Damonella medialtis, Filho & Ceolin & Fauth & Lima, 2023

Filho, Marcos Antonio Batista Dos Santos, Ceolin, Daiane, Fauth, Gerson & Lima, Francisco Henrique De Oliveira, 2023, Ostracods from the Barbalha and Crato formations, Aptian of the Araripe Basin, northeast Brazil, Zootaxa 5319 (3), pp. 332-350 : 340

Damonella medialtis sp. nov.

Fig. 4.4A–C

Etymology: From the Latin “ medius ”, meaning “middle”, and “ altitudo ”, meaning “height”, referring to its greatest height being close to the middle point of the carapace.

Material: 56 specimens.

Figured specimen: ULVG-14195.

Dimensions:

Diagnosis: A Damonella species with greater height closer to the middle. LV overlaps RV along the entire margin, being especially pronounced posterodorsally, and the RV shows a slight concavity both, in the postero-dorsal and antero-dorsal margins.

Description: Medium carapace with a sub-rectangular to sub-ovoid outline in lateral view and an ovoid outline in dorsal view. Anterior and posterior margins rounded and equicurvate. Ventral margin slightly concave, dorsal margin convex. Greatest height at the mid-length or slightly posterior of the mid-length, greatest length at mid-height, greatest width slightly posterior to the mid-length.

LV larger than RV, visibly overlapping along the entire carapace margin, being particularly prominent posterodorsally. RV shows slight concavities in the postero-dorsal and antero-dorsal margins. Dorsal margin of LV more uniformly convex than that of RV.

Carapace surface smooth. Sexual dimorphism not observed. Internal characteristics not visible, as only tightly closed carapaces were recovered.

Remarks: This species resembles Damonella grandiensis Tomé et al., 2014 , differing mainly in the slight concavities in the antero and posterodorsal margins of its RV and, in dorsal view, in its more compressed anterior region.

Occurrences: PS-06-CE: AM-14 (103.6 m), AM-17 (99.8 m), AM-18 (99.3 m), AM-32 (72.59 m), AM-62 (91.5 m).

Stratigraphic and geographic distribution: Lower Aptian, Barbalha and Crato formations, Araripe Basin, Brazil (this study).

Figures

FIGURE 4. Plate illustrating the ostracod species recovered from the Barbalha and Crato formations, Araripe Basin. 1. Candonopsis? alagoensis Tomé, Lima Filho & Neumann, 2014. ULVG-13482, instar A-2. A—RLV, B—DV. 2. Cypridea araripensis Silva, 1978?.ULVG-13489,mold.3. BrasacyprissubovatumDo Carmo,Coimbra,Whatley,Antonietto&Citon,2013. ULVG-13490, instar A2. A—RLV, B—DV. 4. Damonella medialtis sp. nov. ULVG-14195, adult. A—RLV, B—DV, C—LLV. 5. Pattersoncypris cf. angulata (Kr̂mmelbein & Weber, 1971). ULVG-13483, instar A-2. A—RLV, B—DV. 6. Pattersoncypris micropapillosa Bate, 1972. ULVG-13486, instar A-2. A—RLV, B—DV. 8. Pattersoncypris salitrensis (Kr̂mmelbein & Weber, 1971). ULVG-13484, instar A-3. A—RLV, B—DV.