Chibchea amapa Huber & Carvalho 2019, sp. n.
Creators: name: Huber, Bernhard A.
name: Carvalho, Leonardo S.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Pholcidae
Chibchea
Chibchea amapa

description: Chibchea amapa Huber & Carvalho sp. n.
Figs 148–149, 154–156, 158, 161, 166, 169–172, 189–190
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).
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).
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, 161; 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. 155), and by external and internal female genitalia (Figs 166, 171–172; 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. 148. Ocular area slightly elevated. Thoracic furrow present. Clypeus unmodified. Sternum wider than long (0.54/0.32), unmodified.
CHELICERAE. As in Fig. 156, barely modified, with pair of indistinct processes on fangs.
PALPS. As in Figs 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. 158); bulbal process with slightly serrated ventral sclerite, thin distal sclerotized process, and membranous dorsal process (Fig. 161).
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. 149) 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 171, 190), shallow pockets (rather sclerotized furrows) in front of anterior plate (Fig. 166); posterior plate short and simple, weakly sclerotized. Internal genitalia with pair of round pore plates close together (Figs 166, 172).
Distribution. Known from two neighboring localities in Amapá, Brazil (Fig. 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.
description: Published as part of Huber, Bernhard A. & Carvalho, Leonardo S., 2019, Filling the gaps: descriptions of unnamed species included in the latest molecular phylogeny of Pholcidae (Araneae), pp. 1-96 in Zootaxa 4546 (1) on pages 43-45, DOI: 10.11646/zootaxa.4546.1.1, http://zenodo.org/record/2619020