Beneath the surface: A new northern species of Trogloraptor (Araneae: Trogloraptoridae), genetic diversity and natural history

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  Beneath the surface: A new northern species of Trogloraptor (Araneae: Trogloraptoridae), genetic diversity and natural history Abstract We present a morphological description of a recently discovered species of spider in the family Trogloraptoridae from the Columbia River Gorge in northwestern Oregon. The family was previously monotypic (Trogloraptor marchingtoni) and only known from populations near the southwestern Oregon—northern California border. Trogloraptor tulishpun sp. nov. retains the key family synapomorphy, distinctive subsegmented raptorial tarsi, and an oblique membranous division of the basal segment of the anterior lateral spinnerets. Trogloraptor tulishpun is distinguished from T. marchingtoni by its color pattern, clypeal height, vulvar and palp structure. We have found T. tulishpun in four localities in the Columbia River Gorge, which show little mitochondrial sequence divergence from one another, but are highly genetically distinct from T. marchingtoni. Troglo...

Microhabitat Preference of Coremiocnemis cunicularia and Chilobrachys andersoni in Pulau Pinang, Malaysia

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Microhabitat Preference of Coremiocnemis cunicularia and Chilobrachys andersoni in Pulau Pinang, Malaysia

ABSTRACT 

The Theraphosidae, commonly known as tarantulas, is one of the families under the infraorder of Mygalomorphae. Untill today, information regarding the ecology of Theraphosidae in Pulau Pinang, Malaysia, has been lacking, particularly concerning their ecology and natural history. This study aimed to investigate and compare the microhabitat parameters of Chilobrachys andersoni and Coremiocnemis cunciularia in Pulau Pinang across six sampling sites from May 2022 to September 2022. Thirteen different microhabitat parameters related to the burrows of the Theraphosidae were examined to examine if the two tarantula species have specific microhabitat preference. The collected parameters data were analyzed using the chi-square test and T-test. The variations and similarities of the microhabitat parameters of Coremiocnemis cunicularia and Chilobrachys andersoni were illustrated using principal component analysis (PCA) and non-metric multi-dimensional scaling (nm-MDS). It was shown that the type of trail near to the burrow, the height and diameter of the door entrance, soil and surrounding temperature, the distance of the burrow from the trail, plant species richness, and altitude difference between the burrows of Coremiocnemis cunicularia and Chilobrachys andersoni were statistically significant. PCA and nm-MDS analyses demonstrated that the habitat preferences of these two Theraphosidae species differed. In conclusion, this study contributed significant ecological knowledge regarding Theraphosidae, particularly on Pulau Pinang, Malaysia. Further studies on various aspects of Theraphosidae are important for improved conservation management in the future.

Razak, I., Shukor, M., Nasir, D. M., Wahab, A. Z., Hian, C. M., & Ahmad, A. (2026).
Microhabitat preference of Coremiocnemis cunicularia and Chilobrachys andersoni in Pulau Pinang, Malaysia. Sains Malaysiana, 55(3), 363–374. https://doi.org/10.17576/jsm-2026-5503-01