Laboratory of Bioecology and Crustacean Systematics (LBSC), Department of Biology, Faculty of Philosophy, Sciences and Letters at Ribeiro Preto (FFCLRP), University of So Paulo (USP), Av. Bandeirantes 3900, Ribeiro Preto 14040-901, Brazil..
Laboratory of Biology of Marine and Freshwater Shrimp, Department of Biological Sciences, Faculty of Sciences, So Paulo State University; Av. Luis Edmundo Carrijo Coube, 14-01, Vargem Limpa, 17033-360, Bauru, So Paulo, Brasil..
Zootaxa. 2022 Aug 8;5174(1):46-54. doi: 10.11646/zootaxa.5174.1.3.
The description of the first zoea stage of Tetraxanthus rathbunae Chace, 1939, the third known zoea of Pseudorhombilidae and the first for Tetraxanthus, was carried out from laboratory hatched larvae. Their morphology differs from other pseudorhombilid species previously described primarily in the number and type of setae on the antennule, antennal exopod, maxilla, first maxilliped, and second maxilliped. These zoeae, however, share the same number of spines on the carapace (rostral, dorsal, and lateral), absence of the endopod on the antenna, long and well-developed spinose protopod, maxillary exopod with four marginal plumose setae and a robust posterior process, the absence of setae on the basis of the second maxilliped, and the presence of three lateral spines on each side of the furca. The results obtained in the present study are of great importance in being only the third known first stage pseudorhombilid zoea and the first for the Tetraxanthus, as well as in contributing to the identification of brachyuran planktonic zoea. Additionally, it also provides information that can help elucidate pseudorhombilid phylogeny.
报道了三疣梭子蟹蚤状幼体第一期的形态特征，这是已知的第三个伪菱形蚤状幼体，也是 Tetraxanthus 的第一个。该描述基于实验室孵化的幼虫。它们的形态与先前描述的其他伪菱形蚤状幼体不同，主要在于触角、触角外肢、大颚、第一大颚足和第二大颚足的刚毛数量和类型。然而，这些蚤状幼体在甲壳上具有相同数量的刺（额刺、背刺和侧刺）、触角内肢缺失、长而发达的具刺原肢、大颚外肢具 4 根边缘刚毛和一个强壮的后突起、第二大颚足基部无刚毛以及每侧有 3 个侧刺。本研究的结果非常重要，因为这是第三个已知的伪菱形蚤状幼体第一期，也是 Tetraxanthus 的第一个，并且有助于鉴定短尾类浮游幼体。此外，它还提供了有助于阐明伪菱形蚤状幼体系统发育的信息。
