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Plesiomorphon Acentrella/fg2

 (Panephemeroptera Euephemeroptera Euplectoptera Anteritorna pm.Tridentiseta  
Tetramerotarsata Liberevenata Turbanoculata  
Anteropatellata Baetovectata Baetungulata Baetofemorata Acentrella/fg1 - pm.Acentrella/fg2)

Nomen hierarchicum: Acentrella/fg2 [f:2011; g:1912] (sine Tanzaniops, Jubabaetis)

In circumscription fits:

— subgen. Acentrella: Novikova & Kluge 1987: 16

— gen. Acentrella: Waltz & McCafferty 1987e: 558

— Acentrella/fg2 = gen. Acentrella = subgen. Acentrella: Kluge & Novikova 2011: 13

References. Waltz & McCafferty 1987: * * translation; – Kluge & Novikova 2011: * * *

Plesiomorphies of Acentrella/fg2. Unlike Jubabaetis/g1, larval tarsus without ventral subapical seta.

(1) Unlike Jubabaetis/g1, flat denticles, which form a row on mola of left mandible, are longer than 1/2 of the distal molar projection and begin close to it (Kluge & Novikova 2011: Fig.102).

(2) Unlike Tanzaniops, mentum has paraglossal muscle oblique and overlapping glossal muscle ventrally (Kluge & Novikova 2011: Fig.39, 101).

(3) Unlike Jubabaetis/g2, larval tarsus lacks ventral subapical seta (Kluge & Novikova 2011: Fig.48).

(4) Imaginal and subimaginal tarsus has maximum number of apical spines: middle and hind tarsi of both sexes have 3 apical spines, i.e. 1st+2nd, 3rd and 4th tarsomeres are spine-bearing (Kluge & Novikova 2011: Fig.5); fore tarsus of female also has 3 apical spines, i.e. 2nd, 3rd and 4th tarsomeres are spine-bearing (Kluge & Novikova 2011: Fig.4) [see Tetramerotarsata (1) and Acentrella/fg1 (10)] (see Index of characters [2.2.78.2], [2.2.83]).

Size. Fore wing length 3–6 mm(see Tetramerotarsata).

Distribution. Holarctic and Oriental Regions.

Nominal species in Acentrella/fg2:

almohades Alba-Tercedor & El-Alami 1999 [Acentrella]

carolina Banks 1924 [Cloeon] — syn.subj. turbidum [Pseudocloeon] 

chantauensis Kluge 1981 [Baetis]  --/

charadra Sroka & Arnekliev 2010 [Acentrella]  --/

diptera Kluge & Novikova 2011 [Acentrella]  --/

fenestratum Kazlauskas 1963 [Pseudocloeon]  --/

feropagus Alba-Tercedor & McCafferty 2000 [Acentrella]  /

fimbriata Tungpairojwong & Phalai-Ngam & Jacobus 2022 [Acentrella]

glareosa Sroka & Arnekliev 2010 [Acentrella] — syn.subj. sibiricum [Pseudocloeon]

gnom Kluge 1983 [Pseudocloeon]  --/

hyalopterum Bogoescu 1951 [Pseudocloeon] — syn.subj. inexpectatum [Pseudocloeon] 

inexpectatum Tshernova 1928 [Pseudocloeon]  --/

insignificans McDunnough 1926 [Baetis]  

isacki Srinivasan & Sohil & Sivaruban Barathy & Sharma 2023 [Acentrella (Acentrella)]

joosti Zimmermann & Braasch 1979 [Baetis]  /

lapponica Bengtsson 1912 [Acentrella] — typus nominis Acentrella --/

latum Müller-Liebenau 1985 [Pseudocloeon]  

nadineae McCafferty & Waltz & Webb 2009 [Acentrella]

pseudatrebatinus Grandi 1948 [Baetis] — syn.subj. sinaica [Acentrella] 

scabriventris Kluge & Novikova 2011 [Acentrella]  --/

sibiricum Kazlauskas 1963 [Pseudocloeon]  --/

sinaica Bogoescu 1931 [Acentrella]  

squamatus [Baetis (Acentrella)] nomen nudum  — syn.subj. charadra [Acentrella]

subatrebatinus Grandi 1956 [Baetis] — syn.subj. sinaica [Acentrella] 

tonneri Braasch & Soldan 1983 [Baetiella]  nomen dubium

turbidum McDunnough 1924 [Pseudocloeon]  

ultimum Müller-Liebenau 1985 [Pseudocloeon] — syn.subj. gnom [Pseudocloeon]

Examined also:

sp.n. gr. inexpectatum, cf. gnom --/

sp.C: Kluge & Novikova 2011 

See also:

Baetovectata INCERTAE SEDIS

Turbanoculata INCERTAE SEDIS