Myrmecotypus regianeae 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 regianeae

description: Myrmecotypus regianeae spec. nov.
Figs 16A–J, 17A–F
Type material. ♂ holotype, BRAZIL: Rio Grande do Sul: Roca Sales [29°17’37.4’’S, 51°49’34.0’’W], 1♂, 24.V.1986, A.D. Brescovit, leg. (MCN-15088).
Paratypes: BRAZIL: Pará: Canaã dos Carajás, Mina do Sossego [06°24’36.7’’S, 50°03’06.0’’W], 1♂ 1♀, 5. III.2004, E. Wanzeler leg. (MPEG-(ARA)-003134); Espírito Santo: São Mateus, Reserva Florestal Vale do Rio Doce [19°09’05.5’’S, 40°04’15.0’’W], 1♀, 5–12.I.1998, A.D. Brescovit leg. (IBSP, IB-16645).
Etymology. The specific name is a patronym in honor of the great Brazilian arachnologist Dra. Regiane Saturnino.
Diagnosis. Males of Myrmecotypus regianeae spec. nov. resemble M. jasmineae by the tibia I ventral spination 3-2 and coxae II and III translucent white and I and IV black (Fig. 16C, F), but it differs by the presence of a pre-embolic ridge and a short embolus with a smooth wide tip (Fig. 16G), whereas the embolus has a distinctly twisted tip in M. jasmineae (Leister & Miller 2012: fig. 1F, G). Females resemble those of M. fuliginosus and M. lineatipes by coxae II and III being translucent white and I and IV black, but it differs by the wrinkled epigyne, without a transverse ridge and very small CO (Fig. 16I), whereas the epigyne of M. fuliginosus has a transverse ridge present (Reiskind 1969: fig. 251) and that of M. lineatipes has large CO (Reiskind 1969: fig. 249).
Description. Male (MCN-15088). Total length 5.14. Carapace 2.78 long, 1.45 wide. Sternum 1.07 long, 0.68 wide. Abdomen 2.24 long, 1.55 wide. Eye diameters: AME 0.10, ALE 0.05, PME 0.05, PLE 0.07. Eye inter-distances: AME-AME 0.13, AME-ALE 0.04, ALE-PLE 0.17, PME-PME 0.27, PME-PLE 0.18, AME-PME 0.16. Carapace brownish-black, somewhat narrowed in head region, with moderate constriction in cephalic region, anterior margin truncated. Feathery hairs cover carapace, heavily distributed in ocular area. Endites and labium brownish-black. Chelicerae brown, two promarginal teeth of different sizes and two retromarginal teeth equal and equidistant. Sternum brownish-black, shield-shaped and covered in sparse feathery hairs (Fig. 16C). Abdomen with dorsal scute brownish-black, covered by feathery hairs, ventral scute brownish-black, quadrangular-shaped, tracheal scute brownish-black (Fig. 16A, B). Coxae II and III translucent white, the rest black. Trochanters following pattern of coxae, femora I and II white, with one black ventrolateral longitudinal line and dorsal surface with medial black line tapering distally, patellae, tibiae and metatarsi yellow with black pro- and retrolateral lines. Tarsus I brown and II yellow. Legs III and IV with femora, tibiae and metatarsi brownish-black, patellae yellow with dorsal surface brownish-black, tarsi yellow. Leg measurements: I—femur 1.41 / tibia 1.43 / metatarsus 1.17; II—femur 1.35 / tibia 1.23 / metatarsus 1.04; III—femur 1.27 / tibia 0.99 / metatarsus 1.08; IV—femur 1.90 / tibia 1.52 / metatarsus 1.73. Spination: I-femur do 1-0-0-1, pl 0-0-0-1; tibia ve 1p-2-2 (3-2); metatarsus ve 2-2/ II-femur do 1-0-1-1, pl 0-1-0-1, rl 0-1-0-1; tibia ve 2-2; metatarsus ve 2-2/ III-femur do 0-0-1-1; 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. Pedipalp with RTA spiniform. Palp with globose genital bulb drawn into long neck ending in pre-embolic ridge; embolus short, wide, tip smooth (Fig. 16G, H).
Female (IBSP, IB-16645). Total length 5.55. Carapace 2.86 long, 1.45 wide. Sternum 1.15 long, 0.68 wide. Abdomen 2.26 long, 1.60 wide. Eye diameters: AME 0.12, ALE 0.03, PME 0.07, PLE 0.06. Eye inter-distances: AME-AME 0.12, AME-ALE 0.04, ALE-PLE 0.17, PME-PME 0.26, PME-PLE 0.16, AME-PME 0.17. Carapace as in male. Endites and labium brownish-black. Chelicerae brown, two promarginal teeth of different sizes and two retromarginal teeth equal and equidistant. Sternum brownish-black, shield-shaped, covered in sparse feathery hairs. Abdomen globose, with moderately small, brownish-black dorsal scute, feathery hairs covering as in male (Fig. 16D). Coxae II and III translucent white, remainder as in male. Leg measurements: I—femur 1.45 / tibia 1.47 / metatarsus 1.03; II—femur 1.50 / tibia 1.28 / metatarsus 1.00; III—femur 1.14 / tibia 1.10 / metatarsus 1.00; IVfemur 1.95 / tibia 1.62 / metatarsus 1.68. Spination: I-femur do 1-0-0-1, pl 0-0-0-1; tibia ve 1p-2-2 (3-2); metatarsus ve 2-2/ II-femur do 1-0-1-1, pl 0-1-0-1, rl 0-1-0-1; tibia ve 2-2; metatarsus ve 2-2/ III-femur do 0-0-1-1; 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 wrinkled, copulatory openings small. Vulva with small globose spermathecae followed by short neck. Copulatory ducts moderately large (Figs 16I, J, 17E).
Variation. Length (1♀) total 5.24, carapace 2.83, femur I 1.46.
Other material. BRAZIL. Piaui: Caracol, Parque Nacional da Serra das Confusões [09°13’23.8’’S, 43°29’23.2’’W], 1♂, X.2006, P. R. R. Silva leg. (CHNUFPI-(ARA)-0139); Tomé-Açu, Embrapa [02°35’32.2’’S, 48°21’37.1’’W], 1♂, 9.X.2009, Dinaldo leg. (MPEG); Tocantins: Porto Nacional [10°41’02.5’’S, 48°29’09.9’’W], 1♀, 10–13.XI.1992, E.H. Buckup leg. (MCN-28691); Bahia: Juçari [15°10’43.9’’S, 39°31’01.0’’W], 1♀, 24.I.1970 (MNRJ-07603).
Distribution. States of Piaui, Pará, Tocantins and Bahia, Brazil (Fig. 27).
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 pages 476-479, DOI: 10.11646/zootaxa.5555.4.1, http://zenodo.org/record/14594905