Choose another family AcartiidaeAegisthidaeAetideidaeArctokonstantinidaeArietellidaeAugaptilidaeBathypontiidaeBoholinidaeCalanidaeCandaciidaeCentropagidaeClausidiidaeClausocalanidaeClytemnestridaeCorycaeidaeDiaixidaeDiscoidaeEctinosomatidaeEpacteriscidaeEucalanidaeEuchaetidaeEuterpinidaeFosshageniidaeGiselinidaeHeterorhabdidaeHyperbionychidaeKyphocalanidaeLubbockiidaeLucicutiidaeMecynoceridaeMegacalanidaeMegapontiidaeMesaiokeratidaeMetridinidaeMiraciidaeMisophriidaeMonstrillidaeMormonillidaeNullosetigeridaeOithonidaeOncaeidaePalpophriidaeParacalanidaeParalubbockiidaeParapontellidaeParkiidaePhaennidaePlatycopiidaePontellidaePontoeciellidaePseudocyclopidaePseudocyclopiidaeRataniidaeRhincalanidaeRidgewayiidaeRostrocalanidaeRyocalanidaeSapphirinidaeScolecitrichidaeSpeleoithonidaeSpeleophriidaeSpinocalanidaeStephidaeSulcanidaeTemoridaeThalestridaeTharybidaeThaumatopsyllidaeTisbidaeTortanidaeUrocopiidaeincertae sedis (Calanoida)incertae sedis (Cyclopoida)

Calanoida ( Order )

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    Diaptomoidea ( Superfamily )

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 Abbreviations or symbols

issued from : J.R. Grindley in Crustaceana, 1984, supplt 7. [p.219, Fig.1].
Examples of the five groups of Pseudodiaptomidae distinguished by the arrangement of the endopodites of male P5.
Endpodites dermarcated in black in these diagram.

Nota : For Grindley (1984, p.218) there are several different groups of species which tend to constitute morphologically and zoogeographically distinct groups.
The most important charcters distinguishing the species are the P5, and in particular those of males ; in particular the arrangement of the endopods of the P5 in the males is different for each of several groups and comparable whitin each group.
All the species found round the coast of Africa form a group characterized by the possession of both left and right endopods in the P5 of the male (Grindley, 1963). Certain oriental species possess both endopods but they be separated on the possession of a ‘Y’-shaped right endopod in the male P5.
Group 1 : Both endopodites present, of which neither is greatly reduced (Calanipeda, Archidiaptomus ; Mediterranean, Ponto-Caspian region, and Cochin).
Group 2 : Both endopodites present of which the right is greatly reduced. (Africa, Asia, Australia).
Group 3 : Only the left endopodite present (North and South America).
Group 4 : Only the right endopodite present. (Asia and Australia).
Group 5 : A long curved medial projection in place of the left endopodite on the second left nasal segment ; right endopodite reduced or absent. (Asia and Australia).
Other features appear to agree, for example, the form of the P5 females (used by Sewell, 1924, in his attempt at grouping, fit the same pattern.
The simplest and apparently most primitive form of the endopodite appears to be exhibited by Calanipeda aquaedulcis and Archidiaptomus arroorus. In addition to its characteristic endopodites, C. aquaedulcis is unique among Pseudodiaptomidae in having A1 with 25 segments (primitive condition in calanoid copepods). The segmentation of the male geniculate A1 is reduced in Calanipeda, but there are more end segments beyond the articulation than in any other pseudodiaptomid. Archidiaptomus aroorus possesses a number of primitive characters and strong affinities to the family Diaptomidae ; it has been placed in this new genus because of a number of peculiar features including the fully developes left and right endopods in the male P5 ; A1 is 24-segmented which approaches the primitive condition of the Calanoida ; exopod 2-segmented of the female P5 is close to that of the typical Pseudodiaptomidae but it is unique in maintening fully developed endopods of an unusually spinous form (this appears to be a primitive or generalized condition placing this genus very close to the Diaptomidae).

issued from : J.R. Grindley in Crustaceana, 1984, supplt 7. [p.224, Fig.2].
Distribution of the five groups of Pseudodiaptomidae.

issued from : T.C. Walter, S. Ohtuska & L.V. Castillo in Proc. Biol. Soc. Washinton, 2006, 119 (2). [p.314, Table 2].
The species groups and sub-groups are based primarily on the male P5, because female characters are not consistent among and within species-groups.

issued from : T.C. Walter, S. Ohtsuka, S. Putchakarn, K. Pinkaew & S. Chullasorn in Proc. Biol. Soc. Washington, 2002, 115 (3). [p.666, Table 3].

issued from : T.C. Walter, S. Ohtsuka, S. Putchakarn, K. Pinkaew & S. Chullasorn in Proc. Biol. Soc. Washington, 2002, 115 (3). [p.663, Table 2].
Number of egg-sac(s) for the species groups of Pseudodiaptomus.