In this paper, data about ontogenetic variation of dermal ossicles in Pseudothyone belli, a species widely distributed in the western Atlantic are provided. These data are important since juveniles often lack many of the characters used to identify adult specimens and in some cases, they have been described as separate species. The main differences between juveniles and adults are related to the form of knobbed buttons in the body wall (adults). The juveniles have four-holed and multilocular buttons, whereas the adults have only (or predominantly) four-holed buttons. Additional differences are related to the plates, which are knobbed in juveniles and smooth in adults. Although these ossicles are subject to wide variation, the ossicles from the introvert and tentacles are quite consistent in both juveniles and adults. In addition, a new species of Sclerodactylinae, collected along of the Brazilian coast is here described. Havelockia smirnovi sp. nov. is characterized by having two pillared body wall tables; discs four-holed, with oval and undulating margins; spire often undeveloped or ending in few teeth (2–4). Introvert with rosettes and two-pillared tables; table pillars united at the top and forming a cluster of teeth. Tentacles with rosettes and tube feet with two-pillared supporting tables, arched plates and end plates.

本文研究了假性甲状腺素中真皮小骨的发生变化提供了在西大西洋广泛分布的物种。这些数据非常重要，因为未成年人通常缺乏用于识别成年标本的许多特征，在某些情况下，它们被描述为单独的物种。少年和成年人之间的主要区别与身体壁（成人）的纽扣形式有关。少年有四眼和多眼按钮，而成年人只有（或主要是）四眼按钮。其他差异与板块有关，这些板块在青少年中呈球形，在成年人中呈光滑状。尽管这些小骨的变化很大，但无论是幼年还是成年的，内向和触手的小骨都很一致。另外，这里描述了沿巴西海岸收集的新菌核科。Havelockia smirnovi sp。十一月 其特点是有两个立柱的壁柜；圆盘四孔，边缘椭圆形和起伏；尖顶通常不发达或末端很少牙齿（2-4）。性格内向，有莲座丛和两柱桌；餐桌支柱在顶部结合在一起，形成一簇齿。触手有玫瑰花结和管脚，带有两个支柱的支撑台，拱形板和端板。