Chibchea amapa Huber & Carvalho

Huber, Bernhard A. & Carvalho, Leonardo S., 2019, Filling the gaps: descriptions of unnamed species included in the latest molecular phylogeny of Pholcidae (Araneae), Zootaxa 4546 (1), pp. 1-96: 43-45

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Chibchea amapa Huber & Carvalho

sp. n.

Chibchea amapa Huber & Carvalho  sp. n.

Figs 148–149View FIGURES 148–153, 154–156, 158, 161View FIGURES 154–155View FIGURES 156–163, 166View FIGURES 164–168, 169–172View FIGURES 169–176, 189–190View FIGURES 189–197

Gen.n. Br16-50: Eberle et al. 2018 (molecular data); Huber et al. 2018: fig. 3.

Type material. BRAZIL: ♂ holotype  , 1♀ paratype, UFMG (22732–33), 1♂ paratype, CHNUFPI (2482), and 3♂ 5♀ 4 juvs paratypes, ZFMK (Ar 20626), Amapá, Santana, forest SW Macapá , ‘site 4’, near road AP-010 (0.057°S, 51.234°W), 25 m a.s.l., 13.x.2016 (B.A. Huber, L.S. Carvalho)GoogleMaps  .

Other material examined. BRAZIL: 2♀, ZFMK (Br 16-252)  ; 1♀, CHNUFPI (2491); and 1♂ 1♀, UFMG (21788–89), all in pure ethanol, same data as types  . 1♂, CHNUFPI (2487); 4♂, 5♀, 4 juvs, CHNUFPI (2493); 1♀, CHNUFPI (2494); 2♂ 6♀, UFMG (21844); 3♂ 8♀ 2 juvs, ZFMK (Ar 20627); and 4♀ 2 juvs in pure ethanol, ZFMK (Br 16-253), Amapá, Mazagão, forest SW Macapá , ‘site 3’, near road AP-010 (0.138°S, 51.367°W), 25 m a.s.l., 13.x.2016 (B.A. Huber, L.S. Carvalho)GoogleMaps  .

Etymology. The species name is derived from the type locality; noun in apposition.

Diagnosis. Distinguished from most similar known congeners ( C. valle  , C. santosi  , C. hamadae  ) by shapes of procursus and bulbal apophysis ( Figs 158, 161View FIGURES 156–163; subdistal ventral sclerite on bulbal process very similar to C. valle  but longer; dorsal membranous process smaller than in C. valle  and C. santosi  ; procursus distally bifid as in C. valle  ), by large rounded process proximally on male palpal femur ( Fig. 155View FIGURES 154–155), and by external and internal female genitalia ( Figs 166View FIGURES 164–168, 171–172View FIGURES 169–176; epigynal plate with pair of distinct processes; round pore plates close together; female of C. valle  unknown).

Description. Male (holotype). MEASUREMENTS. Total length 1.6, carapace width 0.70. Distance PME-PME 70 µm; diameter PME 70 µm; distance PME-ALE 60 µm; distance AME-AME 15 µm, diameter AME 20 µm. Leg 1: 12.7 (2.9 + 0.3 + 3.2 + 5.4 + 0.9), tibia 2: 1.9, tibia 3: 1.7, tibia 4: 2.1; tibia 1 L/d: 58.

COLOR (in ethanol). Carapace pale ochre-yellow with brown median mark including ocular area (except medially) and brown lateral marginal bands; clypeus with pair of brown marks below eye triads; sternum brown; legs light brown, tips of tibiae whitish; abdomen pale greenish to blueish gray with blueish marks dorsally and laterally, ventrally with light brown mark in gonopore area and blueish band between gonopore and spinnerets.

BODY. Habitus as in Fig. 148View FIGURES 148–153. Ocular area slightly elevated. Thoracic furrow present. Clypeus unmodified. Sternum wider than long (0.54/0.32), unmodified.

CHELICERAE. As in Fig. 156View FIGURES 156–163, barely modified, with pair of indistinct processes on fangs.

PALPS. As in Figs 154–155View FIGURES 154–155; coxa with small retrolateral apophysis, trochanter barely modified, femur with large retrolateral-ventral process proximally and rounded unsclerotized projection distally; procursus simple, distally bifid ( Fig. 158View FIGURES 156–163); bulbal process with slightly serrated ventral sclerite, thin distal sclerotized process, and membranous dorsal process ( Fig. 161View FIGURES 156–163).

LEGS. Without spines and curved hairs, few vertical hairs; retrolateral trichobothrium of tibia 1 at 10%; tibia 1 without prolateral trichobothrium (present on other tibiae); tarsus 1 with ~25 pseudosegments, distally quite distinct.

Male (variation). Tibia 1 in 14 other males: 2.6–3.6 (mean 3.0).

Female. In general similar to male ( Fig. 149View FIGURES 148–153) but cheliceral fangs unmodified. Tibia 1 in 23 females: 2.1–2.8 (mean 2.4). Epigynum anterior plate rectangular with distinctive pair of posterior processes ( Figs 171View FIGURES 169–176, 190View FIGURES 189–197), shallow pockets (rather sclerotized furrows) in front of anterior plate ( Fig. 166View FIGURES 164–168); posterior plate short and simple, weakly sclerotized. Internal genitalia with pair of round pore plates close together ( Figs 166View FIGURES 164–168, 172View FIGURES 169–176).

Distribution. Known from two neighboring localities in Amapá, Brazil ( Fig. 346View FIGURE 346).

Natural history. This species was found in small holes in the ground under the leaf litter. It built tiny webs and ran away quickly when disturbed. At the type locality it was highly abundant: in one case, about 20 specimens were counted within 0.5 m 2. One egg-sac contained 10 eggs.