A new species of Stethelmis Hinton (Coleoptera: Elmidae) from Argentina and description of its larva

Abstract: A new species of Stethelmis, S. shepardi sp. nov., is described for Patagonia, Argentina from adults of both sexes. A full description and illustrations of both the adult and the larva of the new species are provided with comments on its habitat and distribution. Adults of the new species are compared with those of S. kaszabi (HintonHINTON HE. 1945. Stethelmis chilensis, new genus and species of Elmidae from Chile (Coleoptera). P Roy Entomol Soc B 14: 73-76. 1970) and S. chilensis (Hinton 1945). The larva of S. shepardi is compared with that of S. kaszabi, the other Stethelmis larva described. We also describe and illustrate for the first time the male genitalia of S. kaszabi. A key to the known species of Stethelmis is also included.

Key words
Elminae; Neotropical; Patagonia; Riffle beetles; Stethelmis shepardi

Authorship

NICOLÁS RAFAEL MARTÍNEZ-ROMÁN

Laboratorio de Investigaciones en Ecología y Sistemática Animal (LIESA), CIEMEP (CONICET–UNPSJB) Roca 780, C.P. 9200 Esquel, Chubut, Argentina CIEMEP (CONICET–UNPSJB)ArgentinaEsquel, Chubut, ArgentinaLaboratorio de Investigaciones en Ecología y Sistemática Animal (LIESA), CIEMEP (CONICET–UNPSJB) Roca 780, C.P. 9200 Esquel, Chubut, Argentina

https://orcid.org/0000-0001-6630-1832

VERÓNICA MANZO

Instituto de Biodiversidad Neotropical (IBN), UNT–CONICET, Crisóstomo Álvarez 722, San Miguel de Tucumán C.P. 4000, Tucumán, Argentina Instituto de Biodiversidad Neotropical (IBN), UNT–CONICETArgentinaTucumán, ArgentinaInstituto de Biodiversidad Neotropical (IBN), UNT–CONICET, Crisóstomo Álvarez 722, San Miguel de Tucumán C.P. 4000, Tucumán, Argentina

MIGUEL ARCHANGELSKY

Correspondence to: Nicolás Rafael Martínez-Román E-mail: martinezroman@comahue-conicet.gob.ar ORCid: https://orcid.org/0000-0001-6630-1832

AUTHOR CONTRIBUTIONS

NRMR and MA performed the fieldwork; NRMR and VM performed most of the morphological studies on adult specimens; MA and NRMR performed most of the larval studies; NRMR and MA were in charge of the photographic documentation; all authors took part on the preparation of the manuscript.

SCIMAGO INSTITUTIONS RANKINGS

Figures

Figures (8)

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Figures 1–5
Stethelmis shepardi sp. nov. adult. (1) dorsal habitus; (2) ventral habitus; (3) detail of pronotum; (4) detail of leg; (5) detail of leg tarsal claw. Scale bars: Figs. 1–2: 1 mm; Fig. 3: 0.50 mm; Fig. 4: 0.25 mm; Fig. 5: 0.1 mm.

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Figures 6–7
Stethemis shepardi mature larva, habitus. (8) dorsal view; (9) lateral view; (10) ventral view. Scale bar: Figs. 8–10: 1 mm.

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Figures 8–10
Male genitalia of Stethelmis spp. (6) aedeagus of Stethelmis shepardi; (7) aedeagus of Stethelmis kaszabi. Scale bars: Figs. 6–7: 0.25 mm.

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Figures 11–17
Stethemis shepardi mature larva. (11) head capsule, dorsal view; (12) maxillo–labial complex and gula, ventral view; (13) detail of maxillo–labial complex showing distal end of right maxilla and labium; (14) labrum, dorsal view; (15) left mandible, dorsolateral view; (16); labrum, ventral view; (17) antennae, dorsal view. Scale bars: Figs. 11–12, 15: 0.10 mm; Figs. 13–14, 16–17: 0.05 mm. Abbreviation: Gu- gula.

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Figures 18–27
Stethelmis shepardi mature larva. (18) prothorax, ventral view; (19) prothorax, dorsal view; (20) mesothorax, ventral view; (21) mesothorax, dorsal view; (22) abdomen, dorsal view ; (23) abdomen, lateral view; (24) detail of basal portion of the fourth abdominal segment, dorsal view; (25) detail of distal margin of the fourth abdominal segment, ventral view; (26) detail of fifth abdominal segment, dorsal view; (27) detail of fifth abdominal segment, lateral view. Scale bars: Figs. 18–21, 26–27: Figs. 24–25: 0.10 mm.

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Figures 28–31
Stethelmis shepardi mature larva. (28) prothoracic leg; (29) operculum of ninth abdominal segment, ventral view; (30) ninth abdominal segment, dorsal view; (31) anal hook of opercular chamber. Scale bars: Figs. 28, 30: 0.25 mm; Figs. 29, 31: 0.10 mm.

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Figure 32
Distribution map of Stethelmis shepardi sp. nov.

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Figures 33–37
Creek habitats of Stethelmis shepardi sp. nov. (33) and (34) Comisario creek; (35) and (37) boulder covered by bryophytes in Comisario and La Hoya creeks, respectively; (36) La Hoya creek. Photographs by Nicolás Martínez Román.

Figures 1–5 Stethelmis shepardi sp. nov. adult. (1) dorsal habitus; (2) ventral habitus; (3) detail of pronotum; (4) detail of leg; (5) detail of leg tarsal claw. Scale bars: Figs. 1–2: 1 mm; Fig. 3: 0.50 mm; Fig. 4: 0.25 mm; Fig. 5: 0.1 mm.

Figures 6–7 Stethemis shepardi mature larva, habitus. (8) dorsal view; (9) lateral view; (10) ventral view. Scale bar: Figs. 8–10: 1 mm.

Figures 8–10 Male genitalia of Stethelmis spp. (6) aedeagus of Stethelmis shepardi; (7) aedeagus of Stethelmis kaszabi. Scale bars: Figs. 6–7: 0.25 mm.

Figures 11–17 Stethemis shepardi mature larva. (11) head capsule, dorsal view; (12) maxillo–labial complex and gula, ventral view; (13) detail of maxillo–labial complex showing distal end of right maxilla and labium; (14) labrum, dorsal view; (15) left mandible, dorsolateral view; (16); labrum, ventral view; (17) antennae, dorsal view. Scale bars: Figs. 11–12, 15: 0.10 mm; Figs. 13–14, 16–17: 0.05 mm. Abbreviation: Gu- gula.

Figures 18–27 Stethelmis shepardi mature larva. (18) prothorax, ventral view; (19) prothorax, dorsal view; (20) mesothorax, ventral view; (21) mesothorax, dorsal view; (22) abdomen, dorsal view ; (23) abdomen, lateral view; (24) detail of basal portion of the fourth abdominal segment, dorsal view; (25) detail of distal margin of the fourth abdominal segment, ventral view; (26) detail of fifth abdominal segment, dorsal view; (27) detail of fifth abdominal segment, lateral view. Scale bars: Figs. 18–21, 26–27: Figs. 24–25: 0.10 mm.

Figures 28–31 Stethelmis shepardi mature larva. (28) prothoracic leg; (29) operculum of ninth abdominal segment, ventral view; (30) ninth abdominal segment, dorsal view; (31) anal hook of opercular chamber. Scale bars: Figs. 28, 30: 0.25 mm; Figs. 29, 31: 0.10 mm.

Figure 32 Distribution map of Stethelmis shepardi sp. nov.

Figures 33–37 Creek habitats of Stethelmis shepardi sp. nov. (33) and (34) Comisario creek; (35) and (37) boulder covered by bryophytes in Comisario and La Hoya creeks, respectively; (36) La Hoya creek. Photographs by Nicolás Martínez Román.

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A new species of Stethelmis Hinton (Coleoptera: Elmidae) from Argentina and description of its larva

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[1] Correspondence to: Nicolás Rafael Martínez-Román E-mail: martinezroman@comahue-conicet.gob.ar ORCid: https://orcid.org/0000-0001-6630-1832