Ophiomorpha nodosa Lundgren1891 is described from Puente de Pascua Formation Late Pleistocene of northeastern Buenos Aires province. The pelletal morphology and the base of ramifications of O. nodosa burrows are compared with mid-Holocene, Late Pleistocene Pehuen-Có locality and southern Brazil records. The preservation between sites differs in the degree of erosion and weathering, in situ or ex situ provenance, fragmentary shafts with or without branching and degree of cementation. These comparisons between sites suggest that different environmental conditions have generated the accumulation of trace fossils in transgressive and highstand depositional environments from foreshore through offshore. Neoichnological observations ascribe the burrowing of Ophiomorpha to ghost shrimps. For South American records Audacallichirus (formerly Sergio) mirim Rodrigues and Hödl, 1990 has been suggested as the producer, due to the similarity in morphology between modern and fossil burrows, and geographic distribution of ghost-shrimps. Finding of a widespread ichnotaxon possibly produced by the same taxon in different environmental conditions in the southwestern Atlantic suggests behavioral plasticity. The paleoenvironment of Puente de Pascua Formation in the level with Ophiomorpha burrows is interpreted a tidal flat in intertidal to subtidal depositional environments and relatively calm waters.

Ophiomorpha nodosa Lundgren1891是从布宜诺斯艾利斯省东北部的Puente de Pascua组晚更新世描述的。比较了O. nodosa洞穴的颗粒形态和分枝基础与全新世中期，晚更新世Pehuen-Có地区和巴西南部的记录。站点之间的保存在原位或非原位的侵蚀和风化程度不同物产，有或没有分支的零散竖井和胶结程度。这些地点之间的比较表明，不同的环境条件已经在从前岸到近海的海侵和高位沉积环境中积累了痕量化石。新时代的观察结果表明，鸦片穴居于鬼虾。对于南美记录Audacallichirus（原塞尔吉奥）米林由于现代和化石洞穴之间的形态相似以及鬼虾的地理分布，建议将Rodrigues和Hödl（1990）作为生产者。在西南大西洋的不同环境条件下，发现同一生物分类可能产生的广泛的鱼类生物分类，这表明行为可塑性。鸦片洞穴位于Puente de Pascua组的古环境被解释为潮间至潮下沉积环境和相对平静的水域中的潮滩。