Diastolinus doyeni 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 doyeni Hart and Ivie , new species

( Figs. 46–50 , 104 )

Type Material. HOLOTYPE: Male. Coamo Sprs. ; VIII.25.1919; ac: 5528./ WIBF 035400 ( AMNH) . PARATYPES (5 specimens): PR: Dorado, Rd. 697; end, Coastal Strand ; XII-21-1986 J. Doyen; & J.A. Santiago-Blay; scrub&forest assoc.(2 females, WIBF 035401 - 035402 ). PR:nr.1 Laguna; Tortuguero, NW Vega; Baja. XII-25-1986; Doyen & Santiago (1 female, WIBF 035403 , EMEC). PR: Bosque at Playa ; de Dorado, Dorado; XII-25-1986 Doyen; & Santiago (1 male and 1 female, WIBF 035404 - 035405 ) .

Etymology. This species is named for John Doyen, a collector of the paratypes as well as a prolific and outstanding worker on Tenebrionidae .

Diagnosis. This species can be distinguished from most other Puerto Rican species by the combination of the small, narrow body, nearly glabrous abdominal ventrites, short gular horn, presence of very few short setae on the upper surface, and width across the humeri equal to the base of the pronotum. This species resembles D. tibidens , but males do not have armed front tibiae.

Description. Male. Length 7.8–8.6 mm, width 3.2–3.7 mm. Body ( Fig. 46 ) black, except last 3 antennomeres testaceous, labrum reddish; upper surface somewhat shiny; narrow, elongate; widest on pronotum; moderately convex; scattered, yellow setae typically short.

Head ( Fig. 47 ) transverse, somewhat flattened; punctures subequal in diameter to ommatidium, covering dorsal surface, evenly spaced, separated by more than 1X puncture diameter posteriorly, spaced more closely anteriorly. Labrum densely, shallowly punctate, punctures equal in size to punctures on head, closely spaced. Antenna weakly clavate. Dorsal portion of eye perfectly rounded; ventral portion of eye ovate. Gular horns short.

Pronotum ( Fig. 47 ) widest at middle; apical margin broadly emarginate; apical corners rounded, lateral margin widened from apex in anterior 1/2, then sides rounded to base; basal width equal 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 subequal to punctures on head, spaced 2–5X diameters of punctures on pronotal disc; setae typically absent on disc, minute setae visible laterally, 1–2X puncture diameters in length. Hypomeron feebly rugulose. Prosternal process tongue-like, shallowly punctate, with few setae.

Scutellum ( Fig. 47 ) triangular, about 2X wider than long. Elytra constricted in anterior 1/3. Elytron gradually broadening from base to widest point opposite the posterior border of abdominal ventrite 1, then gently arcuate to apices; striae impressed; medial striae less costate than lateral striae; strial punctures deep, sometimes confluent posteriorly; intervals broadly convex, punctation minute. Stria 7 ending in lateral stria posterior to humeral angle.

Mesoventrite somewhat rugulose. Metaventrite very short, punctate on anterior border behind mesocoxae.

Leg surfaces setose and finely punctate. Femora expanded. Protibia narrow basally, then gradually widened; posteroventral surface with stout spines in apical 1/3; apex obliquely truncate, ringed by stout spines. Protarsus with tarsomeres 1–3 expanded, ventrally with golden, densely setose pads, tarsomere 2 widest, more than 2X width of tarsomere 4. Mesotarsus somewhat expanded, ventrally with golden, densely setose pads. Metatarsus narrow, subequal in length to metatibia, without setose pads; 1 st tarsomere 2X length of 2 nd.

Abdominal ventrites ( Fig. 48 ) 1–3 almost glabrous laterally, except punctation on anterior border of ventrites 1–3; ventrites 1–3 slightly concave medially, concavity not extending onto intercoxal process; anterior border of ventrites 1–3, just behind hind coxae, with row of heavy punctures; ventrite 5 flattened medially, posterior margin evenly rounded. Aedeagus ( Figs. 49, 50 ) with basal piece and parameres strongly arched, about equal to 1/2 elytral length; parameres narrowing evenly apically, then expanding to widest point, then converging towards apex, broadly rounded just before apex; parameres with slightly sinuate lateral margin, with upturned tips in lateral view.

Female. Length 7.8–8.3 mm, width 3.3– 3.7 mm. Similar to male except pro- and mesotarsi not expanded. Abdominal ventrites 1–3 slightly convex medially; ventrite 5 slightly convex.

Biology. Some specimens were associated with scrub forest.

Distribution. Puerto Rico * (AMNH, WIBF) ( Fig. 104 ).

Figures

Figs. 46–50. Diastolinus doyeni, holotype. 46) Dorsal habitus; 47) Pronotum; 48) Abdominal ventrites; 49) Aedeagus, dorsal view; 50) Aedeagus, lateral view.

Fig. 104. Map of the distributions of the “sellio” species-group of Diastolinus species on Puerto Rico and Virgin Islands. Symbols on Puerto Rico represent collecting localities, and symbols on the Virgin Islands represent island distributions, not all collection events.