Thescelosynchroa, Hsiao & Ondřej Konvička & Chiun-Cheng Ko, 2018

Hsiao, Yun, Ondřej Konvička & Chiun-Cheng Ko, 2018, The world fauna of Synchroidae Lacordaire, 1859 (Coleoptera, Tenebrionoidea, Synchroidae), European Journal of Taxonomy 407, pp. 1-33 : 10-13

publication ID

https://doi.org/ 10.5852/ejt.2018.407

publication LSID

lsid:zoobank.org:pub:23400D07-8995-4BCC-ADB2-92DDBC4A0161

DOI

https://doi.org/10.5281/zenodo.5697780

persistent identifier

https://treatment.plazi.org/id/03C087BC-7D14-FF93-FD97-FC9949E50C94

treatment provided by

Plazi

scientific name

Thescelosynchroa
status

 

Synchroa punctata Newman, 1838

Figs 3A–B View Fig. 3 , 4A, G View Fig. 4 , 5A–B, M View Fig. 5 , 6A–E View Fig. 6

Synchroa punctata Newman, 1838: 378 .

Diagnosis

This species can be easily distinguished from other species of Synchroa by the following combination of characters: body densely covered by pale simple setae; pronotum smooth and impunctate in medio-longitudinal part of posterior half, lateral sides almost entirely margined; prosternal process with long oval apex; aedeagus: parameres moderately narrowed apically, abruptly strongly narrowed at apex.

Material examined

UNITED STATES OF AMERICA: 3 larvae, Hemlock Draw , Sauk Co., Wisconsin, 43°21′50″ N, 89°56′49″ W, 30 Mar. 2001, D.S. Biggs leg. (YHC) GoogleMaps ; 1 ♀, Hemlock Draw , Sauk Co., Wisconsin, 43°21′46″ N, 89°56′34″ W, 11–20 Jun. 2001, Lindgren Funnel Trap, D. Young leg. (YHC) GoogleMaps ; 1 ♂, 1 ♀, same locality data as previous, 6–11 Jul. 2001, Lindgren Funnel Trap, D. Young leg. ( YHC) GoogleMaps ; 1 ♂, 2 ♀♀, same locality data as previous, 19–25 Jul. 2001, Lindgren Funnel Trap, D. Young leg. ( YHC); GoogleMaps 1 larva, Merrill , Marathon Co., Wisconsin, 22 Feb. 2003, E. Nowak leg. ( YHC); GoogleMaps 1 larva, Hemlock Draw, Sauk Co., Wisconsin, 43°21′46″ N, 89°56′57″ W, 21 Apr. 2003, A. Bendlin leg. ( YHC); GoogleMaps 5 larvae, Otter Creek, Rock Co., Wisconsin, 27 Apr. 2003, A. Bendlin leg. ( YHC); 1 ex., West Jefferson , 20 km W of Columbus, Ohio, 6 Jun. 2008, Košťál leg. ( OKCZ).

CANADA: 1 ex., Warwick Conservation Area , Ontario, 42.995 N, 81.948 W, Jul. 2014, collector unknown ( OKCZ) GoogleMaps ; 1 ex., Ottawa, Stittsville , Ontario, 45.275 N, 75.972 W, 3 Jul. 2014, collector unknown ( OKCZ) GoogleMaps ; 1 ex., Cornwall , Ontario, 45.04384 N, 74.71467 W, 14 Jul. 2014, collector unknown ( OKCZ) GoogleMaps ; 2 ex., Cornwall , Ontario, 45.04384 N, 74.71467 W, 14 Jul. 2014, collector unknown ( OKCZ) GoogleMaps ; 2 ex., Merritt island , Ontario, 43.00255 N, 79.241 W, 16 Jul. 2014, collector unknown ( OKZC) GoogleMaps ; 1 ♂, Boucherville , Québec, 45.55 N, 73.42 W, 21 Aug. 2014, collector unknown (YHC) GoogleMaps ; 1 ♂, Québec, 46.79416 N, 71.32895 W, 14 Jul. 2015, collector unknown (YHC); 2 ex., Brantford, Ontario , 43.15806 N, 80.35835 W, 27 Jul. 2015, collector unknown ( OKCZ) GoogleMaps .

Redescription

COLOUR. Body and legs completely blackish-brown. Antennae brown in some specimens.

Male ( Fig. 3A View Fig. 3 )

MEASUREMENTS. Length: 9.50–11.50 mm; width: 2.25–2.75 mm.

BODY. Elongate, slightly flattened, elytra rather strongly narrowed posteriorly, covered with pale, elongate and decumbent setae.

HEAD. Eyes lateral, large, emarginate in front of antennal insertions, ratio of eye diameter to interocular space 1.0: 1.5–1.7. Antennae filiform, when directed backwards exceeding the humeri of elytra. Scape cylindrical, wider than other antennomeres, pedicel short, antennomere III–XI somewhat clavate, XI longest, length ca 4.5–4.6 times maximum width. Length ratio of antennomeres as follows: 1.90:1.00: 2.60:2.45: 2.30: 1.95: 1.85: 2.10:2.10: 1.90: 3.20. Apical maxillary palpomere securiform, apical margin moderately rounded, terminal angle somewhat obtuse. Surface lustrous, densely and coarsely punctate; interspaces slightly narrower than puncture diameter.

PRONOTUM. Truncate anteriorly, anterior edge slightly concave, bisinuate posteriorly, with obtuse median lobe, width ca 1.4–1.5 times as long as length, ca 1.6–1.7 times as wide as head. Lateral sides rounded and strongly narrowed in anterior two-thirds toward head, subparallel in posterior one-third, completely or almost completely margined. Anterior angle rounded; posterior angle rectangular and obtuse. Disc slightly flattened medially, surface lustrous, densely and coarsely punctate; spaces between punctures smaller than puncture diameter. Scutellum width ca 1.50–1.70 times length.

ELYTRA. Elongate, narrowed posteriorly, apex rounded, as wide as pronotal width at humeri, length ca 2.6–2.7 times width, surface lustrous. Disc covered with oval punctures, denser in lateral and basal part; interspaces wider than puncture diameter. Nine faint traces of striae in each elytron in dorsal view, stria I fused with II (numbered from suture to lateral side) ( Fig. 4A View Fig. 4 ), gradually shortened outwards; elytral striae indistinct in some specimens. Prosternum before procoxae about as long as shortest diameter of procoxae. Prosternal process long, margined laterally, long oval, extending well beyond procoxae; length behind procoxae longer than width between procoxae. Width between procoxae ca 0.2 times transverse coxa diameter. Mesoventrite with shallow, oval mesoventral cavity, moderately punctate. Abdominal ventrite V truncate, with lateral sides nearly straight ( Fig. 4G View Fig. 4 ); sternite VIII concave in middle of apical edge, forming two rounded lobes on both sides, moderately pubescent apically ( Fig. 5B View Fig. 5 ); sternite IX without spiculum gastrale on apical edge ( Fig. 5M View Fig. 5 ); tergite VIII without median strut on apical edge, rounded apically, moderately pubescent apically ( Fig. 5A View Fig. 5 ); tergite IX and X completely fused, rounded apically, densely pubescent on apical edge ( Fig. 5M View Fig. 5 ).

LEGS. Slender. Tarsomeres simple, tarsal formula 5-5-4. The longest spur of hind tibiae ca 0.3 times as long as first tarsal segment; length ratio of tarsomeres as follows: 2.30: 1.00: 0.55: 0.85 (measured without claws). Claws simple.

AEDEAGUS ( Fig. 6A–E View Fig. 6 ). Lanceloate, basal piece curved dorsally, lateral sides roundly arcuate, narrowed basically. Parameres narrowly separated apically with a groove in dorsal median part; lateral sides of the aedeagus almost straight, slightly constricted medially ( Fig. 6A–B View Fig. 6 ) or distinctly widened in middle ( Fig. 6C View Fig. 6 ), moderately narrowed apically, abruptly strongly narrowed at apex, length ca 3.3–3.5 times maximum width. Median lobe elongate, tapered, strongly narrowed in the apical half.

Female ( Fig. 3B View Fig. 3 )

MEASUREMENTS. Length: 10.00– 13.50 mm; width: 2.50–3.00 mm.

BODY. Similar to male.

HEAD. Eyes smaller than in male, ratio of eye diameter to interocular space 1.0: 1.9–2.0. Antennae shorter in male, when directed backwards extending the posterior edge of pronotum, antennomere XI ca 3.6–3.7 times as long as maximum width. Length ratio of antennomeres as follows: 1.50: 1.00: 2.85:2.00: 1.70: 1.90: 1.70: 1.75: 1.70:1.75: 2.85.

PRONOTUM. Ca 1.5 times wider than length, ca 1.7 times as wide as head.

ELYTRA. Slightly wider than in male, as wide as pronotal width at humeri, length ca 2.5–2.6 times width.

OVIPOSITOR. Paraproct elongate, ca 3.1–3.2 times length of coxite, sides straight and subparallel; proctiger subtruncate.

Notes

This species is fairly common in eastern North America, found on tree bark or attracted to light. It can also be collected using Malaise or Lindgren funnel traps. Larvae develop in the moist environment beneath the bark of decaying woods ( Payne 1931; Young 1991, 2002; Majka & Pollock 2006; Ślipiński & Lawrence 2010).

Distribution

Eastern North America: USA, Canada.

Table 2. Diagnostic characters among Synchroa Newman, 1838, Synchroina Fairmaire, 1898 and Thescelosynchroa gen. nov.

  Synchroa Synchroina Thescelosynchroa gen. nov.
Size Large Small Large
  (mostly 10.0–13.0 mm) (7.0–9.0 mm) (ca 10.0 mm)
Eyes Large; ratio of eye Small; ratio of eye diameter to interocular space in
  diameter to interocular males ca 1.8–2.2
  space in males ca    
  1.5–1.7    
Apical maxillary Securiform Obliquely truncate Securiform
palpomere
Shape of pronotum Lateral sides strongly Lateral sides Lateral sides feebly arcuate
  narrowed anteriorly somewhat rounded,  
    moderately narrowed  
    anteriorly  
Greatest width of As wide as elytra at humeri Distinctly narrower than
pronotum     elytra
Surface of Distinctly punctate Smooth Distinctly punctate
mesoventral cavity      
Claws Simple Serrate Simple
Aedeagal median Slender and tapered, Elongate and clavate, Elongate and clavate,
lobe not extending the apex not extending the apex extending from the apex of
  of the tegmen of the tegmen the tegmen
YHC

YHC

OKCZ

OKCZ

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Synchroidae

Loc

Thescelosynchroa

Hsiao, Yun, Ondřej Konvička & Chiun-Cheng Ko 2018
2018
Loc

Synchroa punctata

Newman 1838: 378
1838
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