Trapeziinae Miers, 1886

Ng, Peter K. L., Ahyong, Shane T. & Castro, Peter, 2023, Re-appraisal of the families and subfamilies of Trapezioidea Miers, 1886, with establishment of a new family, Ectaesthesiidae (Crustacea: Decapoda: Brachyura), Raffles Bulletin of Zoology 71, pp. 606-631 : 620

publication ID	https://doi.org/ 10.26107/RBZ-2023-0047
publication LSID	lsid:zoobank.org:pub:821BC4EC-5AF9-4727-84A3-C44839DFBE28
persistent identifier	https://treatment.plazi.org/id/038EC92D-797C-7E50-FF5C-6A452145FE52
treatment provided by	Felipe
scientific name	Trapeziinae Miers, 1886
status

Treatment

Subfamily Trapeziinae Miers, 1886 View in CoL

Trapeziinae Miers, 1886: 163 View in CoL (in part).

Diagnosis. Carapace trapezoidal, widest anteriorly; antero- and posterolateral margins usually clearly demarcated, sometimes merging gradually, anterolateral margin unarmed or with lateral tooth (excluding outer orbital tooth) ( Fig. 11A View Fig ); front entire to lobate and spinate; posterolateral margin gently concave to gently convex ( Fig. 11A View Fig ); carapace relatively low, dorsal surface gently convex in frontal view; posterior margin of epistome with median lobe distinct, lateral margin relatively short, gently concave, with 2 low triangular lobes, separated by V-shaped cleft from pterygostomial lobe ( Fig. 5B View Fig ). Basal antennal article quadrate, mobile, peduncle excluded from orbit. Maxilliped 3 merus quadrate, as wide as long, as wide as subrectangular ischium at midlength ( Fig. 6B View Fig ). Chelipeds long, slightly heterochelous to homochelous, larger cheliped length about twice carapace width; merus elongated, slender, with sharp spines or denticles on flexor margin; carpus inner angle with or without small spine ( Fig. 11A View Fig ). P2–5 long, longest pereopod shorter than 1.5 times carapace width; merus relatively stout ( Fig. 11A View Fig ). Male thoracic sternum wide, with sternopleonal cavity reaching anteriorly to level of midlength of anterior margin of P2 coxae ( Fig. 7C View Fig ); suture of male thoracic sternites 2, 3 usually visible, sometimes indistinct to absent ( Fig. 7C View Fig ); tubercle of male pleonal-locking mechanism distinct, on anterior third of thoracic sternite 5 or on its posterior edge near suture with sternite 6 ( Fig. 8H View Fig ). Male pleon relatively wide transversely, triangular, lateral margins of somites 3–6 converging, somites 3–5 fused with sutures undiscernible medially ( Figs. 7C View Fig , 8B View Fig ). G1 relatively stout, almost straight to slightly curved; distal margins lined with short spinules ( Fig. 9E View Fig ). G2 about one-third length of G1 ( Fig. 9F View Fig ). Vulva small, round, with flat lateral flexible sternal vulvar cover; vulvae positioned far apart ( Fig. 10C View Fig ).