Garrisonia, Penalva & M.Costa, 2007

Penalva, R. & M. Costa, J., 2007, Garrisonia aurindae gen. and spec. nov. from the State of Bahia, Brazil (Anisoptera: Libellulidae), Zootaxa 1453 (1), pp. 33-40 : 33-38

Garrisonia new genus

Type species by present designation. ― Garrisonia aurindae spec. nov.

Etymology. The new genus is named after our friend and Odonatologist Rosser W. Garrison, who first recognized these specimens as belonging to a new genus.

Diagnosis. Both sexes superficially resemble Tauriphila in general habitus but are at once separated primarily by the dimorphic condition of the meso- and metafemoral spines. The outer angle of mesofemur of the male has four stout spines, followed by a row of minute peg-like to obtusely pointed spines proximally ( Fig. 6a ) and the metafemur is similar but with six stout spines followed by a series of obtusely pointed spines proximally ( Figs. 6b, c ) (one large spine followed by a smaller row of spines proximally on both meso- and metafemur in Tauriphila , Fig. 7 ). In females, the mesofemur consists of six or seven large stout spines followed proximally by a decreasing series of smaller ones ( Fig. 8a ) and the metafemur is armed with nine to ten prominent spines followed by two three gradually smaller ones ( Fig. 8b ) (three to four large spines followed by row of graduating smaller row of spines proximally on mesofemur, Fig. 9a , and one large spine followed by a series of progressively smaller spines on metafemur in Tauriphila , Fig. 9b ); lateral carina on abdominal segment 2 roundly curved ( Fig. 4 ) (at right angles or with forward angle obsolete in Tauriphila , Fig. 5 ); and toe of anal loop relatively short, subequal to heel ( Fig. 1 ) (toe of anal loop distinctly longer than heel in Tauriphila , Figs. 2, 3 ). The pronounced femoral spination in Garrisonia is shared only with Erythemis Hagen.

Description. Libellulidae of medium size (total length: 44mm), head broad, frons prominent, broad, slightly notched medially and with reduced tubercle laterally, prothorax with posterior margin small, bent posteriorly; legs long and robust, outer angle of femur 2 of male dimorphic with four stout spines, followed by a row of minute peg-like to obtusely pointed spines proximally ( Fig. 6a ), metafemur as in 2 but with six stout spines followed by a series of obtusely pointed spines proximally ( Figs. 6b, c ); claws with well-developed supplementary tooth. Wings ( Fig. 1 ) long and pointed, similar to Tauriphila i. e., HW not much broader than FW; a small patch of brown across base of HW, pterostigma moderate; FW with 11 anx and 8 pnx, the last anx incomplete and the first two or three pnx not continuous, arculus between anx 1 and 2; FW triangle with one crossvein, discoidal field with three rows of cells increasing to four and terminating at wing margin with five rows, subtriangle with three cells,. Medial and radial planates present, of one row of cells or rarely with a two interpolated cells in radial planate; apical planate well developed, of two rows; HW with 7 anx and 10 pnx, the first two or three pnx not continuous, triangle free, followed by two rows of cells passing to three or four and finishing with nine rows; toe of anal loop relatively short, subequal to heel; HW with four well defined rows of cells in HW anal field. Abdomen triquetral, broader on segments 5–7 in dorsal and lateral views; segments 2–3 slowly constricted and transversely carinate, lateral carina or keel on segment two bent forward in a rounded curve ( Fig. 4 ); anterior lamina of male about 1.5 as long as wide. Cercus ( Fig. 10c, d ) of male in lateral view with dorsal margin slightly convex, nearly straight distally, not as long as segments 9 and 10 together. General coloration dark.

Figures

FIGURE 4–7. 4, 6. Garrisonia aurindae male, Figs. 5. Tauriphila australis male: (4, 5) abdominal segment 2, lateral view, (6, 7) femur 2, external view (a), femur 3, external view (b), femur 3 detail (c).

FIGURE 8–10. 8, 10. Garrisonia aurindae female and male, Fig. 9. Tauriphila australis female: (8, 9) femur 2, external view (a), femur 3, external view (b); (10): caudal appendages dorsal (a) and (b) lateral view; secondary genitalia, lateral (a) and (b) ventral view.

FIGURE 1–3. 1. Garrisonia aurindae male, Fig. 2, 7. Tauriphila argo, Fig. 3. Tauriphila risi: (1–3) wings.