Allocapnia aurora Ricker, 1952

Stark, Bill P. & Lacey, Joe W., 2005, Larvae Of The Winter Stonefly Genus Allocapnia (Plecoptera: Capniidae) In Mississippi, Usa, Illiesia 1 (3), pp. 10-20 : 11

publication ID

https://doi.org/ 10.5281/zenodo.4754442

DOI

https://doi.org/10.5281/zenodo.4757097

persistent identifier

https://treatment.plazi.org/id/03988630-A20E-FFE9-FEC2-F9415AD18A9F

treatment provided by

Felipe (2021-05-12 18:15:37, last updated 2024-11-27 13:43:35)

scientific name

Allocapnia aurora Ricker
status

 

Allocapnia aurora Ricker View in CoL

Allocapnia aurora Ricker (1952) View in CoL . Holotype ♂, Pigeon River, Woodrow , North Carolina

Distribution. AL, DC, GA, MD, MS, NC, PA, SC, TN, VA ( Stark 2001). Mississippi populations have

been reported from Amite, Franklin, Lauderdale and Tishomingo counties ( Alford 1998; Stark 1979). A new record is given for Clarke County.

Material examined. Mississippi: Clarke Co., Little Okatuppa Creek , Hwy. 18, 7 December 2002, 2 ♂, 22 larvae, B. Stark. Same location, 18 December 2002, 19 larvae, B. Stark, J. Lacey. Same location, 29 December 1999, 1♀, B. Stark. Same location, 18 January 2003, 1♂, 4 larvae, B. Stark, W. Hawkins, S. Cope. Same location, 8 January 2005, 1♂, B. Stark .

Male genitalia. Previously described from scanning electron micrographs by Alford (1998). Dorsal arm of epiproct bent near midlength, apical shape similar to a spear point; apex of dorsal limb engraved with a pattern of smooth, scalloped ridges ( Figs. 1-2 View Figs ). Dorsal process of tergum 8 deeply divided by a wide Ushaped notch; tergum 7 with an obscure mound shaped process near anterior margin.

Pre-emergent larva. Body length 6.0-7.5 mm. General body color pale brown to tan, without distinctive pattern. Mandibles, laciniae and labium ( Fig. 3 View Figs ) typical of genus; galea armed on apex with a few acute spines; outer margin of galea without fringe of long setae ( Fig. 4 View Figs ). Developing lobe of male tergum 10 distal to cercal bases more than twice as long as tergum length proximal to cercal bases ( Fig. 5 View Figs ); dorsal margin of developing male lobe straight but with slight subapical elevation; posterior margin slanted in lateral aspect. Abdominal terga sparsely covered with clothing hairs and decumbent bristles; erect bristles restricted to posterior tergal margins ( Fig. 6 View Figs ); longest erect bristles about 0.4 times as long as tergum.

Diagnosis. The presence of erect bristles only on the posterior margins of abdominal terga ( Fig. 6 View Figs ) will distinguish nymphs of this species from all those occurring in Mississippi except A. mystica . In that species the posterior margin of the developing male 10 th tergal lobe is truncate in lateral aspect rather than slanted ( Fig. 5 View Figs ).

Alford, M. H. 1998. New records of Allocapnia (Plecoptera: Capniidae) from Mississippi and Louisiana, with accompanying scanning electron micrographs. Entomological News, 109: 183 - 188.

Ricker, W. E. 1952. Systematic studies in Plecoptera.

Stark, B. P. 1979. The stoneflies (Plecoptera) of Mississippi. Journal of the Mississippi Academy of Sciences, 24: 109 - 122.

Stark, B. P. 2001. North American stonefly list, updated as of February 16, 2001. http: // www. mc. edu / campus / users / stark / sfly 0102. html.

Gallery Image

Figs. 1-6. Allocapnia aurora. 1. Male terminalia. 2. Apex of epiproct. 3. Ventral aspect of larval head. 4. Ventral aspect of left galea. 5. Lateral aspect of larval male 10th tergum and basal cercal segments. 6. Lateral aspect of abdominal terga 8-9. (Ep = epiproct, Ga = galea, Gl = glossa, Lp = labial palp, Mp = maxillary palp, Pg = paraglossa)

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Plecoptera

Family

Capniidae

Genus

Allocapnia