TABLE 1 in A new genus and species of Eusiridae (Crustacea, Amphipoda, Amphilochidea) from bathyal sediments off the southwestern Gulf of Mexico

TABLE 1. Major morphological differences between Pseudorhachotropis longipalpus gen. nov., sp. nov. and the known Eusiridae genera worldwide.
GeneraBodyAccessory flagellumMandible molarMandible palpCoxa 1Coxa 4 posterior lobeGnathopodsPereopodsTelsonCleonardoSmooth1-articulate; elongateStrongly triturativeArticle 1 very short; 2–3 variablesQuadrate; unproduced anteriorlyPresentNot or scarcely eusiridElongate; slenderElongate; cleff half lengthDoroteaSmooth1-articulate; shortSlightly triturativeArticle 1 short: 2–3 subequal in length.Quadrate; unproduced anteriorlyRudimentaryNot eusirid; propodus palm obliquePereopods 5–7 basis wideElongate 1/3 cleftEusirellaNone1-articulate,Slightly triturative or simpleArticle 1 and 3 shortStrongly produced anteriorlyNoneNot eusirid; carpus elongatePereopods 3–7 slender; dactylus simpleCleft less than half-length or incisedEusirogenesSlightly carinate1-articulateStrongly triturativeArticle 1 shortNot produced anteriorlyWeaklyNot eusiridPereopods 3–7 elongate; simpleWeakly cleftEusiropsisSmooth1-articulate; vestigialSlightly triturativeArticle 1 shortNot produced anteriorlyPresentEusirid formPereopods 3–7 elongateElongate; weakly cleftEusirusSmooth1-articulate; elongateStrongly triturativeArticle 1 shortNot produced anteriorlyPresentEusirid formPereopods 3–7 elongate; simpleElongate; weakly cleftHarcledoSmoothAbsentStrongly triturativeArticle 1 shortNot produced anteriorlyWeaklyNot eusiridPereopods 3–7 elongate; simpleElongate; cleftMetarhachotropisSmoothvestigialColumnar, slightly triturativeArticle 1 shortProduced anteriorlyWeaklyNot eusiroidPereopods 3–7 elongate; basis of 7 wideElongate; cleftMeteusiroidesPartially toothedAbsentStrongly triturativeArticle 1 shortSlightly produced anteriorlyPresentNot eusiridPereopods 3–7 elongate; simpleElongate; cleftPareusirogenesSmoothAbsentColumnar; triturativeArticle 1 shortNot produced anteriorlyNoneEusirid formPereopods 3–4 shorter than 7VariableRhachotropisCarinate- toothed1–2 articulate; shortStrongly ttriturativeArticle 1 shortStrongly produced anteriorlyNone or weaklyNot eusiridPereopods 3–7 elongate; simpleElongate; cleft to entireSennaiaPartially toothed.AbsentNo triturativeArticle 1 shortNot produced anteriorlyNoneNot eusiridPereopods 5–7 slender; with bifid dactylusElongate; 3 x longer than wideTriquetramanaSmooth1-articulateStrongly triturativeArticle 1 shortNot produced anteriorlyPresentEusirid formPereopods 3–7 slender; 7 wide proximallyElongate; deeply cleftPseudorhachotropis gen. nov.Carinate- toothed5-articulate, longNo triturative with large robust setaeArticle 1 long; subequal in length 2Slightly produced anteriorlyNoneNot eusiridPereopods narrow; 3–4 shorter than restAs long as wide; “V" inverted shape
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