Allocapnia FORBESI
Creators: name: Stark, Bill P.
name: Kondratieff, Boris C.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Capniidae
Allocapnia

description: <i>ALLOCAPNIA FORBESI</i> GROUP Ross &amp; Ricker (1971) recognized six species (<i>A. curiosa</i> Frison 1942; <i>A. forbesi</i> Frison 1929; <i>A. maria</i> Hanson 1942; <i>A. minima</i> (Newport 1851); <i>A. ozarkana</i> Ross 1964; <i>A. pechumani</i> Ross &amp; Ricker 1964); <i>A. minima</i> was included, perhaps tentatively, and <i>A. frumi</i> Kirchner 1982 was subsequently added. All species in this group, except <i>A. minima,</i> share a short, ornately sculpted apical segment of the upper epiproct (e.g. Figs. 2-3, 32-33), and also have similar dorsal processes on abdominal terga 7 and 8 (e.g. Figs. 5-6, 17-18). We have not studied details of the female genitalia, but the figures in Ross &amp; Ricker (1971) indicate <i>A. minima</i> and <i>A. maria</i> have similar subgenital plates which differ from the other species placed in the group. On the basis of the lack of shared male characters, we are removing <i>A. minima</i> from this group and placing it in the <i>Allocapnia minima</i> group. Ross &amp; Ricker (1971) also suggest <i>A. illinoensis</i> Frison 1935, is descended from a common ancestor (#11) with members of the <i>A. forbesi</i> group. Presently, we have no supporting data for this hypothesis. Ross &amp; Ricker’s (1971) phylogenetic analysis of the <i>A. forbesi</i> group places it close to the <i>A. rickeri</i> group. This hypothesis is supported by the shared apomorphic feature of a short apical segment of the upper epiproct limb (Figs. 2, 98). The <i>A. pygmaea</i> group species have a longer apical segment (Figs. 43- 44), but all three groups share the same wave-like spiked armature on the apical segment (Figs. 2, 44, 98). Within the <i>A. forbesi</i> group, Ross &amp; Ricker suggested <i>A. forbesi</i> and <i>A. ozarkana</i> form a sister group, and <i>A. pechumani</i> and <i>A. maria</i> form another sister group closely related to <i>A. curiosa</i>. Our data show <i>A. curiosa, A. frumi, A. maria</i> and <i>A. pechumani</i> share the presence of ear-like expansions on the base of the apical segment of the epiproct upper limb (Figs. 2, 14, 20, 32), whereas the apical segment of this structure in <i>A. forbesi</i> and <i>A. ozarkana</i> is slender and not modified with ear-like basal lobes (Figs. 9, 26). The latter two species share a deeply notched 8 th tergal process not found among other species in this group (Figs. 11, 28). These characters support the Ross &amp; Ricker (1971) hypothesis of a sister group relationship between <i>A. forbesi</i> and <i>A. ozarkana</i>. Furthermore, we are able to place <i>A. frumi</i> as the probable sister species of <i>A. curiosa,</i> as suggested by Kirchner (1982). The basis for this assignment is the shared, thin lateral aspect of the elevated portion of the 8 th tergal process (Figs. 4, 15).
description: Published as part of <i>Stark, Bill P. &amp; Kondratieff, Boris C., 2012, Epiproct And Dorsal Process Structure In The Allocapnia Forbesi Frison, A. Pygmaea (Burmeister), And A. Rickeri Frison Species Groups (Plecoptera: Capniidae), And Inclusion Of A. Minima (Newport) In A New Species Group, pp. 45-77 in Illiesia 8 (5)</i> on pages 46-47, DOI: 10.5281/zenodo.4760725
description: {"references": ["Ross, H. H. &amp; W. E. Ricker. 1971. The classification, evolution, and dispersal of the winter stonefly genus Allocapnia. Illinois Biological Monographs 45: University of Illinois Press, Urbana, Illinois. 166 pp.", "Frison, T. H. 1942. Studies of North American Plecoptera with special reference to the fauna of Illinois. Bulletin of the Illinois Natural History Survey, 22: 235 - 355.", "Frison, T. H. 1929. Fall and winter stoneflies or Plecoptera of Illinois. Bulletin of the Illinois Natural History Survey, 18: 340 - 409.", "Hanson, J. F. 1942. Studies on the Plecoptera of North America. III. Allocapnia. Bulletin of the Brooklyn Entomological Society, 37: 81 - 88.", "Newport, G. 1851. On the anatomy and affinities of Pteronarcys regalis Newm.: with a postscript, containing descriptions of some American Perlidae, together with notes on their habits. Transactions of the Linnaean Society of London, 20: 447 - 452.", "Ross, H. H. 1964. New species of winter stoneflies of the genus Allocapnia (Plecoptera, Capniidae). Entomological News, 75: 169 - 177.", "Ross, H. H. &amp; W. E. Ricker, 1964. New species of winter stoneflies, genus Allocapnia (Plecoptera, Capniidae). Transactions of the Illinois Academy of Science, 57: 88 - 93.", "Kirchner, R. F. 1982. A new Allocapnia from West Virginia (Plecoptera: Capniidae). Proceedings of the Entomological Society of Washington, 84: 786 - 790.", "Frison, T. H. 1935. The stoneflies, or Plecoptera, of Illinois. Bulletin of the Illinois Natural History Survey, 22: 281 - 471."]}