Cryptophagus vorontsovi Lyubarsky et Perkovsky, 2024
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publication ID |
https://doi.org/ 10.37828/em.2024.73.29 |
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publication LSID |
urn:lsid:zoobank.org:pub:2ED1F8FA-3A65-4CDD-8EEC-227D7F68B03F |
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persistent identifier |
https://treatment.plazi.org/id/5613720F-7D49-FFE3-FF4D-6C3A93DEFD49 |
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treatment provided by |
Felipe |
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scientific name |
Cryptophagus vorontsovi Lyubarsky et Perkovsky |
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Genus Cryptophagus Herbst, 1863 View in CoL
Cryptophagus vorontsovi Lyubarsky et Perkovsky , sp. nov.
https://zoobank.org/ urn:lsid:zoobank.org:act:20AEA081-7A42-4DD9-B75F-A3E1CA3C1A1D
( Figs 1–2 View Figure 1 View Figure 2 )
Type material. Holotype, SIZK UA-29727 , Rovno amber, late Eocene.
Syninclusions. SIZK UA-29728 : female of indet. Chironomidae with 11 eggs ; SIZK UA-29729 : Drepanosiphidae .
Etymology. Patronymic. Named for our dear colleague Dr. Dmitry D. Vorontsov (Koltzov Institute of Developmental Biology, Moscow, Russia).
Differential diagnosis. Cryptophagus vorontsovi sp. nov. appears similar to C. harenus Lyubarsky et Perkovsky, 2012 , but differs in the slightly elongated antennomeres 4 th and 5 th ( C. harenus : antennomere 4 th and 5 th subequal in length and width); the strongly transverse antennomeres 9 th and 10 th, almost twice as wide as long ( C. harenus : antennomeres 9 th and 10 th slightly transverse), the slightly convex pronotum ( C. harenus : strongly convex), the anterior margin of pronotum nearly straight ( C. harenus : anterior margin sinuate), the pronotum distinctly narrowed basally ( C. harenus : lateral margin of pronotum subparallel), the lateral tooth situated at middle of lateral pronotal margin ( C. harenus : far behind middle of lateral margin), the posterolateral angle of pronotum rectangular ( C. harenus : angle obtuse), the basal groove shallow ( C. harenus : groove deep), and the smaller body, about 2.6 mm long ( C. harenus : 3.1 mm).
Description. Body broadly elongate ( Fig. 1A View Figure 1 ), slightly convex dorsally; head, pronotum, and elytra brown to dark brown. Elytra slightly convex dorsally, covered with short, weakly semierect setation.
Head transverse, of normal size, with hemispherical, somewhat coarsely faceted eyes, moderately strongly and densely punctate (puncture diameter about as large as a facet). Frons slightly convex, without tubercles. Antennae long, slender ( Figs 1A, 1B View Figure 1 , 2B, 2C View Figure 2 ), with three-segmented club extending beyond pronotal base, antennomeres 1–5 elongate, antennomere 2 shorter than antennomere 3 ( Figs 1A View Figure 1 , 2 C View Figure 2 ), antennomeres 4 and 5 slightly elongated, antennomere 5 longer than 4, antennomeres 6 and 8 subequally long, antennomere 7 elongate, antennomeres 9 and 10 strongly transverse, almost twice as wide as long, terminal antennomere obliquely oval, with rounded apex.
Pronotum distinctly transverse, 1.3 times wider than long, with maximum width across midlength, slightly convex dorsally, moderately strongly and densely punctate (interspaces equal to punctures). Pronotum without sublateral line, distinctly narrowed basally, with a single lateral tooth. Lateral margins finely edged, anterior margin slightly convex ( Figs 1A View Figure 1 , 2 B View Figure 2 ), lateral margin not explanate, with edges visible from above along entire length. Callosity occupying most of anterior onefourth of lateral margin ( Figs 1A View Figure 1 , 2 B View Figure 2 ), with small, elongate-oval patch of glabrous surface invisible from above; caudolateral angles of callosity rectangular, callosity without spine. Lateral tooth situated at middle of lateral margin. Posterior angles of pronotum rectangular, posterior margin bisinuate, lobed, with shallow median depression ( Fig 1A View Figure 1 ) and two basal pits. Prosternum covered with coarse punctures.
Scutellar shield small, transverse, about twice wider than long, finely punctate. Elytra elongate-elliptical, moderately convex, with maximum width in anterior one-third, humeral angles rounded, shoulders little broader than maximum pronotal width, 1.5 times as long as wide and 2.6 times as long as pronotum, slightly flattened behind scutellar shield, with slightly rounded lateral margins and narrowly rounded apex. Elytral punctures irregular, coarse and rather dense; punctures in basal part about as large as pronotal punctures; interspaces equal to punctures. Elytral epipleura widest at humeri and gradually narrowing posteriorly, incomplete, extending about to posterior margin of abdominal ventrite 4. Metaventrite with disc slightly convex in ventral aspect; covered with coarse, rather dense punctures, apparently with weak discrimen in posterior half.
Legs slender, long, rather uniform in shape. Procoxae widely subelliptical, slightly transverse, separated by 0.75 procoxal length; mesocoxae hemispherical, separated by 1.35 mesocoxal length; metacoxae narrowly subelliptical, strongly transverse, separated by 1.2 metacoxal length. Femora elongate-elliptical, dilated medially, flattened. Tibiae slender, subparallel-sided, slightly dilated apically, subequal in length to corresponding femora. Tarsi long and slender; tarsomeres simple, not lobed; tarsal formula apparently 5–5–5.
Abdomen with five visible, freely articulated ventrites; ventrite 1 longest, covered with rather coarse punctures, without metafemoral lines; ventrites 2–5 with fine and denser punctures; ventrite 5 broadly rounded at posterior margin.
Length of body 2.6 mm, maximum width across elytra 1.3 mm. pronotum 0.7 mm long, 0.9 mm wide; elytra 1.8 mm long.
Remark. A large size of the amber piece, and the presence of an aphid syninclusion may indicate that the resinous trap was situated at base of the trunk ( Perkovsky 2010); chironomid female with many eggs in an abdomen likely was low-flying.
Among extant species, Cryptophagus vorontsovi sp. nov. is similar to С. dilutus Reitter, 1874. In C. vorontsovi , the tooth on the lateral edge of the pronotum is located in the middle of the length of the lateral edge; the callosity is large, with a clearly visible smooth platform, without a spine. In С. dilutus, in contrast to C. vorontsovi , the lateral edge of the pronotum is more angular, lateral pronotal tooth situated before in the middle and the pubescence on the elytra is more elevated.
| SIZK |
Schmaulhausen Institute of Zoology |
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