Phyllocarida, Packard, 1879

Racheboeuf, Patrick, Phuong, Ta Hoa, Hung, Nguyen Huu, Feist, Monique & Janvier, Philippe, 2006, Brachiopods, crustaceans, vertebrates, and charophytes from the Devonian Ly Hoa, Nam Can and Dong Tho formations of Central Vietnam, Geodiversitas 28 (1), pp. 5-36: 22

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Phyllocarida  gen. et sp. indet. ( Fig. 16A View FIG )

A single probable phyllocarid representative has been collected at Ly Hoa, in an isolated block near locality 4 ( Fig. 1C View FIG ). Despite its questionable taxonomic assignment and its poor preservation, it is mentioned here in order to call the attention of future investigators. The specimen ( Fig. 16A View FIG ) was found on the bedding plane of a white, silty level, interbedded with sandstone beds. It was possibly complete initially, yet disarticulated, and its carapace, as well as its abdomen and appendages are strongly weathered. Its assignment to phyllocarid crustaceans rests on the ornament preserved on a small part of the carapace, which exhibits only narrow, undulating and anastomosing longitudinal ridges (a, Fig. 16A View FIG ), of either ceratiocaridid or rhinocaridid type ( Rolfe 1969; Racheboeuf 1994). Another carapace fragment of the same specimen, which may possibly belong to the posterior margin of the carapace, looks like a rounded margin and bears two short, laterally flattened spines, suggestive of the carapace margin of several representatives of the genus Echinocaris   . Two, flattened fragments with a possibly spinose margin (b, Fig. 16A View FIG ) may be abdominal segments.