Larval development of the grooved tanner crab, chionoecetes tanneri rathbun, 1893 (decapoda: Brachyura: Majidae) described from the laboratory‐reared specimens

Abstract This paper documents the defining morphological characteristics of the larval stages of Chionoecetes tanneri Rathbun, 1893, the grooved Tanner crab, from specimens reared in the laboratory. Chionoecetes tanneri larval stages include two zoeae and one megalopa. The first zoea is characterized by: six setae on the posterior margin of the carapace; postero‐lateral spines on abdominal somites 3 and 4, extending beyond the posterior margin of adjacent somites and bearing 9–10 spinnules; 12 plumose setae and one stout distal plumose seta present on the margin of the scaphognathite of the maxilla; and one fused lateral spine and one articulated dorso‐medial spine on each fork of the telson. The second zoea is characterized by: 9 setae on the postero‐lateral margin of the carapace; a serrated mandible molar; a mandibular palp bud; 25–26 plumose setae on the margin of the scaphognathite of the maxilla; pereiopods with well‐developed gills and buds; and four pairs of stout setae on the posterior margin of ...