Megalostrata depicta
Creators: name: Bonaldo, Alexandre B.
name: Galán-Sanchez, M. Antonio
name: García, Fabián
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Corinnidae
Megalostrata
Megalostrata depicta

description: Megalostrata depicta (O. Pickard-Cambridge, 1895)
Figs 1B, 3C, D, 4, 5, 6
Delozeugma depictum O. Pickard-Cambridge, 1895: 145, pl. 19, fig. 1 (♂ from Teapa, Tabasco, Mexico, deposited in The Natural History Museum, London 1901.3.3.164, not re-examined).
Megalostrata depicta; Simon 1897: 192, fig. 200, 203; Bonaldo 2000: 119, fig. 310–311.
Diagnosis. Males of M. depicta resemble those of M. raptor by the rounded, smooth apical tegular process, differing by the embolus retro-apically oriented (oriented retro-basally in M. raptor, Bonaldo 2000, fig. 304) and by having a bifid RTA (entire in M. raptor, Bonaldo 2000, fig. 305). They share with M. paludosa spec. nov. a retro-apically oriented embolus but can be distinguished by the smooth apical tegular process (with a field of apical teeth in M. paludosa, Fig. 22A) and by the bifid RTA (entire in M. paludosa, Fig. 22A) (Figs 3C, D; Bonaldo 2000, figs 310–311). Females are similar to those of both M. raptor and M. pacifica spec. nov. by the elongated, tube-shaped secondary spermathecae, but can be distinguished from the former by the oblique orientation of the secondary spermathecae (oriented longitudinally in M. pacifica spec. nov., Figs 8A, B) and from the latter by the posterior atrium ill-defined, without a transversal anterior ridge at the level of the copulatory openings (Figs 5A, B, 6A–D) (posterior atrium defined by a transversal anterior ridge at the level of the copulatory openings in M. raptor, see Bonaldo 2000: fig. 308).
Description. Male. See Bonaldo (2000: 119). Additional documentation: Figs 1B, 3C, D, 4A, C. Female (UNAM) Carapace yellowish-orange, with marginal reddish-brown stripes and two wide paramedian reddish-brown stripes; cephalic region with two additional similarly colored bands, aligned with PME, fovea dark brown. Chelicerae, labium, and endites reddish-brown. Sternum yellowish-white, shield-shaped, with round setae bases. Legs yellowish-orange. Abdomen dorsum yellowish-white, with wide dark continuous stripes on each side, merging posteriorly; medially with three pairs of black spots. Total length 9.400. Carapace 4.338 long, 3.407 wide. Clypeus height 0.201. Eye diameters: AME 0.300, ALE 0.251, PME 0.213, PLE 0.194. Interocular distances: AME-AME 0.260, AME-ALE 0.198, PME-PME 0.259, PME-PLE: 0.284 ALE-PLE 0.068. Chelicerae 1.833 long, 1.100 wide, with three promarginal and two retromarginal teeth. Sternum 2.139 long, 1.973 wide. Leg measurements: I—4.474, 1.100, 3.975, 4.625, 1.256, 15.430; II—3.936, 1.333, 3.758, 3.313, 1.550, 13.890; III—3.920, 1.352, 3.277, 2.638, 1.240, 13.427; IV—4.609, 1.290, 4.122, 4.620, 1.307, 15.948. Leg spination: I—femur d1-2-2, p0-1-0; tibia p1-1, r1-1; metatarsus v1-1-1-1-1. II—femur d1-2-2; tibia p1-1, r1-1; metatarsus v1-1-1-1-1. III—femur d1-1-1, p0-1-1; tibia p1-1; metatarsus d2-2-2, v1-1-1, p1-1-1, r1-1-1. IV—femur v0, d2-1-1-1, r1-1; tibia p1-1, r1-1; metatarsus d2-2-0, r1-1 Leg spination: I—missing. II—femur d1-2-2; tibia p1-1, r1-1; metatarsus v1-1-1-1-1. III—femur d1- 1-1, p0-1-1; tibia p1-1; metatarsus d2-2-2, v1-1-1, p1-1-1, r1-1-1. IV—femur v0, d2-2-1-1, r1-1; tibia p1-1, r1- 1; metatarsus d2-2-1, r1-1. Abdomen 5.012 long, 1.946 wide. Epigynum. Epigynal plate oval, anterior portion with shallow median depression; posterior atrium borders ill-defined, transversal anterior ridge absent; posterior margin of epigynal plate without median invagination; margin of posterior plate excavation slightly procurved in posterior view; copulatory openings large, exposed on epigynal plate surface. Copulatory ducts short, straight, oriented transversally; secondary spermathecae elongated, tube-shaped, oriented obliquely; primary spermathecae globular, positioned posteriorly to copulatory openings, diameter approximately equal to atrium height; fertilization ducts directed posteriorly (Figs 5, 6).
Variation. (5 ♀) total 9.530 –11.270. Carapace 4.030 –4.450 long, 3.430 –3.650 wide. Leg I—4.110–4.410, 1.500–1.800, 4.300–4.350, 2.750–3.200, 1.270–1.564.
Additional material examined. MEXICO: Veracruz, San Andrés Tuxtla, Estacion Los Tuxtlas [18°34’55.2”N 95°04’30.0”W], leg. F. Alvarez-Padilla et al., 20–27.IX.2017, 3 ♂, 7 ♀ (UNAM); Same locality (18°21’04.0”N 95°02’35.0”W), leg. A.M. Girotti et al., 18–31.VII.2014, 1 ♀ (IBSP 226286); Same locality (18°35’13.8’’N, 95°04’31.8’’W), leg. L.S. Carvalho, 18–31.VII.2014, 1 ♂ (CHNUFPI 1485).
Distribution. Southeast Mexico (Fig. 25).
description: Published as part of Bonaldo, Alexandre B., Galán-Sanchez, M. Antonio & García, Fabián, 2024, Advances on the taxonomy of Megalostrata Karsch, 1880 (Araneae, Corinnidae, Corinninae), with descriptions of two new species, pp. 495-523 in Zootaxa 5458 (4) on pages 501-504, DOI: 10.11646/zootaxa.5458.4.2, http://zenodo.org/record/11547908