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Leptomitus
Taxonomy
Leptomitus was named by Walcott (1886) [Sepkoski's age data: Cm Atda-u Cm uMid-m Sepkoski's reference number: 766,858,883]. It is not extant. It is the type genus of Leptomitidae.
It was assigned to Poecilosclerida by Sepkoski (2002); to Demospongia by Bambach et al. (2007); and to Leptomitidae by Finks et al. (2004) and García-Bellido et al. (2007).
It was assigned to Poecilosclerida by Sepkoski (2002); to Demospongia by Bambach et al. (2007); and to Leptomitidae by Finks et al. (2004) and García-Bellido et al. (2007).
Species
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1886 | Leptomitus Walcott |
| 1920 | Tuponia Walcott |
| 2002 | Leptomitus Sepkoski |
| 2004 | Leptomitus Finks et al. p. 9 |
| 2007 | Leptomitus Bambach et al. p. S80 |
| 2007 | Leptomitus García-Bellido et al. pp. 469-472 |
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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. †Leptomitus Walcott 1886
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†Leptomitus conicus García-Bellido et al. 2007
†Leptomitus lineatus Walcott 1920
†Leptomitus minor Resser and Howell 1938
†Leptomitus teretiusculus Chen et al. 1989
†Leptomitus undulatus Rigby and Collins 2004
†Leptomitus zitteli Walcott 1886
Invalid names: Tuponia Walcott 1920 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. C. García-Bellido et al. 2007 | Elongate or goblet-shaped, tubular to obconical, very thin-walled sponges with double-layered skeleton. Coarse, moderately widely spaced, en echelon oxeas are dominant elements that extend as parallel rods virtually the entire length of the sponge in the outer skeletal layer. Spaces between rods filled with thatch of smaller
vertical oxeas that combine with coarse rods to produce the outer skeletal layer. Inner layer a thatch of tiny horizontal, monaxial spicules. Vertical small spicules do not occur in bundles, while horizontal spicules are not clustered or cluster into ill-defined bundles. Walls lack parietal gaps and major canals. |
Measurements
No measurements are available
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| Source: g = genus, c = class | |||||
| References: Bambach et al. 2007, Whittington et al. 1997, Kiessling 2004 | |||||
Age range: base of the Atdabanian to the top of the Marjumian or 521.00000 to 497.00000 Ma
Collections (44 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Cambrian | China (Yunnan) | L. teretiusculus (156226) | |
| Atdabanian | China (Yunnan) | L. sp. (86929 86930) L. teretiusculus (68083 90138 96402 96410 96412) | |
| Nangaoian | China (Yunnan) | L. teretiusculus (132327 132329 132330 194141 194143 194150 194160 194161 194163) | |
| Nangaoian | China (Guizhou) | L. sp. (128420) L. teretiusculus (128419 128421) | |
| Nangaoian | China (Hubai) | L. sp. (219687) | |
| Dyeran | USA (Vermont) | L. sp. (191) L. zitteli (121235) | |
| Dyeran | USA (Pennsylvania) | L. minor (192 226194) | |
| Delamaran | Canada (British Columbia) | L. lineatus (84424 84425 84426 84427 84428 121953 121954 121959 121963 121966) L. lineatus, L. undulatus (121962) | |
| Middle Cambrian | Canada (British Columbia) | L. sp. (171308) | |
| Middle Cambrian | Canada (Brithish Columbia) | L. sp. (188661 188662) | |
| St Davids | Canada (British Columbia) | L. lineatus (122072 122094) | |
| St Davids | Spain (Zaragoza) | L. conicus (90546) | |
| St Davids | Spain | L. lineatus (55501) | |
| Marjumian | USA (Utah) | L. sp. (260) |