Ummidia mercedesburnsae, Godwin & Bond, 2021

Godwin, Rebecca L. & Bond, Jason E., 2021, Taxonomic revision of the New World members of the trapdoor spider genus Ummidia Thorell (Araneae, Mygalomorphae, Halonoproctidae), ZooKeys 1027, pp. 1-165 : 1

Ummidia mercedesburnsae sp. nov. Figs 24 , 25 , Map 4

Type material.

HOLOTYPE: 1 ♂ (UMM162) from 2mi E of Nickel Creek Station, Culberson County, Texas, United States, 31.8945 -104.6331 6, 1332 m a.s.l., 2.ix.1952, coll. B Malkin, AMNH. PARATYPE: 1 ♀ (UMM644) from Limpia Creek, 10mi N Fort Davis, 30.7368 -103.8969 6, 1689 m a.s.l., 28.viii.1971, J Bull, AMNH.

Etymology.

The specific epithet is a patronym in honor of Dr. Mercedes Burns the first female African American arachnologist (to our knowledge).

Diagnosis.

Ummidia mercedesburnsae can be differentiated from U. rosillos by the lack of a pale dorsal heart patch and brush on the retrolateral face of tarsus IV. Males can be differentiated from U. rosillos , U. modesta , U. timcotai , U. gabrieli , and U. rodeo by having an embolus with an even curve and from U. paulacushingae , U. waunekaae , U. gertschi , U. timcotai , and U. rodeo by having relatively fewer spines on the retrolateral face of tibia I. Females can be differentiated from all other geographically proximate species except U. modesta by having spermathecae with strong medial bend. Males disperse in August.

Description of male holotype.

Specimen preparation and condition. Specimen preserved in 80% EtOH. Specimen with a number of leg articles removed, in vial with specimen. General coloration. Carapace and chelicerae reddish black 2.5YR 2.5/1, legs dark reddish brown 5YR 3/3. Abdomen dark grayish brown 10YR 4/2. Cephalothorax. Carapace 5.04 long, 4.95 wide. Pars cephalica 3.39 long. Foveal groove procurved, 0.39 long, 1.01 wide. All eyes on moderate tubercle. AER procurved. PER straight. Eye group 0.74 long, 1.25 wide, AME 0.36, PME 0.24, ALE 0.39, PLE 0.27. Sternum sparsely setose anteriorly with posterior fringe, STRl 2.94, STRw 3.02. Chelicerae with anterior tooth row comprising three teeth, posterior margin with three teeth. Palpal endites with 15 long, thin cuspules over proximal half of endite face, lacking distal endite cuspules, ENDw 1.24, ENDl 2.12. Labium with five long, thin cuspules, LBw 1.13, LBl 0.79. Rastellum with many spines on process. Abdomen setose. Legs. F1 4.92; F1w 1.24; P1 2.36; Ti1 3.09; Mt1 2.13; Tr1 1.01; F3 3.41; F3w 1.5; P3 1.84; Ti3 1.97; Sd3 1.07; Mt3 1.92; Tr3 1.44; F4 4.54; F4w 1.44; P4 2.1; Ti4 2.94; Mt4 2.98; Tr4 1.49. Retrolateral face of tarsus IV with indistinct comb. Leg I spination pattern: TSp 3, TSpv 4, TSrd 0, TSr 0, TSrv 14, MtSp 3, MtSr 11, TrSp 4, TrSr 6. Pedipalps. PTl 2.93, PTw 1.18, Bl 2.43. Embolus evenly curved.

Description of female paratype.

Specimen preparation and condition. Specimen preserved in 80% EtOH. Spermathecae removed, cleared, in vial with specimen. General coloration. Carapace, chelicerae, and legs dark reddish brown 2.5YR 2.5/4. Abdomen black 5YR 2.5/1, spinnerets dark reddish brown 2.5YR 2.5/2. Cephalothorax. Carapace 6.5 long, 6.15 wide. Pars cephalica 4.51 long. Foveal groove procurved, 0.64 long, 1.51 wide. Eye tubercle low. AER procurved. PER straight. Eye group 0.96 long, 1.67 wide, AME 0.37, PME 0.3, ALE 0.54, PLE 0.38. Sternum sparsely setose around edges, thicker anteriorly, STRl 3.95, STRw 4.19. Chelicerae with anterior row comprising six teeth, posterior margin with five teeth. Palpal endites with 27 cuspules spread across proximal half of endite and 40 cuspules distally, equal in size to proximal cuspules anteriorly, smaller posteriorly, ENDw 1.68, ENDl 2.78. Labium with six cuspules, LBw 1.64, LBl 1.12. Rastellum with many strong spines on process and up cheliceral face. Abdomen. Legs. F1 4.29; F1w 1.58; P1 2.69; Ti1 2.64; Mt1 1.92; Tr1 0.9; F3 3.67; F3w 1.96; P3 2.3; Ti3 2.08, Sd3 1.11; Mt3 1.69; Tr3 1.63; F4 4.36; F4w 1.93; P4 2.38; Ti4 2.52; Mt4 2.65; Tr4 2.52. Retrolateral face tarsus IV with defined tight comb over length of tarsus. Pedipalps. PF 3.83, PP 2.25, PTi 2.38, PTr 2.17. Spermathecae with medial bend, bulbs facing anteriorly.

Known only from type material.

Figures

Map 4. Locality records for western United States and northern Mexico species.

Figure 24. Ummidia mercedesburnsae sp. nov. from Culberson Co., Texas. A male habitus illustration UMM 162 B female habitus illustration UMM 644. Scale bars: 4.0 mm.

Figure 25. Ummidia mercedesburnsae sp. nov. from Culberson Co., Texas. A-D male holotype (UMM 162) A prolateral aspect, leg I B retrolateral aspect, leg I C line drawings, leg I prolateral and retrolateral aspects D retrolateral aspect, pedipalp E cleared spermathecae female paratype (UMM 644). Scale bars: 1.0 mm.