Abertella miskellyi (Mooi, Rich, Martínez, Sergio A., Del Río, Claudia J. & Ramos, Maria Inês Feijó 2018)
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- Abertella miskellyi Mooi, Rich, 2018, Zootaxa 4369: 318-318.
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.
Description. See Kroh et al. (2013). Argentina Chubut Province
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).
- Mooi, Rich; Martínez, Sergio A.; Del Río, Claudia J.; Ramos, Maria Inês Feijó; 2018: Late Oligocene - Miocene non-lunulate sand dollars of South America: Revision of abertellid taxa and descriptions of two new families, two new genera, and a new species, Zootaxa 4369: 318-318. doi