Sesieutes abruptus, Dankittipakul & Deeleman-Reinhold, 2013

Dankittipakul & Deeleman-Reinhold, 2013, Delimitation of the spider genus Sesieutes Simon, 1897, with descriptions of five new species from South East Asia (Araneae: Corinnidae), Journal of Natural History 47 (3), pp. 167-195 : 182-184

publication ID

https://doi.org/ 10.1080/00222933.2012.742165

publication LSID

lsid:zoobank.org:pub:97EFA23C-7537-4156-8EF0-2D38CF889F5B

DOI

https://doi.org/10.5281/zenodo.5575721

persistent identifier

https://treatment.plazi.org/id/03CE87AD-FFE0-5F51-FE1B-FE42FD805222

treatment provided by

Jeremy

scientific name

Sesieutes abruptus
status

sp. nov.

Sesieutes abruptus View in CoL sp. nov.

( Figures 1 E,F, 3 View Figure 3 E,F, 6 A–F)

Type material

Holotype. ♂, Malaysia, Pahang State, Tioman Island , 100 m, 26 June 2001, leg. A. Schulz and K. Vock ( MHNG, M01–41) .

Paratypes. One ♂, 1♀, data as holotype ( MHNG, M01–4) . Malaysia, Pahang State, Tioman Island: 1♂, 160 m, rainforest, 2 October 2001, leg. L. Monod ( MHNG, TM– 17) ; 2♂, 1♀, 100 m, 26 June 2001, leg. A. Schulz and K. Vock ( MHNG, M01–41) ; 2♀, footpath from Tekek to Juara , 240–300 m, disturbed rainforest, 29 June 2001, leg. P.J. Schwendinger ( MHNG, SIM–01 / 08) ; 1♂, 2♀, west side of Mt Kajang, 2 km east of Kg. Genting , 400 m, 2 July 2001, leg. A. Schulz and K. Vock ( MHNG, M01–107) ; 1♂, 1♀, 100 m, 26 June 2001, leg. A. Schulz and K. Vock ( MHNG, M01–41) ; 1♂, 500 m, 26 June 2001, leg. A. Schulz and K. Vock ( MHNG, M01–43) ; 1♂, path from Kg. Paya to Gunnung Kajang , 200–600 m, 6–7 June 2007, leg. A. Schulz ( MHNG, AS–WM–07 / 7) .

Diagnosis

Sesieutes abruptus sp. nov. closely resembles that of S. lucens in general appearance (compare Figures 1E View Figure 1 with 1A, and 1F cf. 1B). Males share with those of S. lucens , S. borneensis and S. bulbosus an elongated, heavily sclerotized distal RTA of the male palp, but can be distinguished by the subterminally, abruptly bent apex ( Figure 3E,F View Figure 3 ), and by the distinctly shorter, anteriorly situated conductor ( Figure 3E View Figure 3 ). Females resemble those of S. bifidus sp. nov. in having anteriorly located copulatory orifices and funnel-shaped proximal ducts ( Figure 6D,E View Figure 6 ), but can be distinguished by their simple insemination ducts ( Figures 6E,F View Figure 6 ).

Etymology

The specific epithet refers to the abruptly bent apex of the distal retrolateral tibial apophysis on the male palp.

Description

Male (holotype). Total length 4.24; prosoma 2.12 long, 1.48 wide; opisthosoma 2.50 long, 1.32 wide. Leg measurements: leg I 5.84 (1.58, 2.12, 1.22, 0.90); II 4.98

(1.32, 1.80, 1.06, 0.80); III 4.22 (1.21, 1.20, 1.06, 0.74); IV 6.46 (1.68, 2.02, 1.80, 0.96).

Leg spination. Leg I: Fe d–1 p–1, Ti v–2–2 –2–2–2–2–2, Mt v–2–2 –2–2; leg II: Ti v–2–2 –2–2–2–2–2, Mt v–2–2 –2–2; leg III: Ti v–1–2 –2, Mt v–1–1 –2; leg IV: Fe d–1, Ti v–1–2 –2 r–1, Mt p–1, v–1–2, r–1.

Pattern and coloration ( Figure 1E View Figure 1 ). Carapace brown; integument strongly granulated, granules minute, each with short setae; chelicerae, labium and gnathocoxae orange-brown; sternum dark brown; legs bicolored, coxae to femora orange-brown, patellae to tarsi yellow, distal half of femora I and IV yellow distally. Opisthosoma ovoid, widest posteriorly; dorsum pale grey; venter pale; dorsal scutum orange-brown, occupying three-quarters length of opisthosoma; spinnerets white.

Palp ( Figures 3 E,F, 6 A–C). Palpal tibia with digitiform prolateral excrescence; proximal RTA truncated, represented by elevated ridge with broad membranous apex in ventral view, more or less triangular in lateral view; distal RTA heavily sclerotized, elongated, triangular, apex subterminally abruptly bent ectad; conductor lanceolated, base rather broad, originating on mid-apical portion of tegulum; tegular apophysis spiniform, hyaline, originating near base of conductor.

Female (paratype, MHNG). Total length 4.36; prosoma 2.18 long, 1.52 wide; opisthosoma 2.48 long, 1.38 wide. Leg measurements: leg I 5.98 (1.62, 2.18, 1.24, 0.92); II 5.12 (1.36, 1.84, 1.10, 0.80); III 4.34 (1.26, 1.23, 1.09, 0.76); IV 6.64 (1.74, 2.06, 1.84, 0.98). Leg spination. Leg I: Fe d–1 p–1, Ti v–2–2 –2–2–2–2–2, Mt v–2–2 –2–2–2; leg II: Ti v–2–2 –2–2–2, Mt v–2–2 –2–2; leg III: Ti p–1 v–1–1 –1–1, Mt p–1–1 v–1–1 r–1; leg IV: Ti p–1–1 v–1–1 –1–1 r–1, Mt p–1–1, v–1–1, r–1.

Pattern and coloration ( Figure 1F View Figure 1 ). Carapace reddish brown; integument strongly granulated, granules minute; chelicerae, labium and gnathocoxae orange-brown; sternum brown; legs bicolored, coxae to femora orange-brown, patellae to tarsi yellow, distal half of femora I and IV yellow distally, tibiae III and IV with median band of dark green. Opisthosoma ovoid; dorsum pale grey; venter pale; dorsal scutum orangebrown, semi-circular, occupying one-third length of opisthosoma, followed by pair of muscle apodemes and seven pale chevrons; spinnerets white.

Genitalia ( Figure 6D–F View Figure 6 ). Copulatory orifices teardrop-shaped, situated anteriorly, connected to funnel-shaped proximal ducts; insemination ducts short, obliquely arranged; spermathecae elliptical, situated posteriorly, each with anteriorly situated, circular gland opening; fertilization ducts elongated, acicular.

Natural history

Types of S. abruptus sp. nov. were collected by sifting decomposing organic litter in evergreen rainforests.

Distribution

Known only from Tioman Island, Malaysia.

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Liocranidae

Genus

Sesieutes

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