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Diandongia pista Rong, 1974
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| This interesting fossil brachiopod of the species Diandongia pista exhibits some epibionts. During its lifetime, this brachiopod was colonized by several organisms. The epibionts resemble serpulids or possibly Archotuba sp.. According to Zhang et al. (2010), the following epibionts have been documented in Diandongia pista: Archotuba conoidalis (Hou et al., 1999) and Longtancunella chengjiangensis (Hou et al., 1999), as well as small oval epibionts ("ovoid epizoan lesser than 2 mm"). However, the colonization observed in this specimen differs in growth form, being more strongly and irregularly curved. This indeed suggests a resemblance to serpulids. The associated shell deformations of this Diandongia pista indicate a live colonization. The work by Qianping et al. (2014) demonstrates that Archotuba conoidalis was not selective when colonizing hard substrates. Even isolated trilobite shells were inhabited. However, it remains unclear how Archotuba potentially compensates for its host's growth. This Diandongia pista is undoubtedly a very interesting specimen. The fossil brachiopod measures approximately 10 mm. Lei, Qianping & Han, Jian & Ou, Qiang & Wan, Xiao-Qiao. 2014: Sedentary habits of anthozoa-like animals in the Chengjiang Lagerstätte: Adaptive strategies for Phanerozoic-style soft substrates. Gondwana Research. 25. 966–974. 10.1016/j.gr.2013.01.007. Zhang, Zhifei, et al. 2010 : “Epibionts on the Lingulate Brachiopod Diandongia from the Early Cambrian Chengjiang Lagerstätte, South China.” Proceedings: Biological Sciences, vol. 277, no. 1679, pp. 175–81. JSTOR, http://www.jstor.org/stable/40506105. | |||
Location: | Chengjiang, eastern Yunnan Province, South China | ||
| Size Matrix: | about 41 x 29 mm | ||
| Age: | Lower Cambrian, Heilinpu Fm., Yu'anshan Member, (about. 522 Mill. y.o.) | ||
Product no.: 11391