Diastolinus chalumeaui Hart and Ivie, 2016

Hart, Charles J. & Ivie, Michael A., 2016, A Revision of the Genus Diastolinus Mulsant and Rey (Coleoptera: Tenebrionidae), The Coleopterists Bulletin 70 (3), pp. 485-540 : 485-540

Diastolinus chalumeaui Hart and Ivie , new species

( Figs. 8–11 , 106 )

Diastolinus perforatus ; Mulsant and Rey 1859: 77, 1860: 141 (in part, Guadeloupe records only); Fleutiaux and Sallé 1889: 421 (Terre-de-Haut, as Le Saintes); Blackwelder 1945: 524 (in part, Guadeloupe records only); Marcuzzi 1957:128 (in part, Guadeloupe records only), 1962: 27 (in part, Guadeloupe, records only), 1977: 19 (in part, Les Saintes, La Désirade, Guadeloupe, records only), 1984: 78 (in part, Guadeloupe records only); 2001: 249 (in part, Guadeloupe records only); Marcuzzi and D’ Aguilar 1971: 80 (in part, Guadeloupe, Les Saintes records only); Chalumeau 1982: 192 (Marie-Galante); Peck 2011a: 33 (in part, Guadelouple, Les Saintes, La Désirade, Marie- Galante records only), 2011b: 29 (in part, Guadelouple, Les Saintes, La Désirade, Marie- Galante records only), 2016: 160 (in part, Guadelouple, Les Saintes, La Désirade, Marie- Galante records only); Peck et al. 2014: 84 (in part, Guadelouple, Les Saintes, La Désirade, Marie-Galante records only); Soldati and Touroult 2014: 99 (in part, Guadelouple, Les Saintes, La Désirade, Marie-Galante records only).

Diastolinus sallei ; Leng and Mutchler 1914: 460 (in part, Guadeloupe records only); Marcuzzi 1957: 128 (in part, Dominica records only), 1962: 25 (in part, Dominica records only), 1977: 22 (in part, La Désirade, Dominica records only), 1984: 78 (in part, Dominica records only); Peck 2006: 189 (in part, Dominica records only), 2011a: 33 (in part, Dominica, La Désirade records only), 2016: 160 (in part, Dominica, La Désirade records only); Peck et al. 2014: 84 (in part, Dominica, La Désirade records only); Soldati and Touroult 2014: 99 (in part, Dominica, La Désirade records only).

Diastolinus puncticollis Marcuzzi 1977: 22 (in part, Marie-Galante records only); Peck 2011a: 33 (in part, Marie-Galante records only), 2016: 160 (in part, Marie-Galante records only); Peck et al. 2014: 84 (in part, Marie- Galante records only).

Diastolinus sp. ; Marcuzzi 1983: 246 (male genitalia, La Désirade).

Type Material. HOLOTYPE: Male. GUADELOUPE: Gran-Terre ; Anse de Tarare, 0–20m; 16° 15.242′N, 61° 11.901′W; 20 AUG 2005, M.A. Ivie; coastal scrub/ WIBF 035582 (from WIBF, deposited in NMNH) . PARATYPES (18 specimens): 5 females and 10 males sharing the same label data as the holoytype ( WIBF 035386 – 035387 , WIBF 035583 – 035595 ). Guadeloupe; Anse-à-l′ Eau/ 11.2.78; F. Chalumeau (1 female and 2 males, WIBF 036172 – 036174, from HNHM) .

Other Material Examined. See Appendix 1.

Etymology. This species is named for Fortuné Chalumeau, who collected many examples of this new species and provided extensive assistance to MAI on all manner of things relating to West Indian Coleoptera .

Diagnosis. This species can be distinguished by the combination of the base of the pronotum subequal to width across the humeri, matte dorsal surface, dorsal surface without apparent setae, gracile legs with a narrow metatarsus, tarsomere 1 more than 2X length of tarsomere 2, regularly, finely punctate abdominal ventrites, abdominal ventrites 2 and 3 with a row of distinct heavy punctures at the anterior edge of the ventrite, and male genitalia with the parameres slightly widened from the base then broadly rounded distally.

Description. Male. Length 7.0– 8.1 mm, width 3.0– 3.7 mm. Body ( Fig. 8 ) black, except antennae typically pitchy red, last 3 antennomeres mostly testaceous; matte surface; ovate-oblong; widest at middle, convex; dorsal surface sparsely setose, ventral surfaces covered in very short, light colored setae.

Head with epistoma evenly convex; punctures less than diameter of ommatidium, covering dorsal surface, separated by 1–2X puncture diameter except spaced less than 1X puncture diameter on anterior margin. Labrum densely punctate. Antenna clavate. Dorsal and ventral portions of eye roughly equal in size, dorsal portion perfectly circular, ventral portion somewhat ovate. Gular horns short, not prominent.

Pronotum ( Fig. 8 ) widened posteriorly; apical margin evenly, broadly emarginate; apical corners rounded, lateral margin widened from apex in anterior 2/5, then sides subparallel to base; basal width subequal to width across humeri; basal margin bisinuate; dorsal surface broadly, evenly convex; all margins narrowly beaded, except obsolete at middle of anterior margin; finely punctate, puncture diameter 1/2 that of punctures on head, spaced 2–3X puncture diameter on pronotal disc. Hypomeron rugulose, almost impunctate. Prosternal process lanceolate, shallowly punctate, rarely with pale, semi-erect setae 2X longer than puncture diameter.

Scutellum ( Fig. 8 ) small, rounded, about 2X wider than long. Elytron ( Fig. 8 ) gradually broadening from base to widest point opposite abdominal ventrite 1, then evenly arcuate to apices; striae impressed; strial punctures deep, not confluent; intervals broadly convex, punctation minute, even. Stria 7 ending in lateral stria slightly posterior to humeral angle.

Mesoventrite weakly rugulose, shallowly punctate. Metaventrite short, anterior border punctate behind mesocoxae.

Leg surfaces finely punctate. Femora somewhat clavate; profemur expanded. Protibia narrow, expanding gradually in distal 3/4; dorsolateral margin slightly arcuate; posteroventral surface with stout spines in apical 2/3; apex obliquely truncate, ringed by stout spines. Pro- and metatarsi with tarsomeres 1–3 expanded, ventrally with golden, densely setose pads, tarsomere 2 widest, more than 1.5X width of tarsomere 4. Mesotarsus with tarsomeres 1–3 weakly expanded, ventrally with densely setose pads. Metatarsus narrow, about 3/4 as long as metatibia, without setose pads; 1 st tarsomere more than 2X length of 2 nd.

Abdominal ventrites ( Fig. 9 ) finely, evenly punctate; ventrites 1–3 slightly concave or flattened medially; anterior border of ventrite 1, just behind hind coxae, with row of heavy punctures; ventrites 2–3 with row of punctures at anterior border of ventrite, not apparent mesally, weak longitudinal strioles sometimes follow; ventrite 5 flattened medially, finely punctate, posterior margin evenly rounded. Aedeagus ( Figs. 10, 11 ) with basal piece and parameres strongly arched, slightly less than 1/2 elytral length; parameres widened slightly from base, broadly, evenly rounded just before apex, apical margin rounded not straight; parameres with slightly sinuate lateral margin, with upturned tips in lateral view.

Female. Length 7.0– 8.7 mm, width 3.2–4.0 mm. Similar to male except body more robust and convex than male. Pro- and mesotarsi not expanded. Abdominal ventrites 1–3 convex; ventrite 5 slightly convex.

Biology. Adults have been recorded from coastal scrub, under stones, and from sandwashing. It has been found from sea level to 20 m elevation.

Distribution. Basse-Terre, Grande Terre, Ilet de Pigeon* (HNHM, OSUC), Terre-de-Haut, La Désirade, Petite-Terre* (OSUC), Marie-Galante, Dominica ( Fig. 106 ).

Discussion. As shown in the synonymical tables, although there is an extensive literature referring to this species, all are misidentifications, and the species lacks a valid name. None of the three species names with records for Guadeloupe and Dominica actually occur on these islands.

Diastolinus chalumeaui Hart and Ivie

GUADELOUPE: Gran-Terre ; Anse de Tarare, 0– 20m; 16° 15.242′N, 61° 11.901′W; 20 AUG 2005, M.A. Ivie; coastal scrub (1 WIBF, disarticulated) . GUADELOUPE:; Petite Terre Islands ; Is. Terre de Bas; 16° 10′N, 61° 07′W; 25 AUG 2003, J. Touroult (3 WIBF) . Acc. 4860; Gourbeyre ; Guadeloupe (3 AMNH) . GUADELOUPE; Marie Galante Isl. ; around Grand-Bourgh; 15° 56′N, 61° 16′W; 30.IX.2007; leg. Tomáš Pavliček (5 MLPC) . Terre de Haut ; Les Saintes / 28-VII-1945; HStehle/ 1023 (1 NMNH) . Guade. ; loupe/ C.O. Lovin (4 NHMB) . Guadeloupe; coll. R. Oberthür; ex coll. Deyrolle / puncticeps M&R ∼; det. Kaszab (2 HNHM) . Guadeloupe; Anse-à-l’ Eau ; 11.II.78; F. Chalumeau (9 OSUC) . Guadeloupe; 16.3.78; F. Chalumeau (4 HNHM) . Guadeloupe; Ilet Pigeon / 21.6.78; F. Chalumeau (6 HNHM) . Guadeloupe; Ilet Pigeon / 29.1.78; F. Chalumeau (7 HNHM) . Guadeloupe; Ilet Pigeon ; 2-V-78; F. Chalumeau (6 OSUC) . Guadeloupe; Ilet Pigeon ; 29-I-78; F. Chalumeau (4 OSUC) . Guadeloupe; Petite-Terre ; 26-III-78; F. Chalumeau (12 OSUC) . Marie-Galante ; Pointe- Pisiou; 4-II-78; F. Chalumeau (8 OSUC) . Guadeloupe; Anse Lagourde ; 20-I-73; F. Chalumeau (1 OSUC) . LESSER ANTILLES; Dominica; The Cabrits ; 24 MAR 1966; D. E. Johnston / ex stonework (4 WIBF) . WEST INDIES: Dominica; Batalie Beach : 1m; 15.4535°N, 61.4467°W; 30MAY2011, sand washing (1 WIBF) .

Figures

Figs. 8–15. Diastolinus chalumeaui, holotype: 8) Dorsal habitus; 9) Abdominal ventrites; 10) Aedeagus, dorsal view; 11) Aedeagus, lateral view. Diastolinus clavatus: 12) Dorsal habitus; 13) Abdominal ventrites; 14) Aedeagus, dorsal view; 15) Aedeagus, lateral view.

Fig. 106. Map of the distributions of Diastolinus species in the Lesser Antilles.