110
Journal of Paleontology 91(1):100–115
Figure 9. Swarm of Yunnanocopia longicauda new genus new species. Scale bar = 1 cm.
of Eucopia. Thus, we place the two species within a single genus until additional information warrants creation of a second genus.
Figure 8. (1) Reconstruction of Eucopiidae species indeterminate. (2) Reconstruction of Yunnanocopia grandis new genus new species. (3) Reconstruction of Yunnanocopia longicauda new genus new species. C = cervical groove, Ex = exopod of uropod, PC = pre-cervical groove, P1– P6 = pleonites 1–6, R = rostrum, S = antennal scale, T = telson, T7– T8 = thoracic somites 7 and 8, 1–3 = articles 1–3 of basal element of antennule. Drawings not to scale.
(Fig. 9). The presence of a rostrum on Y. longicauda is problematic. An elongate structure is present on LPI-41569, however it is displaced slightly from the longitudinal axis and its relationship to the carapace is not clear. The feature is called out (Fig. 5.2), but its identity must be questioned. No similar structure is evident on other specimens. The question remains to be resolved as to whether these
differences warrant assignment to different genera or whether they can be united into a single genus. Examination of the form of the antennular base of three species of the extant Eucopia— E. australis Dana, 1852, E. grimaldii Nouvel, 1942, and E. linguicauda Tattersall, 1955—demonstrates the third basal element is vastly different in the three species. That element on E. australis widens distally in concave arcs, and terminates in a broad, digitate margin. The third element on E. linguicauda is similar in having a digitate margin, but it forms the outer side of a triangular element. The third element of E. grimaldii is somewhat smaller, triangular, and the outer margin is undulose, rather than digitate. The shape of the carapace and the relative difference in length of pleonite 6 on the extant E. sculpticauda and E. unguiculata also differ markedly. Pleonite 6 is 1.6 times as long as pleonite 5 in E. sculpticauda, and 3.5 times as long as pleonite 5 in E. unguiculata. Pleonite 6 is 1.5 times as long as pleonite 5 in Yunnanocopia grandis and 2.2 times as long as pleonite 5 in Y. longicauda. The range in variation of morphology exhibited by Y. grandis and Y. longicauda compares well with that seen in extant species
Eucopiidae, species indeterminate Figures 10.1–10.5, 11.1–11.5
Description.—Small eucopiid. Carapace appears to be short relative to pleon, poorly preserved. Oostegites with arcuate, thickened anterior rims, disarticulated. Pleon with six pleonites in ventral view; pleonite 1 is
shorter than 2, 2 is shorter than 3, 3 slightly longer than 4, 4 and 5 same length, 6 appears longer than 5; Pleon nearly equal width for entire length. Width is 32% length excluding telson. Apodemes weakly convex forward, becoming concave
forward at lateral margins. Pleon is about twice as long as cephalothorax. Each somite is rimmed posteriorly. Telson and uropods not well preserved. Telson seems to be
longer than wide, quadrate, weakly convex lateral margins, with tiny, sharp spines at posterolateral corners. Uropods with broad, ovate basal segment, longer than wide. Endopod and exopod extend beyond tip of telson. Outer edge of exopod of uropod with thickened rim, may be serrate proximally. Uropods appear to have longitudinal striations.
Materials.—LPI-32802 (part), 41335a, 42567, RMFCES1, RMFCES2, RMFCES 3, RMFCES4-1, RMFCES4-2, RMFCES4-3.
Remarks.—Nine specimens examined in detail were used to frame the above description. The specimens are small and invariably incomplete, so that framing a description sufficient to erect an additional species is not prudent. The specimens do exhibit characters that distinguish them from Yunnanocopia grandis and Y. longicauda. The pleuron, which is longer than the poorly preserved carapace, has convex lateral margins, so that the widest part of the pleon is at pleonite 3. The telson is longer than wide, has convex lateral margins, and bears tiny spines on the posterolateral corners. The uropods are incom- pletely preserved only, suggesting that they are as long as, or
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