Deihim mansureae Ginter, Hairapetian and Klug, 2002

Roelofs, Brett, Barham, Milo, Mory, Arthur J. & Trinajstic, Kate, 2016, Late Devonian and Early Carboniferous chondrichthyans from the Fairfield Group, Canning Basin, Western Australia, Palaeontologia Electronica (Barking, Essex: 1987) 262, pp. 1-28 : 16-17

Deihim mansureae Ginter, Hairapetian and Klug, 2002

Figure 6.5 -12

v. 2000? Protacrodus sp. ; Long and Hairapetian, pp. 217-218, fig. 4O.

v. 2000 Protacrodus sp. cf. “ P. aequalis“ sensu Ginter and Turner ; Yazdi and Turner, p. 226, figs. 3.4-7, 4.4.

v. 2002 Deihim mansureae gen. et sp. nov.; Ginter, Hairapetian and Klug, pp. 191-193, text-fig. 10; pl. 1, fig. r; pl. 2, fig. k; pl. 4, figs. fg, j-m; pl. 5, figs a-m.

v. 2005 Polyacrodontidae incertae sedis; Derycke-Khatir, p. 76, pl. VII, figs. 7-10.

v. 2005 Bobbodus sp. ; Derycke-Khatir, pp. 95-96, pl. XII, figs. 1-2.

v. 2009 Deihim mansureae Ginter, Hairapetian and Klug ; Hairapetian and Ginter, pp. 176- 179, figs. 2D, 4H.

v. 2010 Deihim mansureae Ginter, Hairapetian and Klug ; Hairapetian and Ginter, p. 362, fig. 3A.

v. 2010 Deihim mansureae Ginter, Hairapetian and Klug ; Ginter, Hampe and Duffin, p. 88, fig. 81A-J.

v. 2011 Deihim mansureae Ginter, Hairapetian and Klug ; Ginter, Hairapetian and Grigoryan, pp. 166-169, figs. 8A-E, 11C.

v. 2011 Deihim mansureae Ginter, Hairapetian and Klug ; Ivanov and Lucas, p. 60, fig. 8.

v. 2013 Deihim mansureae Ginter, Hairapetian and Klug ; Habibi, Yazdi, Zarepoor and Shirazi, p. 30, fig. 4.

v. 2015 Deihim mansureae Ginter, Hairapetian and Klug ; Roelofs, Playton, Barham and Trinajstic, p. 88, text-fig. 6.

Material. One tooth from sample OH-4, Gumhole

Formation, Oscar Hill, Famennian; 12 teeth from sample 198404, two teeth from samples 198480,

six teeth from sample TS-1, Laurel Formation, Laurel Downs, Tournaisian.

Description. Two different tooth morphotypes can be distinguished. The first tooth type is pentacuspid, comprising a large medial cusp approximately twice as high as the two pairs of highly fused lateral cusps ( Figure 6.5-6 ). The crown is ornamented on both faces with coarse cristae. Four to nine cusplets are present on the labial side ( Figure 6.10 -

12). A shallow groove marks the crown-base interface on the lingual face of the tooth. The base extends lingually, furthest at the centre of the lingual margin ( Figure 6.6 ). A few large canals perforate the occlusal-lingual face of the base from the lingual margin to the crown base. A row of small pores are present along the labial face of the base, immediately below the crown ( Figure 6.10 -11).

The second tooth type is smaller, possessing a large triangular central cusp with one to two pairs of smaller, laterally diverging cusps ( Figure 6.7 -9). Cristae are most prominent on the lingual face of the crown. The labial face of the crown typically bears four cusplets with one tooth ( WAM 15.6 .19, Figure 6.9 ) possessing a single pair of prominent ovoid labial cusplets. A row of small pores within a shallow trough, mark the crown-base interface on the labial face. The crown-base interface forms a low arch. The base is semi-circular in outline extending distally and lingually beyond the crown base ( Figure 6.7-8 ) .

Remarks. The teeth bear the diagnostic characters of D. mansureae , including the large central cusp, diverging lateral cusps and a row of cusplets along the labial face of the crown. However, these teeth differ from the original morphotypes outlined by Ginter et al. (2002) in regards to cusp number and the variation in size between the central and lateral cusps. The first tooth type recovered from the Canning Basin consists of crowns resembling those of Morphotype 1 (sensu Ginter et al., 2002); however, the mesio-distally extended base and low profile of the central cusp is more similar to Morphotoype 2. Examples of Morphotype 3 are lacking from the teeth collected here. The few Morphotype 4 teeth that were recovered ( Figure 6.7-8 ) comprise a central cusp that is significantly lower in profile than other examples of this morphotype figured in Ginter et al. (2002, plate 5D-F). The teeth from the Canning Basin do not fully conform to any of the morphotypes originally described ( Ginter et al., 2002) and suggests these teeth may belong to a different species than the older Famennian forms found in Iran.

Figures

FIGURE 6. Protacrodont teeth from Lower Carboniferous Laurel Formation, Laurel Downs, Lennard Shelf, Canning Basin, Western Australia. 1, Protacrodus aequalis, WAM 15.6.43, sample TS-1, in lingual view (1); 2-4, Protacrodus sp. 1, WAM 15.6.45, sample TS-1, in lingual (2), occlusal (3) and labial (4) views; 5-12, Deihim mansureae, WAM 15.6.17, in lingual view (5), WAM 15.6.18, sample 198408, in occlusal view (6), WAM 15.6.46, sample TS-1, in lingual view (7), WAM 15.6.48, sample TS-1, in lingual view (8), WAM 15.6.19, sample 198404, in labio-basal view (9), WAM 15.6.17, sample 198404, in labial view (10), WAM 15.6.49, sample TS-1, in labio-basal view (11), and WAM 15.6.18, sample 198404, in lateral view (12); 13-16, Dalmehodus cf. turnerae, WAM 15.6.30, sample LG-1, in lingual (13) and labial (14) views, WAM 15.6.44, sample TS-1, in occlusal (15) and lateral (16) views. Scale bar length: 1-4, 0.5 mm; 5- 12, 1 mm; 13-16, 0.25 mm.