Myrmecotypus ciriaco Silva-Junior & Bonaldo, 2024, spec. nov.
Creators: name: Silva-Junior, Cláudio J.
name: Bonaldo, Alexandre B.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Corinnidae
Myrmecotypus
Myrmecotypus ciriaco

description: Myrmecotypus ciriaco spec. nov.
Figs 22A–J
Type material. Holotype, ♂, BRAZIL: Maranhão, Cidelândia, Reserva Extrativista do Ciriaco, 05°16’09.482”S, 47°50’13.302”W, 7.X.2019, C. Figueredo leg. (UEMASUL.ARA-000284).
Paratype: Same data as holotype, 1♀, J. Guajajara leg. (UEMASUL.ARA-000285).
Etymology. The name of this species refers to the Conservation Unit where it was collected, Reserva Extrativista do Ciriaco, located in southwestern Maranhão, Brazil.
Diagnosis. Males of the Myrmecotypus ciriaco spec. nov. resembles those of M. haddadi Perger & Rubio, 2021 and M. niger Chickering, 1937 by the presence of a sclerotized RTP and tibia I ventral spination 3-3 but differs by the coxae I and II white (only coxa II white in M. niger and M. haddadi Perger & Rubio, 2021), by the wide base of the RTP and by the embolus straight (Fig. 22G). Females differ from those all other species by the presence of the posterior plate (Fig. 22I, J).
Description. Male (holotype). Total length 5.14. Carapace 2.81 long, 1.29 wide. Sternum 1.85 long, 0.82 wide. Abdomen 3.28 long, 2.22 wide. Eye diameters: AME 0.12, ALE 0.05, PME 0.06, PLE 0.07. Eye inter-distances: AME-AME 0.08, AME-ALE 0.05, ALE-PLE 0.17, PME-PME 0.24, PME-PLE 0.15, AME-PME 0.11. Carapace darker, with shallow constriction between cephalic and thoracic regions, anterior margin truncated, covered with feathery hairs, reinforced on sides and anteriorly, thoracic region with long hairs on surface (Fig. 22A, B). Endites and labium yellowish-brown. Chelicerae dark-brown, two retromarginal teeth different sizes and one small denticle, three promarginal teeth equal and equidistant. Sternum dark-brown and elongate. Abdomen pear-shaped, with nearly complete dark brown dorsal scute covered by feathery hairs (Fig. 22B). Ventral scute quadrangular-shaped, brownish, tracheal scute same color. Coxae I and II translucent white, III and IV dark-brown (Fig. 22C). Femora I and II white, proximal area darker and darker ventrolaterally and dorsally; patellae and tibiae I and II white dorsal and ventrally, darker pro- and retrolaterally; metatarsi I and II darker, tarsi I and II white. Legs III and IV dark-brown with tarsi white. Leg measurements: I—femur 1.25 / tibia 1.14 / metatarsus 0.83; II—femur 1.18 / tibia 1.03 / metatarsus 0.80; III—femur 1.18 / tibia 0.83 / metatarsus 0.96; IV—femur 1.92 / tibia 1.20 / metatarsus 1.33. Spination: I-femur do 0-1-0-1, pl 0-0-0-1; tibia ve 2-2-2 (3-3); metatarsus ve 2-2/ II-femur do 0-1-0-1; tibia ve 2-2-2; metatarsus ve 2-2/ III-femur do 0-0-1; pl 0-1-1, rl 0-1-1; tibia do 0-0-1, pl 0-1-1, rl 0-1-1, ve 2-2; metatarsus pl 1-1- 0-1, rl 1-1-0-1, ve 2-2-2-1/ IV-femur do 1-0-1-1, pl 0-0-0-1, rl 0-0-0-1; tibia do 0-0-1, pl 1-0-1, rl 1-0-1, ve p 1-0-1; metatarsus pl 1-1-0-1, rl 1-1-0-1, ve 2-2. Palp without RTA, globose genital bulb drawn into short neck, sperm duct five-folded (Fig. 22G, H).
Female (paratype). Total length 5.65. Carapace 3.15 long, 1.37 wide. Sternum 1.26 long, 0.96 wide. Abdomen 3.18 long, 2.46 wide. Eye diameters: AME 0.19, ALE 0.07, PME 0.14, PLE 0.13. Eye inter-distances: AME-AME 0.12, AME-ALE 0.05, ALE-PLE 0.12, PME-PME 0.23, PME-PLE 0.16, AME-PME 0.14. Carapace shape and collar as in male. Endites and labium brown. Chelicerae brown, two retromarginal teeth different sizes and one small denticle, three promarginal teeth equal and equidistant. Sternum and abdomen as in male, with large, dark-brown dorsal scute, feathery hairs covering as in male. Ventral scute absent and tracheal scute present. Coxae I and II translucent white, III and IV brown. Femora I and II white on pro- and retromargin, with two brown ventrolateral lines and brown dorsally; patellae, tibiae and tarsi white; metatarsi yellowish-brown. Legs III and IV yellowish-brown, with patellae white ventrally. Leg measurements: I—femur 2.11 / tibia 2.05 / metatarsus 1.83; II—femur 1.74 / tibia 1.58 / metatarsus 1.47; III—femur 1.70 / tibia 1.46 / metatarsus 1.59; IV—femur 2.49 / tibia 2.16 / metatarsus 2.430. Spination: I-femur do 0-1-0-1, pl 0-0-0-1; tibia ve 2-2-2 (3-3); metatarsus ve 2-2/ II-femur do 0-1-0-1; tibia ve 2-2-2; metatarsus ve 2-2/ III-femur do 0-0-1; pl 0-1-1, rl 0-1-1; tibia do 0-0-1, pl 0-1-1, rl 0-1-1, ve 2-2; metatarsus pl 1-1-0-1, rl 1-1-0-1, ve 2-2-2-1/ IV-femur do 1-0-1-1, pl 0-0-0-1, rl 0-0-0-1; tibia do 0-0-1, pl 1-0-1, rl 1-0-1, ve p 1-0-1; metatarsus pl 1-1-0-1, rl 1-1-0-1, ve 2-2. Epigyne without transverse ridge, with two small posterior plates. Vulva with two moderately large, globose spermathecae with long necks. Copulatory duct moderately thin, inserted ventrally (Fig. 22I, J).
Other material. Only the types.
Distribution. Known only for the type locality (Fig. 25).
description: Published as part of Silva-Junior, Cláudio J. & Bonaldo, Alexandre B., 2024, A revision of the South American species of the ant-mimicking spider genus Myrmecotypus O. Pickard-Cambridge, 1894 (Araneae: Corinnidae: Castianeirinae), pp. 451-496 in Zootaxa 5555 (4) on page 486, DOI: 10.11646/zootaxa.5555.4.1, http://zenodo.org/record/14594905