minutus Roewer 1919
Creators: name: Pinto-Da-Rocha, Ricardo
name: Hara, Marcos Ryotaro
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy

description: Rivetinus minutus Roewer, 1919, new family assignment
(Figs. 2 and 4 D,E)
Rivetinus minutus Roewer 1919:132, pl. 13, Figs. 7 (dor hab), 7a–b (legI, IV), 1923:127 (rdesc), Fig. 133 (dor hab); Kury 2003: 28 (cat). (ma paratype; Ecuador, [Carchí], El Pelado, collected at 4150 m; without collector and date; SMF RI 311; examined). Note: Although not written in the label, according to the original description, the collector is Dr. Rivet, dated in i.1903.
Diagnosis: Zamorinae with unarmed ocularium, dorsal scutum mostly smooth, with mesotergal grooves I–IV backward, area I undivided, pedipalpal patella unarmed, coxae II–III without conspicuous armature, ventral plate of penis concave at the sides, with two distal roughly delimitated lobes, each one with acute and frontward corners.
Redescription: Male (holotype): Dorsum (Fig. 2 A,C): Measurements: DSL 3.0; OMW 2.3; PL 1.4; PW 1.8; Leg I 5.2; II 7.5; III 5.7; IV 7.6. Dorsal scutum mostly smooth, with constriction near groove I and between grooves II–III, widening from area II to posterior margin; mesotergal area I slightly wider. Prosoma high behind ocularium. Ocularium, large, high, domed. Mesotergal area I entire; II–III with a pair of small tubercles; IV with a short row of four small tubercles; grooves I–IV backward. Posterior margin and free tergites with one row of larger tubercles (on posterior margin shorter, placed in the middle). Anal operculum tuberculate.
Venter (Fig. 2 B): Coxae I–IV covered with tubercles, I with an anterior row of larger tubercles, two higher tubercles near coxapophysis.
Chelicera (Fig. 2 A,C,D): Segment I with several small dorsal tubercles, dorso-prolaterally swollen, bulla well-marked; II swollen, with a frontal-median projection between base of fingers (Fig. 2 D). Fixed and movable finger with five small teeth.
Pedipalpus (Fig. 2 E,G): Coxa with large ventral tubercle. Trochanter with two ventral tubercles (median larger). Femur with five ventral tubercles (basal larger). Patella unarmed. Tibia mesal IIi, ectal iIi. Tarsus mesal Iii, ectal Iii.
Legs (Fig. 2 F,H): Small tuberculate. Coxae I–II each with two dorsal tubercles; III with one tubercle directed to another lateral of II; IV ending at area II, tuberculate. Trochanter I with three ventral larger tubercles; IV inflated. Femur IV slightly curved inward, with two ventral rows of tubercles increasing in size subapically. Tarsal formula: 6(3), 11 (4), 6, 6.
Penis (Fig. 4 D,E): Truncus with three pairs of trifid long basal setae, two pairs of small, curved, unirramous setae on sides of stylus base and two unirramous pairs on ventral plate base. Ventral plate concave at the sides, with two distal roughly delimitated lobes, each one with acute and frontward corners. Stylus long, unique, without crest.
Coloration: Specimen discolored. Dorsal scute, chelicera and pedipalp dark yellow, legs light yellow. Female: unknown.
description: Published as part of Pinto-Da-Rocha, Ricardo & Hara, Marcos Ryotaro, 2009, New familial assignments for three species of Neotropical harvestmen based on cladistic analysis (Arachnida: Opiliones: Laniatores), pp. 33-46 in Zootaxa 2241 on pages 38-40, DOI: 10.5281/zenodo.190591