Olenellus ...
Olenellus sp. aff. getzi Dunbar, 1925 Fig. 2.1, 2.2 ? Olenellus sp. 1 Fritz, 1991, p. 16, pl. 2, figs. 7, 8. Material examined. KUMIP 355557 and PWNHC-2013.23.2. Discussion. These specimens most closely resemble O. getzi. Key diagnostic features that they share include: broadly convex anterior cepha...
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| Format: | Text |
| Language: | unknown |
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Zenodo
2014
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| Online Access: | https://dx.doi.org/10.5281/zenodo.6136066 https://zenodo.org/doi/10.5281/zenodo.6136066 |
| Summary: | Olenellus sp. aff. getzi Dunbar, 1925 Fig. 2.1, 2.2 ? Olenellus sp. 1 Fritz, 1991, p. 16, pl. 2, figs. 7, 8. Material examined. KUMIP 355557 and PWNHC-2013.23.2. Discussion. These specimens most closely resemble O. getzi. Key diagnostic features that they share include: broadly convex anterior cephalic border; the absence of a preglabellar field; S2 and S1 are not conjoined adaxially; and the ocular lobe has a prominent furrow that is present across the entire margin. Fritz (1991) and Whittington (1989) both noted strong similarities between O. getzi and O. thompsoni (Hall 1859), and this close relationship was further supported by phylogenetic evidence (Lieberman 1999). The specimens presented here can be distinguished from O. thompsoni based on characters identified by Lieberman (1999) that include: lateral margins of LA directly anterior of lateral margins of LO; the lateral margins of L2 do not bulge laterally relative to L1; the posterior margins of the ocular lobes extend back to the abaxial tips of ... : Published as part of Gapp, I. Wesley & Lieberman, Bruce S., 2014, New olenelloid trilobites from the Northwest Territories, Canada, pp. 479-498 in Zootaxa 3866 (4) on pages 482-483, DOI: 10.11646/zootaxa.3866.4.2, http://zenodo.org/record/249698 ... |
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