Zhou, J. -p. (1989). Chalaroschwagerina (fusulinid) from Longlin, Guangxi. 微体古生物学报 - Acta Micropalaeontologica Sinica. 6(3): 257-268.

340745

Zhou, J. -p.

1989

6(3): 257-268

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Specimens of the genus chalaroschwagerina described in this paper were collected by the writer and his colleagues in 1982 from the early Lower Permian Changmo Formation in the Longlin County, Guangxi, with 15 species (including 3 new species), namely, Chalaroschwagerina inflata Skinner et Wilde, C. tumentis Skinner et Wilde, C. pulchra Skinner et Wilde, C. globularis Skinner et Wilde, C. decora Skinner et Wilde, C. formosa Skinner et Wilde, C. ampla Skinner et Wilde, C. turgida (Thompson et Wheeler), C. parampla Zhou, Sheng et Wang, C. yunnanica (Zhang), C. vulgaris (Schellwien), C. globosa (Schellwien), C. gigantea sp. nov., C. changmoensis sp. nov. and C. laxa sp. nov., mostly occurring in association with Pseudofusulina, Laxifusulina, Schwagerina and Pamirina.Since Skinner and Wilde (1965) erected the genus Chalaroschwagerina with Chalaroschwagerina inflata Skinner et Wilde as the type species, as many as 15 species (listed in the Chinese text) have been described and referred to this genus by various authors. In the paper, other species also considered to be referable to this genus include C. globosa (Schellwien), C. turgida (Thompson et Wheeler). C. tumida (Skinner et Wilde), C. zhasuosuoensis (Zhang), C. quasivulgaris (Sheng et Sun), C. gieantea sp. nov., C. changmoensis sp. nov. and C. laxa sp. nov., which are characterized by having loosely coiled whorls, strongly fluted septa, well-developed phrenotheca and large proloculus.In the Longlin county. Chalaroschwagerina made its first appearance in the Lower part of the Changmo Formation, and died out in the upper Upper part of the same formation, belonging to early Early Permian in age.Description of New SpeciesChalaroschwagerina gigantea sp. nov. (P1. ?, figs. 3—5)Shell very large, elongate to highly fusiform, strongly vaulted in median part, bluntly pointed in poles. Whorls loosely coiled. Spirotheca thick, composed of tectum and coarse alveolar keriotheca, 0.17mm thick in sixth volution. Septa strongly fluted from pole to pole. Phrenotheca well-developed. Proloculus large. Remarks This new species is one of the largest in the genus Chalaroschwagerina known at present. It can be distinguished from Chalaroschwagerina inflata Skinner et Wilde by its larger shell, very loosely coiled whorls and larger form ratio.Chalaroschwagerina chanmoensis sp. nov. (P1. ?, fig. 9)Shell very large, inflated-fusiform, strongly vaulted in median part, bluntly pointed in poles. Adult shell possessing 7 volutions about 13.2mm long and 7.6mm wide, with a form ratio of about 1.74:1. Widths of successive volutions about 1.2, 1.95, 2.74, 3.6, 5, 6.4mm and 7.6mm respectively. Whorls loosely coiled. Spirotheca thick, composed of tectum and thick keriotheca, 0.16mm thick in third volution and 0.18mm thick in seventh. Septa strongly fluted throughout the shell. Septal folds narrow and high, extending to the top of septa. Phrenotheca developed. Proloculus very large.Remarks This species is closely similar to Chalaroschwagerina ampla Skinner et Wilde, but differs in having very large shell and proloculus, loosely coiled volution, fairly thick spirotheca, and well-developed phrenotheca.Chalaroschwagerina laxa sp. nov. (P1. ?, figs. 4—6)Shell of medium size, inflated-fusiform, strongly vaulted in median par; slopes slightly concave, bluntly pointed in poles, whorls loosely coiled. Spirotheca thin, composed of tectum and keriotheca, 0.026mm thick in third volution. Septa intensely fluted throughout the shell. Chomata only seen in proloculus. Phrenotheca developed. Proloculus large.Remarks This is one of the smallest species of Chalaroschwagerina, not resembling any of its congeners,

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