Chrysometa xamaticpac, Salgueiro-Sepúlveda & Álvarez-Padilla, 2018

Salgueiro-Sepúlveda, F. Javier & Álvarez-Padilla, Fernando, 2018, New species of the orb-weaving spider genus Chrysometa (Araneae, Tetragnathidae) from oak forests near of the Pico de Orizaba National Park (Veracruz, Mexico), Zootaxa 4450 (3), pp. 301-330 : 314-316

publication ID

https://doi.org/ 10.11646/zootaxa.4450.3.1

publication LSID

lsid:zoobank.org:pub:942E45D3-2BA4-418E-A531-165CA2D7C7BF

DOI

https://doi.org/10.5281/zenodo.5991670

persistent identifier

https://treatment.plazi.org/id/CE389E60-6F6D-0679-FF30-FBE42C6EC3C6

treatment provided by

Plazi

scientific name

Chrysometa xamaticpac
status

sp. nov.

Chrysometa xamaticpac View in CoL new species

Figures 9 View FIGURE 9 , 10 View FIGURE 10 , 19 View FIGURE 19

Type material. Holotype ( CNAN-T1187 ). Female from Pico de Orizaba National Park , Xamaticpac, Calcahualco, Veracruz, Mexico. Plot II: 19° 7' 32.5" N, 97° 4' 3.2" W, 1,700 m GoogleMaps . April 19–27, 2013. Allotype ( CNAN-T1188 ). Male from same locality. Paratypes. Four females and nine males. Types are deposited in the Colección Nacional de Arácnidos ( CNAN) at the Instituto de Biología ( IBUNAM). GoogleMaps

Etymology. The species epithet is a noun in apposition and refers to the type locality.

Diagnosis. Females of C. xamaticpac can be distinguished from all sympatric species by the following features: epigynum transverse bar very short with small and thin arms and protruding over the septum ( Figs. 9D View FIGURE 9 , 10D View FIGURE 10 ). Males of C. xamaticpac are distinguished by the following features: large and thin embolus, Ç-shaped paracymbium in ventral view with a very short lower prong with a square tip ( Figs. 9I View FIGURE 9 , 10A, B, C View FIGURE 10 ).

Description. Female. Total length 4. Cephalothorax: length 2, width 1.5. Carapace pale-yellow, dark-yellow pattern over the cephalic region narrowing towards the fovea ( Fig. 9A View FIGURE 9 ). Ocular area pale-yellow. Eyes subequal in size ( Fig. 9G View FIGURE 9 ). AME diameter 0.1, PME 0.14, ALE and PLE 0.14. Chelicerae yellow, with few scattered setae ( Fig. 9G View FIGURE 9 ). Endites longer than wide, yellow, internal margins pale-yellow. Labium wider than long, dark brown, paleyellow on the posterior part. Sternum dark-yellow, wider between the first and second legs ( Fig. 9C View FIGURE 9 ). Abdomen: pale-brown, dorsally covered with small guanine silvery patches, with four transversal black lines ( Fig. 9A, B View FIGURE 9 ); ventrally dark-yellow, with two lines of guanine patches forming a central brown rectangle between the spinnerets and the epigynum, one yellow spot on each side of spinnerets ( Fig. 9C View FIGURE 9 ). Leg lengths: I 12, II 6.9, III 4 and IV 5.8. Legs pale-yellow, the first segments yellow, darker on joints, with ventral and dorsal black spots. Tarsi dark-brown. Epigynum: epigynal plate trapezoidal, wider than long; transverse bar very short, without arms and protruding over the septum. Septum with thick margins and well sclerotized. Copulatory openings small, not sclerotized ( Figs. 9D View FIGURE 9 , 10D View FIGURE 10 ). Spermathecae, copulatory ducts and fertilization ducts as shown in Figure 9E, F View FIGURE 9 .

Male. As in female except as noted. Total length 3.6. Cephalothorax: length 1.9, width 1.4. Carapace: dorsal coloration darker, pattern weaker. Eyes subequal in size. AME diameter 0.08, PME 0.1, ALE and PLE 0.11. Chelicerae dark-yellow, rugose, larger and narrower, setae bases enlarged and more abundant at base; retrolateral cuticle less rugose towards the apical surfaces ( Fig. 9H View FIGURE 9 ). Abdomen: dorsal and ventral coloration brighter than in female. Leg lengths: I 12, II 7.5, III 4.3 and IV 5.9. Pedipalp: CEBP triangular, curved anteriorly. CEMP small, rectangular and flattened, pointed retrolaterally. Paracymbium Ç-shaped in ventral view. Upper prong enlarged, wider than lower prong. Lower prong square and short. Embolus large and thin, tubular shape; EBA shorter than embolus and curved in apical region ( Figs. 9I View FIGURE 9 , 10A, B, C View FIGURE 10 ). Conductor, embolus and EBA in ventral view as in Figures 9I View FIGURE 9 , 10A View FIGURE 10 .

Variation. Female total length 3.8–4.5, cephalothorax length 1.6–2, cephalothorax width 1.2–1.5. Male total length 3.1–4.1, cephalothorax length 1.4–1.9, cephalothorax width 1.3–1.6. Females can vary in the pattern of the cephalic region and the dorsal surface of the abdomen. The external and internal epigynum can be more sclerotized and the transverse bar can present very short and thin arms.

Material examined. N=15. Mexico: Veracruz, Xamaticpac , Calcahualco. One female, ten males Plot II: 19° 7' 32.5" N, 97° 4' 3.2" W, 1,700 m., April 19–27, 2013. Two females Plot I: 19 7' 34.1" N, 97 4' 1.5" W, 1,710 m.; two females Plot II: 19 7' 32.5" N, 97 4' 3.2" W, 1,700 m., October 2–11, 2013. Colección Nacional de Arácnidos ( CNAN) at the Instituto de Biología ( IBUNAM) GoogleMaps .

Distribution. Veracruz, Mexico. Known only from the type locality ( Fig. 19 View FIGURE 19 ).

Biology. Specimens were collected in a Quercus forest with secondary plant growth. All specimens were found in both plots but only during the first and second expeditions (expedition I: May 21–30, 2012; expedition II: October 4–14, 2012). Most specimens were captured by direct collecting at night; only two were caught by beating vegetation.

IBUNAM

Instituto de BiIolog�a, Universidad Nacional Aut�noma de M�xico

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Tetragnathidae

Genus

Chrysometa

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