Monodontium tetrathela Kulczynski, 1908

Raven, Robert J., 2008, A Revision Of The Mygalomorph Spider Genus Monodontium Kulczynski (Barychelidae: Araneae), Raffles Bulletin of Zoology 56 (1), pp. 29-44 : 34-35

publication ID	https://doi.org/ 10.5281/zenodo.5340512
persistent identifier	https://treatment.plazi.org/id/EF4187B8-0E15-FFC4-FC36-B29DEB6AFE73
treatment provided by	Diego
scientific name	Monodontium tetrathela Kulczynski, 1908
status

Treatment

Monodontium tetrathela Kulczynski, 1908 View in CoL

( Figs. 1 View Fig , 2F View Fig , 3A–D View Fig )

Monodontium mutabile tetrathela Kulczynski, 1908: 450 View in CoL ; Roewer, 1942: 224; Bonnet, 1957: 2984.

Material examined. – Lectotype: Female, 4 juvenile paralectotypes (labelled syntypes, new designations), Lemien Berlinhafen, Bogadjim [= “Stephansort”, 5º25'S 145º45'E], L. Biro ( NMNH). GoogleMaps

Diagnosis. – Females differs from those of all other species in the presence of distinct PMS ( Fig. 3C View Fig ).

Description. – Lectotype, female (NMNH): Carapace 2.68 long, 2.04 wide. Abdomen 2.68 long, 2.04 wide. Total length, 6.0.

THE RAFFLES BULLETIN OF ZOOLOGY 2008

Colour in alcohol: Carapace red-brown with darker margins and brown caput and interstrial ridges, chelicerae light brown, legs uniformly yellow-brown. Abdomen dorsally brown with many white spots in posterior half, laterally pallid, venter similar with short transverse bands laterally.

Carapace: Bristles: few moderately long brown along lateral and interstrial margins; line was present anteromedially; few between PME and in front of AME. Clypeus absent. Fovea short, straight. Striae shallow, glabrous.

Eyes: Tubercle distinct. Three rows; back row slightly procurved. Eye group occupies 0.35 of head-width; front width, back width, length, 25:32:22. MOQ front width, back width, length, 17:21:13. AME:ALE:PME:PLE, 8:9:6:7. Eye interspaces: AME–AME, 2, AME–ALE, 4, ALE–ALE, 9, PME–PLE, 2, PME–PME, 12, ALE–PLE 8.

Chelicerae: Small, rounded. Narrow band of moderately long brown bristles dorsally and narrower band of shorter bristles laterally. Distally with few curved stiff spines, thickest spines on edge forming line of about 8–10 stiff spines. Outer fang smooth, inner with single medial keel. Promargin of furrow with 6 large teeth; basomesally with few granules.

Labium: 0.52 wide, 0.16 long; wider than long, with one cuspule; separated from sternum by continuous groove.

Maxillae: 0.76 long in front, 1.00 long behind, 0.46 wide; with about 9–11 cuspules along inner edge. Anterior lobe indistinct; heel broadly rounded. Lyra absent. With transverse glabrous groove on anterior face.

Sternum: 1.26 long, 1.30 wide. Rounded; uniformly setose; sigilla not evident.

Legs: Broken; patella to tarsus of leg IV and palp missing. Scantily setose but not hirsute.

Scopula: Very thin and widely divided on metatarsi I, and tarsi I, II; absent elsewhere.

Spines: Many thick stiff setae on prolateral tibia and metatarsi I and II. Leg 1, me v2. Leg 2: ti v1; me v2. Leg 3: pa p2; ti p1r1v2; me p3r2v9. Leg 4: fe 0; rest absent; palp, fe 0; rest absent.

Claws: Legs I, II with 3 teeth in outer, and 5 on inner rows; leg III with 3 in both rows. Claws of leg IV and palp unknown.

Trichobothria: In two rows on tibiae, each of 5–7 for two– thirds of length; about 5–7 filiform on metatarsi and tarsi in irregular rows.

Palp: Missing from femur.

Spermathecae: Two, each an unequally divided lobe ( Fig. 2F View Fig ).

Spinnerets: Four, PMS distinct; 0.12 long, 0.04 wide, 0.02 apart; PLS basal 0.38 long, 0.24 wide, 0.08 medial, 0.06 apical.

Male: Unknown.

Distribution. – Known only from Stephansort, NE New Guinea.

Remarks. – The type series of syntypes includes only one adult female; for the purposes of stability, designation of that as the lectotype is important as juvenile mygalomorphs often lack characters distinguishing the species.