Taenionema
Creators: name: Stewart, Kenneth W.
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy

description: Provisional Key to Late Instar <i>Taenionema</i> Larvae This key is tentative, since (1) only single or few populations, and in some instances only small numbers, of larvae were correlated for study, and they display few distinctive external features with untested possible variation, and (2) a combination of characters of male and female 9 th sterna, the few diagnostic features of some species, and distribution is required for arriving at an identification. The combination of shapes of male-female 9 th sterna, that appear to be diagnostic for species, are difficult to express verbally, and are best recognized by comparing specimens with the figures of males (87-99) and females (100-112). 1 Distribution east of the 90 th Meridian; male 9 th sternum ovate, with rounded apex (Fig. 87) and female 9 th sternum narrower (Fig. 100)… ………………………………………..… <i>atlanticum</i> 1' Distribution west of the 100 th Meridian; male and female 9 th sterna variable ………………………... 2 2 Male wingpads brachypterous (Fig. 33), female wingpads macropterous (Fig. 34); male and female 9 th sterna both narrowly triangulate posteriorly (Figs. 99, 112) …………………… <i>uinta</i> 2' Male and female wingpads macropterous …… 3 3 Male and female 9 th sterna both narrowly triangulate posteriorly (Figs. 88, 92; 101, 105) … 4 3' Male 9 th sternum (Figs. 89-91, 93-98) wider in posterior half than female (Figs. 102-104, 106-111) ………………………………………………………. 5 4 Distribution: California ……………... <i>californicum</i> 4' Distribution: Oregon and Washington ….. <i>jewetti</i> 5 Galea with a dense patch of curved, comb-like teeth covering apical, outer surface (Fig. 26); male 9 th sternum ovate (Fig. 89); female 9 th sternum distinctly subtriangulate in posterior half, with posterolateral sides concave (Fig. 102); distribution California …………………… <i>grinelli</i> 5' Galea with less prominent comb-like teeth (Figs. 25, 27-32); male 9 th sternum variable in shape; posterolateral sides of female 9 th sternum straight or convex; distribution variable ………………... 6 6 Distribution Idaho and western Oregon; male 9 th sternum broadly rounded, nearly truncate, apically (Fig. 98); female 9 th sternum narrowly triangulate posteriorly (Fig. 111) ………. <i>umatilla</i> 6' Distribution variable …………………………… 7 7 Rare, small species, presently known only from few localities in Arizona and New Mexico; male 9 th sternum broadly rounded in apical half (Fig. 90); female 9 th sternum narrowly triangulate in apical half (Fig. 103); body length of both sexes 6- 7 mm …………………………………….….. <i>jacobii</i> 7' Distribution variable; body length of both sexes greater than 7mm ………………………………… 8 8 Distribution Pacific Northwest (Oregon, Washington); male 9 th sternum broadly triangulate in posterior half and apically pointed; female 9 th sternum narrowly triangulate in posterior half (Fig. 107) ………………. <i>oregonense</i> 8' Distribution California or widespread ………… 9 9 Distribution California ………………………… 10 9' Distribution widespread ………………………. 11 10 Male 9 th sternum ovate, with broadly rounded apex (Figs. 1C, 91); female 9 th sternum broadly triangulate in apical half, with narrowly rounded apex (Fig. l04) ………………………………. <i>jeanae</i> 10' Male 9 th sternum broadly triangulate in apical half (Fig. 97); female 9 th sternum narrowly triangulate in apical half (Fig. 110) ………………… <i>raynorium</i> 11 Male 9 th sternum ovate, with posterolateral sides angulate (Fig. 93); female 9 th sternum narrowly triangulate in posterior half (Fig. 106); distribution California, Pacific Northwest northward to Alaska and Yukon ………... <i>kincaidi</i> 11' Posterolateral sides of male 9 th sternum not angulate (Figs. 95, 96); widespread western North America …………………………………………. 12 12 Male 9 th sternum ovate, with narrowly rounded apex (Fig. 95); female 9 th sternum narrowly angulate, with posterolateral sides nearly straight, and a pointed apex (Fig. 108) …………. <i>pacificum</i> 12' Male 9 th sternum with broadly rounded apex (Fig. 96); female 9 th sternum ovate, with posterolateral sides convex, and a narrowly rounded apex (Fig. 109) ………………………………………... <i>pallidum</i>
description: Published as part of <i>Stewart, Kenneth W., 2009, New Descriptions Of North American Taenionema Larvae (Plecoptera: Taeniopterygidae), pp. 128-145 in Illiesia 5 (12)</i> on pages 135-136, DOI: 10.5281/zenodo.4759332