Pseudoligoneuria/f(1)=Chromarcys/g(1), or Chromarcys

(Panephemeroptera Euephemeroptera Euplectoptera Anteritorna Bidentiseta Branchitergaliae  
Eusetisura DiscoglossataChromarcys)

Nomen hierarchicum: Pseudoligoneuria/f(1)=Chromarcys/g(1) [f:1939; g:1932]

In circumscription fits:

gen. Chromarcys Navás 1932: 927

gen. Pseudoligoneuria Ulmer 1939: 540

subfam. Pseudoligoneuriinae Ulmer 1939: 653

subfam. Chromarcyinae Demoulin 1953a: 8

fam. Chromarcidae: Tshernova 1970: 128

Pseudoligoneuria/f(1)=Chromarcys/g(1): Kluge 2004: 138

Synonyms: subjective synonyms of with conspecific type-species: 

Pseudoligoneuria/fg [fg:1939] (typus P. fuernborni);

Chromarcys/fg [f:1953; g:1932] (typus Ch. magnifica

(subjective synonymy: magnifica [Ch.] = fuernborni [P.]).

References. Navas 1932: ; Ulmer 1939: ; Demoulin 1953a: / ; 1967a: ; Edmunds & Allen & Peters 1963: ; Tshernova 1970: ; Kluge 2004: .

Autapomorphy of Chromarcys.

(1) Larval, subimaginal and imaginal paracercus is diminished, several times shorter than cerci (but not vestigial, several times longer than 10th abdominal segment) (Ulmer 1939: Fig.390; Demoulin 1967a: Fig.1d). Non-unique apomorphy (see Index of characters [2.3.22]).

Plesiomorphies of Chromarcys (unlike Geminovenata). All tergalii, including pair I, are attached dorsally and have the same structure [see Discoglossata (1)]. In imago and subimago: Mesonotal suture is normally developed, nearly transverse, not shifted posteriorly; separate sclerite forming posterior half of medioscutum is present in subimago only (Kluge 2004: Fig.42:D), while in imago the whole medioscutum is evenly sclerotized. Anterior paracoxal suture is not curved posteriorly. Middle and hind legs are functional, with ephemeropteroid claws (Kluge 2004: Fig.42:G). Wings with many intercalaries and crossveins; number of intercalaries, unlike Geminovenata, is not only non-reduced, but even increased if compare with other mayflies: additional intercalaries are present in widened field between MP1 and MP2 (Kluge 2004: Fig.42:A-B). Pedestals of gonostyli are large, with well-developed muscles (as in Isonychia/fg1 and Coloburiscus/fg1); border between 1st and 2nd segments of gonostyli is retained; penis has simple structure (Kluge 2004: Fig.42:C). Cerci are not soft, segmented, with irregular setae (Demoulin 1967a: Fig.1d) (unlike many Geminovenata).

Variable character of Chromarcys. On hind wing bifurcation of MA is shifted distally (Kluge 2004: Fig.42:B) or lost (Demoulin 1953a: Fig.1b; 1967a: Fig.1b) (it is lost also in Geminovenata; probably synapomorphy).

Size. Fore wing length 1627 mm.

Distribution. Oriental Region.

Nominal species in Pseudoligoneuria/f(1)=Chromarcys/g(1): 

 fuernborni Ulmer 1939 [Pseudoligoneuria] syn.subj. magnifica [Chromarcys]

 magnifica Navás 1932 [Chromarcys] -,

See also: 

Chromacys spp.

Discoglossata INCERTAE SEDIS