Ellesmerella rara, Vachard, Krainer & Lucas, 2015

Vachard, D, Krainer, K & Lucas, SG, 2015, Late Early Permian (late Leonardian; Kungurian) algae, microproblematica, and smaller foraminifers from the Yeso Group and San Andres Formation (New Mexico; USA), Palaeontologia Electronica (English ed.) 3 (8), pp. 1-77 : 28

Ellesmerella rara n. sp.

Figure 10.1-10.3

zoobank.org/ 08ED08A8-233B-451D-9B66-6339DF25B309

v. 2013 b Ellesmerella sp. 1 ; Vachard, Krainer and Lucas, p. 348 (no illustration).

Etymology. Latin rarus, rare.

Holotype. NMMNH P-67501; Figure 10.1-2 ; sample MG 13 c-d.

Paratypes. NMMNH P-67502; Figure 10.3 .

Material. 3 specimens (samples MG 13 c-d, i) .

Locus Typicus. NMMNH locality 8891; Yeso Group, Los Vallos Formation, Torres Member, Massacre Gap in the southern Fra Cristobal Mountains (New Mexico).

Stratum Typicum. Early? Kungurian (late Leonardian).

Diagnosis. An Ellesmerella constituting some small ovoid sets of attached trichomes without encrustation of an exotic nucleus.

Description. The whole colony is elongate to ovoid (L = 0.47-0.50 mm; w = 0.10-0.65 mm); it is composed of 4-5 whorls of roughly concentric rows of very low, undivided pseudochambers measuring D = 0.04-0.05 mm; d = 0.03 mm; l = 0.16-0.33 mm; and s = 0.01-0.02 mm.

Remarks. Ellesmerella permica is distinct in constituting large oncoids around elongate nuclei (e.g., bivalve or brachiopod shell fragments or Anchicodium phylloid algae), which are common from the Carnic Alps (Austria-Italy) to Alborz ( Iran); moreover, its pseudochambers are shorter and smaller (l = 0.30-0.40 mm (rarely 0.11 mm) and d = 0.01-0.02 mm according to Flügel, 1966).

Occurrence. Early? Kungurian (late early Leonardian) of New Mexico (Yeso Group, Torres Member).

Figures

FIGURE 10. 1-3. Ellesmerella rara n. sp. 1. NMMNH P-67501, holotype and microfacies. Yeso Group. Sample MG 13c. 2. NMMNH P-67501, detail of holotype. Yeso Group. Sample MG 13d. 3. NMMNH P-67502, paratype encrusting the concavity of a bivalve shell. Yeso Group. Sample MG 13i. 4-6. Boueina? tubulata n. sp. 4. NMMNH P-67504, paratype. Oblique section with two medullar siphons (left) and numerous cortical siphons. San Andres Fm. Sample MLY(2) 5-17. 5. NMMNH P-67503, holotype. Axial section. San Andres Fm. Sample MLY(2) 6-12. 6. NMMNH P- 67505, paratype. Axial section. San Andres Fm. Sample MLY(2) 6-19b. 7-8. Undetermined Chlorophyta. 7. NMMNH P-67514, subaxial section with possible connections between two orders of siphons or of laterals L1 and L2 (top, right). Yeso Group. Sample MG(2) 12-1. 8. Oblique section with distal parts of siphons or laterals. San Andres Fm. Sample MLY(2) 6-9. 9-10. Gymnocodium? johnsonii n. sp. 9. NMMNH P-67509, holotype. Longitudinal section. Yeso Group. Sample MG(2) 12-4. 10. NMMNH P-67510, paratype. Compressed longitudinal section. Yeso Group. Sample MG(2) 12-12. 11. Gymnocodium? bacillum n. sp. NMMNH P-67513, holotype. Longitudinal section. San Andres Fm. Sample SAR 8a-4.