Abstract Large and tiny Ophiomorpha nodosa Lundgren, 1891 and Thalassinoides suevicus Rieth, 1932, and the postlarval chamber Maiakarichnus currani, are described from the mid-Holocene Destacamento Rio Salado Member (northeastern Buenos Aires province, Argentina). Large specimens of O. nodosa consist of variably bifurcated horizontal galleries, connected in some cases by vertical shafts, and lined with pellets of different shape. Large T. suevicus are fewer and possess smooth outer walls. The smaller burrows of O. nodosa and T. suevicus are only a few centimeters from or even embedded in, the outer wall of the larger burrows, and are interpreted as the first settlement traces. A revised diagnosis of the spheroidal chamber M. currani, connected with O. nodosa and probably with T. suevicus, is submitted. The probable producer of these burrows and chambers is the ghost-shrimp Audacallichirus mirim. Morphological descriptions and burrowing behavior of A. mirim in modern and fossil populations from Argentina and Brazil suggest that this producer is represented at a higher level of ichnological abundance than previously recorded.

中文翻译：

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阿根廷布宜诺斯艾利斯东北部全新世中期可能的鬼虾洞穴：对繁殖和后期幼体定居行为的影响

摘要 大型和小型 Ophiomorpha nodosa Lundgren，1891 年和 Thalassinoides suevicus Rieth，1932 年，以及后期幼体室 Maiakarichnus currani，描述于全新世中期 Destacamento Rio Salado 成员（阿根廷布宜诺斯艾利斯省东北部）。O. nodosa 的大型标本由不同分叉的水平通道组成，在某些情况下通过垂直轴连接，并衬有不同形状的颗粒。大 T. suevicus 数量较少，外壁光滑。O. nodosa 和 T. suevicus 的较小洞穴距离较大洞穴的外壁仅几厘米，甚至嵌入其中，被解释为最初的定居痕迹。提交了球状室 M. currani 的修订诊断，与 O. nodosa 和可能与 T. suevicus 相关。这些洞穴和房间的可能生产者是鬼虾 Audacallichirus mirim。来自阿根廷和巴西的现代和化石种群中 A. mirim 的形态学描述和挖洞行为表明，该生产者的地质丰度水平高于先前记录的水平。