Abertella miskellyi Kroh et al., 2013
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publication ID |
https://doi.org/ 10.11646/zootaxa.4369.3.1 |
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publication LSID |
lsid:zoobank.org:pub:97CAA2FC-F3CC-407B-8768-2BB9DE037C86 |
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DOI |
https://doi.org/10.5281/zenodo.5961804 |
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persistent identifier |
https://treatment.plazi.org/id/0392BB4B-FFA3-F557-7D92-FE39FDB5FBCD |
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treatment provided by |
Plazi |
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scientific name |
Abertella miskellyi Kroh et al., 2013 |
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Abertella miskellyi Kroh et al., 2013
2013 Abertella miskellyi Kroh et al. : 371–376, figs. 2–6.
Diagnosis. Abertella with strongly heterogeneous interambulacral basicoronal plates (small in interambulacrum 5, largest in interambulacra 2 and 3); oral interambulacra discontinuous by involvement of two adjacent ambulacral plates (rather than one as in other Abertella ) in at least one of the oral interambulacra; apparent "violation" of Lovén's Rule in oral ambulacrum III.
Type material studied. Holotype MB E.7463, paratype MB E.7462.
Description. See Kroh et al. (2013).
Occurrence. A. miskellyi is recorded only from the (possibly early) Miocene of Chubut Province, southern Argentina in the Camarones Formation ( Fig. 1 View FIGURE 1 ).
Remarks. This species is unique among Abertella in that the posterior interambulacral basicoronal plate is much smaller than that in each of the paired interambulacral basicoronals. It is also the only Abertella in which specimens are known to have a discontinuity involving more than one postbasicoronal plate in a given halfambulacrum. An unusual feature of one of the known specimens of A. miskellyi is that ambulacral basicoronal III at first seemed longer in the "a" column than in the "b" column, suggesting violation of Lovén's Rule (sensu David et al. 1996) until a small plate was detected, wedged between the basicoronal plates of ambulacrum III to re-establish the Lovénian pattern ( Kroh et al. 2013).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.