Lepidophthalmus Holmes, 1904

Type species: Lepidophthalmus eiseni Holmes, 1904, by monotypy, gender masculine. = Lepidophthalmoides Sakai, 2011.

= Thailandcallichirus Sakai, 2011.

Emended diagnosis. Carapace with rostral spine. Cornea dorsal, subterminal, disk-shaped. Antenna 1 peduncle longer and stouter than antenna 2 peduncle. Maxilliped 3 exopod minute or absent, ischium-merus rectangularly elongate, broadly subpediform; merus not projecting beyond articulation with carpus; propodus subovate, inferior margin broadly lobiform. Chelipeds unequal, major with meral hook, major chela heavy. Pleon dorsally lacking strong surface pattern of grooves and integumental glands on pleomeres 3–5. Pleopod 1 slender and uniramous, pleopod 2 slender and biramous, pleopods 3–5 foliaceous and biramous in both sexes; appendix interna of pleopod 2 distal in both sexes, digitiform in female, digitiform or obscurely fused with broad appendix masculina in male as part of single subspatulate appendix, stubby, embedded in margin of endopod in both sexes on pleopods 3–5; uropodal endopod subtrapezoid, terminally angular; telson wider than long, terminally weakly convex, subtruncate, or trilobate.

Included species. Lepidophthalmus bocourti (A. Milne-Edwards, 1870) [Callianassa]; Lepidophthalmus eiseni Holmes, 1904; Lepidophthalmus grandidieri (Coutière, 1899) [Callianassa]; Lepidophthalmus jamaicense (Schmitt, 1935) [= Callianassa jamaicense jamaicense Schmitt, 1935]; Lepidophthalmus louisianensis (Schmitt, 1935) [= Callianassa jamaicense louisianensis Schmitt, 1935]; Lepidophthalmus manningi Felder & Staton, 2000; Lepidophthalmus rafai Felder & Manning, 1998; Lepidophthalmus ranongensis (Sakai, 1983) [Callianassa] [= Thailandacallichirus ranongensis]; Lepidophthalmus richardi Felder & Manning, 1997; Lepidophthalmus rosae (Nobili, 1904) [Callianassa]; Lepidophthalmus siriboia Felder & Rodrigues, 1993; Lepidophthalmus sinuensis Lemaitre & Rodrigues, 1991; Lepidophthalmus socotrensis Sakai & Apel, 2002; Lepidophthalmus tridentatus (von Martens, 1868) [Callianassa]; Lepidophthalmus turneranus (White, 1861) [Callianassa]; Lepidophthalmus statoni Felder, 2015; Lepidophthalmus natesi Felder & Robles, 2015; Lepidophthalmus panamensis Felder & Robles, 2015.

Remarks. Membership of the genus Lepidophthalmus is herewith revised to include 18 described species. Fifteen of these taxa were represented in the preceding molecular phylogenetic analysis (absent only L. ranongensis, L. rafai, and L. socotrensis of the known species) and joined in a highly-supported clade, comprehensively represented in the present analyses, and partially represented in previous analyses (Felder et al. 2003; Felder & Robles 2009). Segregation of any subclade within this group for recognition as an independent genus is avoided, as the levels of separation (by branch length or concatenated tree support values) are not comparable to those generally accorded generic status in topology of the Callichirinae (see Robles et al. 2009). Even at minor branch levels within the genus, L. eiseni, which was proposed type species of a separate genus Lepidophthalmoides Sakai, 2011, shares a minor supported clade with Lepidophthalmus bocourti, type species of Lepidophthalmus. This places into synonymy the genus Lepidophthalmoides proposed by Sakai (2011), which was apparently based on some misunderstanding of previous descriptions, illustrations, and maturational variation in the gonopod (see above). Furthermore, it nullifies a lapsus by Sakai (2011) in proposing L. eiseni as the type species of a new genus, when it is already the type species of the genus Lepidophthalmus. We also herewith continue to include Lepidophthalmus ranongensis in the genus as was the case in a morphologically based phylogenetic analysis of Tudge et al. (2000), rather than adopting its reassignment to a separate monotypic genus as proposed by Sakai (2011). The described muddy habitat of this species (Sakai 1983) and diagnostic morphology appear to rather closely conform to those of congeners. Lacking sequence-quality specimens for molecular study, and in the absence of comparative morphological analyses to contradict the findings of Tudge et al. (2000), we place Thailandcallichirus into the synonymy of Lepidophthalmus.