Thalamoporella rhombifera Guha & Gopikrishna 2004

Autor: Sonar, Mohan A., Pawar, Ravi V., Wayal, Dyaneshwar V.
Rok vydání: 2022
Předmět:
DOI: 10.5281/zenodo.6317766
Popis: Thalamoporella rhombifera Guha & Gopikrishna, 2004 (Fig. 13, Table 10) Thalamoporella rhombifera Guha & Gopikrishna, 2004: 25, figs 22, 23. Material examined. GIS/B 0300���0325. Argillaceous limestone in Waior-Charopadi stream near Waghot, Chhasra Formation, lower Miocene (Burdigalian), 23��25���55������ N, 68��42���40������ E, elevation 28 m, 16 January 2011, DST project, New Delhi. Description. Colonies erect, cylindrical, with dichotomously branching stems, circular in cross-section. Autozooids arranged in quincunx, rectangular, each separated from neighbours by thick, raised granular boundaries; arranged in series of alternating rows (Fig. 13A). Orifice transversely D-shaped, distally arched, proximal margin straight.Two small adoral tubercles, one on each side of orifice. Two small equal-sized opesiules, oval or subrounded, below the slanting edge of orifices away from the lateral walls of the autozooid. Frontal cryptocyst well developed, sunken below level of autozooidal margin, granular, coarsely perforated by relatively large pores (Fig. 13B). Avicularia at bifurcation of rows, narrowly elongate, symmetrical, almost 75% of autozooid length; torqued towards sibling zooid (Fig. 13C, D); rostrum tapering distally with acute tip, rounded proximally, foramen drop-shaped, c. 80% of avicularian length, the proximal part bordered by smooth cryptocyst. Ovicells not observed. Remarks. This species has an avicularium shape similar to that in the Thalamoporella hamata ��� T. falcifera ��� T. winstonae group illustrated by Soule et al. (1999, pp. 7���11, figs 4, 5, 6a, c, 7, 8), but in these species the avicularium is torqued away from the sibling zooid.
Published as part of Sonar, Mohan A., Pawar, Ravi V. & Wayal, Dyaneshwar V., 2022, Fossil Thalamoporellidae (Bryozoa) from Paleogene-Neogene sediments of western Kachchh, Gujarat, India, pp. 251-274 in Zootaxa 5104 (2) on pages 265-266, DOI: 10.11646/zootaxa.5104.2.5, http://zenodo.org/record/6280839
{"references":["Guha, A. K. & Gopikrishna, K. (2004) Fossil Thalamoporella (Bryozoa) from the Tertiary sequences of Western Kachchh, Gujarat, India. Irene McCulloch Monograph Series, 7, 1 - 51. https: // doi. org / 10.1127 / njgpm / 2004 / 2004 / 681","Soule, D. F., Soule, J. D. & Chaney, H. W. (1999) New species of Thalamoporella (Bryozoa) with acute or subacute avicularium mandibles and review of known species worldwide. Irene McCulloch Foundation Monograph Series, 4, 1 - 57."]}
Databáze: OpenAIRE
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