Clinobiantes paradoxus Roewer, 1927

Mamani, Vanesa, Jocqué, Merlijn & Pérez-González, Abel, 2025, Notes on African Biantinae with sexual dimorphism in leg II: five new Metabiantes species and redescription of Clinobiantes paradoxus (Opiliones: Laniatores: Biantidae), European Journal of Taxonomy 1006, pp. 1-58 : 4-10

publication ID	https://doi.org/10.5852/ejt.2025.1006.2989
publication LSID	lsid:zoobank.org:pub:E4FAF05B-5420-42B0-AB8D-5870FD3E370A
DOI	https://doi.org/10.5281/zenodo.16755630
persistent identifier	https://treatment.plazi.org/id/03C2879B-FFED-FFBB-4475-A6FA60D1F5D0
treatment provided by	Plazi
scientific name	Clinobiantes paradoxus Roewer, 1927
status

Treatment

Clinobiantes paradoxus Roewer, 1927 View in CoL

Figs 1 View Fig , 3–6 View Fig View Fig View Fig View Fig ; Table 1 View Table 1

Clinobiantes paradoxus Roewer, 1927: 302 View in CoL , fig. 17.

Clinobiantes paradoxus View in CoL – Staręga 1992: 323.

Type material

Lectotype here designated CAMEROON • ♂; Bibundi; SMF 9900064 About SMF (examined) ( Fig. 2 View Fig ).

Paralectotype CAMEROON • ♀; same data as for lectotype; SMF 9900064 About SMF (examined) ( Fig. 2 View Fig ) .

Remarks

A second female is morphologically different and not conspecific with the male lectotype of Clinobiantes paradoxus or the female paralectotype herein designated ( Fig. 2 View Fig ).

Redescription

Male (lectotype, SMF 9900064)

BODY MEASUREMENTS. Total body length 2.48, carapace length 0.76, scutum magnum length 2.17, carapace maximum width 1.36, abdominal scutum maximum width 1.8. Appendage measurements in Table 1. View Table 1

DORSUM. Outline slightly hourglass-shaped (almost rectangular) with Eta (η) shape, with a very slight constriction at sulcus I level ( Figs 1A View Fig , 3A View Fig ). Carapace granulated, wider than long, anterior border slightly convex and unarmed ( Figs 1A View Fig , 3A View Fig ). Cheliceral sockets not marked ( Figs 1A View Fig , 3A View Fig ). Eyes separated near sulcus I ( Figs 1A View Fig , 3A View Fig ); interocular area granulated ( Figs 1E View Fig , 3A View Fig ). Carapace in lateral view straight at anterior region and slightly higher posteriorly ( Fig. 1E View Fig ). Abdominal scutum in lateral view convex ( Fig. 1E View Fig ). Sulcus I deep and well-marked, in dorsal view curved to the anterior body region ( Figs 1A, E View Fig , 3A View Fig ). Mesotergal areas coarsely granulated and well-defined, with sulci II–V marked but shallower than sulcus I; medially sulci II–III slightly curved to the anterior body region; sulci IV–V straight ( Figs 1A, E View Fig , 3A View Fig ). Mesotergal areas III–IV medially with two conical and pointed tubercles, strongly inclined backward ( Figs 1A, E–F View Fig , 3A View Fig ). Mesotergal area V granulated, medially with three conical and pointed tubercles. Lateral borders of abdominal scutum with rows of granules ( Figs 1A, E View Fig , 3A View Fig ). Free tergites granulated; free tergite I medially with three small conical tubercles ( Figs 1A, E View Fig , 3A View Fig ).

VENTER. Coxa I with some setiferous tubercles in anterior margin ( Fig. 1C View Fig ); coxa II incrassated, of same size as (or slightly larger than) coxa IV ( Fig. 1B–D View Fig ); anteroposterior borders of coxa III with a row of strong granules connecting with coxae II and IV, respectively ( Fig. 1B–D View Fig ). Posterior border of spiracular area and free sternites I–V with a row of granules; anal operculum with few granules ( Fig. 1D, F View Fig ). Spiracles not concealed ( Fig. 1B, D View Fig ).

CHELICERA. Basichelicerite unarmed, with an elongated and slightly marked bulla ( Figs 1E View Fig , 3D View Fig ). Cheliceral hand with sparse setae ( Fig. 3D–E View Fig ). Fixed and movable fingers with small triangular-shaped teeth ( Fig. 3E View Fig ).

PEDIPALP. Coxa elongated (i.e., remarkably longer than trochanter), proximally with one dorsoectal and one ectoventral granule ( Figs 1A, C View Fig , 3A View Fig ). Femur straight, proximally with a slight ventral narrowing followed by a small ventral spine ( Figs 1E View Fig , 3B–C View Fig ). Patella elongated, club-shaped, with a distal ventromesal spine ( Figs 1E View Fig , 3B–C View Fig ). Tibia with two ventromesal and two ventroectal long spines ( Fig. 3B–C View Fig ). Tarsus with two ventromesal and two ventroectal long spines ( Figs 1E View Fig , 3B–C View Fig ).

LEGS. Femur II fusiform dorsally swollen ( Figs 1A, B View Fig , 6B View Fig ). Tibia II slender, slightly distally swollen, with ventral small triangular tubercles ( Fig. 6D View Fig ). Metatarsus II with a ventrally swollen astragalus bearing two rows of triangular tubercles; astragalus-calcaneus boundary marked by a strong constriction, and slightly thickened calcaneus giving a peculiar form to the distal part of the metatarsus ( Fig. 6F View Fig ). Tarsi III–IV with a dense scopula. Tarsal formula: 3(2):5(3):5:5.

COLOR (in 80% ethanol). Body and appendages uniformly yellowish-brown ( Figs 1A–F View Fig , 6B, D, F View Fig ).

MALE GENITALIA. Penis with clearly defined boundaries between pars basalis and pars distalis ( Fig. 4A View Fig ). Pars basalis tubular, basally thin, broadens medially, with distal constriction ( Fig. 4A View Fig ). Pars distalis swollen, with maximum width at titillator level ( Fig. 4A–B, D View Fig ). Apical edge laminar (i.e., dorsoventrally flat) with a medial U-shaped cleft dividing it into two rounded halves ( Fig. 4B, D View Fig ); halves less chitinous apically, and could possibly be inflated by hemolymph pressure ( Fig. 4C–D View Fig ). Pars distalis with a distal depression in the ventromedial region ( Fig. 4D View Fig ). Each side of pars distalis armed with short, conical microsetae arranged irregularly, extending from the dorsolateral to the ventrodistal region ( Fig. 4B–D View Fig ). Capsula externa with two broad titillators covering most capsula interna ( Fig. 4B–C View Fig ). Capsula interna with two complex conductors and one stylus, basally fused. Each conductor with two medial laminar folds apically, one short dorsal and one ventral longer, visible ventrally within the U-shaped cleft; each conductor also with one broad lateral projection ( Fig. 4B View Fig ); stylus tubular, with its free tip fully covered by conductors ( Fig. 4B–D View Fig ).

Tr Fe Pa Ti Mt Ta T Pedipalp 0.37 1.94 1.29 0.79 – 0.67 5.06 ♂ SMF 9900064* Leg I Leg II 0.32 0.52 1.54 5.17 0.52 1.25 1.39 3.84 2.01 4.02 1.21 2.24 6.99 17.04 Leg III 0.44 2.64 0.68 1.78 3.25 1.04 9.83 Leg IV 0.41 3.85 0.76 2.46 4.46 1.21 13.15 Pedipalp 0.40 1.97 1.17 0.79 – 0.63 4.96 Leg I 0.32 1.60 0.52 1.29 1.89 1.14 6.76 9900064 Leg III 0.39 2.47 0.67 1.69 3.08 1.07 9.37 Leg IV 0.50 3.47 0.87 2.20 4.39 1.21 12.64

♀ SMF Leg II 0.44 4.02 1.06 3.00 3.20 2.07 13.79

Female (paralectotype, SMF 9900064)

BODY MEASUREMENTS. Total body length 2.82, carapace length 0.76, scutum magnum length 2.31, maximum carapace width 1.38, abdominal scutum maximum width 1.88. Appendage measurements in Table 1. View Table 1

BODY. Female resembles male in armature of scutum magnum, but with tubercles of mesotergal areas III–IV, posterior border, and free tergite I slightly smaller ( Fig. 5A–B View Fig vs Fig. 1E View Fig ). Leg II with femur, tibia, and metatarsus neither swollen nor armed ( Fig. 6A, C, E View Fig vs Fig. 6B, D, F View Fig ); metatarsus II thin and unarmed, with pseudoarticular rings ( Fig. 6E View Fig vs Fig. 6F View Fig ). Tarsal formula 3(2):5(3):5:5.

FEMALE GENITALIA. Ovipositor cylindrical ( Fig. 5C View Fig ), distally bearing two lobes (furca) ( Fig. 5C–D, F View Fig ). Each furcal lobe with five long, pointed setae ( Fig. 5E View Fig ) – three dorsal and two ventral – resulting in a total of six setae on the dorsal region ( Fig. 5D View Fig ) and four on the ventral region ( Fig. 5F View Fig ). External surface of furcal lobes with several short, pointed projections, irregularly distributed ( Fig. 5E View Fig ). Receptacle chambers located near the base of the furcal groove ( Fig. 5D–F View Fig ).