Straneotia cylindroceps Erwin & Aldebron, 2018

Erwin, Terry L. & Aldebron, Charlotte, 2018, Neotropical Thoasia Liebke, 1939 and Straneotia Mateu, 1961 of the Cryptobatida group, subtribe Agrina: Taxonomic revisions with notes on their ways of life (Insecta, Coleoptera, Carabidae, Lebiini), ZooKeys 742, pp. 57-90 : 82-83

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Straneotia cylindroceps Erwin & Aldebron

sp. n.

Straneotia cylindroceps Erwin & Aldebron sp. n. Tube-headed slim arboreal carabid Figs 4A View Figure 4 , 6A View Figure 6 , 7 View Figure 7


(Female): Type locality. Ecuador, Orellana, Reserva Etnica Huaorani, 39 km S Pompeya, Estación Científica Yasuní, Onkone Gare Camp, Erwin Piraña Plot: transect 7, station 8, 0.6556°S, 76.4475°W, 220-250m, 7 October 1995 (TL Erwin, et al.)(NMNH: ADP100396).

Derivation of specific epithet.

The epithet, Straneotia cylindroceps , is a Latinized singular feminine adjective meaning "cylindrical head" referring to the shape of the elongate head behind the eyes.

Proposed English Vernacular Name.

Tube-headed slim arboreal carabid.


With the attributes of the genus and Straneotia freyi species group as described above and adults with subtle violaceous tint on elytra, each elytron with three slightly elongate discal spots and interval two contrastingly pale in basal half. Head behind eyes about 1.2 times more than length of eye.


(Figs 4A View Figure 4 , 6A View Figure 6 ). Habitus: (Fig. 4A View Figure 4 ). Size: See Appendix 1. Length (SBL) small for genus, ABL = 5.47-5.77 mm, SBL = 5.22-5.23 mm.

Color: See diagnosis above. Luster: Elytra with metallic violaceous highlights; forebody and head markedly shiny. Microsculpture: Elytron with mostly isodiametric and slightly stretched and moderately impressed sculpticells. Head and pronotum devoid of microsculpture. Head: Rugae of lateral occiput and neck mostly transverse, very finely etched; frons rugae more angulate. Eye not produced, barely convex. Antenna moderately long, reaching slightly behind humerus. Labrum small, rectangulate, shallowly emarginate. Neck finely transversely rugose at sides. Prothorax: Pronotum very narrow, cylindrical with slight lateral explanation; disc centrally narrowly planar with dense transverse rugae. Hind angles obtusely acute, base medially subtly produced. Pterothorax: Normal for Agrina , fully winged, wings clear. Elytron intervals 3, 5, and 7 with numerous discal setae, intervals slightly convex, side margin moderately explanate. Elytron moderately broad and short, moderately wider than the pronotum at the broadest part, apex obliquely truncate, markedly sinuate with distal corner obtusely rounded, disc not significantly convex, basal third slightly depressed. All interneurs well-impressed and micropunctate. Legs: Normal for Agrina , no unique modifications. Abdomen: Glabrous except normal ambulatory setae on sterna 3-5; female with two pairs of ambulatory setae on sternum VI. Male genitalia: Unknown. Female genitalia: (Fig. 6A View Figure 6 ). Ovipositor with broad spatulate laterotergite (lt) and two gonocoxites (gc 1, gc 2); gonocoxite 1 robust and apicolaterally aetose; gonocoxite 2 apically tapered, base (b) medium-size coequal in width with blade (bl) which is moderately elongate, apically obliquely narrowed and with several short robust and fine apical ensiform setae (des), several robust subapical ensiform setae, without ventral preapical nematiform setae. Reproductive tract proximally with moderately long, broad bursa copulatrix (bc), continuous at its distal end with common oviduct and long robust corrugated spermatheca (sp) distal to villous canal; spermathecal gland unknown (missing in dissection); spermathecal gland duct (sgd) very slim, attached to oviduct at base of its broadened portion.

Dispersal potential.

These beetles are macropterous and probably capable of flight.

Way of life.

Judging from the capture of the adults of new species, it is an arboreal species in rainforest canopies. The type and paratype were collected in February, the dry season in the Yasuní area of northeastern Ecuador. Members of this species have been recorded from the intersecting canopies of the following tree species using insecticidal fogging techniques: Lacistema nena cf.; Guatteria glaberrima cf.; Inga auristellae cf.; Iriartea deltoidea ; Eschweilera coriacea cf.; Warscewiczia cordata cf.; Virola obovata ; Astrocaryum murumuru var. urostachys ; Protium “grand” sp. n.

Other specimens examined.

Ecuador: Orellana, Reserva Etnica Huaorani, 39 km S Pompeya, Estación Científica Yasuní, Onkone Gare Camp , Erwin Pirana Plot : transect 8, station 3, 0.6551°S, 76.4403°W, 220-250m, 8 February 1996 (TL Erwin, et al.)(NMNH: ADP 138079, female paratype) GoogleMaps .

Geographic distribution.

(Fig. 7 View Figure 7 ). This species is currently known only from the type locality in the Yasuní area of northeastern Ecuador.


The holotype is held in trust at NMNH until the completion of our Cryptobatida Group studies and then will be deposited in Escuela Politécnica Nacional, Quito, Ecuador (MHNEPN).