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Siricidae (Hymenoptera: Symphyta: Siricoidea) of the Western Hemisphere
CJAI 21, July, 2012
doi: 10.3752/cjai.2012.21
Nathan M. Schiff, Henri Goulet, David R. Smith, Caroline Boudreault, A. Dan Wilson, and Brian E. Scheffler

Genus Teredon Norton

Fig. C34.1 (female habitus)

Teredon Norton, 1869: 366. Type species: Tremex cubensis Cresson, designated by Rohwer (1911).
Teredonia Kirby, 1882: 386. Unnecessary new name for Teredon Norton. According to Kirby, Teredon is preoccupied, “nom praeocc.”. We did not find the name Teredon to be preoccupied. However, Linnaeus (1758: 651) described the genus Teredo, a bivalve, which is not a homonym because of one letter difference (Konow 1905a).

Diagnostic Combination

Both sexes of Teredon are recognized by the strongly compressed metatarsomere 1 and fewer than 9 flagellomeres.


Head. Antennal sockets with distance between their inner edges of sockets 7–8 times distance between inner edge of eye and outer edge of socket (Fig. B1.14). Distance between edges of posterior ocelli in female, 1.4 and in male, 1.9 times as long as distance between outer edge of lateral ocellus and nearest edge of eye (Figs. B1.14 & C34.2). Maximum distance between outer edges of eyes in female, clearly, and in male slightly less than maximum width of head (thus, in frontal view, genal edges completely visible and not intersected by outer edges of eyes) (Figs. B1.14 & C34.2). Minimum distance between inner edges of eyes about 0.95 times as long as maximum eye height (Fig. B1.14). Gena without ridge behind eye and without white spot (Fig. C34.3), with large pits near antennal groove, each with posterior edge raised posteriorly as a low tooth. Head with setae sharp at apex. Eye in female, 2.2 and in male, 1.6 times as high as long (Figs. C34.4 & C34.3). Antenna in female with 7 or 8, and in male with 4 antennomeres (Figs. C34.4 & C34.3), and middle antennomere in dorsal view, in female 1.1–1.2 and in male 3.0 times as long as wide in dorsal view; pitted sensors restricted to ventral surface and sharply separated from dorsal surface by sharp fold on both sides.

Thorax. Pronotum pitted only in dorsal third of anterior vertical surface. Mesoscutum entirely densely pitted. Metatibia in female quite typical in lateral view (Fig. B1.18), but in male markedly compressed laterally and enlarged in apical 0.3 (Fig. C1.8). Metatarsomere 1 (including lobe) in both sexes 1.1–1.2 times as long as maximum length of metatibia; enlarged in female 1.5 times (Fig. B1.18) and in male 1.3 times as wide as maximum width of metatibia (Fig. C1.8). Metatarsomere 2 in lateral view about as long as high. Metatarsomere 5 as long as metatarsomeres 2-4 (Figs. B1.18 & C1.8). Fore wing with apex acutely and angularly rounded, with vein 2r–m joined–cell 2M (as in Fig. B1.71), with vein 2 r–m present, with cell 1Rs2 clearly wider than long, with cell 2R1 about 0.7 times as long as cell 3R1, with vein 2r-rs joining stigma near middle, with stigma gradually attenuated even distal to junction with vein 2r-rs (as in Fig. B1.25), without vein Cu1, with vein 1cu–a joining vein Cu about midway between veins 1m–cu and M, with vein SC present in basal 0.3 (difficult to see), with vein 2A extending along posterior edge of wing for 0.4 times cell 1A length, and with vein 3A very clearly extending along posterior wing margin (Fig. C34.5). Hind wing in female without anal cell and in male with anal cell; hamuli present equally basal and apical to junction of veins R1 and C.

Abdomen. Female. Cornus in dorsal view with median length 0.5 times as long as median basin length, lateral edges of cornus markedly convergent and not constricted (Fig. B1.22). Terga 7–9 (except side, but including median basin) not deeply and densely pitted (Fig. B1.22). Tergum 9 with median basin not pitted, with surface concave, about as long as wide, and with lateral edges round and clearly outlined for 0.75 of length of cornus (Fig. B1.22). Cercus present but very small. Sheath. Basal and apical sections fused but a small constriction between them still present; basal section more than 2.7 times as long as apical section, and apical section of sheath without teeth dorsomedially (Fig. B1.20); with basal section of median margin at very base without transverse ridges, and each setigerous pit clearly raised as a ventrally directed tooth (Fig. C34.6). Ovipositor. Lancet with 18 annuli, all clearly outlined to its base; posterior edge of annuli 6–14 with a prominent dorsal and ventral tooth fusing into one tooth on annulus 5; edge of annuli 7–14 markedly sinuate; pit developed in sinuation and surface of annulus deeply impressed anterior to pit, forming a longitudinal furrow between annuli 7–14 (Fig. C34.7); edge ventral to sinuation developed ventrally as a sharp and long tooth and dorsally as a low round tooth (Fig. C34.7).

Diversity and Distribution

Smith (1978), Taeger and Blank (2011) and Taeger et al. (2010) list two species of Teredon. Unfortunately, the two holotypes represent the two sexes. As expected, the male is strikingly different from the female. Therefore, we uphold Konow’s (1898) synonymy and treat the two sexes as belonging to one species. Adults are the most modified Siricidae studied.

Species List

One species treated: