Dorcadion pusillum vasiliscus

Dascălu, Maria-Magdalena, 2018, The subspecific structure of Dorcadion (Cribridorcadion) pusillum Küster (Coleoptera: Cerambycidae) with description of two new subspecies from Romania, Zootaxa 4442 (1), pp. 43-62: 55-59

publication ID

https://doi.org/10.11646/zootaxa.4442.1.2

publication LSID

lsid:zoobank.org:pub:96B3E263-7748-4F84-94E0-D03B89440EB1

persistent identifier

http://treatment.plazi.org/id/03A687E7-FFB9-574E-C8E1-F4BDFB53A0DC

treatment provided by

Plazi

scientific name

Dorcadion pusillum vasiliscus
status

ssp. nov .

Dorcadion pusillum vasiliscus  ssp. nov  .

Figs 1E View Figure , 2A View Figure , 4J–O View Figure , 5J, K View Figure , 6D, F–H View Figure .

Description. Male. Body length: 8.4–10.7 mm (n = 32); body width: 3.2–4.1 mm (n = 32). Body black. Antenna usually black, except sometimes basal half or more reddish-brown. Legs black to dark brown with tibiae reddishbrown basally and sometimes fore tibia almost entirely reddish. Pronotum 0.71–0.98× as wide basally as long (n = 32), with setiferous punctures distinctly separated mesally and denser and partly conjugated on sides; lateral tubercle small, with acute, moderately long spine. Pronotum dorsally with brown background pubescence, a median white stripe and sparse whitish pubescence laterally, mostly on tubercle. Elytra moderately convex, 1.73– 1.99× longer than wide (n = 32), with dense, fine microsculpture and sparse small setiferous punctures; punctuation deeper and denser on humeral depression. Humeral carina roughly sculptured basally and well visible in basal third of elytra. Background elytral pubescence blackish-brown. Humeral stripe reduced to a small humeral spot of white pubescence; exceptionally (one specimen) with sparse off-white setae towards apex of elytra ( Fig. 4N View Figure ). Dorsal stripe completely absent ( Fig. 4J–M, O View Figure ). Sutural stripe white. Small confluent spots of velvety black pubescence along sutural stripe form a subsutural stripe with irregular, sinuate border. Elytra without a mottled pattern as velvety black spots of pubescence on elytral disc absent ( Fig. 4J–O View Figure ). Lateral stripe similarly white on and above epipleuron, in most specimens not mottled. Endophallus with the same morphology as the nominal subspecies ( Fig. 6D, F–H View Figure ).

Female. Differs from male by larger size (body length 9.7–12.6 mm, n = 21), proportionately wider elytra, with more developed humeral and dorsal carinae; the pronotum with more prominent, sharper spines.

Androchrome females (with a male-like elytral pubescence pattern) ( Fig. 5J, K View Figure ) frequent. Autochrome females very rare ( Fig. 1E View Figure ). In these females background elytral pubescence brown, humeral and dorsal stripes light gray, without spots of black pubescence. Humeral stripe wider than dorsal (about as wide as interval between humeral and dorsal stripes or wider), both fused at elytral apex. Sutural stripe white. Subsutural stripe in form of small, more or less confluent spots of velvety black pubescence along sutural stripe.

Etymology. From the Romanian word vasilisc (Latin basiliscus), a legendary creature variously represented as a combination of a snake and a rooster. Noun in apposition. The general resemblance of D. pusillum vasiliscus  ssp. nov  . with other two species ( D. murrayi Küster  and D. axillare  ) inspired its name.

Remarks. The new subspecies does not have the elytral pubescence pattern of the nominal subspecies. Thus, males of D. p. vasiliscus  differ from those of D. p. pusillum  by the complete absence of the elytral stripes and black elytral spots and by their darker antenna. They differ from the geographically close D. p. ochrolineatum  by the white colour of the sutural and median pronotal stripes (pale yellow to rusty-yellow in D. p. ochrolineatum  ) and by the complete absence of the dorsal and humeral elytral stripes and black elytral spots. Males of D. p. vasiliscus  resemble those of D. p. tanaiticum  (located on the opposite extremity of the species distribution range) in the dark colour of background pubescence and the absence of the black elytral spots, but differ by the absence of humeral and dorsal elytral stripes which in D. p. tanaiticum  are present even if hardly visible ( Fig. 4P View Figure ). Also, in D. p. tanaiticum  , the subsutural stripe is visible only under certain angles of light.

By the elytral pattern of males, D. p. vasiliscus  ssp. nov  . resembles two other species from the same geographic area, D. murrayi  ( Fig. 2A, B View Figure ) and D. axillare  ( Fig. 6 View Figure in Dascălu & Fusu 2012). In all three taxa the males have elytra with uniform dark pubescence and without pale stripes except for the white sutural stripe. However, in the morphology of the endophallus ( Fig. 6A, B, D, F–K View Figure ) and other characters detailed in Table 2, the three mentioned taxa can be easily distinguished. Even if by external morphology D. p. vasiliscus  resembles D. murrayi  or D. axillare  , the endophallus of D. p. vasiliscus  is as in D. p. pusillum  ( Fig. 6C, D View Figure ).

In the pattern of the elytral stripes and background pubescence, the rare autochrome females of D. p. vasiliscus  ( Fig. 1E View Figure ) resemble those of D. murrayi  , D. a. axillare  and D. a. moldavicum Dascălu & Fusu; the androchrome females are also similar as discussed above for the males (compare Fig. 5J, K View Figure with Fig. 2C, D View Figure and Fig. 6 View Figure in Dascălu & Fusu 2012). The frequency of autochrome females further differentiates D. p. vasiliscus  from the other three subspecies of D. pusillum  . In this subspecies the vast majority of the females are androchrome, in D. p. pusillum  and D. p. ochrolineatum  androchrome females are extremely rare while in D. p. tanaiticum  the female is always autochrome ( Kasatkin 2002).

Distribution. Romania: Curvature Subcarpathians (Vrancea and Buzău counties) ( Fig. 7 View Figure ).

D. p. vasiliscus  ssp. nov  . D. murrayi  D. axillare 

body length: 8.4–10.7 mm (n = 32) body length: 11.3–14.5 mm (n = 27) body length: 9.6–14.3 mm (n = 79)

antenna black, except sometimes basal half antenna totally black antenna black with first joint lighter, or more, reddish-brown brownish-red

pronotum with sharp spines pronotum with more obtuse spines pronotum with sharp (ssp.

moldavicum) to blunt spines (nominal

subspecies)

elytra 1.73–1.96 times longer than wide elytra 1.95–2.29 times longer than elytra 1.71–2.09 times longer than wide (n=32) (except one with 1.99)* wide (n=27) (except one with 1.91)* (n=79)

elytra convex, with humeral carina visible in elytra dorsally flattened, with well elytra convex, with humeral carina the basal third developed humeral carina reaching visible in the basal third

almost to the apex

elytra with blackish-brown background elytra with blackish-brown elytra with pure black background pubescence background pubescence pubescence

humeral white spot present humeral spot absent or present humeral white spot present

subsutural stripe formed by confluent spots subsutural stripe in form of a black subsutural stripe absent of black pubescence band of pubescence

legs black to dark brown with tibiae reddish- legs black with tibiae reddish-brown legs brownish-red brown basally basally

medial tube basad of central bladder swollen a second smaller bladder absent a second smaller bladder absent forming a second smaller bladder

angle between central trunk and central central trunk is turned to the central angle between central trunk and central bladder obtuse, yet central bend distinct bladder at an acute angle hence central bladder obtuse and dorsal swelling very ( Fig. 6D View Figure ) bend very distinct ( Fig. 6A View Figure ) reduced hence central bend almost

indistinct ( Fig. 6B View Figure )

ventral swelling of central bladder simple, ventral swelling of central bladder ventral swelling of central bladder not bifid ( Fig. 6H View Figure ); dorsal swelling not bifid ( Fig. 6K View Figure ); dorsal swelling simple, not bifid ( Fig. 6B View Figure ); dorsal expanded ( Fig. 6G View Figure ) expanded laterally ( Fig. 6J View Figure ) swelling not expanded

apical bulb covered with larger microspines apical bulb covered with smaller apical bulb covered with smaller (about 21–25 µm) ( Fig. 6F, G View Figure ) microspines (about 14–19 µm) (Fig. microspines (about 14–17 µm)

6I, J)

(*) the difference between mean values statistically significant (t-test, p = 2.4×10-16)

Type material. Holotype, ♂: Romania, Vrancea, Beceni, Izvoru Dulce, mal Slănic peste râu [over Slănic river], 30.IV.2011, leg. Dascălu, Fusu & Chinan / Holotypus Dorcadion pusillum vasiliscus  ssp. nov  . Det. Dascălu M. M. 2016 [MDCO]. Paratypes: ROMANIA: Vrancea, Beceni, Izvoru Dulce, mal stâng, râu Slănic [left bank of Slănic river], 30.IV.2011, leg. Dascălu, Fusu & Chinan (18♂♂, 4♀♀ androchrome, 2♀♀ autochrome, one without head and pronotum, the other one abraded); Romania, Vrancea, Beceni, Izvoru Dulce, mal Slănic peste râu [over Slănic river], 30.IV.2011, leg. Dascălu, Fusu & Chinan (8♂♂, 3♀♀ androchrome); Romania, Buzău, Pădure Spătaru [Spătaru forest], 30.IV.2011, leg. Dascălu, Fusu & Chinan (36♂♂, 12♀♀ androchrome) and 26. IV.2017, leg. Fusu & Chinan (13♂♂); Romania, Buzău, Câlnău river, 29–30.IV.2011, leg. Dascălu, Fusu & Chinan (2♂♂, 2♀♀ autochrome, 2♀♀ androchrome); Romania, Buzău Co., Slănic river, near Aldeni, 30.IV.2011, leg. Dascălu, Fusu & Chinan (1♀ androchrome); Buzău, 2 km from Joseni village, on Sărăţel river border, 29.IV.2012, leg. Dascălu, Fusu, Chinan & Mânzu (5♂♂, 1♀ androchrome, 1♀ autochrome) [MDCO]; Dealul Balauru, la vest de [west of] Izvoru Dulce Beceni, Buzău, 15.IV.2002, leg. Viorel Ungureanu (1♀ autochrome) [MGAB, Nr. 206, Serafim coll.]; Pădure Spătaru, Costești (BZ), 12.V.1987, leg. N. Găldean (6♂♂, 1♀ autochrome) [MGAB, Nr. 199, Serafim coll.].

Abraded specimens excluded from the type series: La poalele Dealului Balauru , la vest de Izvoru Dulce Beceni, pe malul Slănicului , 12.V.2004, leg. Viorel Ungureanu (1♀ autochrome) [ MGABAbout MGAB, Nr. 206, Serafim coll.]  ; Roumanie, Cornurile Prahova, A. L. Montandon (1♀ autochrome, Fig. 1E View Figure ) [ MGABAbout MGAB, Nr. 199, Serafim coll.]  .

Comparative material of Dorcadion murrayi  . Romania: Vaslui Co., Gara Tălăşman, 4.VI.2003, leg. Dascălu M. M. (3♂♂)  ; Vaslui Co., Chirceşti , 27.IV.2006, leg. Dascălu, Fusu & Chinan (2♂♂)  ; Vaslui Co., Chiţcani , 11.V.2008, leg. Fusu & Chinan (8♂♂)  ; Vaslui Co., Gara Banca, 11.V.2008, leg. Dascălu, Fusu & Chinan (3♂♂)  ; Galaţi Co., Bălăbăneşti , 13.V.2008, leg. Fusu L. (2♂♂)  ; Vaslui Co., Gara Roşieşti, 29.V.2010, leg. Gherghel I. (1♂)  ; Buzău Co., Aldeni , 30.IV.2011, leg. Dascălu, Fusu & Chinan (1♂)  ; Buzău, Pădure Spătaru [ Spătaru forest ], 30.IV.2011, leg. Dascălu, Fusu & Chinan (4♂♂)  ; Buzău, 2 km from Joseni village , on 

Sărăţel river border, 29.IV.2012, leg. Dascălu, Fusu, Chinan & Mânzu (1♂)  ; Buzău Co., Pâclele, Berca , 29.IV.2012, leg. Dascălu, Fusu, Chinan & Mânzu) (1♂)  ; Dolj Co., Murta , 25.V.2013, leg. Iorgu I. (1♂). Comparative material of Dorcadion axillare  : specimens listed in Dascălu & Fusu (2012). 

MGAB

Muzeul de Istorie Naturala "Grigore Antipa"