Myrmecotypus candianii, Silva-Junior & Bonaldo, 2024

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), Zootaxa 5555 (4), pp. 451-496 : 481-483

Myrmecotypus candianii spec. nov.

Figs 19A–J

Type material. BRAZIL: holotype, ♂, Pará, Belém, Campus de Pesquisa do Museu Paraense Emílio Goeldi [01°27’00.2’’S, 48°26’42.5’’W], IX.2008, D.F. Candiani leg., ( MPEG ( ARA)-035467) .

Paratype: BRAZIL: Pará, Belém, Campus de Pesquisa do Museu Paraense Emílio Goeldi [01°27’00.2’’S, 48°26’42.5’’W], 1♀, 20. IV .2003, J.A. Barreiros leg. ( MPEG ( ARA) -035466) .

Etymology. The specific name is a patronym in honor of arachnologist Dr. David F. Candiani who contributed greatly to the knowledge of Neotropical Castianeirinae during his time at the Museu Goeldi.

Diagnosis. Both males and females of Myrmecotypus candianii spec. nov. resemble those of M. ednae spec. nov. by the elongate thoracic region (twice the length of cephalic region), coxa I light brown and coxa II white, but differ by the absence of an RTA and the embolus short and folded (compare Figs 18G, H and 19G, H). Females differ by the epigynal transverse ridge procurved, with a small marginal sclerotized area (compare Fig. 18I and 19I).

Description. Male (holotype). Total length 6.08. Carapace 3.54 long, 1.24 wide. Sternum 1.69 long, 0.59 wide. Abdomen 2.34 long, 1.74 wide. Eye diameters: AME 0.11, ALE 0.05, PME 0.07, PLE 0.08. Eye inter-distances: AME-AME 0.12, AME-ALE 0.04, ALE-PLE 0.22, PME-PME 0.22, PME-PLE 0.19, AME-PME 0.13. Carapace long and narrow, reddish-brown, with strong constriction between cephalic and thoracic regions, lateral margin with two moderate constrictions, anterior margin truncated, covered with feathery hairs reinforced on ides and anteriorly ( Fig. 19B, C). Endites and labium reddish-brown. Chelicerae reddish-brown, three promarginal teeth of different sizes and two retromarginal teeth equal and equidistant. Sternum reddish-brown, elongate and narrower between legs III and IV ( Fig. 19C). Abdomen pear-shaped, with dorsal scute reddish-brown, covered by feathery hairs. Ventral scute quadrangular-shaped. Tracheal scute present. Only coxa II translucent white. Coxa I light brown, coxae III and IV brown ( Fig. 19C). Femur I yellowish-brown, with one brown line dorsally and one ventrally, patella I yellowish-brown, with one promarginal and retromarginal line, tibia I, metatarsus I and tarsus I brown. Femur II brown, with two black ventrolateral lines, patella II brown, tibia II brownish-black proximally and brown distally, metatarsus and tarsus II brown. Legs III and IV brown, with patella white ventrally. Leg measurements: I—femur 1.35 / tibia 1.30 / metatarsus 1.04; II—femur 1.46 / tibia 1.46 / metatarsus 1.26; III—femur 1.58 / tibia 1.24 / metatarsus 1.27; IV—femur 2.45 / tibia 1.76 / metatarsos 1.86. Spination: Spination: I-femur do 0-0-1-1, pl 0-0-0-1,; tibia ve 2-2-2 (3-3); metatarsus ve 2-2/ II-femur do 1-0-0-1, pl 0-1-0-0, rl 0-1-0-0; 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. Palp without RTA; globose genital bulb drawn into moderately long neck ending in long, straight embolus. Base of embolus with retroapical elevation ( Fig. 19G, H).

Female (paratype). Total length 6.46. Carapace 4.13 long, 1.45 wide. Sternum 1.90 long, 0.62 wide. Abdomen 1.94 long, 1.82 wide. Eye diameters: AME 0.11, ALE 0.05, PME 0.07, PLE 0.08. Eye inter-distances: AME-AME 0.11, AME-ALE 0.07, ALE-PLE 0.19, PME-PME 0.24, PME-PLE 0.21, AME-PME 0.14. Carapace, endites, labium and chelicerae as in male. Abdomen pear-shaped, dorsal scute reddish-brown, nearly complete, covered in feathery hairs. Ventral scute absent, tracheal scute present. Only coxa II translucent white. Coxa I light brown, coxae III and IV brown. Femur I yellowish-brown with one line brown dorsally and one ventrally, patella I yellowish-brown, with one promarginal and retromarginal line, tibia I, metatarsus I and tarsus I brown. Femur II brown, with two black ventrolateral lines, patella II brown, tibia II proximally brownish-black and distally brown, metatarsus and tarsus II brownish-black. Legs III and IV brownish-black, with patella white ventrally. Leg measurements: I—femur 1.84 / tibia 1.93 / metatarsus 1.43; II—femur 1.69 / tibia 1.66 / metatarsus 1.37; II—femur 1.67 / tibia 1.35 / metatarsus 1.50; IV—femur 2.90 / tibia 1.89 / metatarsus 2.27. Spination: I-femur do 0-0-1-1, pl 0-0-0-1,; tibia ve 2-2-2 (3-3); metatarsus ve 2-2/ II-femur do 1-0-0-1, pl 0-1-0-0, rl 0-1-0-0; 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 elevated, epigynal transverse ridge procurved, with small marginal sclerotized area ( Fig. 19I, J).

Other material. BRAZIL: Pará, Belém, Campus de Pesquisa do Museu Paraense Emílio Goeldi [01°27’00.2’’S, 48°26’42.5’’W], 1♀, IX.2008, D.F. Candiani leg. ( MPEG ( ARA)-022497) .

Distribution. Known only from the type locality ( Fig. 25).