Pugettia, Dana, 1851

Ohtsuchi, Naoya, Komatsu, Hironori & Li, Xinzheng, 2020, A New Kelp Crab Species of the Genus Pugettia (Crustacea: Decapoda: Brachyura: Epialtidae) from Shandong Peninsula, Northeast China, Species Diversity 25, pp. 237-250 : 249

Genus Pugettia in East Asian Waters

1. Cardiac, branchial regions elevated conically. Postorbital lobe strongly bent downwards on lateral margin, completely fused with lamellar hepatic lobe. Cheliped merus faintly elevated in outer surface, almost triangular in cross section. Ambulatory legs propodi strongly compressed. Mesial lobe of G1 distinctly short........ P. incisa [Japanese name (hereafter JN): Yahazu-mo-gani]

— Caradiac, branchial regions elevated roundly. Postorbital lobe not markedly bent downwards on lateral margin, fused basally with distally spiniform hepatic lobe. Cheliped merus distinctly elevated in outer surface, rectangular in cross section. Ambulatory legs propodi subcylindrical. Mesial lobe of G1 long.......... 2

2. Lateral margin of basal antennal article not separated at basis from suborbital region. Ambulatory legs meri with faint, upper distal tubercle in extensor margin; carpi with faint, median depression on extensor surface. G1 mesial lobe projected nearly perpendicular to dorsal lobe, strongly curled downwards. In full-grown males, fingers widely gaping; movable finger with 2 or 3 strong, isolated teeth on proximal one-third of cutting margin.......... P. quadridens [JN: Yotsuha-mo-gani]

— Lateral margin of basal antennal article separated at basis from postorbital margin sometimes by protrusion. Ambulatory legs merus with distinct, upper distal tubercle in extensor margin; carpi with distinct, median depression on extensor surface. G1 mesial lobe projected anteriorly obliquely, gradually curved downwards. In full-grown males, fingers gaping narrowly or slightly; movable finger without strong, isolated teeth on proximal part of cutting margin................. 3

3. Gastric region with four rudimentary or distinct tubercles. Mesobranchial region elevated roundly with two or three tubercles of variable distinctness. Cheliped merus dorsal surface obtusely ridged, not crested, with non-lamellar, rather spiniform teeth................ 4

— Gastric region with no visible tubercules. Mesobranchial region not markedly elevated. Cheliped merus dorsal surface with distinctly ridged, crested, with three lamellar teeth......................................... 6

4. Posterior end of hooked setae rows on gastric region posterior to basis of hepatic lobe. Posterior end of supraorbital eave lateral margin truncate. Orbital hiatus deep, rectangular concavity. Posterior margin of hepatic lobe bent laterally. Mesial lobe of G1 elongate, projected anteriorly. Female gonopore elongate....................... P. intermedia Sakai, 1938 [JN: Yotsuha-modoki]

— Posterior end of rows of hooked setae on gastric region much anterior to basis of hepatic lobe. Posterior end of supraorbital eave lateral margin rounded. Orbital hiatus deep, broad concavity. Posterior margin of hepatic lobe bent laterally. Mesial lobe of G1 moderately long, projected anteriorly obliquely. Female gonopore comma-shaped...................................... 5

5. The slope from hepatic region to hepatic lobe tip shallowly concave or weakly sinuous. Basal antennal article basally with acute protrusion. P2 merus five to seven times longer than height, shorter than cheliped merus in full-grown males. Mesial margin of G1 apex distinct from mesial margin of ventral lobe.................. P. ferox Ohtsuchi and Kawamura, 2019 [JN: Oh-yotsuha-mo-gani]

— The slope from hepatic region to hepatic lobe tip almost straight. Basal antennal article basally with round protrusion. P2 merus eight times longer than height, longer than cheliped merus in any ontogenetic stages. Mesial margin of G1 apex continuous to mesial margin of ventral lobe......................................... P. longipes n. sp. [JN: Ashinaga-yotsuha-mo-gani]

6. Pseudorostral spines 0.36–0.47 as long as postrostral carapace length. Postorbital lobe slightly compressed dorsoventrally, mesially-inclined triangular, directed anteriorly, with apex slightly incurved. Hepatic lobe much longer than postorbital lobe. Found from mud, gravel, rock bottom................................. P. pellucens Rathbun, 1932 [JN: Ko-yotsuha-mo-gani]

— Pseudorostral spines 0.24–0.39 as long as postrostral carapace length. Postorbital lobe compressed dorsoventrally, isosceles triangular, directed anterolaterally. Hepatic lobe as long as or longer than postorbital lobe. Found from small red algal turfs..................... P. vulgaris Ohtsuchi, Kawamura, and Takeda, 2014 [JN: Arasaki-mo-gani]