Microconchids are a little-known group of vermiform invertebrates whose fossil record is limited to the preservation of their calcareous tubes. In the past, they were erroneously classified as polychaetes, specifically of the genus Spirorbis. Nonetheless, currently it is known that serpulid polychaetes appeared in the late Permian and earliest true Spirorbis appeared in the Miocene. Microconchids are characterized by an initial bulb, microlamellar microsctructure, and a punctate tube. In this work, Microconchus maya is described as a new species from the Monte Redondo locality (Roadian, middle Permian) of the Paso Hondo Formation in Chiapas, Mexico. The new species, along with hederelloids, bryozoans, and crinoid holdfast occur as sclerobionts on brachiopods. The occurrence of most microconchids on spire-bearing brachiopod shells suggests that inhalant currents were crucial to the settlement of M. maya. However, their settlement preference on the anterior region of brachiopods could imply that microconchids only colonised places far away from the sediment. The age of the microconchids was established by means of the host brachiopods which have been correlated to Roadian formations of Texas in the USA. Microconchids and brachiopods formed life associations, inhabiting an environment related to the open waters of a homoclinal carbonate ramp. The description of M. maya not only represents the first definite record of the genus Microconchus in the Permian but also is the first report of a possible syn-vivo relationship between brachiopods and microconchids in the late Paleozoic.

微锥虫是鲜为人知的无脊椎动物，其化石记录仅限于钙质管的保存。在过去，它们被错误地归类为多毛类，特别是Spirorbis属。尽管如此，目前已知在二叠纪晚期出现了瑟普利德多毛羚，在中新世出现了最早的真正的Spirorbis。微conconchis的特征是最初的球，微层微结构和点状管。在这项工作中，Microconchus maya被描述为来自墨西哥恰帕斯州Paso Hondo组的Monte Redondo地区（罗马尼亚，中二叠纪）的新物种。这种新物种与硬皮纲动物，苔藓动物和类固醇保持在一起，作为腕足动物的硬皮cle。携带尖塔的腕足动物壳上大多数微micro虫的出现表明，吸入气流对玛雅支原体的沉降至关重要。。然而，它们在腕足类动物的前部区域的沉降偏好可能暗示微锥只在远离沉积物的殖民地栖息。微壳虫的年龄是通过寄主腕足动物来确定的，这些寄主臂足动物与美国德克萨斯州的Roadian地层有关。微con和腕足类动物形成了生活联系，居住在与单斜碳酸盐岩坡道的开阔水域有关的环境中。的描述M.玛雅不仅代表属的第一明确记录Microconchus二叠，而且是在晚古生代腕足和microconchids之间的可能的顺式体内关系的第一份报告。