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«To cite this version: Aihua Yuan. Latest Permian Deep-Water Ostracod (Crustacea) Fauna from South China. Pa- leontology. Universit´ Pierre et Marie ...»

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Bairdia sp.13 Pl. 4, fig. 13

Material: One valve.

Measurements: L=251µm, H=174µm, H/L=0.69.

Remarks: This specimen differs from other Bairdia species by very steep PDB and large curvature radius of AB.

Occurrence: Latest Permian. Guizhou (sample SW13-12, Linghao Formation of Shaiwa Section), South China.

–  –  –

Material: One carapace.

Measurements: L=367µm, H=200µm, H/L=0.55.

Occurrence: Latest Permian. Anhui (sample CH 6-3-4, Dalong Formation of Chaohu Section), South China.

–  –  –

Material: One valve.

Measurements: L=756µm, H=341µm, H/L=0.45.

Remarks: I assign this specimen to the genus Bairdia McCoy, 1844 by the upward AB and PB. The poor preservation makes the designation doubtful.

58 Yuan Aihua: Latest Permian Deep-Water Ostracod (Crustacea) Fauna from South China 2008/5 Occurrence: Latest Permian. Anhui (sample CH 3-4, Dalong Formation of Chaohu Section), South China.

–  –  –

Material: Two valves.

Measurements: (without nodes) L=714-759µm, H=486-489µm, H/L=0.65-0.68.

Description: Valve with bairdian shape in lateral view; DB gently arched with three nodes, ADB short and smoothly transitional to AB, PDB inclined posteriorly with an angle of 45º; VB slightly convex, ventral part compressed to make a blade-like view; AB rounded with the maximum convexity near the mid-height, PB pointed to make a blunt bairdian beak with the maximum curvature below the mid-height; two distinct nodes near dorsal part under which there is a circular depressed area, which may indicate the inner structure of adductor muscle scar; some small nodes on the posteroventral part, other part of surface smooth.

Remarks: The present specimens much resemble Mirabairdia comisa Chen, 1982 by the ornamentation (three dorsal nodes and two lateral nodes with the depressed area), however, distinguished with the latter in the absence of generic characters of Mirabairdia. In addition, Petasobairida kozuri Crasquin-Soleau, 1998 from the Late Permian of Hydra Island, Greece and Ceratobairdia trispinosa Chen, 2002 and Petasobairdia tricornuta Chen, 2002 from the Late Permian of Guangxi Province, South China also present three nodes at DB. The compressed venter makes the present specimens be assigned to the genus Abrobairdia Chen, 1982. The specimens here differ from other Abrobairdia species by the special ornamentation.

Occurrence: Latest Permian. Guangxi (bed LQ16, Dongpan Formation of Liuqiao Section), South China.

–  –  –

Remarks: This specimen is characterized by the two spines at the extremities of DB and two spines (one broken) near DB. It differs from Abrobairdia sp.1 by strong spines instead of nodes on DB and the longer, pointed posterior beak.

Occurrence: Latest Permian. Guangxi (bed LQ22, Dongpan Formation of Liuqiao Section), South China.

–  –  –

Material: One valve.

Measurements: L=578µm, H=389µm, H/L=0.67.

Description: Valve with bairdian shape; DB strongly convex with the middle part nearly horizontal;

VB slightly concave, a blade-like border extending along AVB and PVB; anterior beak indistinct, with maximum curvature at about mid-height; posterior beak short and relatively acute with maximum curvature below mid-height; surface smooth.

Remarks: Compared with species Lobobairdia rostriformis Chen, 1982 from the Late Permian of Zhejiang, Jiangsu and Guangxi (Heshan, Yishan), South China (Chen & Shi, 1982; Shi & Chen, 1987, 2002), the present specimen has not evident concave at the AVB.

Occurrence: Latest Permian. Guangxi (bed LQ16, Dongpan Formation of Liuqiao Section), South China.

–  –  –

Material: Four valves.

Measurements: (two specimens measured) L=694-705 µm, H=360-365µm, H/L=0.51-0.53.

60 Yuan Aihua: Latest Permian Deep-Water Ostracod (Crustacea) Fauna from South China 2008/5 Remarks: The present specimens are assigned to Mirabairdia comisa Chen, 1982 by the straight DB, slightly concave ADB and AVB, distinct venterolateral ridge and depressed ventral plane. Compared with the specimens from the Permian of Jiangsu and Guangxi, South China (Chen & Shi, 1982; Shi & Chen, 2002), the specimens here (only right valves) have compressed AB and a depressed arched zone extending from the middle of DB to antero-central part of the valve.

Occurrence: Late Permian. Jiangsu (Nantong) and Guangxi (Heshan Formation of Yishan, Heshan;

beds LQ16 and LQ22, Dalong Formation of Liuqiao Section), South China.

–  –  –

1982 Petasobairdia bicornuta Chen gen. et sp. nov.; Chen & Shi: p.130, pl.6, figs.10-15.

1987 Petasobairdia bicornuta Chen; Shi & Chen: p. 46, pl.7, figs.17, 18, pl.20, fig.2.

1992a Petasobairdia bicornuta Chen; Hao: p.241-242, pl.2, figs7-9.

1994 Petasobairdia bicornuta Chen; Hao: p.88, Table 1, pl.1, figs.12, 17.

1996 Petasobairdia bicornuta Chen; Hao: p.26, pl.2, fig.1.

2004 Petasobairdia bicornuta Chen; Yi: p.558, Table 1.

Material: One valve.

Measurements: (without the spine) L=541µm, H=335µm, H/L=0.62.

Remarks: Compared with the types of Petasobairdia bicornuta Chen, 1982 from the Late Permian of Jiangsu and Hubei, South China, the specimen here has higher location of maximum curvature of anterior beak.





Occurrence: Late Permian. Jiangsu (Nantong), Hubei (Mianyang), Zhejiang (Changxing Formation), Guizhou (Changxing Formation of Zhenfeng), Fujian (Dalong Formation and Changxing Formation ) and Guangxi (bed LQ16, Dalong Formation of Liuqiao Section; Dalong Formation of Xichang Section), South China.

–  –  –

2007 Petasobairdia sp.2; Yuan et al.: p.177, pl.2, fig.18.

Occurrence: Latest Permian. Guangxi (bed 03DP2, Dalong Formation of Dongpan Section), South China.

–  –  –

Material: One valve.

Measurements: L473µm, H=300µm, H/L0.63.

Remarks: Compared with other Petasobairdia species, the two spines in the present specimen are located near the dorsum instead of along DB.

Occurrence: Latest Permian. Guangxi (bed LQ22, Dalong Formation of Liuqiao Section), South China.

Petasobairdia sp.4 Pl. 5, fig. 12

Materials: One valve.

Measurements: L=616µm, H=389µm, H/L=0.63.

Remarks: This specimen is assigned to the genus Petasobairdia by the bairdian shape, smooth surface and knobs on DB.

Occurrence: Latest Permian. Guizhou (sample SW13-12, Linghao Formation of Shaiwa Section), South China.

Genus Pustulobairdia Sohn, 1960 Type species: Bairdia? pruniseminata Sohn, 1954

–  –  –

Material: One valve.

Measurements: L758µm, H=489µm, H/L0.65.

Remarks: Compared with species Pustulobairdia spinosa (Cooper, 1946) from the Pennsylvanian of Illinois, United States and the Late Permian of Guangxi (Heshan, Yishan), South China, the present specimen has not angular junction between AB and DB and the lateral surface is not so granular.

Occurrence: Latest Permian. Guangxi (bed LQ16, Dalong Formation of Liuqiao Section), South China.

Pustulobairdia sp.1 Pl. 5, fig.13

Material: One valve.

Measurements: L=723µm, H=477µm, H/L=0.66.

Remarks: The specimen here resembles Cryptobairdia postilonga Chen, 2002 from the Late Permian of Guangxi (Shi & Chen, 2002), South China, but differs by larger H/L ratio, nearly vertical AB with very high location of maximum curvature and pustulous surface. This specimen is distinguished the Pustulobairdia aff. spinosa (Cooper, 1946) by the lateral outline.

Occurrence: Latest Permian. Guangxi (bed LQ16, Dalong Formation of Liuqiao Section), South China.

Pustulobairdia sp.2 Pl. 5, fig.15

Material: One broken valve.

Measurements: H=454µm.

Remarks: The present specimen has six (or more) knobs along DB and pustules on lateral surface. It is similar to Ceratobairdia species (e.g. Ceratobairdia venterocosta Wang, 1978 from the Permian of South China) due to the dorsal ornamentation. But the specimen here has not the ventral ala, one of the generic characters for the genus Ceratobairdia and is assigned to Pustulobairdia Sohn, 1961 according to the pustulate surface.

Occurrence: Latest Permian. Guizhou (sample SW13-12, Linghao Formation of Shaiwa Section), South China.

63 2008/5 PhD dissertation of University of Pierre Marie Curie & China University of Geosciences (Wuhan)

–  –  –

2007 Spinobairdia sp.1; Yuan et al.: p.177, pl.2, fig.15.

Occurrence: Latest Permian. Guangxi (bed 03DP2, Dalong Formation of Dongpan Section), South China.

–  –  –

2007 Bairdiacypris aff. mirautaae Crasquin-Soleau & Gradinaru, 1996; Yuan et al.: p.177, pl.3, fig.4.

Material: One valve.

Measurements: L=694µm, H=306µm, H/L=0.44.

Remarks: The presence of anterior beak suggests the assignation to family Bairdiidae. However, the declined PB does not display the characteristic of typical bairdiids. According to the elongate outline, slightly angulated and nearly straight DB and the only one typical beak, the specimen is assigned to the genus Bairdiacypris Bradfield, 1935.

Occurrence: Latest Permian. Guizhou (sample SW13-12, Linghao Formation of Shaiwa Section), South China.

64 Yuan Aihua: Latest Permian Deep-Water Ostracod (Crustacea) Fauna from South China 2008/5

Bairdiacypris sp.2 Pl. 6, fig. 4

Material: Two carapaces.

Measurements: (one specimen measured) L=526µm, H=274µm, H/L=0.52.

Remarks: These specimens are assigned to the genes Bairdiacypris Bradfield, 1935 by the sub-reniform carapace, evenly convex DB, slightly concave VB, rounded AB and PB and sub-uniform overlap along all margins. Compared with other species in this genus, the present specimens have slightly upswept PVB and have not very strongly concave VB.

Occurrence: Latest Permian. Anhui (sample CH 6-3-2, Dalong Formation of Chaohu Section), South China.

Bairdiacypris ? sp.3 Pl. 6, fig. 5

Material: One valve.

Measurements: L= 464µm, H=200µm, H/L=0.43.

Remarks: This specimen is similar in outline to Bairdiacypris fornicata Shi, 1982 from the Late Permian of Guangxi, Jiangsu and Zhejiang, South China (Chen & Shi, 1982; Shi & Chen, 1987, 2002).

However, compared with the latter, the present specimen has more elongated valve and higher location of maximum curvature of AB. More material is necessary to make more precise designation.

Occurrence: Latest Permian. Anhui (sample CH6-2-4, Dalong Formation of Chaohu Section), South China.

–  –  –

Material: Two valves.

Measurements: L= 300µm, H=144µm, H/L=0.48.

Occurrence: Latest Permian. Anhui (sample CH6-2-2, Dalong Formation of Chaohu Section), South China.

–  –  –

Material: Two valves.

Measurements: L=260-551µm, H=153-302µm, H/L=0.55-0.59.

Remarks: In outline, the present specimens are similar to Gen. et sp. 2 sensu Wang, 1978 from the Late Permian of Guizhou, South China (Wang, 1978). However, here, the PB is more acute. Due to the insufficient material, I assign them with doubt to the genus Bythocypris Brady 1880 by the elongate outline, arched DB, straight (slightly convex) VB and rounded AB and PB.

Occurrence: Latest Permian. Guizhou (sample SW13-12, Linghao Formation of Shaiwa Section), South China.

–  –  –

non 1927Bairdia glennensis Harlton, n.sp.; Harlton: p.210, pl.33, fig.10.

non 1935 Bairdia glennensis Harlton; Kellett: p.133, pl.18, figs 4a-e.

non 1960 Fabalicypris glennensis (Harlton),1927; Sohn: p.62, pl.3, figs 9-10.

1993 Fabalicypris glennensis (Harlton); Yi: p.572, pl.1, fig.14.

? 2002 Fabalicypris glennensis (Harlton); Shi & Chen: p.86, pl.23, figs 1,2.

Material: Two valves.

Measurements: (one specimen measured) L=1076µm, H=441µm, H/L=0.41.

Remarks: The specimens are assigned to Fabalicypris glennensis (Harlton) sensu Yi 1993 from the Early Permian of Fujian, South China by the elongate and trapeziform outline, straight DB, substraight VB (parallel to DB), inclined ADB and PDB and very low location of maximum curvature of PB.

However, I consider that our specimens and the specimen figured in Yi (1993) do not belong to the species F. glennensis. The holotype in Harlton (1927, pl.33, fig.10) and specimens figured in Sohn (1960, pl.3, figs 9-10) have broadly arched DB which is completely different with the present specimens and the figured specimen in Yi (1993). The specimens in Kellett (1935, pl.18, figs 4a-e) may 66 Yuan Aihua: Latest Permian Deep-Water Ostracod (Crustacea) Fauna from South China 2008/5 not belong to this species also by its straight DB and parallel DB and PB. But the specimens here differ from those in Kellett (1935) by a very low location of maximum curvature of PB.

Occurrence: Permian. Fujian (Chihsia Formation of Guangping) and Guangxi (bed LQ16, Dalong Formation of Liuqiao Section; Heshan Formation of Yishan), South China.

Fabalicypris parva Wang, 1978 Pl. 7, figs 1-12 1978 Fabalicypris parva sp.nov.; Wang: p.293, pl.2, figs 12a,b, 13a,b.

1978 Fabalicypris arcuata sp.nov.; Wang: p.294, pl.2, figs 14a,b.

1985b Fabalicypris parva Wang; Kozur: p.231, tab.2, pl.9, fig.7.

1994 Fabalicypris parva Wang; Hao: p.89, tab.1.

2004 Fabalicypris parva Wang, 1978; Crasquin-Soleau et al.: p.286, tab.1, pl.3, figs 4,5.

? 2004 Fabalicypris parva Wang; Yi: tab.1, pl.2, fig.8.

Material: Sixteen carapaces and forty-six valves.

Measurements: (twelve specimens measured) L=416-729µm, H=190-326µm, H/L=0.36-0.46.

Remarks: The present specimens are assigned to Fabalicypris parva with the following characters:



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