Tryonia Stimpson, 1865

Hershler, Robert, Liu, Hsiu-Ping & Landye, Jerry, 2011, New species and records of springsnails (Caenogastropoda: Cochliopidae: Tryonia) from the Chihuahuan Desert (Mexico and United States), an imperiled biodiversity hotspot, Zootaxa 3001, pp. 1-32 : 7

Genus Tryonia Stimpson, 1865

Type Species: Tryonia clathrata Stimpson, 1865 (by original designation). Diagnosis: (From Hershler 2001: 3)

The new species described below are referred to Tryonia on the basis of the insertion of the posterior vas deferens into the postero-dorsal edge of the prostate gland and details of female reproductive anatomy (young brooded in thin-walled albumen gland, bursa copulatrix and seminal receptacle present, sperm duct coiled and opening to bursal duct behind pallial wall; e.g., T. peregrina , described below, Fig. 3 ). They also closely conform to the genus in all other respects.

Figures

FIGURE 3. Tryonia peregrina sp. nov. A. Prostate gland (viewed from left side), USNM 1153677. B – C. Female brood pouch and associated structures (B, viewed from left side, embryos not shown; C, close-up of sperm pouches and associated ducts), USNM 1153677. Scale bars A = 250 µm, B – C = 500 µm. Ag = albumen gland, Avd = anterior section of vas deferens, Bp = brood pouch, Bu = bursa copulatrix, Cov = coiled oviduct, Pvd = posterior section of vas deferens, Pw = posterior wall of pallial cavity; Sdu, sperm duct; Sr, seminal receptacle; St, sperm tube.