Nyctimus quadripunctatus Dhiya’ulhaq & Benjamin, 2025

Benjamin, Suresh P., Dhiya’ulhaq, Naufal Urfi, Deeleman-Reinhold, Christa, Buchori, Damayanti, Hidayat, Purnama, Scheu, Stefan & Drescher, Jochen, 2025, Taxonomic notes on the crab-spider genera Nyctimus Thorell, 1877 and Zametopina Simon, 1909 (Araneae, Thomisidae) with descriptions of six new species from Southeast Asia, ZooKeys 1255, pp. 95-125 : 95-125

publication ID	https://doi.org/10.3897/zookeys.1255.158380
publication LSID	lsid:zoobank.org:pub:584332C1-8B4B-41B9-A17D-327F47B5616A
DOI	https://doi.org/10.5281/zenodo.17307022
persistent identifier	https://treatment.plazi.org/id/14EA4F9E-30F1-5BC0-907E-E5D2595607ED
treatment provided by	ZooKeys by Pensoft
scientific name	Nyctimus quadripunctatus Dhiya’ulhaq & Benjamin
status	sp. nov.

Treatment

Nyctimus quadripunctatus Dhiya’ulhaq & Benjamin sp. nov.

Figs 9 View Figure 9 , 10 View Figure 10 , 11 View Figure 11 , 12 View Figure 12

Etymology.

The specific epithet is taken from Latin, referring to the four white spots on the opisthosoma.

Type material.

Holotype. Indonesia – Sumatra, Jambi Province • ♂; Batang Hari, Hutan Harapan Conservation Area ; 02°11'15.3"S, 103°20'36.0"E; elev. 69 m; 7 Aug. 2013; J. Drescher leg.; canopy fogging in rainforest; GOET 2013_HF 4.2_AraThom 001 N_001 (to be transferred to MZB) GoogleMaps . Paratypes. Indonesia – Sumatra, Jambi Province • 1 ♂ 1 ♀; Batang Hari, Hutan Harapan Conservation Area ; 02°10'42.4"S, 103°19'58.2"E; elev. 54 m; 21 Jul. 2013; J. Drescher leg.; canopy fogging in rainforest; GOET 2013_HF 3.2_AraThom 001 N_001–2 (to be transferred to MZB) GoogleMaps • Malaysia – Sabah State • 1 ♂; Kinabalu National Park, Poring Hot Springs ; 05°59'N, 116°42'E; elev. 600–700 m; 28 Mar. 1998; A. Floren leg.; canopy fogging on Barringtonia tree, in primary forest; RMNH RMNH.ARA.17858 GoogleMaps . • 1 ♂; Kota Marudu, Kampong Sorinsim ; 06°06'N, 116°50'E; elev. 600–700 m; 2 Mar. 1997; A. Floren leg.; canopy fogging in 15 years old secondary forest; RMNH RMNH.ARA.17860 GoogleMaps .

Other material examined.

Malaysia – Sabah State • 1 ♂; Kinabalu National Park, Poring Hot Springs ; 05°59'N, 116°42'E; elev. 600–700 m; 27 Feb. 1996; A. Floren leg.; canopy fogging on Aporosa subcaudata tree, in primary forest; RMNH RMNH.ARA.17857 GoogleMaps .

Diagnosis.

Males are easily distinguished from other congeners by the anvil-shaped RTA ending in two acute lobes (Fig. 11 A, B View Figure 11 ). Females can be distinguished from N. bistriatus by the much thinner, shorter CD and paired CO (Figs 10 C, D View Figure 10 , 11 C, D View Figure 11 ; vs single CO in N. bistriatus , Figs 2 C View Figure 2 , 3 C View Figure 3 ), and from N. rendang , sp. nov., by the spermatheca lacking a prominent posterior extension (Figs 10 D View Figure 10 , 11 D View Figure 11 ; vs Figs 14 D View Figure 14 , 15 D View Figure 15 ).

Description.

Male ( holotype 2013 _ HF 4.2 _ AraThom 001 N _ 001; Figs 9 View Figure 9 , 11 A, B View Figure 11 ). Total length 2.95. Prosoma length 1.35; width 1.23. Opisthosoma length 1.60; width 1.22. Diameter of eyes: AME 0.07; ALE 0.16; PLE 0.16; PME 0.06. Interdistances between eyes: AME – AME 0.38; AME – ALE 0.08; ALE – ALE 0.68; PME – PME 0.34; PME – PLE 0.32; ALE – PLE 0.19; AME – PME 0.18; PLE – PLE 0.98. Clypeus height 0.00. Leg measurements: leg I 4.25 (1.19, 0.49, 1.06, 0.90, 0.61); leg II 3.89 (1.11, 0.42, 0.90, 0.81, 0.65); leg III 2.63 (0.86, 0.35, 0.57, 0.49, 0.36); leg IV 2.74 (0.83, 0.27, 0.66, 0.52, 0.46). Prosoma cuboid, almost as long as wide, box-shaped, weakly granulated, highest at mid-point, light brown; lateral margins furnished with a row of long macrosetae. Lateral eyes large, situated on tubercles on the lateral edge of the prosoma. Chelicerae, endites, and labium light brown. Sternum light brown. Legs I light brown; others yellow-brown, with sparse spines and black setae. Opisthosoma oval, brown, with two pairs of large white spots. Spinnerets brown.

Palp (Figs 9 C, D View Figure 9 , 11 A, B View Figure 11 ): cymbium oval. Embolus sickle-shaped; base slightly wrinkled. Tegular hood very wide. RTA large, rectangular, anvil-shaped; dorsally bifurcated, ending into two long, acute lobes, hidden behind a brush of setae; VTA hook-shaped attached medially on RTA.

Female ( paratype 2013 _ HF 3.2 _ AraThom 001 N _ 002; Figs 10 View Figure 10 , 11 C, D View Figure 11 ). Total length 4.81. Prosoma length 1.95; width 1.77. Opisthosoma length 2.86; width 2.65. Diameter of eyes: AME 0.09; ALE 0.20; PLE 0.18; PME 0.07. Interdistances between eyes: AME – AME 0.53; AME – ALE 0.14; ALE – ALE 0.97; PME – PME 0.52; PME – PLE 0.39; ALE – PLE 0.23; AME – PME 0.24; PLE – PLE 1.37. Leg measurements: leg I 5.47 (1.66, 0.57, 1.34, 1.13, 0.77); leg II -; leg III 3.69 (1.22, 0.47, 0.87, 0.63, 0.50); leg IV 4.12 (1.36, 0.46, 0.96, 0.76, 0.58). Habitus as in males, except prosoma and leg I reddish brown.

Epigynum (Figs 10 C, D View Figure 10 , 11 C, D View Figure 11 ): exterior plate large, hexagonal-shaped with wide anterior side. Atrium conspicuous, inverted heart-shaped with a separation in the middle. CO diagonally oriented, posteriorly facing. CD arch-shaped. Spermatheca elongated, peanut-shaped, with a small bump anteriorly.

Distribution.

Malaysia (Borneo: Sabah); Indonesia ( Sumatra: Jambi) (Fig. 19 View Figure 19 ).

Remarks.

Specimens from Borneo show slight differences in shape of embolus and dorsal tip of RTA (Fig. 12 B, C View Figure 12 ).