Kryptochroma quadrata Machado & Viecelli & Guzati & Grismado & Teixeira 2021, gen. et sp. nov.
Creators: name: Machado, Miguel
name: Viecelli, Rafaela
name: Guzati, Catherine
name: Grismado, Cristian J.
name: Teixeira, Renato A.
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Thomisidae
Kryptochroma
Kryptochroma quadrata

description: Kryptochroma quadrata Machado & Viecelli gen. et sp. nov.
urn:lsid:zoobank.org:act: 6C2037C9-66B3-4B07-9102-E2BF009B8AC1
Figs 12–13, 18, 19B, 22B
Diagnosis
The male of K. quadrata sp. nov. resembles that of K. pentacantha by the shape and disposition of embolus (Figs 13C, E, 19B), however, it can be distinguished from that and other species of the genus by the rounded tegulum, which also presents a retrolateral reentrance, and by the squared-tipped RTA with remarkable grooved surface (Figs 13D, F, 19B). The females have an anterior longitudinal ruckle connected to a shallow and convex fold on the epigynal plate, with no median outgrowth, gutters or septum separating the copulatory openings (Figs 12C, E, 22B).
Etymology
The epithet – a Latin feminine adjective that means squared – is a direct reference to the shape of the RTA tip, which ends abruptly.
Material examined
Holotype BRAZIL • ♂; Amazonas, Coari, Porto Urucu, Base de Operações Geólogo Pedro de Moura; 4°53′42.5″ S, 65°11′18.2″ W; 28 Sep. 2006; C.A.C. Santos Jr. leg.; UFMG 22673.
Paratypes BRAZIL • 1 ♀; same collection data as for holotype; MPEG 22669 • 1 ♀; same locality as for preceding; 4°50′01″ S, 65°03′53″ W; 28 Sep. 2006; D. Guimarães leg.; UFMG 22673 • 1 ♀, same collection data as for preceding; Sep. 2006; D. Candiani leg.; MPEG 13297.
Additional material
None.
Description
Female (paratype, MPEG 13297)
PROSOMA. Anterior eye row strongly recurved and posterior procurve, ocular mounds discrete, not as elevated as in other species, carapace predominantly yellow, black on the sides, MS well developed (Fig. 12A–B). Chelicerae yellow with two pairs of dark stains, sternum slightly longer than wide, brown with a large yellow stain, endites and labium truncated and totally brown.
LEGS. Leg coloration pattern as in K. gigas gen. et sp. nov.
OPISTHOSOMA. Concave anterior border, predominantly yellow, dark-brown on sides and on the back of the abdominal projections (Fig. 12A). Spermathecae rounded and smooth surfaced (Fig. 12D, F).
MEASUREMENTS. Eye diameters and eye interdistances: AME 0.06, ALE 0.11, PME 0.08, PLE 0.08, AME–AME 0.12, AME–ALE 0.16, PME–PME 0.27, PME–PLE 0.09, MOQ length 0.48, MOQ width 0.51; leg formula: 1-2-4-3: leg I – femur 5.18/ patella 2.59/ tibiae 3.47/ metatarsus 2.07/ tarsus 1.39/ total 14.70; II – 4.14/ 2.33/ 2.84/ 1.81/ 1.29/ 9.57; III – 2.33/ 1.29/ 2.07/ 1.03/ 0.88/ 7.60; IV – 2.90/ 1.29/ 1.91/ 1.24/ 0.93/ 8.27. Total body length 7.25; carapace 3.50 length, 3.37 wide; opisthosoma
length 3.75; clypeus 0.32 height; sternum 1.53 length, 1.29 width; endites 0.80 length, 0.40 width; labium 0.56 length, 0.58 width.
Male (holotype, MPEG 22673)
PROSOMA. Anterior eye row very recurved, posterior procurved, ALE with almost two times the size of AME; carapace knobby, predominantly light brown with its median region, clypeus and posterior slope scars yellowish; medial spire absent (Fig. 13A–B). Sternum scutiform, light brown with a median white stain.
LEGS. Anterior legs light brown with some darker taints while legs III and IV are lighter, with extensive whitish areas; anterior femora enlarged, with dorsolateral setiferous tubercles randomly distributed and ventral region dark-brown; tibia I and II with four pairs of ventral macrosetae and anterior metatarsi with three pairs (Fig. 13A).
OPISTHOSOMA. Predominantly pale yellow with small white punctuations and posterior black spots; straight anterior border and five short spiniform projections.
MEASUREMENTS. Eye diameters and eye interdistances: AME 0.06, ALE 0.08, PME 0.06, PLE 0.06, AME– AME 0.06, AME–ALE 0.08, PME–PME 0.16, PME–PLE 0.06, MOQ length 0.29, MOQ width 0.32; leg formula: 1-2-4-3: leg I – femur 2.23/ patella 1.24/ tibiae 1.33/ metatarsus 0.88/ tarsus 0.56/ total 6.24; II –
1.45/ 0.72/ 1.04/ 0.72/ 0.50/ 4.43; III – 0.87/ 0.48/ 0.80/ 0.45/ 0.37/ 2.97; IV – 1.12/ 0.48/ 0.80/ 0.56/ 0.40/ 3.36. Total body length 4.61; carapace 2.28 length, 2.18 width; opisthosoma length 2.33; clypeus 0.24 height; sternum 0.83 length, 0.72 width; endites 0.40 length, 0.24 width; labium 0.20 length, 0.32 width.
Distribution
Brazil (Amazonas) (Fig. 18).
description: Published as part of Machado, Miguel, Viecelli, Rafaela, Guzati, Catherine, Grismado, Cristian J. & Teixeira, Renato A., 2021, Kryptochroma: a new genus of bark-dwelling crab spiders (Araneae, Thomisidae), pp. 26-70 in European Journal of Taxonomy 778 on pages 48-51, DOI: 10.5852/ejt.2021.778.1565, http://zenodo.org/record/5673850