Stenus (Nestus) sphaerops Casey 1884

Stenus ( Nestus ) sphaerops Casey, 1884 (Figs. 6B, 7 I–J) Stenus sphaerops Casey, 1884: 68. Stenus (s. str.) sphaerops – Campbell & Davies 1991: 112. Material examined USA: 1 ♂, ‘ U.S.A.: New York. S. Westerlo: Bear Swamp. 12VIII:1974. Leg: W. Suter. Albany Co.’, ‘FM(HD)#74-195. Berlese...

Full description

Bibliographic Details
Main Author: Ryvkin, Alexandr B.
Format: Text
Language:unknown
Published: Zenodo 2012
Subjects:
Online Access:https://dx.doi.org/10.5281/zenodo.3858635
https://zenodo.org/record/3858635
id ftdatacite:10.5281/zenodo.3858635
record_format openpolar
institution Open Polar
collection DataCite Metadata Store (German National Library of Science and Technology)
op_collection_id ftdatacite
language unknown
topic Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Stenus
Stenus sphaerops
spellingShingle Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Stenus
Stenus sphaerops
Ryvkin, Alexandr B.
Stenus (Nestus) sphaerops Casey 1884
topic_facet Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Stenus
Stenus sphaerops
description Stenus ( Nestus ) sphaerops Casey, 1884 (Figs. 6B, 7 I–J) Stenus sphaerops Casey, 1884: 68. Stenus (s. str.) sphaerops – Campbell & Davies 1991: 112. Material examined USA: 1 ♂, ‘ U.S.A.: New York. S. Westerlo: Bear Swamp. 12VIII:1974. Leg: W. Suter. Albany Co.’, ‘FM(HD)#74-195. Berlese: Sphagnum . WS#74–61D.’ (FMNH). Differential diagnosis Based on many external characters, this species might be placed separately within the canaliculatus group. Nevertheless, from the shape and structure of the aedeagus, one can suppose it to be most closely related to the latipennis-illusor-delitor complex. S . sphaerops differs from all the known species of this complex by the broader head with eyes much more convex, by the greater and more bulging pronotum, by the shorter elytra, by the much coarser forebody puncturation, by the less developed ground sculpture, and by the shape of aedeagus. Redescription LENGTH. 4.0– 4.1 mm. COLORATION. The single specimen on hand is somewhat immature; therefore, the genuine coloration is probably darker than described here. Body pitchy black, moderately shining, with fairly short silvery pubescence. Legs dark brown with middle parts of femora somewhat lighter, reddish; antennae reddishbrown with 1 st segment pitchy black and 2 nd segment dark brown; palpi brown, with segment 1 and base of segment 2 yellow. HEAD. Evidently broader than elytra between humeri (69:62), nearly as broad as elytra in posterior quarter (69:70). Front with a pair of fairly broad and deep longitudinal impressions and a broad keelshaped median elevation that is not very prominent but well developed; median elevation 1.8 times as broad as each of lateral pieces. Puncturation coarse and dense, irregular, partly rugose along internal margins of eyes, with small smooth spot in middle of median longitudinal ridge; diameter of coarsest punctures evidently larger than basal cross of antennal segment 3. Frontal slope before antennal fossae fairly gentle. Antennae long, reaching basal 1/4 of pronotum. Length proportions of antennal segments 2–11 = 8:11.5:10:8:7:7:5:6:6:7.5; segments of club distinctly elongate (6:3.5, 6:4.5, 7.5:4). PRONOTUM. Distinctively large, bulging, uneven, a bit longer than broad (55:52), broadest near middle of length, narrowed convexly anteriorly and concavely posteriorly. Median longitudinal groove deep over almost entire length of disk, vanishing just behind slightly elevated anterior margin. Laterobasal depressions shallow though laterobasal prominences developed. Puncturation coarse, in part nonrugosely obliquely confluent, distinctly greater in middle of length; punctures much larger than those of head. ELYTRA. Somewhat broader than long (70:63), nearly as broad between humeri as long (62:63), about 1/7 longer than pronotum (63:55) although a bit shorter than pronotum (53:55) by suture. Humeral angles short but prominent, lateral sides slightly convexly and moderately divergent posteriorly (62:70). Humeral and sutural depressions rather feeble, vanished posteriorly. Puncturation deep, distinctively larger in diameter than that of pronotum, more regular, partly nonrugosely confluent but not forming long furrows. LEGS. Rather long; segment 1 of metatarsi obviously longer than segment 5 (15:12) though shorter than segments 2–4 together. ABDOMEN. Moderately convex, with well developed paratergites and two pairs of keels at bases of anterior visible tergites. Lateral sides uniformly convergent posteriorly. Tergite 7 with very fine light fringe at posterior margin. Puncturation of tergites fairly dense, on anterior visible tergites distinctly sparser medioposteriorly; average diameter of punctures on anterior visible tergites about equal to that of median elevation of head. MICROSCULPTURE. Very fine but regular mesh-like ground sculpture evident between punctures on abdominal tergites 6–10; other surfaces smooth or with infrequent, extremely vague netting mainly by margins of punctures. MALE. Meso- and metatibiae without specific characters; abdominal sternites 6–7 slightly depressed along midline and slightly emarginated medioposteriorly; abdominal sternite 8 with broad but not deep, rounded emargination of posterior margin and with flat depression in posterior half; lateral pieces uniformly rounded; abdominal sternite 9 as in Fig. 7J; aedeagus as in Figs. 6B, 7I. Remarks Originally described for the male holotype only: ‘Massachusetts’. Campbell & Davies (1991), without citing material, recorded it for the Canadian provinces Ontario, Quebec, and Nova Scotia, as well as the Northwest Territories. The original description, though fairly long and detailed, did not contain some necessary data comparable to those of present-day publications. Inasmuch as neither descriptions nor figures have been provided for S . sphaerops since Casey (1884), I thought it useful to give such a description here. : Published as part of Ryvkin, Alexandr B., 2012, New species and records of Stenus (Nestus) of the canaliculatus group, with the erection of a new species group (Insecta: Coleoptera: Staphylinidae: Steninae), pp. 1-62 in European Journal of Taxonomy 13 on pages 40-41, DOI: 10.5852/ejt.2012.13, http://zenodo.org/record/3857775 : {"references": ["Casey Th. L. 1884. Revision of the Stenini of America north of Mexico. Insects of the family Staphylinidae, order Coleoptera. Collins Printing House, Philadelphia. 206 pp. http: // dx. doi. org / 10.5962 / bhl. title. 9208", "Campbell J. M. & Davies A. 1991. Family Staphylinidae. Rove beetles. In: Checklist of beetles of Canada and Alaska. Publication 1861 / E: 86 - 124. Agriculture Canada, Ottawa."]}
format Text
author Ryvkin, Alexandr B.
author_facet Ryvkin, Alexandr B.
author_sort Ryvkin, Alexandr B.
title Stenus (Nestus) sphaerops Casey 1884
title_short Stenus (Nestus) sphaerops Casey 1884
title_full Stenus (Nestus) sphaerops Casey 1884
title_fullStr Stenus (Nestus) sphaerops Casey 1884
title_full_unstemmed Stenus (Nestus) sphaerops Casey 1884
title_sort stenus (nestus) sphaerops casey 1884
publisher Zenodo
publishDate 2012
url https://dx.doi.org/10.5281/zenodo.3858635
https://zenodo.org/record/3858635
geographic Canada
Northwest Territories
geographic_facet Canada
Northwest Territories
genre Northwest Territories
Alaska
genre_facet Northwest Territories
Alaska
op_relation http://zenodo.org/record/3857775
http://publication.plazi.org/id/7C06FF85C02CFFCDFFA1AD48FFD59832
http://zoobank.org/FD8B1D59-D1F8-41D1-9BAB-A6FF12AD574F
https://zenodo.org/communities/biosyslit
https://dx.doi.org/10.5852/ejt.2012.13
http://zenodo.org/record/3857775
http://publication.plazi.org/id/7C06FF85C02CFFCDFFA1AD48FFD59832
https://dx.doi.org/10.5281/zenodo.3857787
https://dx.doi.org/10.5281/zenodo.3857789
http://zoobank.org/FD8B1D59-D1F8-41D1-9BAB-A6FF12AD574F
https://dx.doi.org/10.5281/zenodo.3858636
https://zenodo.org/communities/biosyslit
op_rights Open Access
Creative Commons Zero v1.0 Universal
https://creativecommons.org/publicdomain/zero/1.0/legalcode
cc0-1.0
info:eu-repo/semantics/openAccess
op_rightsnorm CC0
op_doi https://doi.org/10.5281/zenodo.3858635
https://doi.org/10.5852/ejt.2012.13
https://doi.org/10.5281/zenodo.3857787
https://doi.org/10.5281/zenodo.3857789
https://doi.org/10.5281/zenodo.3858636
_version_ 1766150710852845568
spelling ftdatacite:10.5281/zenodo.3858635 2023-05-15T17:46:50+02:00 Stenus (Nestus) sphaerops Casey 1884 Ryvkin, Alexandr B. 2012 https://dx.doi.org/10.5281/zenodo.3858635 https://zenodo.org/record/3858635 unknown Zenodo http://zenodo.org/record/3857775 http://publication.plazi.org/id/7C06FF85C02CFFCDFFA1AD48FFD59832 http://zoobank.org/FD8B1D59-D1F8-41D1-9BAB-A6FF12AD574F https://zenodo.org/communities/biosyslit https://dx.doi.org/10.5852/ejt.2012.13 http://zenodo.org/record/3857775 http://publication.plazi.org/id/7C06FF85C02CFFCDFFA1AD48FFD59832 https://dx.doi.org/10.5281/zenodo.3857787 https://dx.doi.org/10.5281/zenodo.3857789 http://zoobank.org/FD8B1D59-D1F8-41D1-9BAB-A6FF12AD574F https://dx.doi.org/10.5281/zenodo.3858636 https://zenodo.org/communities/biosyslit Open Access Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode cc0-1.0 info:eu-repo/semantics/openAccess CC0 Biodiversity Taxonomy Animalia Arthropoda Insecta Coleoptera Staphylinidae Stenus Stenus sphaerops article-journal ScholarlyArticle Text Taxonomic treatment 2012 ftdatacite https://doi.org/10.5281/zenodo.3858635 https://doi.org/10.5852/ejt.2012.13 https://doi.org/10.5281/zenodo.3857787 https://doi.org/10.5281/zenodo.3857789 https://doi.org/10.5281/zenodo.3858636 2022-03-10T13:33:19Z Stenus ( Nestus ) sphaerops Casey, 1884 (Figs. 6B, 7 I–J) Stenus sphaerops Casey, 1884: 68. Stenus (s. str.) sphaerops – Campbell & Davies 1991: 112. Material examined USA: 1 ♂, ‘ U.S.A.: New York. S. Westerlo: Bear Swamp. 12VIII:1974. Leg: W. Suter. Albany Co.’, ‘FM(HD)#74-195. Berlese: Sphagnum . WS#74–61D.’ (FMNH). Differential diagnosis Based on many external characters, this species might be placed separately within the canaliculatus group. Nevertheless, from the shape and structure of the aedeagus, one can suppose it to be most closely related to the latipennis-illusor-delitor complex. S . sphaerops differs from all the known species of this complex by the broader head with eyes much more convex, by the greater and more bulging pronotum, by the shorter elytra, by the much coarser forebody puncturation, by the less developed ground sculpture, and by the shape of aedeagus. Redescription LENGTH. 4.0– 4.1 mm. COLORATION. The single specimen on hand is somewhat immature; therefore, the genuine coloration is probably darker than described here. Body pitchy black, moderately shining, with fairly short silvery pubescence. Legs dark brown with middle parts of femora somewhat lighter, reddish; antennae reddishbrown with 1 st segment pitchy black and 2 nd segment dark brown; palpi brown, with segment 1 and base of segment 2 yellow. HEAD. Evidently broader than elytra between humeri (69:62), nearly as broad as elytra in posterior quarter (69:70). Front with a pair of fairly broad and deep longitudinal impressions and a broad keelshaped median elevation that is not very prominent but well developed; median elevation 1.8 times as broad as each of lateral pieces. Puncturation coarse and dense, irregular, partly rugose along internal margins of eyes, with small smooth spot in middle of median longitudinal ridge; diameter of coarsest punctures evidently larger than basal cross of antennal segment 3. Frontal slope before antennal fossae fairly gentle. Antennae long, reaching basal 1/4 of pronotum. Length proportions of antennal segments 2–11 = 8:11.5:10:8:7:7:5:6:6:7.5; segments of club distinctly elongate (6:3.5, 6:4.5, 7.5:4). PRONOTUM. Distinctively large, bulging, uneven, a bit longer than broad (55:52), broadest near middle of length, narrowed convexly anteriorly and concavely posteriorly. Median longitudinal groove deep over almost entire length of disk, vanishing just behind slightly elevated anterior margin. Laterobasal depressions shallow though laterobasal prominences developed. Puncturation coarse, in part nonrugosely obliquely confluent, distinctly greater in middle of length; punctures much larger than those of head. ELYTRA. Somewhat broader than long (70:63), nearly as broad between humeri as long (62:63), about 1/7 longer than pronotum (63:55) although a bit shorter than pronotum (53:55) by suture. Humeral angles short but prominent, lateral sides slightly convexly and moderately divergent posteriorly (62:70). Humeral and sutural depressions rather feeble, vanished posteriorly. Puncturation deep, distinctively larger in diameter than that of pronotum, more regular, partly nonrugosely confluent but not forming long furrows. LEGS. Rather long; segment 1 of metatarsi obviously longer than segment 5 (15:12) though shorter than segments 2–4 together. ABDOMEN. Moderately convex, with well developed paratergites and two pairs of keels at bases of anterior visible tergites. Lateral sides uniformly convergent posteriorly. Tergite 7 with very fine light fringe at posterior margin. Puncturation of tergites fairly dense, on anterior visible tergites distinctly sparser medioposteriorly; average diameter of punctures on anterior visible tergites about equal to that of median elevation of head. MICROSCULPTURE. Very fine but regular mesh-like ground sculpture evident between punctures on abdominal tergites 6–10; other surfaces smooth or with infrequent, extremely vague netting mainly by margins of punctures. MALE. Meso- and metatibiae without specific characters; abdominal sternites 6–7 slightly depressed along midline and slightly emarginated medioposteriorly; abdominal sternite 8 with broad but not deep, rounded emargination of posterior margin and with flat depression in posterior half; lateral pieces uniformly rounded; abdominal sternite 9 as in Fig. 7J; aedeagus as in Figs. 6B, 7I. Remarks Originally described for the male holotype only: ‘Massachusetts’. Campbell & Davies (1991), without citing material, recorded it for the Canadian provinces Ontario, Quebec, and Nova Scotia, as well as the Northwest Territories. The original description, though fairly long and detailed, did not contain some necessary data comparable to those of present-day publications. Inasmuch as neither descriptions nor figures have been provided for S . sphaerops since Casey (1884), I thought it useful to give such a description here. : Published as part of Ryvkin, Alexandr B., 2012, New species and records of Stenus (Nestus) of the canaliculatus group, with the erection of a new species group (Insecta: Coleoptera: Staphylinidae: Steninae), pp. 1-62 in European Journal of Taxonomy 13 on pages 40-41, DOI: 10.5852/ejt.2012.13, http://zenodo.org/record/3857775 : {"references": ["Casey Th. L. 1884. Revision of the Stenini of America north of Mexico. Insects of the family Staphylinidae, order Coleoptera. Collins Printing House, Philadelphia. 206 pp. http: // dx. doi. org / 10.5962 / bhl. title. 9208", "Campbell J. M. & Davies A. 1991. Family Staphylinidae. Rove beetles. In: Checklist of beetles of Canada and Alaska. Publication 1861 / E: 86 - 124. Agriculture Canada, Ottawa."]} Text Northwest Territories Alaska DataCite Metadata Store (German National Library of Science and Technology) Canada Northwest Territories