Pitarinae (Keen, 1951)

Liu, Yumeng, Ma, Peizhen, Zhang, Zhen, Li, Cui, Chen, Ya, Wang, Yunan & Wang, Haiyan, 2022, The new phylogenetic relationships in Veneridae (Bivalvia: Venerida), Zoological Journal of the Linnean Society 196, pp. 346-365 : 360

Pitarinae

Pelecyora Dall, 1902 has always been placed in Dosiniinae ( Jukes-Browne, 1908; Fischer-Piette & Delmas, 1967; Zhuang, 2001; Huber, 2010), but Xu et al. (2008) included it in Pitarinae . We examined the shells and found three conchological distinctions between Pelecyora [represented by Pelecyora trigona (Reeve, 1850) ], Pitarinae [represented by Pitar striatum (Gray, 1838) ] and Dosiniinae [represented by Dosinia biscocta (Reeve, 1850) ]: the type of the anterior lateral tooth in the LV, the height of the umbo and inflation of the lunule ( Fig. 10 ). Both Pelecyora trigona and Pitar striatum have an anterior lateral tooth that is not aligned with the anterior cardinal tooth ( Fig. 10E, F ), in addition to a higher umbo ( Fig. 10E, F ) and a lunule that is flush with the main body of the shell ( Fig. 10H, I ). In Dosinia biscocta , the anterior lateral tooth is aligned with the anterior cardinal tooth ( Fig. 10D ), while the umbo is lower ( Fig. 10D ) and the lunule is impressed below the level of the main body of the shell ( Fig. 10G ). Nevertheless, the phylogenetic results based on multigene fragments show that Pelecyora is basal in clade B1, Pitarinae is in clade B1 and Dosiniinae is clustered in clade A ( Fig. 3 ). Consequently, we suggest placing Pelecyora in Pitarinae .

Figures

Figure 3. Phylogram inferred from Bayesian analysis of multigene fragments (for data partitions and substitution models used, see Table 2). Numbers near the nodes are branch support values (Bayesian posterior probabilities followed by maximum likelihood bootstrap support values).

Figure 10. Shell of Dosinia biscocta (A, D, G), Pelecyora trigona (B, E, H) and Pitar striatum (C, F, I). A–C, internal view of left valve. D–F, umbo. G–I, lunule. Small arrows indicate the umbo height; large arrows indicate the anterior lateral teeth.