Macroscapha subhemispherica, Brandão, 2010

Brandão, Simone N., 2010, Macrocyprididae (Ostracoda) from the Southern Ocean: taxonomic revision, macroecological patterns, and biogeographical implications, Zoological Journal of the Linnean Society 159 (3), pp. 567-672 : 668-669

publication ID	https://doi.org/10.1111/j.1096-3642.2009.00624.x
persistent identifier	https://treatment.plazi.org/id/843D87F9-FF89-EB4D-38E5-FB6538B6FC67
treatment provided by	Valdenar
scientific name	Macroscapha subhemispherica
status	sp. nov.

Treatment

MACROSCAPHA SUBHEMISPHERICA View in CoL SP. NOV.

( FIGS 59 View Figure 59 , 62J–L View Figure 62 , 63J–L View Figure 63 )

1991 Macroscapha cf. tensa, Hartmann, 1991: 216 . 1991 Macroscapha cf. turbida, Hartmann, 1991:

216.

Etymology: For its subhemispherical valves.

Material: 41 valves (vials with soft parts of respective specimens were lost).

Holotype: 1 RV, 1 LV were contained on a micropalaeontological slide, labelled ‘ K- 34832 a. Macroscapha cf. tensa , 1♀, Antarktis-Stat. II/493 , Koll. Rauschert, det. Hartmann /90’. These specimens were studied by Hartmann (1991). Upper littoral of King Georg Island ; ZMH K-34832 a.

Paratypes: 2 RV, 2 LV were contained on a micropalaeontological slide, labelled ‘ K- 34829 a. Macroscapha cf. tensa , 1♂, 1 L., Antarktis-Stat . II/174 , Koll. Rauschert, det. Hartmann /90’. These specimens were studied by Hartmann (1991). Upper littoral of King Georg Island ; ZMH K-34829 a.

3 RV, 6 LV (plus broken off valves) were contained on a micropalaeontological slide, labelled ‘ K- 34830 a. Macroscapha cf. tensa , 5♀, 1 L., Antarktis Stat . II/444 , Koll. Rauschert, det. Hartmann /90’. These specimens were studied by Hartmann (1991). Upper littoral of King Georg Island ; ZMH K-34830 a. These specimens are illustrated in Figures 62J View Figure 62 and 63J View Figure 63 .

1 View Figure 1 RV (plus broken valves) were contained on a micropalaeontological slide, labelled ‘ K- 34833 a. Macroscapha cf. tensa , 3♀, Antarktis-Stat . II/473 , Koll. Rauschert, det. Hartmann /90’. These specimens were studied by Hartmann (1991). Upper littoral of King Georg Island ; ZMH K-34833 a.

1 LV (plus broken off valves) were contained on a micropalaeontological slide, labelled ‘ K- 34834 a. Macroscapha cf. tensa , 3♀, Antarktis-Stat. II/81 , Koll. Rauschert, det. Hartmann /90’. These specimens were studied by Hartmann (1991). Upper littoral of King Georg Island; ZMH K-34834 a.

2 RV, 2 LV (plus broken off valves) were contained on a micropalaeontological slide, labelled ‘ K- 34835 a. Macroscapha sp. cf. turbida , ♂, ♀, Antarktis-Stat . II/487 , Koll. Rauschert, det. Hartmann /90’. These specimens were studied by Hartmann (1991). Upper littoral of King Georg Island ; ZMH K-34835 a. These specimens are illustrated in Figures 62K–L View Figure 62 and 63K–L View Figure 63 .

4 View Figure 4 RV, 4 LV (plus broken off valves) were contained on a micropalaeontological slide, labelled ‘ K- 34836 a. Macroscapha sp. cf. turbida , 1 ♂, 7♀, subad., Antarktis-Stat . II / 515 p. 30, Koll. Rauschert, det. Hartmann /90’. These specimens were studied by Hartmann (1991). Upper littoral of King Georg Island ; ZMH K-34836 a.

4 RV, 6 LV (plus broken off valves) were contained on a micropalaeontological slide, labelled ‘ K- 34842 a. Macroscapha cf. tensa , 3♀, 2 subad., Antarktis-Stat . II / 482 p. 29, Koll. Rauschert, det. Hartmann /90’. These specimens were studied by Hartmann (1991). Upper littoral of King Georg Island ; ZMH K-34842 .

2 RV (plus broken off valves) were contained on a micropalaeontological slide, labelled ‘K- 34844a. Macroscapha cf. tensa, Antarktis-Stat. II /193, Koll. Rauschert, det.Hartmann/90’. These specimens were studied by Hartmann (1991). Upper littoral of King Georg Island; ZMH K-34845.

Distribution ( Fig. 59 View Figure 59 ): Recent. King Georg Island, Scotia Sea , upper littoral.

Valve measurements ( Fig. 59 View Figure 59 ): Holotype, A RV L 1.58 mm, H 0.66 mm; LV L 1.56 mm, H 0.63 mm. Paratypes, A RV L 1.52–1.59 mm, H 0.65–0.70 mm; A LV L 1.48–1.57 mm, H 0.61–65 mm; (A-1) RV L 1.31– 1.38 mm, H 0.55–57 mm; (A-1) LV L 1.22–1.34 mm, H 0.51–57 mm.

Diagnosis: Valves small (for the genus) and subhemispherical in lateral view; dorsal margin highly and continuously arched; ventral margin fairly straight; anterior and posterior margins smoothly rounded; posterior and dorsal margins reaching each other at angle of 90° in RV and 70° in LV. In some specimens RV larger than LV, in others LV larger than RV. Zone of concrescence narrow, with straight radial pore canals; except anteroventrally where it is wider with some ramified radial pore canals.

Remarks: Macroscapha subhemispherica sp. nov., which occurs in the upper littoral, is clearly smaller and less sinuous in outline than Mh. turbida , Mh. scotia , and Mh. rehmi ( Figs 37D–G View Figure 37 , 38D–G View Figure 38 , 62 View Figure 62 , 63 View Figure 63 ). The latter three species inhabit greater depths ( 68– 385 m). Most of the described species of Macroscapha (i.e. Mh. cactus sp. nov., Mh. falcis sp. nov., Mh. gyreae , Mh. inaequalis , Mh. inaequata , Mh. marchilensis , Mh. opaca , Mh. solecavai sp. nov., Mh. walterae sp. nov.) are more elongate, less high in relation to length than Mh. subhemispherica . Additionally, Macroscapha atlantica , Macroscapha heroica , Mh. jiangi , and Mh. sinuata present more sinuous outlines than Mh. subhemispherica .