Apostenus ducati Bennett, Copley & Copley, 2013
- GBIF Backbone Taxonomy
- Apostenus ducati
Diagnosis. Specimens of Apostenus are distinguished from all other spiders by the combined presence of distinctive multiple pairs of overlapping elongate macrosetae lateroventrally on the tibiae and metatarsi of legs I and II (Figs. 1, 2) and, at the tip of each leg, of two tarsal claws each with an adjacent single flattened tenent macroseta (Figs. 10, 11; Ubick & Vetter 2005, fig. 8). Although these characters are sufficient to distinguish Apostenus, further characters for the separation of the genus from other liocranids were presented by Bosselaers (2009). Sexual and somatic characteristics separate A. ducati from A. californicus, the only other species of Apostenus known from the Nearctic region. The posterior portion of the median epigynal lobe (median septum of Bosselaers & Jocqué (2002) and Bosselaers (2009 )) in female A. ducati is broadly triangular and extends posteriorly almost to the epigastric groove (Figs. 7, 12). In A. californicus the median epigynal lobe is broadly truncate posteriorly and does not extend to the epigastric groove (Ubick & Vetter 2005, fig. 25). In male A. ducati the embolus is a simple short curved spur (Figs. 4 – 6) and the sickle-shaped median apophysis is elongate and thin (Figs. 4, 5). In A. californicus the embolus is also short and curved but is relatively more complex with a grooved surface ventrally and angular modifications proximally and distally (Ubick & Vetter 2005, figs. 22 – 24, 28, 30) and the sickle-shaped median apophysis is relatively shorter and thicker (Ubick & Vetter 2005, figs. 23, 28). In addition, in A. californicus all tarsi are subsegmented and tarsus I possesses a lateroventral row of paired spatulate setae (Ubick & Vetter 2005, figs. 3, 4). In A. ducati tarsi are subsegmented only on legs III and IV, and tarsus I also possesses a lateroventral row of paired setae, although these are not spatulate but resemble diminutive versions of the paired lateroventral macrosetae characteristic of tibiae and metatarsi I and II. Finally, specimens of A. californicus are relatively dark-coloured and have banded legs; those of A. ducati are relatively pale with unbanded legs.
Etymology. The species name is a patronym (genitive, masculine) honouring the Ducati motorcycle marque and refers to the characteristic speed, sprightliness, and maneuverability with which specimens of A. ducati evade pursuit. We have found them to be very difficult to capture, even in cool weather, perhaps explaining in part why this species has not been recorded previously.
- Bennett, R., Copley, C., Copley, D. (2013) <i>Apostenus ducati</i> (Araneae: Liocranidae) sp. nov.: a second Nearctic species in the genus: Zootaxa 3647: 63-74