EPHEMEROPTERA OF THE WORLD

Cont. Ref. arb.sig. Gen.

z   

Baetis * Nigrobaetis * Labiobaetis * Acentrella * Baetiella

references:  

PHYLOGENY OF EPHEMEROPTERA

Cont. Ref. Classif. Gen.

z 

Acentrella/fg1 * pm.Acentrella/fg2

Ќовикова ≈.ј.,  люге Ќ.ё. 1987. —истематика рода Baetis (Ephemeroptera, Baetidae) с описанием нового вида из —редней јзии // ¬естник «оологии є4: 8Ц19.  

[Novikova E.A. & Kluge N.J. 1987. Systematics of the genus Baetis (Ephemeroptera, Baetidae), with description of new species from Middle Asia]. // Vestnik Zoologii є4: 8Ц19]

Table from Novikova & Kluge 1987: p.9 
English translation

B Ц characters peculiar for Baetis; C Ц characters peculiar for Cloeoninae; N, T, L, A, BL Ц characters peculiar for Nigrobaetis, Takobia, Labiobaetis, Acentrella and Baetiella.

No.

characters

subgenera of Baetis s.l.

 

larva:

Baetis_s.str.

Nigrobaetis

Takobia

Labiobaetis

Acentrella

Baetiella

1

mandibles

B: with straight outer margin

B: with straight outer margin

C: with convex outer margin (Fig.2:3-6)

B: with straight outer margin (Fig.4:19)

B: with straight outer margin

B: with straight outer margin

2

setae between prostheca and mola (at least left)

B: absent 

C: present

C: present (Fig.2:3-6)

B: absent (Fig.4:18-19)

B: absent

B: absent 

3

maxillary caninae

B: short and stout

B: short and stout

C: long and slender (Fig.2:7-8)

B: short and stout

B: short and stout

B: short and stout

4

maxillary palp

B: nearly reaches apex of maxilla or a little longer, without incision

B: nearly reaches apex of maxilla or a little longer, without incision

T: much longer than maxilla, without incision (Fig.2:7)

L or B: various length, with  incision near apex (Fig.4:3) or without it

B: nearly reaches apex of maxilla or a little longer, without incision

B: nearly reaches apex of maxilla or a little longer, without incision

 5

paraglossae

B: 1.5Ц1.8 times wider than glossae

B or C

C: as wide as glossae (Fig.2:9-10)

L: 2.5Ц3 times wider than glossae (Fig.4:1-2)

B: 1.5Ц1.8 times wider than glossae

B: 1.5Ц1.8 times wider than glossae

6

setae on apex of paraglossae

B: several rows

B or C

C: two rows (Fig.2:9-10)

B: several rows (Fig.4:1-2)

B: several rows

B: several rows

7

longitudinal row of setae on ventral side of paraglossae

B: absent

B (absent) or C (present: Kluge 1983: Fig.66-67)

B: absent

B: absent

B: absent

B: absent

8

labial papl

B: apex conic or rounded;  apico-median projection of 2nd segment distinct but moderate (Müller-Liebenau 1973: Fig.6a,b)

B or C

C: apex obliquely truncate (Fig.2:9-10; Müller-Liebenau 1973: Fig.6d)

L: apico-median projection of 2nd segment very large (Fig.4:7)

A: widely rounded, length of 3rd segment subequal to length of 2nd segment; projection of 2nd segment small (Kazlauskas 1963: Fig.34, 40)

BL: 2nd segment elongate, without projection or with very small projection (Kazlauskas 1963: Fig.29)

9

face between antennae bases

B: flat (Fig.1:13,15)

N: with longitudinal keel (Fig.1:14,16)

see comment

N: with longitudinal keel (Fig.2:13-14)

N (Fig.4:17) or

B: flat

B: flat

10

scapus of antenna

B: without projection

B: without projection

B: without projection

L (with projection: Fig.4:17) or B (without projection)

B: without projection

B: without projection

11

outer-dorsal side of tibia

B: without dense row of long setae

B: without dense row of long setae

B: without dense row of long setae

B: without dense row of long setae (Fig.4:14)

A: with regular dense row of long setae (Müller-Liebenau 1973: Fig.10c)

BL: with longitudinal stripe of densely and irregulary arranged  fine setae (Fig.3:7)

12

claw

B: with 1 row of denticles

B: with 1 row of denticles (Müller-Liebenau 1973: Fig.10d)

C: without denticles (Fig.2:18)

B: with 1 row of denticles

B: with 1 row of denticles

B: with 1 row of denticles

13

abdomen

B: slender, terga only slightly wider than sterna, anterior terga with ratio length/width more than 1:4 (Müller-Liebenau 1973: Fig.17-20)

B: slender, terga only slightly wider than sterna, anterior terga with ratio length/width more than 1:4 

B: slender, terga only slightly wider than sterna, anterior terga with ratio length/width more than 1:4

B: slender, terga only slightly wider than sterna, anterior terga with ratio length/width more than 1:4 (Fig.4:6

A: wide, flattened ventrally and shortened, terga about 1.5 times wider than sterna, anterior terga with ratio length/width less than 1:4 (Müller-Liebenau 1973: Fig.15-16)

A: wide, flattened ventrally and shortened, terga about 1.5 times wider than sterna, anterior terga with ratio length/width less than 1:4 

14

number of caudalii

3 or 2

3

3

3

2 or 3

2

15

buds of subimaginal gonostyli under cuticle of mature larva

B: directed by apices medially (Fig.1:12)

N: second segment bent by convexity medially (Fig.1:11) or all segment directed caudally

N: second segment bent by convexity medially or all segment directed caudally (Fig.1:9)

B: directed by apices medially

B: directed by apices medially

B: directed by apices medially

 

imago:

Baetis_s.str.

Nigrobaetis

Takobia

Labiobaetis

Acentrella

Baetiella

16

face fold in lateral view

B: straight (Fig.1:17)

N: blunt-angled (Fig.1:18-19)

N: blunt-angled (Fig.1:2)

N or B

B: straight

B: straight

17

hind margin of head of female imago

B: with median cleft (in subimago convex) [see Novikova & Kluge 1994!]

B

T: convex, without cleft (Fig.1:1) [see Novikova & Kluge 1994!]

B

B

B

18

hind wing

present

present

present

present or absent

present or absent

absent

19

costal projection of hind wing

present

present

present

present or absent

absent

Ч

Comment to the character 9. In the original publication, there is written that among Nigrobaetis, face is flat in Neotropical species only. Under Neotropical species, we understood species recently placed to Fallceon and Caribaetis, which were known to us as larvae from Cuba; frons of Fallceon has longitudinal keel, while frons of Caribaetis is flat. At that time these taxa had not been described, imagoes were not associated with larvae, and we regarded them to be representatives of Nigrobaetis. Later I reared imagoes from larvae and separated Fallceon and Caribaetis from Nigrobaetis, based on shape of hind wing (Kluge 1992:13-20 and Kluge 1992:13-20). According to the recent classification, Nigrobaetis does not occur in Neotropics, and all its species have frontal keel.

* * *

At the same year there were issued two papers by Waltz & McCafferty, where they added one more important character Ц presence of villopore on larval femur: in Baetis s.str., Baetiella and Acentrella it is always present, in Nigrobaetis (= Diphetor) it is always absent; in Labiobaetis villopore is either absent, or poorly expressed (see characteristics of Baetifemorata).

Waltz R.D. & McCafferty W.P. 1987:667-670. New genera of Baetidae for some Nearctic species previously included in Baetis Leach (Ephemeroptera). // Annals of the Entomological Society of America 80 (5): 667Ц670.

Waltz R.D. & McCafferty W.P. 1987:553-568. Systematics of Pseudocloeon, Acentrella, Baetiella, and Liebebiella, new genus (Ephemeroptera: Baetidae). // Journal of the New York Entomological Society 95 (4): 553-568.