On the genus Ammonius Thorell, 1899 (Mygalomorphae, Barychelidae): description of the female of A. pupulus, a new species and new distribution records Author Gonzalez-Filho, Hector M. O. 8C203170-36D5-4B48-A901-33600BA67BA3 Pós-graduação em Ecologia, Evolução e Biodiversidade, Instituto de Biociências, Universidade Estadual Paulista, Rio Claro, SP 13506 - 900, Brazil. gonzalezfilho@yahoo.com.br Author Guadanucci, José Paulo L. D4955FF5-FE7F-4E68-AB2F-4A89593F9850 Pós-graduação em Ecologia, Evolução e Biodiversidade, Instituto de Biociências, Universidade Estadual Paulista, Rio Claro, SP 13506 - 900, Brazil. & Departamento de Ecologia, Evolução e Biodiversidade, Instituto de Biociências, Universidade Estadual Paulista, Rio Claro, SP 13506 - 900, Brazil. jose.guadanucci@unesp.br Author Brescovit, Antonio D. D5B81D79-AFAE-47B1-8A6E-DAB448A24BCC Pós-graduação em Ecologia, Evolução e Biodiversidade, Instituto de Biociências, Universidade Estadual Paulista, Rio Claro, SP 13506 - 900, Brazil. antonio.brescovit@butantan.gov.br text European Journal of Taxonomy 2023 2023-03-15 861 1 113 131 http://zoobank.org/b55becf4-1716-4439-9bd2-e01b457f092e journal article 53798 10.5852/ejt.2023.861.2071 e5b1a4ee-623c-40cc-8784-913bf5ad87b8 2118-9773 7737509 B55BECF4-1716-4439-9BD2-E01B457F092E Genus Ammonius Thorell, 1899 Ammonius Thorell, 1899: 10 . Ammonius – Simon 1903: 915 . — Benoit 1965: 7 . — Raven 1985: 113 . Type species Ammonius pupulus Thorell, 1899 , by monotypy. Diagnosis Ammonius can be distinguished from the other barychelids by the apical segment of the PLS digitiform ( Fig. 1F ); compact eye group rectangular in shape ( Figs 1D , 4B , 5D , 9B ), eye tubercle flat; A. pupulus with eight eyes ( Figs 1D–E , 4B , 5D ); absence of AME in A. benoiti sp. nov. ( Fig. 9B ); male cymbium unequal, with prolateral lobe inconspicuous and retrolateral lobe strongly projected ( Figs 2 , 3C–D , 8C–E ). Males resemble Pisenor notius Simon, 1889 (see Benoit 1966 : figs 24, 26) by the strongly pronounced retrolateral lobe of the cymbium but differ by the lack of a spur on tibia I, and the modified palpal tibia, with a tibial concavity in the ventro-prolateral side of the palp on A. pupulus ( Fig. 3A–B ), and by the presence of a tibial thorn on the retrolateral side of the palp on A. benoiti ( Figs 8D–E , 9D ). Females of the genus can be distinguished from the other genera by the bilobed spermathecae, with the external stalk small and emerging from the basal region of the receptacle ( Fig. 5E ). Description Very small spiders, total length between 3.9–7.3. General coloration yellowish light brown ( Figs 1A–B , 5A–B , 8A–B ). Abdomen dorsally pale without pattern and spinnerets pale with some brown light setae on dorsal side ( Figs 1F , 8A ). Carapace ovate ( Figs 1A , 5A , 8A , 9A ). Thoracic fovea small and straight ( Figs 1A , 5A , 8A ). Clypeus narrow ( Figs 1D , 4B , 5D , 9B ). Eye tubercle black and flat ( Figs 1D , 5D ). Eye group in rectangular shape, anterior and posterior eye rows straight ( Figs 1D , 4B , 5D , 9D ). Ammonius pupulus with eight eyes ( Figs 1D–E , 4B , 5D ); A. benoiti sp. nov. with six eyes, AME absent ( Fig. 9A– B ). Labium rectangular, 2–6 cuspules rounded. Maxillae rectangular with 3–20 cuspules on inner corner, maxillary hell reduced. Anterior lobe short, not projected ( Figs 1C , 4C , 5C ). Maxillary lyra absent. Rastellum absent, distal edge of maxilla with thick setae ( Figs 1C , 5C ). Intercheliceral tumescence in males absent. Labiosternal groove shallow, flat, with pair of sigilla ( Fig. 4C ). Book lungs semi-circular, opening elliptical, and book lung combs absent. Plumose clavate trichobothria in two rows on distal half on all tarsi ( Fig. 4D ). Claws: ITC absent. STC with parallel row of teeth present on lateral edge on males and absent in females ( Figs 4E , 6A , 7A ). Frictional setae present in all tarsi, very evident, longer and inserted below the claw tuft plate ( Figs 4E–F , 6A–B , 7A ). Scopulae: on metatarsi I–II scopulate and absent on metatarsi III–IV; on tarsi I fully scopulate and tarsi II–IV slightly scopulate. Four spinnerets, PMS very small, PLS long with apical segment digitiform ( Fig. 1F ), with several spigots on apical half ( Fig. 4A ). Male palpal tibia with a ventral concavity in A. pupulus ( Figs 2E , 3A–B ), absent in A. benoiti . Tibial thorns on the retrolateral side of the palp in A. benoiti ( Figs 8D–E , 9D ). Tibial spur absent. Megaspine on the tibia I in A. benoiti ( Figs 8J , 9E ). Male palpal bulb with globose subtegulum, with thin and sinuous embolus in A. pupulus ( Fig. 2A–G ), and slightly curved embolus in A. benoiti ( Fig. 8F–I ). Spermathecae with two straight receptacles, external receptacle with globose lobe, emerging from the internal receptacle ( Fig. 5E ). Included species Ammonius pupulus Thorell, 1899 ; A. benoiti sp. nov. Distribution Cameroon and Ivory Coast ( Fig. 10 ).