Lacronia Strand, 1942

Carvalho, Rafael N. & Kury, Adriano B., 2024, Filling a geographic gap: a new species of genus Lacronia Strand, 1942 (Opiliones, Gonyleptidae) from southern Brazil, Zootaxa 5496 (3), pp. 417-428 : 418-419

Lacronia Strand, 1942

Luederwaldtia Mello-Leitão 1923: 518 [junior homonym of Luederwaldtia Schmidt, 1922 ( Hemiptera )]. Luederwaldtia originally in Pachylinae .

Luederwaldtia : Mello-Leitão 1926: 337, 1932: 166, 1935: 99; Roewer 1929: 218; Kästner 1937: 389; Soares & Soares 1954: 269; H. Soares 1966: 286; Muñoz-Cuevas 1973: 226.

Lacronia Strand 1942: 397 [available replacement name for Luederwaldtia Mello-Leitão, 1923 ].

Lacronia : Kury 2003a: 174, 2003b: 29; Kury & Orrico 2006: 148; Carvalho & Kury, 2023: 23.

Type species. Luederwaldtia serripes Mello-Leitão, 1923 , by original designation.

Included species. Lacronia boraceae (B. Soares, 1942) , Lacronia camboriu Kury, 2003 , Lacronia ceci Kury & Orrico, 2006 , Lacronia nigra ( Mello-Leitão, 1923) , Lacronia ricardoi Kury, 2003 , Lacronia serripes ( Mello-Leitão, 1923) , Lacronia tenuis ( Roewer, 1917) and Lacronia utaru sp. nov.

Diagnosis. As the inclusion of Lacronia utaru sp. nov. does not affect the generic diagnosis presented by Carvalho & Kury (2023a), it is repeated here without change. Lacronia resembles Discocyrtus s. str. in: a) stylus straight on the glans ( Figs. 5A–B ); b) apical portion of the stylus only as an undifferentiated extension of its stem ( Figs. 5A–B ); c) ventral process of the glans with the same diameter of the stylus ( Fig. 5B ); d) ocularium height (in lateral view) equals thrice or more the eyes diameter ( Figs. 3C , 4B–C ); e) Fe II–III with a retro-dorsal distal spur ( Figs. 2A , 3A , 4D ); f) Pa IV covered by acuminated tubercles on the dorsal side ( Figs. 3D , 4G–H, J ).

Lacronia can be differentiated from Discocyrtus s. str. by the following features: a) mesotergum area III on males with a pair of paramedian spines (a pair of subconical structures in L. ceci ) ( Figs. 3A, C–D , 4A–B, E ) (in Discocyrtus it has a pair of paramedian domes); b) mesotergum area IV of the AS not invading the posterior border of the DS (area IV invading the posterior border of the dorsal scutum in L. boraceae ) ( Figs 2A , 3A , 4A ) (in Discocyrtus only the median portion of the posterior border of the dorsal scutum penetrates area IV); c) Ti III mace-shaped ( Figs. 2A–D , 3A–B , 4D ) (in Discocyrtus it is tubular); d) Cx IV with acuminated tubercles on the prolateral surface ( Fig. 4A ) (in Discocyrtus they are blunt); e) Cx IV with a prodorsal apophysis crenated on the posterior portion ( Figs. 3A–B , 4A, F–G ) (in Discocyrtus the apophysis is smooth); f) Cx IV with prodorsal apophysis transversally arranged in relation to the body axis ( Figs. 2A , 3A , 4A ) (in Discocyrtus it is oblique); g) Tr IV subquadrangular-shaped ( Figs. 3A–B , 4A, G–J ) (in Discocyrtus it is rectangular); h) Fe IV substraight in dorsal view ( Figs 2A–B , 3A–C , 4G–J ) (in Discocyrtus it is arched).

Geographic distribution. BRAZIL: States of Paraná, Rio de Janeiro, Santa Catarina and São Paulo ( Fig. 1 ).

Figures

FIGURE 1. Southeastern and South Brazil, showing distribution of the eight species of Lacronia. The area shaded in dark green displays the Atlantic Province, as defined by Morrone et al. (2022). Inset: Location of the represented sector in South America.

FIGURE 2. Habitus in vivo of Lacronia utaru sp. nov., ♂ paratype (MNRJ 3697), from Brazil, Paraná, Paranaguá, Estação Ecológica do Guaraguaçu. A: dorsal view. B: fronto-dorsal view. C: posterior view. D: dorso-posterior view. E: ventral view. Photographs by Adriano Kury.

FIGURE 3. Lacronia utaru sp. nov., ♂ holotype (MHNCI). A: habitus, dorsal view. B: ventral view. C: lateral view. D: posterior view. E: Fe–Ta IV, prolateral view (left leg) and retrolateral view (right leg). Scale bars = 1 mm.

FIGURE 4. Lacronia utaru sp. nov., ♂ holotype (MHNCI). A: dorsal scutum, chelicerae, trochanters and coxae IV, dorsal view. B: dorsal scutum, lateral view. C: ocularium, anterior view. D: right Fe–Ti III, retrolateral view. E: armature of mesotergal area III, posterior view. F: detail of the prodorsal apophysis of coxa IV, posterior view. G–J: right Tr–Ti IV, G: dorsal view. H: prolateral view. I: ventral view. J: retrolateral view. K: right Mt–Ta IV, retrolateral view. Scale bars = 1 mm.

FIGURE 5. Lacronia utaru sp. nov., ♂ holotype (MHNCI), genitalia, distal part.A: dorsal view. B: lateral view. Scale bars: 100 μm. Letters A to E represent the AE11 macrosetae scheme (Kury & Villarreal 2015, Kury & Machado 2021).