Two types of spiders found in southern Taiwan’s Hengchun Peninsula have been identified as new species after years of analysis and cross-checking, the Taiwan Biodiversity Research Institute said on Thursday.
The new species are Idioctis parilarilao, also known as the parilarilao trapdoor spider, and Hogna arborea, or the Taiwanese tree-dwelling wolf spider, the institute said in a statement.
The discoveries came after years of effort by a research team consisting of personnel from the institute, National Taiwan Normal University, National Chung Hsing University and international experts, the institute said.
Photo courtesy of Lo Ying-yuan via CNA
It did not specify when the spiders were first found, but said it took years of collecting specimens, reviewing published studies and DNA time series analyses, and comparing foreign samples to confirm the Parilarilao trapdoor spiders as a new species.
Ultimately, researchers determined that parilarilao trapdoor spiders belong to the family Barychelidae, and that Taiwan is the northernmost habitat of spiders in this family.
Parilarilao trapdoor spiders build nests with trap doors and live in intertidal zones, meaning they are underwater at high tide but exposed during low tide, the institute said.
Their nests are closed by watertight trap doors to ensure that there is enough air and their homes are not flooded or washed away at high tide, and the spiders slightly open the trap doors at low tide and attack prey that go past their nests.
The new species was named after the indigenous name for the area, with parilarilao meaning “living at the end of Taiwan” in the Paiwan language, the institute said.
The other species, Hogna arborea, was determined to belong to the family Lycosidae, and according to the institute, wolf spiders in this family often dwell in grasslands, farmland or meadows.
Researchers found wolf spiders living in treeholes in recent years in several areas of eastern and southern Taiwan, including Hengchun in the south and Yilan and Hualien counties in the east, and that these spiders were later confirmed to be a new species, the institute said.
The new species was named Hogna arborea, with hogna meaning “wolf spider” and arborea meaning “living on trees,” the institute said.
According to the institute, Taiwanese tree-dwelling wolf spiders have a body size of more than 2cm and are considered large compared with most Taiwanese wolf spiders.
Taiwan has more than 20 wolf spider species, the institute said.
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