Thoasia surinamensis 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 : 66

Thoasia surinamensis Erwin & Aldebron sp. n. Suriname pentagonal arboreal carabid Figs 2A , 7

Holotype.

(Female): Type locality. Suriname, Saramacca, 5.8177°N, 55.5906°W, 15-25 September 2005 (G. J. Steck)(FSCA: ADP112239).

Derivation of specific epithet.

The epithet, Thoasia surinamensis , is a Latinized noun referring the type locality area of the species.

Proposed English Vernacular Name.

Suriname pentagonal arboreal carabid.

Diagnosis.

With the attributes of the genus and rugifrons species group as described above and adults with unicolorous ferrugineus head and pronotum, the latter with two longitudinal infuscated stripes from apex to base, elytra entirely dark olivaceous except translucent, narrowly explanate lateral margin, scutellum, meso-, and metathorax, and abdomen black, tibial and femoral apex infuscated.

Description.

(Fig. 2A ). Habitus: (Fig. 2A ). Size: See Appendix 1. Length (SBL) average for genus, ABL = 4.72 mm, SBL = 4.12 mm.

Color: See diagnosis above, and distal antennomers slightly infuscated. Luster: Elytra shiny olivaceous; forebody and head shiny. Microsculpture: Mostly isodiametric, well-impressed. Head: Rugae moderately coarse, mostly transverse on fore-occiput, longitudinal on aft-occiput and adjacent to eye, slightly angulate on frons. Eye large, sub-hemispheric, and evenly rounded anteriorly, subtly more prolonged posteriorly. Antenna moderately long, reaching humerus. Labrum very large, slightly cordate, shallowly convex at middle. Neck constricted, width coequal to anterior margin of pronotum. Prothorax: Pronotum moderately narrow, disc centrally convex with dense transverse rugae. Lateral margins at middle explanate and sharply acute then markedly arcuate to obtusely lobed hind angle; base subtly produced medially. Pterothorax: Normal for Agrina , fully winged, wings smoky translucent. Elytron intervals 3, 5, and 7 with numerous long discal setae, intervals slightly convex, side margin moderately explanate. Elytron moderately broad and short, moderately wider than the pronotum at the broadest part, apex truncate, slightly sinuate with distal corner obtusely rounded, disc not significantly convex, basal third not depressed. All interneurs well-impressed. Legs: Normal for Agrina , no unique modifications. Abdomen: Sparsely setiferous; normal ambulatory setae on sterna 3-5; female with three pairs of ambulatory setae on sternum 6; male unknown but probably with two pairs of longer setae on sternum 6, as in T. manu . Male genitalia: Unknown. Female genitalia: (cf. Fig. 2B ). Unstudied, but likely similar to T. manu .

Dispersal potential.

These beetles are macropterous and capable of flight. They are probably moderately swift and agile runners. The single specimen was collected in a malaise trap suspended at 6m up.

Way of life.

The holotype was active in September, the cooler minor wet season in Suriname.

Other specimens examined.

None.

Geographic distribution.

(Fig. 7 ). This species is currently known from the type locality in Suriname.

Figures

Figure 2. Digital Photo-illustrations. A Habitus, dorsal aspect: Thoasia surinamensis Erwin & Aldebron, sp. n., female, ADP 112239. Scale line = 1.00 mm B Female reproductive system dorsal aspect: Thoasia manu, Erwin & Aldebron, sp. n., ADP 100301. Legend, bc, bursa copulatrix; sg, spermathecal gland; sgd, spermathecal gland duct; sp., spermatheca; lt, laterotergite; co, common oviduct; gc 1, gonocoxite 1; gc 2, gonocoxite 2, des, dorsal ensiform seta, b, base of gonocoxite 2; bl, blade of gonocoxite 2. Scale bar: 0.50 mm.

Figure 7. Distribution map for known localities of Thoasia and Straneotia species.