Macunhaella, Almeida-Lima & Guzmán & Maia & Jesus & Piovesan, 2024

Almeida-Lima, Débora Soares De, Guzmán, Juliana, Maia, Renata Juliana Arruda, Jesus, Ariany De & Piovesan, Enelise Katia, 2024, New Non-Marine Ostracod Genera And Species Of Aptian Age From Araripe Basin, Northeast Brazil, Zootaxa 5496 (3), pp. 401-416 : 408

Macunhaella gen. nov. ( Fig. 4G–J )

Zoobank-link: urn:lsid:zoobank.org:act:B6F27B50-999E-4CC1-A398-CA445EB326FE

Derivation of name: In memory of Maria da Conceição Cunha for her contribution to the knowledge of non-marine ostracods of Brazil.

Type-species: Macunhaella posteroaltis sp. nov.

Stratigraphic and geographic distribution: Aptian, Crato Formation, Santana Group, Araripe Basin, Crato Municipality, Ceará State, Brazil ( Guzmán et al. 2022, 2023; this study).

Diagnosis: A new genus of Cyprididae with a sub-rectangular carapace, greater height in the posterior region and obtuse cardinal angles.

Description: Carapace sub-rectangular in lateral view; fusiform in dorsal view. Ventral margin straight; dorsal margin straight and slightly sloping towards the anterior region. Posterior region higher than anterior. Anterior and posterior cardinal angles obtuse.

Remarks: The new genus Macunhaella has a higher posterior region, which makes it different from other representatives of the Cyprididae family, and this is its most evident distinctive feature. This is a typical characteristic of representatives of the Darwinuloidea superfamily, however, the individuals of Macunhaella gen. nov. have carapaces with a fusiform outline in dorsal view, greater median width and are narrower than any genera within Darwinuloidea, in addition to presenting a different pattern of adductor muscle scar than that described for this superfamily ( Fig. 4J ). The genus Paracypridea Swain, 1946 , also has the same features as the new genus Macunhaella but differs significantly from it by displaying a rostrum in the anteroventral region of the carapace.

Figures

FIGURE 4. New taxa of Ostracoda. A–C (right view, left view and dorsal): Batecypris reticularis sp. nov. noded; D–F (left view, right view and dorsal): Batecypris reticularis sp. nov. unnoded; G–J (left view, right view, dorsal and detail of the muscle scars): Macunhaella posteroaltis sp. nov.; K–M (RV, left view and dorsal): Timiriasevia aratra sp. nov.; N–P (left view, right view and dorsal): Theriosynoecum favus sp. nov.; Q–S (right view, left view and dorsal): Wolburgiopsis magnafossa sp. nov. Scale bar: 100 μm.