AscidaeKey to genera of the family Ascidae found on bees or their nests
adults
(modified from Halliday et al., 1998) |
| 1 | Fixed digit of chelicera with membranous pilus dentilis. Peritrematal shield at level of stigma usually less than twice as wide as diameter of stigma. On ventral opisthosoma, usually only anal shield with 3 circumanal setae present. Female epigynial shield usually rounded posteriorly |
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- | Fixed digit of chelicera with filiform pilus dentilis. Peritrematal shield at level of stigma at least twice as wide as diameter of stigma or shorter. Ventrianal shield usually present, with 2-7 pairs of ventral setae in addition to circumanal setae. Female epigynial shield usually truncate posteriorly |
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2(1) | Adults with 1-4 pairs of posterior marginal setae (R) on soft ventro-lateral cuticle, all others on edge of dorsal shield; female with 18-22 pairs of setae on opisthonotal region of dorsal shield; female usually with metasternal plates |
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- | Adults with 7-13 pairs of marginal (r-R) setae on soft lateral cuticle (rarely fewer if some r-R setae lacking); female with 14-15 pairs of setae on opisthonotal region of dorsal shield; female lacking metasternal plates ... |
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3(2) | Corniculi narrowly separated, usually slender; tectum convex, smooth; fixed digit of chelicera with few or no teeth; peritrematal shield slender, barely wider than stigma at level of stigma; female with humeral seta (r3) usually on soft cuticle beside dorsal shield |
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- | Corniculi well separated, stout; tectum convex, smooth or denticulate; fixed digit of chelicera usually with many teeth; peritrematal shield clearly wider than diameter of stigma at level of stigma; female with humeral setae on dorsal shield |
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