diactinum Rigby and Terrell 1973
†Haplistion elongatum Siedlecka 1970
†Haplistion festningensis Siedlecka 1970
†Haplistion frustrum Rigby and Chatterton 1989
†Haplistion hadrum Hurcewicz 1982
†Haplistion latituba Dunikowski 1884
†Haplistion macroporum Dunikowski 1884
†Haplistion megalochetus Finks 1960
†Haplistion minutum Rigby and Dixon 1979
†Haplistion orientale Tshernyshev 1899
†Haplistion regularis Rigby and Webby 1988
†Haplistion skinneri King 1943
†Haplistion sphaericum Finks 1960
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. K. Rigby and D. J. C. Mundy 2000 | Massive to foliate sponges with radial architecture; skeletal net regular and open, composed of radial spicule tracts connected by horizontal tracts; tracts composed of dendroclones and smooth monaxons, in parallel orientation with smooth monaxons; a specialized dermal net of smooth monaxons may be present |