Allocapnia Claassen, 1928

Nations, Tina M., Stark, Bill P. & Hicks, Matthew B., 2007, The Winter Stoneflies (Plecoptera: Capniidae) Of Mississippi, Illiesia 3 (9), pp. 70-94 : 72-73

publication ID

https://doi.org/10.5281/zenodo.4759885

DOI

https://doi.org/10.5281/zenodo.4759758

persistent identifier

https://treatment.plazi.org/id/038D879B-FF8B-6843-FEEC-816AFAC8FDEF

treatment provided by

Felipe

scientific name

Allocapnia Claassen, 1928
status

 

Genus Allocapnia Claassen, 1928

Type species. Allocapnia granulata (Claassen)

Distribution. An eastern Nearctic endemic genus found from the southern Maritime Provinces of Canada to the Gulf Coastal States and westward to the Wichita Mountains of Oklahoma and the eastern countiesof the Dakotas (Kirchner et al. unpublished). Diversity. Allocapnia currently includes 44 species ( Stark & Baumann 2006) with seven recognized for Mississippi. The following keys modified from Kirchner et al. (unpublished) will assist in the identification of adult specimens. Most Mississippi nymphal specimens can be identified using Stark & Lacey (2005).

Key to Adult Mississippi Allocapnia

(Modified from Kirchner et al. unpublished)

1 Tip of abdomen bearinga dorsalepiproct (Figs. 4‐ 5), and a dorsal process on abdominal segment 8 (Fig. 7); wings not reaching tip of abdomen ……………………………………………… males (2)

1’ Tip of abdomen without dorsal epiproct and process on tergum 8, butwith a conspicuous pale, unsclerotized dorsal band extending from abdominalbase to segment 8; abdominalsternum 8 modified to form a small subgenital plate (Fig. 9); wings usually reaching almost to, or slightly beyond tip of abdomen …………….... females (8)

2 Tergal process on segment 8 with a wide, conspicuous notch ( Fig. 14 View Figs ) ……………………... 3

2’ Tergal process on segment 8 without notch ( Fig. 28 View Figs ), or with a narrow inconspicuous notch ( Fig. 21 View Figs ) ………………………………………………… 5

3 Tergum 8 with a small membranous, hairy knob located posterolaterad of each lobe of dorsal process ( Figs. 12‐14 View Figs ) …………………… granulata

3’ Tergum 8 without membranous hairy knob behind lobes of dorsal process …………………. 4

4 Dorsal process of tergum 8 more or less chair shaped in lateral aspect; notch moderately deep but not extending to level of tergum 7 (Figs. 5, 7) ………………………………………………… aurora

4’ Dorsal process of tergum 8 not chair shaped in lateral aspect; notch of process deep, extending to levelof tergum 7 ( Fig. 33, 36 View Figs ) ……………… rickeri

5 Dorsalprocessof tergum 8 large, flat, cushion‐ like and bearinga second, small, ridge‐ like processon anterior margin of tergum 8 ( Figs. 49‐50 View Figs ; apical segment of epiproct upper limb wide ( Fig. 46 View Figs ) ………….…………………………….… virginiana

5’ Dorsal process of tergum 8 variable but not as above; apical segment of epiproct upper limb narrower ( Fig. 18 View Figs ) ……………………………….. 6

6 Dorsal process of tergum 8 with a narrow notch ( Fig. 21 View Figs ) ……………………….…………… mystica

6’ Dorsalprocessof tergum 8 withoutnotch ( Fig. 28 View Figs ) ……………………………………………………... 7

7 Anterior margin of dorsal process of tergum 8 bent abruptly near apex in lateral aspect ( Fig. 29 View Figs ); dorsal aspect of 8 th tergal process a thin, almost straight, transverse ridge ( Fig. 28 View Figs ) ……. polemistis

7’ Anterior margin of dorsalprocessof tergum 8 not bent ( Fig. 43 View Figs ); dorsal aspect of 8 th tergal process U or V‐ shaped ………………………………….. starki

8 Abdominal sterna 7 and 8 at least partially fused by a distinct transverse sclerotized area (Figs. 9, 37) …………………………………………………. 9

8’ Abdominal sterna 7 and 8 separated by membrane ( Fig. 16 View Figs ) …………………………….. 10

9 Sclerotized bridge between abdominal sterna 7 and 8 with conspicuous lateral membranous notches ( Figs. 37 View Figs , 63 View Figs ) ………………………. rickeri

9’ Sclerotized bridge between abdominal sterna 7 and 8 folded under posterior margin of sternum 7 forming a thin, dark line without lateral notches (Figs. 9, 59) ………………………………….. aurora

10 Projectingsubgenitalplatewithsmallbasolateral notches ( Figs. 16 View Figs , 60 View Figs ) …..……………..… granulata

10’ Subgenital plate, if projecting, without basolateral notches ( Fig. 30 View Figs ) ……………………………….… 11

11 Subgenital platescarcely projecting beyondlateral margins of sternum 8 ( Figs. 30 View Figs , 62 View Figs ); known from Tishomingo Co ………………….……… polemistis

11’ Subgenital plate at least slightly projecting beyond lateral margins of sternum 8 ( Fig. 44 View Figs ); found more or less statewide ………………….. 12

12 Subgenital plate broadly arcuate ( Figs. 51 View Figs , 65 View Figs ) ……………………….…………………… virginiana

12’ Subgenital platenarrow ( Fig. 44 View Figs ) ………….…... 13

13 Base of subgenital plate with a pair of small, mesal lobes ( Fig. 64 View Figs ) ..………………….……. starki

13’ Base of subgenital plate without small, mesal lobes ( Fig. 61 View Figs ) ……………………….……… mystica

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Plecoptera

Family

Capniidae