Charybdis japonica, preserved male cl. 54.0 mm, off Marina di Ravenna: A); crusher chela, surface appears worn; B) fifth pereopod, arrow points to the totally worn postero-distal tooth on merus; C) telson Material examined: Adriatic Sea: 1 male CL 54.0 mm, CW 80.2 mm, off Marina di Ravenna, 44°27.81'N 12°19.11'E, 8 m depth, 5 June 2019; 1 male CL 72.3 mm, CW 105.5 mm, 1-mile South of the entrance to Ravenna harbor, [44°28.8'N 12°19.3'E], 8 m depth, 22 July 2021. Description: Carapace 1.46 -1.49 times as broad as long, dorsal surface bare or with sparse very short setae, with minutely granulate protogastric, mesogastric, metagastric and epibranchial ridges; without ridges behind the epibranchial ridge; anterolateral margin with six sub-equal acute teeth; five on the left side in the largest specimen, by fusion of 4 th and 5 th tooth in a single large tooth (Fig. 3); front with 3 pairs of triangular teeth, the median slightly overreaching the others. Sixth abdominal somite

Contexts in source publication

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... the crab died, the tooth on posterior margin of merus of swimming legs was almost completely worn out (compare Fig. 1A and Fig 2C). In addition, the surface of the chela looked eroded and, small areas of the body and the legs had cuticle damages, as from action of chitinolitic bacteria. ...

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... propodus; dactylus length. 1.5 times wider than long, with lateral margins evenly convex. Chelipeds stout, merus inner margin with 3 triangular teeth, outer margin unarmed, crusher chela with squamiform markings on proximal half of under surface, 3 granulose costae on outer surface and 5 acute teeth on upper surface, partly worn in the first crab (Fig. 2B). Fifth pereopods with posterior margin of propodus not denticulate, fringed with short plumose setae, merus length/width ratio 1.6, with acute postero-distal tooth (Figs. 1, 3), almost completely worn out in the first crab, when died (compare Fig. 1A and Fig 2C). The first specimen (Fig. 1A) had a lighter and more mottled coloration ...

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... stout, merus inner margin with 3 triangular teeth, outer margin unarmed, crusher chela with squamiform markings on proximal half of under surface, 3 granulose costae on outer surface and 5 acute teeth on upper surface, partly worn in the first crab (Fig. 2B). Fifth pereopods with posterior margin of propodus not denticulate, fringed with short plumose setae, merus length/width ratio 1.6, with acute postero-distal tooth (Figs. 1, 3), almost completely worn out in the first crab, when died (compare Fig. 1A and Fig 2C). The first specimen (Fig. 1A) had a lighter and more mottled coloration compared with the specimen caught off Ancona in 2006 (FROGLIA 2012, fig. ...

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... 2012, fig. 1), the second (Fig. 1B) had a more uniform brown-violet color. All specimens with a whitish spot on branchial region, and teeth on chelae and antero-lateral margins of carapace with brownish tip and a narrow white ring. Considerable variability in color patterns was also observed in the New Zealand population (SMITH et al., 2003) (Fig. 2.) The size of the second specimen (CW 105.5 mm, weight 300 g) approaches the maximum size (CW 116 mm) recorded for the species in the northernmost population of the West Pacific (KOLPAKOV & KOLPAKOV, 2011). Biometrical data for the specimens collected in the Adriatic Sea are summarized in Table ...

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... the crab died, the tooth on posterior margin of merus of swimming legs was almost completely worn out (compare Fig. 1A and Fig 2C). In addition, the surface of the chela looked eroded and, small areas of the body and the legs had cuticle damages, as from action of chitinolitic bacteria. ...

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... propodus; dactylus length. 1.5 times wider than long, with lateral margins evenly convex. Chelipeds stout, merus inner margin with 3 triangular teeth, outer margin unarmed, crusher chela with squamiform markings on proximal half of under surface, 3 granulose costae on outer surface and 5 acute teeth on upper surface, partly worn in the first crab (Fig. 2B). Fifth pereopods with posterior margin of propodus not denticulate, fringed with short plumose setae, merus length/width ratio 1.6, with acute postero-distal tooth (Figs. 1, 3), almost completely worn out in the first crab, when died (compare Fig. 1A and Fig 2C). The first specimen (Fig. 1A) had a lighter and more mottled coloration ...

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... stout, merus inner margin with 3 triangular teeth, outer margin unarmed, crusher chela with squamiform markings on proximal half of under surface, 3 granulose costae on outer surface and 5 acute teeth on upper surface, partly worn in the first crab (Fig. 2B). Fifth pereopods with posterior margin of propodus not denticulate, fringed with short plumose setae, merus length/width ratio 1.6, with acute postero-distal tooth (Figs. 1, 3), almost completely worn out in the first crab, when died (compare Fig. 1A and Fig 2C). The first specimen (Fig. 1A) had a lighter and more mottled coloration compared with the specimen caught off Ancona in 2006 (FROGLIA 2012, fig. ...

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... 2012, fig. 1), the second (Fig. 1B) had a more uniform brown-violet color. All specimens with a whitish spot on branchial region, and teeth on chelae and antero-lateral margins of carapace with brownish tip and a narrow white ring. Considerable variability in color patterns was also observed in the New Zealand population (SMITH et al., 2003) (Fig. 2.) The size of the second specimen (CW 105.5 mm, weight 300 g) approaches the maximum size (CW 116 mm) recorded for the species in the northernmost population of the West Pacific (KOLPAKOV & KOLPAKOV, 2011). Biometrical data for the specimens collected in the Adriatic Sea are summarized in Table ...