Gigantidas coseli Saether, Little, Campbell, Marshall, Collins & Alfaro, 2010

Saether, Kristian P., Jingeng, Sha, Little, Crispin T. S. & Campbell, Kathleen A., 2016, New records and a new species of bivalve (Mollusca: Bivalvia) from Miocene hydrocarbon seep deposits, North Island, New Zealand, Zootaxa 4154 (1), pp. 1-26 : 7

Gigantidas coseli Saether, Little, Campbell, Marshall, Collins & Alfaro, 2010

( Fig. 4 )

Gigantidas coseli Saether et al., 2010: 21 ; figs. 4B, C, 8–10, 17.

Material. One specimen from Moonlight North (Y16/f0694), L4203 (holotype; Fig. 4 ), UOA.

Remarks. Saether et al. (2010) originally described G. c o s e l i with unknown details of the anterior adductor scar. Further study of the holotype reveals that the anterior adductor scar is situated in the extreme anterior part of the shell, has a moderately strongly impressed anterior margin that closely follows the anterior margin of the shell, probably has a weaker posterior margin (seen weakly in one specimen, Fig. 4 ), and is rather narrow. These anterior adductor scar features are typical for the genus.

Figures

FIGURE 4. Gigantidas coseli Saether, Little, Campbell, Marshall, Collins & Alfaro, 2010, specimen L 4203 (holotype), from Moonlight North, showing new details of the anterior adductor scar. A. Original photograph of anterior half of left valve. B. Anterior adductor scar highlighted.