Pseudocypretta Klie, 1932

Ferreira, Vitor Góis, Almeida, Nadiny Martins, Higuti, Janet & Martens, Koen, 2022, On a New Species of Klie, 1932 (Crustacea, Ostracoda) from the Neotropical Region, with a Discussion on the Position of the Genus., Zoological Studies 61 (77), pp. 1-23 : 4-10

publication ID

https://doi.org/ 10.6620/ZS.2022.61-77

persistent identifier

https://treatment.plazi.org/id/8C6C1409-FFA8-8D13-B190-D72D515AF31B

treatment provided by

Felipe

scientific name

Pseudocypretta Klie, 1932
status

 

Genus Pseudocypretta Klie, 1932 View in CoL

Diagnosis: Cp highly arched, sub-triangular in lateral view, rounded in dorsal and ventral views; LV overlapping RV at least anteriorly and ventrally. Coloration patchy and variable. RV with fullydeveloped marginal septa along anterior and posterior margin; LV with incomplete marginal septa. LV with a large inner list, running parallel to (part of) the anterior margin, straight and obliquely away from the posteroventral margin. RV with selvage weakly inwardly displaced along the postero-ventral margin. Both valves with external lists, most developed on LV; these lists not perforated by pores. A1 with relatively short segments. A2 with natatory setae extending beyond tips of distal claws, claw G2 more strongly developed and serrated than the other claws. Md-palps with alpha seta short, slender and smooth; beta seta short, stout and hirsute; gamma seta long, slender and hirsute. Mx1 with second palp segment rectangular, tooth bristles on third endite smooth. T2 with penultimate segment divided; seta d 2 well-developed; seta d 1 absent; claw h 2 unusually strongly curved. T3 with 4th segment separate from 3 rd, distally with seta h 2 relatively short. CR minute, with base and distal seta fused, or fully absent. Male unknown.

Type species: Pseudocypretta maculata Klie (1932) .

Other species: P. lineata Ma and Yu (2020) , P. amor sp. nov.

Differential diagnosis: Pseudocypretta is closely related to Cyprettadopsis and shares many characters and character states, but the two genera also have some important morphological differences. Cyprettadopsis is much more elongated than the three species of Pseudocypretta , it has a different arrangement of the marginal septa (anteriorly incompletely developed and posteriorly fully developed in both valves in Cyprettadopsis , fully developed in the RV and incompletely developed in the LV in Pseudocypretta ), the external lists in the two genera are differently developed, with Cyprettadopsis having additional pores there, and the inner list in the LV has a posteroventral deviation from the valve margin which is significantly larger in Pseudocypretta than in Cyprettadopsis (a longer part is straight and not following the curve of the valve margin).

Pseudocypretta amor sp. nov. ( Figs. 2–9 View Fig View Fig View Fig ) urn:lsid:zoobank.org:act:22464BB8-0498-435E-8A51-811157C10DEC

Cypretta View in CoL ” sp. 3 – Higuti et al. 2009: 664, Table 1; 2010: 267, Table 2. “ Cypretta View in CoL ” n. sp. – Matsuda et al. 2015: 326, Table 1; Higuti et al.

2017b: 5, Apêndice 1. “ Cypretta View in CoL ” sp. 3 n. sp. – Higuti et al. 2017a: e120, Table 2. “ Cypretta View in CoL ” n.sp. 3 – Pereira et al. 2017: 327, Table 2; Campos et al.

2021: 27, Table 1. “ Cypretta ” sp. 2 n. sp. – Campos et al. 2018: 6, Table 2.

Type locality: Garças Lake (PAR 982) in the Upper Paraná River floodplain. Coordinates: 22°43'31.1"S, 53°13'08.4"W.

Material examined: Holotype: 1 ñ, with soft parts dissected in glycerine in a sealed slide and with valves stored dry in a micropaleontological slide ( MZUSP 43014 View Materials ), collected in February 2014, in Garças Lake ( PAR 982 ) by Janet Higuti and Eliezer de Oliveira da Conceição . Paratypes: 3 ñ with soft parts dissected as the holotype (MZUSP 43008, MZUSP 43015 and MZUSP 43016), 6 ñ carapaces stored dry in micropaleontological slides after use for SEM illustrations (MZUSP 43009, MZUSP 43010, MZUSP 43011, MZUSP 43012, MZUSP 43013 and MZUSP 43017), collected in February 2014 in Garças Lake (PAR 982) by Janet Higuti and Eliezer de Oliveira da Conceição.

Other material illustrated: Amazon River floodplain: 1 ñ with soft parts dissected as the holotype (MZUSP 43018); 3 ñ carapaces stored dry in micropaleontological slides after use for SEM illustrations (MZUSP 43019, MZUSP 43020 and MZUSP 43021), collected in May 2012 in Poço Curuça Lake (AMA AMA59, 60) by Janet Higuti. Araguaia River floodplain: 1 ñ with soft parts dissected as the holotype (MZUSP 43022); 5 ñ carapaces stored dry in micropaleontological slides after use for SEM illustrations (MZUSP 43023, MZUSP 43024, MZUSP 43025, MZUSP 43026 and MZUSP 43027), collected in March 2012 in Varal Lake (ARA80) by Janet Higuti and Koen Martens. Pantanal: 2 ñ with soft parts dissected as the holotype (MZUSP 43032 and MZUSP 43028); 3 ñ carapaces stored dry in micropaleontological slides after use for SEM illustrations (MZUSP 43029, MZUSP 43030 and MZUSP 43031), collected in June 2003 in Corumbá Road II temporary pool (PAN 15) by Janet Higuti, Koen Martens and Kennedy Francis Roche.

Etymology: The species is named after its colour pattern on the carapace in dorsal view, which looks like the word “love” ( amor is “love” in Latin) ( Fig. 2 View Fig ).

Diagnosis: Carapace rounded in dorsal and ventral views and with sub-triangular shape in lateral view, carapace surface set with a few shallow pits; LV overlapping RV along anterior and ventral margins; LV with large outer list along anterior, ventral and posterior margins; RV with ca. 11 fully developed marginal septa; LV with septa incompletely developed. A2 with claw G2 stronger developed and serrated than other claws. Mx1 with sideways directed bristles absent; first segment of Mx1-palp with sub-apical seta present; second segment elongated, L c. twice W; first endite with three apical claws; third endite with two smooth bristles. Md-palp third segment with three dorsal setae. T1 with setae b and d absent. T2 with seta d1 absent and penultimate segment undivided, claw h 2 unusually strongly curved. T3 with fourth segment not fused with third segment and carrying three apical setae. CR fully absent. Male unknown.

Description of femal e: LVi ( Figs. 3A View Fig , 4A View Fig ) with inner lamella wide along anterior margin, absent along ventral, and narrow along posterior margins; inner groove running parallel to the ventral margin; large outer list running to halfway the anterior margin, almost parallel along the ventral margin and forming an inner groove there, and straight, not parallel to the ventroposterior margin, showing an outward doubling on this straight part; ca. 12 septa weakly developed along the anterior margin and ca. 5 septa weakly developed along the posterior margin ( Fig. 3G, H View Fig – indicated by white arrows - 4A). RVi ( Figs. 3B View Fig , 4B View Fig ) with inner lamella wide along anterior margin, absent along ventral and narrow along posterior margins; with a weak inner list along anterior-ventral margin, both inner list and inner groove along ventral margin absent; posterior margin with an inwardly displaced selvage; ca. 11 septa along the anterior margin and ca. five septa along the posterior margin ( Fig. 4B View Fig ). Central muscle scars ( Fig. 3A, B View Fig ) forming a simplified paw-print pattern, consisting of an anterior (oblique) row of 3 rounded scars of intermediate size, one large rounded scar posterior of this row and two small rounded scars below these four larger scars. CpRl ( Fig. 3C View Fig ) with a rounded, subtriangular shape; greatest height situated in the middle; LV overlapping RV at the anterior, dorsal and ventral margins. CpD and CpV ( Fig. 3D–E View Fig ) with oval shape, posteriorly slightly broader than anteriorly, the latter bluntly pointed; greatest width situated slightly posteriorly to the middle. CpV with LV overlapping RV, in the middle region with a rounded expansion; both valves with clear external list, the one on the LV valve being the largest and running along anterior, posterior and ventral valve margins. CpFr ( Fig. 3F View Fig ), with LV overlapping RV, showing the robust external list on the LV. Cp surface ( Fig. 3C–F View Fig ) with a few shallow pits and no clear setae.

A1 ( Fig. 5A) composed of seven segments. First segment with two long ventral and one short dorsal setae (ca. 1/3 the length of ventral setae). Second segment with one dorsal seta (ca. 3/4 the length of the third segment) and an elongated lateral R, only slightly shorter than the segment. Third segment with one short ventro-apical seta and one long dorsal seta (almost reaching end of terminal segment). Fourth segment with two short ventral setae (the shortest ca. 3/4 of length of the longest) and two long dorsal setae. Fifth segment with two long dorsal setae. Sixth segment with four long apical setae. Terminal segment with one long aesthetasc (Ya), one short seta (with the same length of Ya) and two long setae. WO not seen.

A2 ( Fig. 5B, C) composed of five segments (one protopodite, one reduced exopodite and three endopodite segment). Protopodite carrying two short and one long ventral seta (ca. twice the length of the short ones). Exopodite consisting of a small plate with three setae, two short and one long (reaching beyond the tip of the second endopodite). First endopodal segment with one ventral aesthetasc Y, ca. half the length of the segment; one long ventro-apical seta ca. the length of the segment and five long natatory setae (reaching beyond the tips of the G claws) and one short seta (almost reaching the tip of the second endopodal segment). Second endopodal segment with a group of four medio-ventral t setae of unequal length (two reaching halfway z2, one slightly shorter and one short), and a group of two unequally short medio-dorsal setae; three long z setae (z1, z2 and z3); and three claws (G1, G2 and G3); claw G2 stronger developed and serrated than the other two claws. Terminal segment ( Fig. 5C) with one long claw GM, and one short Gm; one aesthetasc y3 and its accompanying seta (slightly longer than y3); seta g absent.

MdCoxa ( Fig. 5D) a plate with ca. six apical teeth intercalated with setae; one hirsute sub-apical seta on the dorsal margin.

MdPalp ( Fig. 6B, C View Fig ) four segmented. First segment ventrally with plumose setae S1 and S2; one long smooth seta and one short α seta (ca. 1/6 the length of the smooth seta). Second segment ventrally with a short cone-shaped and hirsute β seta and three long smooth setae; dorsally with a group of three subequal but long setae. Third segment dorsally with a group of four subequal setae; apically with three long setae and one long hirsute seta γ. Last segment ( Fig. 6C View Fig ) with three claws and one seta.

Mx1 ( Fig. 6A View Fig ) composed of a two-segmented palp, three endites and a large respiratory plate (the latter not illustrated). Basal segment of the palp with a group of five unequally long apical setae and one lateral seta. Terminal segment elongated (L ca. twice W), apically with three claws. First endite with two large bristles; and one medio-lateral seta (ca. slightly longer than the endite). Third endite with two basal setae. (Remark: chaetotaxy of endites incomplete, also in figure 6A, only major features described).

T1 ( Fig. 6D View Fig ) composed of an endopodite and a protopodite. Endopodite a conical palp, apically with three hirsute setae, two equally long and one short (ca. 2/3 the length of the longer ones). Protopodite with two equally short a-setae, and eight apical hirsute and unequally long setae; setae b and d missing.

T2 ( Fig. 6E View Fig ) composed of a five segmented walking leg. First segment with seta d 1 absent. Second segment with a smooth seta d 2. Third segment with apical seta e hirsute and long (reaching beyond the middle of the fourth segment). Fourth segment medially with seta f hirsute and long; and apically with a small seta g (reaching half the length of terminal segment). Terminal segment rectangular, apically with one short ventral setae h 1, a long and strongly curved claw h 2, and a short dorsal seta h 3.

T3 ( Fig. 6F View Fig ) composed of four segments. First segment elongated, with one short hirsute seta d 1 and two slightly longer and hirsute setae dp and d 2. Second segment elongated, with a short hirsute apical seta e. Third segment with small hirsute sub-apical seta f, (1/4 the length of the segment). Terminal (4 th) segment separated from penultimate (3 rd) segment (candonid type), with one long, thin and hirsute seta h 1, one clawlike seta h 2 and one short hirsute seta h 3, the latter not reflexed.

CR fully absent.

Male unknown.

Measurements of illustrated specimens: See table 1.

Remarks: For comparative purposes, additional illustrations of valves and carapaces are given for populations from the Amazon River floodplain ( Fig. 7 View Fig ), the Araguaia River floodplain ( Fig. 8 View Fig ) and the Pantanal ( Fig. 9). The individuals of these Brazilian floodplains share the same characteristics in the carapace, valves and appendages, despite some small size differences observed (see Table 1). The LVi of Pseudocypretta amor sp. nov. from the Pantanal shows some damage in the dorsal position, resulted from the dissection. Several trials were made with other individuals to obtain an undamaged LVi but were unsuccessful owing to the fact that these valves were slightly decalcified and the soft parts were stuck by the adductor muscles to this valve. The decalcification of these valves, however, allows to see the marginal septa in the LV ( Fig. 9A, H), even with non-transparent microscopy.

Differential diagnosis: The new species can be distinguished from Pseudocypretta lineata by the presence of linear ridges on the carapace surface in P. lineata (valve are smooth in P. amor sp. nov.); the anterior part of the inner list in the LV runs much higher in P. lineata ; the Cp is wider in P. lineata and the greatest width is situated behind the middle, while also the posterior part is somewhat invaginated; the setae on the last segment of T3 are shorter and the CR is completely absent in P. amor sp. nov.

The new species is more similar to P. maculata , but differs from it by the fact that in P. maculata the RV clearly overlaps the LV at the posterior region, while in Pseudocypretta amor sp. nov. both valves extend equally there; the Cp is more highly arched in P. maculate and the colouration is reduced to isolated spots; the A2 on P. maculata has a short terminal segment (L less than 1.5x W), while in P. amor sp. nov. the L is ca. 1.5x W; the last segment of the T3 has a long-reflexed seta h 3 in P. maculata , while in Pseudocypretta amor sp. nov., this seta h 3 is short and is not reflexed; P. maculata has a CR as a reduced flagellum, while the CR is fully absent in P. amor sp. nov. These differences are summarized in table 2.

Ecology and distribution: Pseudocypretta amor sp. nov. was recorded in the four main Brazilian floodplains, Amazon, Araguaia, Pantanal, and Paraná, with the major distance between two of these floodplains of 2.300 km ( Fig. 1 View Fig ). The species was recorded in a wide range of environmental variables, such as 17.1–35°C for WT, 5.71–8.23 for pH, 8.1–222.5 µS.cm -1 for EC and 1–7.28 mg.L -1 for DO. The species was associated with the root systems of aquatic macrophytes and was also collected from sediment. Detailed information about environmental data is listed in table 3.

Kingdom

Animalia

Phylum

Arthropoda

Class

Ostracoda

Order

Podocopida

Family

Cyprididae

Loc

Pseudocypretta Klie, 1932

Ferreira, Vitor Góis, Almeida, Nadiny Martins, Higuti, Janet & Martens, Koen 2022
2022
Loc

Cypretta

Matsuda JT & Lansac-Toha FA & Martens K & Velho LFM & Mormul RP & Higuti J. 2015: 326
Higuti J & Lansac-Toha FA & Velho LFM & Martens K. 2009: 664
2009
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