为什么没放上英文名，是tarantula吗。
如果是，这是个大类总称，有900多个品种呢，有不织网的，有织网的。
google来的一个解释do tarantulas spin webs?
Many spiders spin webs that serve as homes and traps for prey. These webs are spun from silk thread produced from spinnerets. Tarantulas are also capable of producing silk and can use it for similar purposes, depending on species. Many of the arboreal tarantulas make silken homes in tree holes or other crevices. Even the burrowing terrestrial species use silk to line their burrows, and some use silk to create door-like entrances to their burrows.
的确大多数穴居tarantulas是不结网捕食的，孩子知道的很多，也有质疑思考精神很棒。
Although they do have silk-producing capabilities, most tarantulas do not weave aerial webs to trap their prey. Rather, they utilize ambush strategies or hunt for food at night. Depending on the species, most tarantulas hide within their burrows to ambush prey as it walks by or may wander nearby to the burrow looking for a meal. Tarantulas move quickly for short bursts and inject their prey with venom in order to paralyze it
tarantula的话，wiki对这个的词源解释得很清楚的：
The spider originally bearing the name "tarantula" was Lycosa tarantula, a species of wolf spider native to Mediterranean Europe.[1] The name derived from that of the southern Italian town of Taranto. The term "tarantula" subsequently was applied to almost any large, unfamiliar species of ground-dwelling spider, in particular to the Mygalomorphae and especially to the new-world Theraphosidae. Compared to tarantulas, wolf spiders are not particularly large or hairy, so among English speakers in particular, the usage eventually shifted in favour of the Theraphosidae, even though they are barely related to the wolf spiders, being in a different infraorder.
New-world and other divergent usages
When theraphosids were encountered in the Americas, they were named "tarantulas", causing usage of the term to shift to the tropical spiders. Nevertheless, these spiders belong to the suborder Mygalomorphae, and are not closely related to wolf spiders.
The name "tarantula" is also mistakenly applied to other large-bodied spiders, including the purseweb spiders or atypical tarantulas, the funnel-webs (Dipluridae and Hexathelidae), and the "dwarf tarantulas". These spiders are related to tarantulas (all being mygalomorphs), but are classified in different families. Huntsman spiders of the family Sparassidae have also been termed "tarantulas" because of their large size. In fact, they are not related, belonging to the suborder Araneomorphae.
^^^^^^^^^^
turnup于2014-4-24 10:17补充以下内容：
厉害，都学到这么高级别了。