FIGURE 16. Jassa marmorata Holmes, 1905 in Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus

FIGURE 16. Jassa marmorata Holmes, 1905. Variation in thumb length relative to body length in males in a single population (Barren Islands Marina, Jamaica Bay Wildlife Refuge, Brooklyn, New York (40°35ʹN, 73°55ʹW), early July 1984, B. Borowsky, coll., among hydroids and Ulva on submerged docks at the marina, IZ 1984-112 (CMN). Arrows refer to the associated gnathopod illustrations. Setae omitted except for those around the thumb andspines in order to landmark position changes with growth. All views lateral. Scale 0.1 mm. Linear regression assumptions passed forthe major form male. Linear regression statistics: Major form, thumb length = -0.652 + 0.248 body length, r2 = 0.765, n = 103. Illustration after Conlan (1990).Published as part of Conlan, Kathleen E., Desiderato, Andrea & Beermann, Jan, 2021, Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus, pp. 1-191 in Zootaxa 4939 (1) on page 47, DOI: 10.11646/zootaxa.4939.1.1, http://zenodo.org/record/458062