CLADOENDESIS OF EPHEMEROPTERA
Fimbriatotergaliae - Potamanthus/fg1)
Nomen hierarchicum: Potamanthus/fg1 [f:1888; g:1843] (incl. Rhoenanthus)
In circumscription fits:
"series I of group II": Eaton 18831888: 77
"section 4 of genera": Eaton 18831888: 78
tribus Potamanthini: Lameere 1917: 68
subfam. Potamanthinae: Jacobson & Bianchi 1905: 873
fam. Potamanthidae: Klapalek 1909: 9
superfam. Potamanthoidea: McCafferty 2004: 88
Potamanthus/fg1: Kluge 2000: 251
Systematic position of Potamanthus/fg1. About possible uniting of Potamanthus/fg1 with Caenotergaliae and Ephemerella/fg1 see "Classifications of Furcatergaliae I"
References. Eaton 18831888: * *; Edmunds & Allen & Peters 1963: *; Tshernova 1970: * *; Koss & Edmunds 1974: ; Bae & McCafferty 1991: * * *; Kluge 2004: * * * *.
Autapomorphy of Potamanthus/fg1.
(1) On fore wing AA forms a fork which is either symmetric, or has an anterior branch arising forward from the main stem; no one branch arises backward from the main stem (Kluge 2004: Fig.68:A). In other mayflies AA is either non-branched or has one or several branches arising backward from the main stem (Kluge 2004: Fig.71:A, 81:A).
Apomorphies of Potamanthus/fg1 common with Caenotergaliae and Ephemerella/fg1 (see Classifications of Furcatergaliae I).
(2) In larva [which has collar on pronotum see Fimbriatotergaliae (1)] mesonotum also has a collar a concave band at anterior margin, separated from the rest part of mesonotum by a transverse crest (Kluge 2004: Fig.67:BC). The same in Euthyplocia/fg1 and Caenotergaliae; the same mesonotal collar in Ephemerella/fg1.
(3) Dorsal (initially anterior) surface of larval fore femur can bear a transverse row of setae (as in Kluge 2004: Fig.89:H): regular row is present in some Rhoenanthus/g1, vestigial row in selected specimens of Potamanthus/fg3 lutea [E.]; in other Potamanthus/fg2 this row is absent. The same in Caenotergaliae and Ephemerella/fg1 only.
(4) Tergalius I [different from others see Fimbriatotergaliae (6)] is stick-like, setose, attached on a prominent cylindrical pedestal arisen from anterior part of the abdominal segment I close to metathorax (the same in Caenotergaliae and Ephemerella/fg1 only); pedestal is sclerotized (the same in Caenotergaliae); tergalius itself is subdivided to 2 segments (Kluge 2004: Fig.67:A) (the same occurs in Neoephemera/fg1).
(5) Egg with 2 polar caps and several (812) anchors; each anchor consists of a terminal knob and a skein of threads which surround the knob in a form of regular ring (Bae & McCafferty 1991: Fig.7679). Similar caps and anchors are present in Ephemerella/fg1, and caps also in some Caenotergaliae.
(6) In cubital field of fore wing [see Anteritorna (1)] several (25) veins go from CuA to basitornal and tornoapical margins; they are usually bifurcate (Kluge 2004: Fig.68:A: x, y), rarely simple. The same in Caenotergaliae and Ephemerella/fg1 (which initially have 13 bifurcate veins), as well as in selected specimens of Ichthybotus, Ephemera/fg9, and Pentagenia (which have 36 bifurcate or simple veins) and some others (see Index of characters [2.2.51]).
Non-unique characters of Potamanthus/fg1 of unclear phylogenetic status.
(7) Mandibular tusks [see Fimbriatotergaliae (8)] are curved medially. The same in Euthyplocia/fg1, Ichthybotus and Polymitarcys/f1=Ephoron/g2; probably symplesiomorphy.
(8) Maxilla [see Fimbriatotergaliae (10)] on apical-ventral side close to base of canines has a field of densely and regularly situated long setae (Kluge 2004: Fig.68:C; Elpers & Tomka 1994: Fig.4a-d). The same in Euthyplocia/fg1 and Ephemerella/fg1, and a similar field in Leptophlebia/fg1 (see Index of characters [1.1.32]).
(9) In imago and subimago proximal part of gonostylus is integral, boundary between 1st and 2nd segments being non-expressed (the same in Euthyplocia/fg1 and some others). Both distal segments are always retained, thus gonostylus is 3-segmented.
Plesiomorphies of Potamanthus/fg1. In larva: Maxilla with 3 canines and 2 dentisetae [see Bidentiseta (1)] (Kluge 2004: Fig.68:C). Maxillary palp is 3-segmented; labial palp is 3-segmented (unlike Cryptoprosternata in Fossoriae). Larval (and adult) patella-tibial suture is developed on middle and hind legs only. Larva retains long abdomen able to make undulate swimming movements; caudalii with dense secondary swimming setae equally developed on lateral and median sides of cerci and lateral sides of paracercus [see Furcatergaliae (6)]. All tergalii IVII [modified see Fimbriatotergaliae (6)] are present; tergalii IIVII are spread by sides of abdomen, not bent dorsally (the same in Euthyplocia/fg1, unlike Fossoriae and Caenotergaliae).
In imago and subimago: Mesonotal suture is moderately stretched posteriorly, and subimaginal mesonotal cuticle has pigmented areas of characteristic shape [see Fimbriatotergaliae (2)] (Kluge 2004: Fig.68:F). Furcasternal protuberances are contiguous (Kluge 2004: Fig.68: D) (unlike Campsurus/fg1, Caenotergaliae and some others see Index of characters [2.2.23]). Hind wing is well-developed, as long as 0.350.4 of fore wing length (Kluge 2004: Fig.68:B). Imaginal and subimaginal claws are ephemeropteroid (exception can be made by male imaginal fore legs only see below).
Variable characters of Potamanthus/fg1. Eyes of male from large (as in majority of Ephemeroptera) to small as in female. In male imago on fore legs claws can be ephemeropteroid (in Rhoenanthus/g1 speciosus [Rh.]), more often both claws are blunt (while in subimago they are aways ephemeropteroid).
Size. Fore wing length 719 mm.
Distribution. Holarctic and Oriental Region; dominate in Oriental Region.
|The taxon Potamanthus/fg1 is divided into:|
1. plesiomorphon Rhoenanthus/g1