Ardistomis schaumii LeConte, 1857

Bousquet, Yves, 2006, Review of the species of Ardistomina (Coleoptera: Carabidae: Clivinini) in America north of Mexico, Zootaxa 1308, pp. 1-29 : 18-19

Ardistomis schaumii LeConte, 1857

( Figs 7 , 10 , 13, 18 , 21, 22 , 27, 30 , 34 )

Ardistomis schaumii LeConte 1857: 80 . Type locality: "Louisiana", U.S.A., herein restricted to Alexandria, Rapides Parish. ­ Putzeys (1866: 201); LeConte (1879: 32); Ciegler (2000: 43). Ardistomis schaumi: Nichols (1988a: 72, 101).

Type Material. LeConte (1857) described A. schaumii from an unspecified number of specimens. His collection, housed in MCZ, contains five specimens under this name. The first one is labelled "[orange disc] / A. schaumii Lec. [handwritten] / Type 5486 / Lectotype Ardistomis schaumi LeC. Des. S.W. Nichols 1986", the second one "Cedar Keys June 7 Fla / schaumii 2 [handwritten] / Ardistomis schaumi LeConte S.W. Nichols det. 1982", the third one " schaumii 3 [handwritten] / Ardistomis schaumi LeConte S.W. Nichols det. 1982", the fourth one "Capron 23.4 Fla / schaumii 4 [handwritten] / Ardistomis schaumi LeConte S.W. Nichols det. 1982", and the last one "Capron 30.3 Fla / schaumii 5 [handwritten]". The lectotype designation is hereby published.

Diagnosis. Distinguished most readily from members of A. obliquatus by the presence of bluish­green lustre and absence of preapical spots on the elytra.

Description. Color: Head dorsally more or less reddish­brown, pronotum mostly black with faint blue­green lustre, elytra black with blue­green lustre, without preapical spots; antennae reddish­brown; palpi paler, yellowish; legs reddish­brown. Microsculpture: Pronotum with isodiametric to scalelike meshes more impressed laterally than on disc. Elytra with faint scalelike meshes. Head: Vertex between posterior supraorbital setae with shallow transverse groove. Last labial palpomere subequal to penultimate palpomere. Prothorax: Anterior transverse depression well­impressed medially. Elytra: Striae well­impressed from base to apex. Interval 3 with five (­ six) setae. Abdomen: Last visible sternum without accessory setae near base. Male Genitalia: Median lobe relatively short, robust, with apex tapered ( Fig. 7 a), parameres markedly dissimilar ( Fig. 7 b), endophallus with large spines ( Fig. 10 ). Female Genitalia: Apical stylomere relatively narrow ( Fig. 13 ); seminal tube of spermatheca ( Fig. 18 ) as illustrated.

Body length: 5.0–6.0 mm.

Geographical Distribution. Specimens of this species have been collected on the Coastal Plain north to Georgia, and from southern Illinois south to Honduras ( Nichols 1988a: 102) ( Fig. 34 ).

Habitat. Nichols (1988a: 103) recorded this species as "swamp­inhabiting."

Comments. This species appears to be closely related, if not identical, to Ardistomis elongatulus Putzeys from Cuba.

Figures

FIGURE 34. Collection localities for Ardistomis schaumii LeConte in United States of America.

FIGURES 4 – 8. Median lobe (a) and paremeres (b). 4, Aspidoglossa subangulata; 5, Semiardistomis viridis; 6, S. puncticollis; 7, Ardistomis schaumii; 8, A. obliquatus.

FIGURES 9 – 10. Sclerotized structures of endophallus. 9, Ardistomis obliquatus; 10, A. schaumii.

FIGURES 11 – 18. 11 – 14. Apical stylomere. 11, Aspidoglossa subangulata; 12, Semiardistomis viridis; 13, Ardistomis schaumii; 14, A. obliquatus. 15 – 18. Spermatheca. 15, Aspidoglossa subangulata; 16, Semiardistomis viridis; 17, S. puncticollis; 18, Ardistomis schaumii.

FIGURES 19 – 22. 19 – 21. Head (dorsal view). 19, Aspidoglossa subangulata; 20, Semiardistomis viridis; 21, Ardistomis schaumii. 22, Extremity of body (lateral view) of Ardistomis schaumii. Scale bar = 0.2 mm (Figs 20 – 22), 0.5 mm (Fig. 19).

FIGURES 27 – 30. 27, Prosternum of Ardistomis schaumii. 28 – 30. Protibia (ventral view). 28, Aspidoglossa subangulata; 29, Semiardistomis viridis; 30, Ardistomis schaumii. Scale bar = 0.2 mm.