Mao et al.—New early Permian crinoid fauna 92(6):1066–1080


Occurrences.—Early Permian, late Sakmarian, Callytharra Formation, Western Australia, Australia; Permian, Artinskian, Basleo, West Timor; Taiyuan Formation, Dajian Member, early Permian (Asselian), Anyang, Henan, North China Block.


Description.—One well-preserved dorsal cup small, medium conical, truncate base with shallow basal concavity, length 4mm, width 12.5mm, perfect pentameral symmetry except very small anal plate articulated to mutual shoulders of C–D radial (Fig. 5.11); plate ornamentation nodose, flush sutures; basals and radials expand in width distally constant to slightly increasing rate of distal widening. Basals three, low, unequal, with small one in A–E interray, length 1.5mm; the basal circlet visible in side view of cup, width 7mm; ratio of basal circlet length/distal basal circlet width is 0.21, and basal plate circlet 37.5% of aboral cup length. Radials up-flaring, length 2.5mm, distal-to-proximal radial plate width ratio about 1.79; radial articular facets plenary, subhorizontal, narrowing orally, triangular shape, with transverse ridge and ligament pit; anal notch obvious V-shape on distal extremities of adjacent C and D radials. Column circular.


Material.—Figured specimen NIGP 166475.


Remarks.—Webster (1987) pointed out that the degree of the anal notch of Synbathocrinus has varied throughout the geolo- gical range of the genus and is not a reliable specific or generic character and recommended the suppression of Taidocrinus as a subjective junior synonym of Synbathocrinus.


Synbathocrinus chenae new species Figure 5.12–5.15


Holotype.—NIGP 166476.


Diagnosis.—Distinguished by low bowl-shaped cup, slender elongate anal plate, relatively long, wide transversely convex brachials.


Occurrence.—TaiyuanFormation,DajianMember,earlyPermian (Asselian), Anyang, Henan, North China Block.


Description.—Crown elongate, slender (Fig. 5.12, 5.13), length 32mm; cup small, broadly bowl-shaped, length 5.5mm, width 19mm; sutures between plates slightly impressed; plate sculp-


turing coarse nodes; basal circlet slightly impressed. Radials five, subquadrangular in outline, slightly wider than long, length 5.2mm, width 6.8mm, distal inclinate; narrow and deep con- cavity between radials and primibrachials; articular facets plenary. Anal plate slender, elongate, in notch on C and D


radials, and nearly out of the cup (mostly above the cup). Arms five, long and slender, atomous, closely appressed when enclosed, only seven primibrachials preserved in each ray; first primibrachial approximately as wide as radial, quadrangular, gently convex, length 4.7mm, width 6.8mm; second primibra- chial wider than long, length 3mm, width 5.7mm; brachials relatively long, wide, convex; longitudinal ridges present in middle of each brachial. Column circular.


1077


Etymology.—The specific name honors Mrs. Chen Guangjü, the holotype collector.


Material.—Holotype: NIGP 166476, only known specimen of this species.


Remarks.—The holotype NIGP 166476 of S. chenae n. sp. is elongate and slender, and the distal portions of the arms are not


preserved (Fig. 5.12, 5.13). The basal of the cup is crushed and flattened, resulting in an elliptical column scar and small basal circlet (Fig. 5.14). S. chenae n. sp. is assigned to the Synbathocrinidae on the


basis of confinement of the elongate and slender crown, small bowl-shaped cup, wide and inclinate radial articular facets, five arms, and anal plate notching upper corners of C and D radials and nearly out of cup. It differs from most Synbathocrinus species in the low bowl-shaped cup and relatively long, wide, and convex brachials.


Subclass Camerata Wachsmuth and Springer, 1885 Infraclass Eucamerata Cole, 2017


Order Monobathrida Moore and Laudon, 1943 Suborder Glyptocrinina Moore, 1952


Superfamily Platycrinitacea Austin and Austin, 1842 Family Platycrinitidae Austin and Austin, 1842 Genus indeterminate species indeterminate Figure 4.13–4.19


Occurrence.—Taiyuan Formation,DajianMember, early Permian (Asselian), Anyang, Henan, North China Block.


Description.—Several loose ossicles of unidentified platycrini- tids, including two columnals (Fig. 4.13, 4.14), three radials (Fig. 4.15–4.17), and two basal circlets (Fig. 4.18, 4.19). NIGP 166477–166478, two columnal nodals, much wider


than long, bearing elliptical articula with latus smooth; angular divergence of upper and lower fulcra about 65° on opposite sides of the nodals in facet view. NIGP 166479–166481, radial plates, subquadrangular in


outline, being slightly wider than long; articulate facets rather narrow, less than half width; NIGP 166479 (length 10.2mm, width 11.8mm) and NIGP 166480 (length 10.2mm, width 11.2mm) quite smaller with a smoother surface than NIGP 166481 (length 18mm, width 20.5 mm). NIGP 166482 and 166483, two different basal circlets with


perfect pentamerous symmetry; NIGP 166482, three smooth plates, width 30mm; NIGP 166483, five plates with irregular nodes on the surface, width 21.2mm.


Materials.—Figured specimens NIGPA 166477–166483.


Remarks.—Ausich and Kammer (2009) summarized the gen- eric concepts of Platycrinitidae. The occurrence of thecal ossi- cles of Platycrinites in lower Permian rocks has been reported several times from Australia (Etheridge, 1892; Marez Oyens, 1940; Webster and Jell, 1999b), Timor (Wanner, 1916), China (Tien, 1926), Russia (Yakovlev and Ivanov, 1956), the United States (Webster and Lane, 1967; Broadhead and Strimple, 1977), and Oman (Webster and Sevastopulo, 2007).


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