Speocolpodes, a New Genus of Troglobitic Beetles From Guatemala (Coleoptera:Carabidae)

Psyche: A Journal of Entomology, Sep 2018

Thomas C. Barr

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Speocolpodes, a New Genus of Troglobitic Beetles From Guatemala (Coleoptera:Carabidae)

International Journal of BY THOMAS C. BARR 0 0 School of Biol.ogical Sciences University of Kentucky Lexington , Kentucky , U. S. A. 40506 8PEOCOLPODE8, A NEW GENUS OF TROGLOBITIC BEETLES FROM GUATEMALA (COLEOPTERA: CARABIDAE In early January, I973, Mr. Henry Frania and Mr. Michael Shawcross visited Seamay Cave, Alta Verapaz, (]uatemala, .and discovered two specimens of a remarkable troglobitic carabid beetle. "One was collected after dusk running over flowstone near pools of water several hundred yards into the. cave. The second was found the next morning, less than 200 yards from the. entrance under a rock in a dry, silt-covered flowstone pool, but still well within the dark zone." (H. Frania, in litt.). Subsequently Mr. Frania referred the specimens to. me for study. The Seamay Cave beetle is of special interest for two reasons: ) It is the first troglobitic beetle known from Guatemala, and the cave is the farthest south of any troglobitic beetle, type locality in North America. 2) The beetle clearly belongs to the Agonini and in body form resembles the species o,f Rhadine LeConte, but the possession of long setae .on the underside of the tarsi and conspicuous lobes on the fourth tarsal segments indicates that its affinities lie. not with Rhadine but with the large, heterogeneous group of agonines currently placed in Colpodes NI'Leay. - D ecember at least at the subgeneric level because of the distinctive habitus of its component species. The Seamay Cave beetle does not appear to. be close to Mexisphodrus despite their cavernicolous habitats and despite their inclusion within the colpodines. In Mexisphodrus there are well-formed eyes or eye rudiments, the head is rounded, the pro.no.tuna is more or less cordiform with very bro.adly reflexed sides, the elytral humeri are well developed and prominent, and the color is dark violaceousferruginous. In the Seamay Cave beetle the eye rudiments are minute, the head is twice as long as wide .and its sides are subparallel, the pronotum is barrel-shaped, the elytral humeri are completely rounded, and the color is rufotestaceo.us. Speoeolpodes, new genus Slender, elo.ngate, rufo.testaceo.us cave beetles with minute vestiges of eyes and wings; front and middle tarsi witch penultimate segment deeply and asymmetrically bilobed; head twice .as long as wide, sides subparallel; pronotum widest at middle, hind angles blunt and obtuse. Integuments generally glabrous; microsculpture o.n dorsum of head obsolete, obsoletely transverse .on pronotal disc, finely and densely transverse on elytra. Eye rudiment visible only as minute, translucent spot beneath cuticle; labrum with anterior margin broadly convex, 6-setose; two clypeal setae; clypeofrontal groove joining postantennal groove and terminating in lunate depression between anterior and posterior supraorbital punctures. All mouthparts elongate and slender; mandibles falcate, right mandible with large tooth; maxillary palps with terminal segment fusifo.rm, a little shorter than penultimate segment; glossa with apex broadly rounded and bisetose; labial palps bisetose; mentum too.th grooved, truncate; two prebasilar setae each side of submentum behind suture. Pronotum barrel-shaped, longer than wide, widest at middle, apex slightly narrower than base; two pairs of marginal setae; hind angles obtuse and somewhat rounded, not produced. Metepisterna short, 3 as wide as long. Elytra elongate-elliptical, humeri completely rounded, subapical sinuation absent; scutellar stria very brief, obsolescent; scutellar puncture setiferous; two discal punctures in apical half, on third interval against second stria; umbilicate series 6 + 2 + 6, seventh and eighth punctures rather widely spaced; a single puncture near apex of seventh stria. Antenna very long and slender, .attaining apical ourth ot elytra; pubescence beginning near base of ourth segment. Tarsi with fir.st four segments densely setose beneath, last segment glabrous beneath, claws smooth; tourth segment bilobate, conspicuously so on pro- and mesotarsi, inner lobe longer than outer, ourth metatar.sal segment eebly b/lobate; two or three basal segments o meso-.and metatarsi with t:eeble lateral ridge. Male unknown. Type species:Sl)eocoiodes franiai, new species. Speoeolpodes franial, new species Etymology: Patronymic honoring Mr. Henry Frania, codiscoverer o( the species. Diagnosis" The genus is at present monobasic; the single species is distinguished rom all other known species o. North American Anchomeninae by the combination ot bilobed fourth tarsal segments, vestigial eyes, ru.otestaceous color, and slender, elongate body o.rm. Descril)tion: Length 9.5-o.2 mm. Ruotestaceous, shining, polished; integuments generally glabrous except or fixed setae; microsculpture obsolescent on do.rsum o.t head, evanescently transverse on pronotal disc, finely and densely transverse on elytral disc. Body orm slender and elongate, appendages .all slender and elongate. Head 2. times longer than wide (excluding mandibles), sides subparallel, ieebly convergent at neck; eye vestigial, represented only by minute rudiment seen as translucent spot through cuticle, about o.o9 X o. 5 mm. in ’holotype; labrum o.4 as long as wide, anterior margin evenly convex; clypeofrontal grooves short, divergent behind level ot .Intennal bases, joining eebly impressed postantennal groove at anterior suprao.rbital puncture and ending in lunate, depression between anterior and posterior suprao.rbitals; mandibles elongate, slender, alci(orm, left mandible .4o mm. long in holotype; maxillary palps with terminal segment usiorm, about o.85 as long ,as penultimate segment, total length o palp (holotype) .77 mm., segments in ratio o .o :4.o :3.6:3.o; labial palps with two setae on basal ha.li oi penultimate segment (distal seta possibly irregular: short or broken on two o our palps examined, absent o.n other two palps), total length o.t palp (holotype) x.23 ram., segments in ratio o 4 3; mentum tooth prominent, gro.oved, truncate at apex; submentum with two prebasilar setae each side behind suture. Pronotum .25 times longer than wide, apex width o..8 times base width and o.67 times maximum width, which occurs near middle; disc convex, a little deplanate toward .sides; anteri.or angles depressed, sides rounded but shallowly sinuate before middle and before hind angles, which are obtuse, moderately rounded and reflexed; base unmargined; marginal setae placed in margin, anterior pair at middle, posterior pair before hind angles. Prosternum slightly flattened along mid-line; posterior process truncate, but not very sharply so. Elytra 1.8 times longer than wide, humeri completely rounded, sides slightly sinuate in basal fourth, subapical sinuation obsolete; disc convex, striae deep and uninterrupted, intervals convex; scutellar stria very short, obsolescent; first stria either truncating or joining second stria at base, fourth and fifth striae joining in apical fourth and not attaining apex; scutellar puncture setose; two discal punctures on third interval touching second stria, anterior puncture, behind middle, posterior puncture in apical fifth; umbilicate series 6 + 2 + 6, spacing between punctures 6 through 9 wide. and a little irregular; whips apparently (some broken?) in punctures I, 9, and 13, but not excessively long; seventh stria with a single preapical puncture. Metathoracic wings vestigial, about 0.7 mm. long (holotype). Abdominal tergites pale, unpigmented, translucent (as in troglobitic Trechinae). Metepisterna short, anterior margin 0.75 as long as lateral margin. Appendages all slender and elongate. Antenna. 0.85 times total body length, first three segments glabrous, pubescence beginning at basal sixth of fourth segment; fourth segment one-third longer than third segment; beginning with .scape, segments in length ratio as follows: i..oo :.0.44 i.io 1.52 1.27 1.22 1.14 i.io i.oo 0.87 0.79 (holotype). Tarsus with f.ourth segment bilobate, inner lobe longer than outer, lobes prominent on pro.- and meso.tarsus but inconspicuous on metatarsus; first four segments with long setae beneath, fifth segment glabrous beneath; meso- and metatarsi with feeble ridge on outer .side of basal two. or three segments; total length of protarsus 1.2o ram. in holotype, segments in length ratio, of I.OO o.55 0.48 0.29 (excluding lobes) 1.55. Male unknown. Holotype: Female (American Museum of Natural History, New York), Seamay Cave, near Senah(1, Alta Verapaz, Guatemala, January 9, 1973, collected by Henry Frania. Approximate elevation 3ooo fett; approximate coordinates, of type locality as furnis’hed by Mr. Frania, 89 50’ X I5 23’. Paratype: Female, same locality, January 8, 1973, collected by Michael Shawcross. Deposited in T. C. Barr collection, University of Kentucky. Psyche [December Measurements of Holotype: total length 9.5 mm., head (excluding mandibles) 2.32 mm. long ) 1.o8 mm. wide, pronotum 1.95 mm. long X 1.55 mm. wide, elytra 5.53 ram. long X 2.99 mm. wide,. antenna, 8.13 ram. long. DISCUSSION Speocolpodes was presumably derived from a colpodine stock with eyes and wings, possibly from a troglophile ancestor which frequented moist, dark microhabitats. Its exact position among the hundreds of species of colpodines inhabiting Mexico and Central America is difficult if not impossible to determine until the taxonomy and phylogeny of the group is better understood. Seamay Cave, located on the Finca Seamay near Senah6, is one of three caves in which the catopine leiodid beetle Ptomaphagus giaquintoi Jeannel (I949) is known to occur (Peck, I97o). P. g’iaquintoi has small though prob.ably functional eyes and apparently functional metathoracic wings, and is at most a troglophile, even though it shows certain cave adaptations such as long a.ntennae. Although Peck visited Seamay Cave and collected P. giaquintoi there (in June and August), he did not find Speocolpodes in that cave or in nearby Cueva Sepacuite, the largest of three caves on Finca Sepacuite. It is conceivable that the carabids appear seasonally in the cave, and that concentrated search during January or February would yield more specimens. 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Thomas C. Barr. Speocolpodes, a New Genus of Troglobitic Beetles From Guatemala (Coleoptera:Carabidae), Psyche: A Journal of Entomology, DOI: 10.1155/1973/83417