Table 4 in Discovery of a new species and host record of Holophryxus Richardson, 1905 (Isopoda: Dajidae) from the central Arctic: a model of enhanced descriptive standards for epicaridean isopods

Table 4. Salient male morphological characters of valid Holophryxus species, including (1) shape of anterior margin of cephalon, and pleon, (2) degree of fusion/ separation of pereonites and pleon, (3) morphology of antennule (A1) and presence/absence of flagellum, (4) segmentation of antenna (A2) and length relative to posterior margin of (incorporated) first pereonite, and (5) proportional length of pleon (% of total body length measured in dorsal aspect). Species are arranged in chronological order.
SpeciesCephalon an-Fusion 1stA1A1 flagellumA2 segmentationA2 length vs.Pereonites 2–7PleonPleon/terior marginpereonitepereonite 1bodylength (%)Ho. alaskensisSlightly rounded/CompleteWith lobateAbsent?At least to2–6 free, 7 fusedOblong-conical30–38straightbaseposteriordorsally toFusedmarginpleonHo. giardi?????????Ho. richardiRoundedComplete???Not to posterior2–6 free, 7 fusedOblong-conical38margindorsally toFusedpleonHo. acanthephyraeRoundedCompleteBilobatePresent2-segmentedNot to posterior2–6 free, 7 fusedConical31–40Non-articulatedmargindorsally toFusedpleonHo. fusiformisRoundedCompleteTrilobatePresent2-segmented?Not to posterior2–4 free, 5–7Oblong-conical40Bi-articulatedmarginfused dorsallyFusedand to pleonHo. polyandrusRoundedComplete????2–7 completelyOblong-conical45freeFreeHo. quadratahumeraleRoundedComplete????2–6 free, 7 fusedOblong-conical35dorsally toFusedpleonHo. citriformisWeakly concaveIncompleteTrilobatePresent?2-segmentedBeyond posterior2–7 completelyBroadly35Spinous projectionmarginfreepyriformFree