Labioporella hariparensis Guha & Gopikrishna, 2007

Sonar, Mohan A., Pawar, Ravi V. & Wayal, Dnyaneshwar V., 2022, Newly discovered species of cheilostomatid Bryozoa from the Miocene of western Kachchh, Gujarat, India, European Journal of Taxonomy 821, pp. 16-39 : 31-34

Labioporella hariparensis Guha & Gopikrishna, 2007

Fig. 11 ; Table 10

Labioporella hariparensis Guha & Gopikrishna 2007b: 805 , pl. I figs 4–6.

Material examined

INDIA • 16 specs; argillaceous limestone in Waior-Charopadi stream near Waghot , Burdigalian, lower Miocene, Chhasra Formation; 23°25′55″ N, 68°42′40″ E; Jan.–Feb. 2012; Pawar leg.; GIS/B 0533 to 0548 .

Description

Colony unilaminar, encrusting. Autozooids hexagonal, rounded distally ( Fig. 11A ). Lateral margins beaded, thickly calcified, raised in relation to autozooidal frontal shield; autozooidal boundaries also marked by thin grooves. Cryptocyst coarsely granular, occupying nearly ⅔ of autozooidal frontal surface and descending smoothly into the orifice; polypide tube slender, opening into the orifice with mediumsized lateral indentations ( Fig. 11B ). Two conspicuous tubercles at distolateral corners of each autozooid ( Fig. 11C ). Opesia rounded quadrangular, wider than long with smooth curved distally. Avicularia small, interzooecial, oval; cryptocyst narrow; opesia large, oval with broader proximal; rostrum thick, prominent, next distal zooid arise from rostral margin of avicularia ( Fig. 11D ).

Remarks

The present species shows a superficial resemblance to Labioporella filiparietis Canu & Bassler, 1935 in the shape of the autozooids and the polypide tube but differs in having a granular cryptocyst, and the presence of avicularia and tubercles. The Aquitanian species Labioporella bassleri Guha & Gopikrishna 2007 from Kharinadi Formation differs in not having avicularia or tubercles. The Gran Canarian Pliocene Labioporella sp. Sendino & Taylor, 2014 differs from the present species in the absence of avicularia, a stout polypide tube and the distal margin of the opesia is higher than wide.

Figures

Fig. 11. Labioporella hariparensis Guha & Gopikrishna, 2007 (GIS/B 0533). A. General view of the colony showing autozooids. B. Enlargement of an autozooid showing cryptocyst and polypide tube. C. Close-up of the colony showing autozooid with proximal tubercles. D. Enlargement of the colony showing ancestrula and interzooecial avicularia.