Acar Gray, 1857

Simone, Luiz Ricardo L., 2024, New species, misidentifications and problematic taxonomy of some Atlantic South American marine mollusks: a review, Papéis Avulsos de Zoologia 64, pp. 1-104 : 66-67

Genus Acar Gray, 1857

Acar domingensis ( Lamarck, 1819) revalidated un- der the concept and review by Simone & Chichvarkhin (2004: 363-365, figs. 15-25, 60-65). ( Fig. 44B )

Synonymy see Lamy (1907: 80-82) and Simone &

Chichvarkhin (2004: 363).

Remarks: This item reunites the taxonomic discussion both, of B. cancellaria and of A. domingensis . Both Lamarck′s (1819) species were relatively forgotten along the 19 th century ( Lamy, 1907). Both species were not mentioned neither in the magistral survey by Reeve (1844). Both are, however, present in another important survey (Martini-Cheminitz) – Kobelt (1891), which can be considered the first reviser. In that paper, both species are illustrated by the first time. Both illustrations are reproduced here, Fig. 44A is of the Arca cancellaria Lamarck representative ( Kobelt,1891:72,sp.52,pl. 20,fig. 5),while Fig. 44B represents Arca domingensis Lamarck ( Kobelt, 1891: 195, sp. 178, pl. 47 fig. 5). Both illustrations and descriptions by Kobelt (1891) – the first reviser,clearly show what were considered as those species along the time up to Huber (2015). Besides, other studies deepened the concept of both species, including anatomical features (e.g., Simone & Chichvarkhin, 2004).

Thus, based on the ICZN article 24.2.1 – the principle of the "First Reviser". The previous taxonomic concept of both, Barbatica cancellaria and Acar domingensis are revalidated, resolving an important gap of the Western Atlantic arcid taxonomy.One of the B.cancellaria syntype is illustrated here ( Fig. 44C ), showing the exact characteristics of what is known for the species. This resolution is also adopted in a recent paper ( Passos et al., 2024: 23).

Figures

Figure 44.Shells of Barbatia cancellaria and Acar domingensis: (A) B.cancellata, illustration by Kobelt (1891,pl. 20,fig.5); (B) A.domingensis,illustration by Kobelt (1891,pl. 47,fig.5); (C) B.cancellaria, syntype MNHN-IM-2000-24605 (L 21.4 mm) (courtesy MNHN).