Brasilocypria ricardopintoi, Almeida, Nadiny Martins De, Ferreira, Vitor Góis, Martens, Koen & Higuti, Janet, 2023

Almeida, Nadiny Martins De, Ferreira, Vitor Góis, Martens, Koen & Higuti, Janet, 2023, 5237, Zootaxa 5237, pp. 1-88 : 32-33

publication ID	https://doi.org/ 10.11646/ZOOTAXA.5237.1.1
publication LSID	lsid:zoobank.org:pub:3A5A9DF9-763E-4561-AC62-7E0D2F0B54B4
DOI	https://doi.org/10.5281/zenodo.7640378
persistent identifier	https://treatment.plazi.org/id/0396C218-4F6A-FF97-94AB-0BA5A520F835
treatment provided by	Plazi
scientific name	Brasilocypria ricardopintoi
status	gen. et spec. nov.

Treatment

Brasilocypria ricardopintoi View in CoL gen. et spec. nov.

( Figs 16–19 View FIGURE 16 View FIGURE 17 View FIGURE 18 View FIGURE 19 )

2007? Physocypria schubarti Higuti et al. View in CoL : 1935, table 2.

2009 Physocypria schubarti Higuti et al. View in CoL : 664, table 1.

2010 Physocypria schubarti Higuti et al. View in CoL : 267, 269, tables 2, 4.

2015a? Physocypria schubarti Matsuda et al. View in CoL : 326, table 1.

2015b? Physocypria schubarti Matsuda et al. View in CoL : 118, table 1.

2017b? Physocypria schubarti Higuti et al. View in CoL : 5, appendix 1.

2017? Physocypria schubarti Conceiç View in CoL „o et al.: 5, table 2.

2020? Physocypria schubarti Conceiç View in CoL „o et al.: 1670, 1677, fig. 4, table 2.

2020? Physocypria schubarti Higuti et al. View in CoL : 2, table S1.

2020? Physocypria schubarti Rosa et al. View in CoL : 29, table 1.

2021? Physocypria schubarti Campos et al. View in CoL : 7, table 1.

2021? Physocypria schubarti Rosa et al. View in CoL : 229, 230, 234, 235, figs. 2,6, tables 1,3.

Diagnosis. Cp with suboval shape, LV overlapping RV, except in the middle of dorsal margin, anterior overlap the largest. Posterior marginal tubercles more prominent than anterior ones. CpV and CpD narrow.A2 with natatory setae well-developed, accompanying seta absent; male A2 with four-segmented endopodite, setae t2 and t3 transformed into sexual bristles. Rpp and Lpp asymmetrical. Rpp with sharply pointed distal corner of first segment; second segment with strongly curved dorsal margin. Lpp shorter and narrower, distal segment sickle-shaped, smoothly curved. T1 with one long and hirsute seta next to the two a-setae. T2 without d1 and d2 setae. T3 without d2-seta. CR with a long proximal seta. Hp with ls and ms elongated and subequal in length.

Differential diagnosis. Brasilocypria ricardopintoi gen. et spec. nov. can be distinguished from other Physocypria s.l. species by the morphology of the prehensile palps and Hp. Thus far, no other species of Physocypria s.l. has been recorded with similar morphological characteristics of the male reproductive organs. However, regarding the shape of the carapace, especially by the presence of a large overlap of the LV over the RV, especially anteriorly, B. ricardopintoi gen. et spec. nov. is similar to Keysercypria affinis , Physocypria biwaensis Okubo, 1990 , P. bullata , K. deformis and Physocypria longiseta Klie, 1930 . However, the new species differs from all of these species in the shape of the dorsal margin of the LV, which is rounded and with the greatest height situated at the middle of the valve in K. affinis and P. longiseta , near to the anterior region in K. deformis and is also more straight in B. ricardopintoi gen. et spec. nov., with the greatest height situated closer to the posterior region. Physocypria biwaensis has an arched dorsal margin of the LV, while P. bullata has a very large dorsal expansion on the RV and both of these characters are absent in B. ricardopintoi gen. et spec. nov.

Brasilocypria ricardopintoi gen. et spec. nov. has a compressed shape in lateral view, which is also observed in B. lordi gen. et spec. nov., but the first species has a large overlap along the antero and posteroventral margins, while the second species has a smaller overlap there.

Material examined. Type locality: Alluvial valley of the upper Paraná River floodplain, Banhado Lake ( PAR 255 ), in floating macrophytes. Coordinates : 22°33′58.6′′ S, 53°23′10.4′′ W GoogleMaps .

Type material: Holotype: A male, with soft parts dissected in glycerine in a sealed slide and with valves stored dry in a micropaleontological slide ( MZUSP 43111 ).

Allotype: A female, dissected and stored as the holotype ( MZUSP 43112 ).

Paratypes: Two males dissected and stored as the holotype ( MZUSP 43113 , MZUSP 43114 ) . Three male carapaces stored dry in micropaleontological slides ( MZUSP 43115 , MZUSP 43116 , MZUSP 43117 ) .

Two females dissected and stored as the holotype ( MZUSP 43118 , MZUSP 43119 ). Three female carapaces stored dry in micropaleontological slides ( MZUSP 43120 , MZUSP 43121 , MZUSP 43122 ) .

Etymology: The present species is named in honour of Prof. Ricardo Lourenço Pinto (Brasília, Brazil) in recognition of his important contribution to the knowledge of Brazilian terrestrial and freshwater ostracods, and in acknowledgement of years of friendship with JH and KM.

Measurements of illustrated specimens. See Table 2 View TABLE 2 .

Description of male. Valves with suboval shape, with greatest height in front of the middle of the valves. LVi ( Figs 16A, C–D View FIGURE 16 ) with narrow calcified anterior and posterior inner lamella; an inwardly displaced inner list running along the anterior margin, ending in an internal anteroventral tooth, tubercle-sockets displaced along anteroventral and posteroventral margins.

RVi ( Figs 16B, E–F View FIGURE 16 ) with narrow calcified anterior inner lamella and an inwardly displaced inner list along the anterior margin, disappearing in ventral margin; strong marginal tubercles along the anteroventral and posteroventral margins, weakly along middle of ventral margin.

CpRl ( Fig 16G View FIGURE 16 ) with a suboval shape, with greatest height in front of middle; LV overlapping RV along all margins, except in middle of dorsal side, with the greatest overlap in anterior side. CpD ( Fig 16H View FIGURE 16 ) and CpV ( Fig 16I View FIGURE 16 ) with compressed shape, with greatest width slightly behind middle, external surface with shallow pits and setae ( Fig 16J View FIGURE 16 ).

Only the differences with the male of Brasilocypria pea gen. et spec. nov. are described here.

A1 (not illustrated) third segment with two apical setae: ventrally with one short seta almost reaching middle of fourth segment and dorsally with one long seta reaching the tip of fourth segment. Sixth segment with four long apical setae and one short hirsute seta (5x the length of the terminal segment).

A2 (not illustrated) exopodite a small plate with two unequally long setae (the long one ca. 6x the length of the short). Terminal segment with g-seta ca. 1/3 length of y3.

Md-palp (not illustrated) with second segment with one stout hirsute β-seta (ca. 1/2 of the length of the third segment).

Mx1 (not illustrated) with terminal segment of palp apically with three claws and two setae (both ca. 1/2 length of claws).

T1 with protopodite ( Fig 17A View FIGURE 17 ) and endopodite (asymmetrical prehensile palps) ( Figs 17B–C View FIGURE 17 ). Protopodite apically with a group of 12 unequal and hirsute setae, two short smooth a-setae, one smooth b-seta and one long and smooth d-seta (6x length of b-seta), and one long and hirsute seta next to the two a-setae (2x length of d-seta). Rpp ( Fig 17B View FIGURE 17 ) with sharply pointed distal corner of first segment; second segment with curved dorsal margin. Lpp ( Fig 17C View FIGURE 17 ) shorter and narrower, distal segment sickle-shaped, smoothly curved.

T2 (not illustrated) first endopodal segment with one apical hirsute e-seta, almost reaching tip of third endopodal segment. Second endopodal segment with one apical hirsute f-seta, reaching tip of third endopodal segment. Third endopodal segment with one subapical hirsute g-seta, ca. 2x length of terminal segment. Terminal segment with one h3-seta slightly shorter than h1.

CR ( Fig 17D View FIGURE 17 ) well-developed and robust, with long proximal hirsute Sp-seta (ca. 1/2 of ramus), subapically with serrated Gp-claw, apically with long serrated Ga-claw and shorter and smooth Sa-seta.

Hp ( Fig 17E View FIGURE 17 ) with ls and ms both elongated and subequal in length. Ms distally slightly curved, ls distally slightly swollen.

Description of female. Only the differences with the male of Brasilocypria ricardopintoi gen. et spec. nov. are described here.

LVi ( Figs 18A, C–D View FIGURE 18 ) and RVi ( Figs 18B, E–F View FIGURE 18 ) higher than male. CpRl ( Fig 18G View FIGURE 18 ) as in the male; CpD ( Fig 18H View FIGURE 18 ) and CpV wider than male ( Fig 18I View FIGURE 18 ) and external surface with shallow pits and setae ( Fig 18J View FIGURE 18 ).

A1 (not illustrated) third segment ventrally with one seta slightly longer than fourth segment and dorsally with one long seta reaching tip of the fourth segment. Sixth segment with one short hirsute seta (5x length of terminal segment). Terminal segment with one short hirsute seta, ca. 2x length of aesthetasc Ya.

A2 (not illustrated) protopodite with one long apical hirsute seta reaching tip of end claws. Exopodite with one long hirsute seta (reaching tip of the second endopodal segment) and two shorter, unequally long setae (the long one ca. 6x length of the short). Third endopodal segment apically with three claws (G1, G2, G3) and three setae (z1, z2, z3).

T1 ( Fig 19A View FIGURE 19 ) with protopodite apically with a group of 12 unequal and hirsute setae; two short smooth a-setae, one short and smooth b-seta, one long and smooth d-seta (6x length of b-seta), and one long and hirsute seta next to the two a-setae (2x length of d-seta). Endopodite apically with one long and two short setae (one ca. 2/3 length of the long and one 1/2 length of the long).

CR ( Fig 19B View FIGURE 19 ) well-developed and robust, with long proximal Sp-seta (ca. 2/3 of ramus), subapically with serrated Gp-claw, apically with long serrated Ga-claw and short and smooth Sa-seta.

Ecology and distribution. Brasilocypria ricardopintoi gen. et spec. nov. was recorded from only one Brazilian floodplain (Paraná), associated with floating macrophytes. The water temperature was 28°C. The pH was 5.2 and the electrical conductivity was 31.8 μS. cm-1 (see Table 1 View TABLE 1 ).