Psechrus annulatus Kulczy
Creators: name: Bayer, Steffen
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Psechridae
Psechrus
Psechrus annulatus

description: Psechrus annulatus Kulczy ń ski, 1908, stat. nov.
Figs 12a–d, 81f, 82i, 87e, 90e
Psechrus annulatus Kulczy ṅski 1908: 565, pl. 23, fig. 21 (Description and illustration of ♀). [Lectotype ♀ (SB 829, light one), here designated, from INDONESIA: Java, Jawa Tengah Province: Nusa Kembangan; present from Dr. M. Raciborski; MIZ F•790; Paralectotype: 1 ♀ (SB 830, dark one) from INDONESIA: Java, Jawa Barat Province: Nyalindung; “ciemny” (note by Kulczyṅski to differentiate this specimen from the other specimen in this series; “ciemny” means ‘dark one’); present from Dr. M. Raciborski; MIZ F•790, all type material examined]. Berland and Berland 1914: 133. Hogg 1914: 56; 1915: 436. Fage 1929: 360. Lehtinen 1967: 260. Levi 1982: 125 (Syn. with P. singaporensis, rejected).
Psechrus singaporensis — Levi 1982: 125, figs 40–53, ad part, figs 42–43, 48–53 misidentified, figs 52–53 (Illustration of ♀).
Additional material examined. INDONESIA: Java, Jawa Barat Province: Pananjung, Pasir Paninjoan (‘Penandjoeng’); ‘Akquisitions-Datum: 15.X.1938 ’; Reimoser det.; 1 juv. (SB 1094), NHMW 12˙385.
Additional doubtful material. INDONESIA: Java, Jawa Barat Province: Cibodas (‘Tjibodas’); K. Kraepelin leg. 23.–28.III.1904 and ded.; E. Simon det. Psechrus sp. VIII. 1904; acquisition 08.VI.1904; 1 juv. (SB 1073), ZMH.
Revised diagnosis (see also diagnosis for annulatus -group above). Females similar to P. aluco sp. nov. in having rounded copulatory ducts (CD). Distinguished by the distinctly larger CD and by the spermathecal heads (SH), which are located anterio-medially at spermathecae (Fig. 12c). The latter —if vulva is viewed from dorsal— not extending beyond CD, in none direction. Moreover, median septum (MS) (Fig. 12a–b, 87e) not as strongly protruding as in P. aluco.
Description. Male: unknown.
Female: (Measurements of lectotype first, those of paralectotype in parentheses).
Body and eye measurements. Carapace length 4.8 (5.3), carapace width 3.2 (3.5), anterior width of carapace 2.1 (2.2), opisthosoma length 8.5 (8.9), opisthosoma width 3.0 (3.2). Eyes: AME 0.31 (0.32), ALE 0.37 (0.40), PME 0.35 (0.41), PLE 0.36 (0.40), AME–AME 0.22 (0.21), AME–ALE 0.04 (0.07), PME–PME 0.26 (0.26), PME–PLE 0.27 (0.28), AME–PME 0.43 (0.49), ALE–PLE 0.40 (0.45), clypeus height at AME 0.87 (0.81), clypeus height at ALE 0.61 (0.55).
Cheliceral furrow with three promarginal and four retromarginal teeth.
Measurements of palp and legs. Leg formula: 1423. Palp: 5.5 (6.2) [1.9 (2.1), 0.7 (0.9), 1.0 (1.1), 1.9 (2.1)]; Legs: I 42.3 (38.6) [11.2 (10.1), 2.0 (2.2), 12.6 (10.6), 10.8 (10.0), 5.7 (5.7)], II 30.4 (29.6) [8.6 (8.3), 1.8 (2.0), 7.9 (7.5), 7.5 (7.5), 4.2 (4.3)], III 21.1 (20.3) [6.1 (6.1), 1.4 (1.4), 5.1 (4.9), 5.5 (5.0), 3.0 (2.9)], IV 32.2 (31.9) [9.1 (9.0), 1.6 (1.9), 8.3 (8.1), 8.4 (8.2), 4.8 (4.7)].
Palpal claw with 14 (14) teeth.
Spination. Palp: 141 (131), 110 (110), 1101 (1101), 1014 (1014); legs: femur I 656 (656), II 555 (656) III 555 (545), IV 555 (555); patella I–IV 000 (000); tibia I–II 3036 (3036), III 3236 (3234, distal, dorsal spine small), IV 3234,3235 (3134); metatarsus I–III 3035 (3035), IV 3034, 3035 (3035).
Copulatory organ (see also diagnosis and general description of annulatus -group). MS posteriorly ca. 1.5x broader than in between the two copulatory openings (CO) (Fig. 12a–b). Epigynal muscle sigilla (EM) and slit sense organs outside epigynal field. Spermathecae cross-oval (Fig. 12c).
Colouration (see also description for annulatus -group and Psechrus). Width of lateral bands on carapace medium-sized (ca. 1.3x diameter of PME) and hardly serrated.
Variation of copulatory organs. In paralectotype (SB 830) MS and CO differ (Fig. 12b). In SB 830 CO a bit smaller than in lectotype. However, vulva (not illustrated) matches that of lectotype.
Remark. This species is removed from synonymy with P. singaporensis Thorell, 1894 because the copulatory organs differ distinctly from P. singaporensis. Also a few somatic characters differ. Psechrus annulatus is not only a different species to P. singaporensis, it also belongs to a different species-group.
The juvenile specimens SB 1094 from Pasir Paninjoan, Jawa Barat and SB 1073 from Cibodas, Jawa Barat show the same spination pattern at tibia III & IV like the lectotype (SB 829). As the recording locality of SB 1073 matches the type locality of P. aluco sp. nov., it may belong to P. aluco, which differs from P. annulatus in spination pattern of tibia III & IV. As from P. aluco only one single ♀ was available and from annulatus only two ♀♀ the difference in dorsal spination of tibia III & IV may be artificial. So, without checking more material, the identification of SB 1073 remains unclear. Eugène Simon examined this specimen for his study on spiders of Java (Simon 1905a) and identified it as Psechrus sp.
Distribution. Indonesia [Java] (Fig. 100) .
description: Published as part of Bayer, Steffen, 2012, The lace-sheet-weavers — a long story (Araneae: Psechridae: Psechrus), pp. 1-170 in Zootaxa 3379 (1) on pages 32-33, DOI: 10.11646/zootaxa.3379.1.1, http://zenodo.org/record/6039832