Colombiathelphusa Campos & Magalhães, 2014, gen. nov.
Creators: name: Campos, Martha R.
name: Magalhães, Célio
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Pseudothelphusidae
Colombiathelphusa

description: Genus Colombiathelphusa gen. nov.
Diagnosis. Male first gonopod straight in caudal view, slightly curved towards cephalic side in lateral, mesial views, wider in the mid-distal portion; caudal ridge longitudinal, nearly straight, ending in narrow ridge distally; lateral process fairly well developed, rounded, extending from middle to subdistal portion of gonopod; cephalic surface with 2 subdistal spine-like processes; apex outline strongly recurved, like a bow's arch, elongated, with thick borders, bifid at lateral end, with internal acute spine, external spine rounded in distal view. Exognath of third maxilliped 0.60–0.63 times length of ischium.
Type species. Colombiathelphusa culmarcuata n. sp.
Etymology. The generic name refers to Colombia, the country with the richest fauna of freshwater crabs in the Neotropics and one of the most diverse in the world (Cumberlidge et al. 2009), and " Thelphusa " which is usually associated with freshwater crabs. The gender is feminine.
Remarks. Colombiathelphusa gen. nov. is included in Hypolobocerini Pretzmann, 1971 due to the characters of the third maxilliped (outer border of merus rounded; exopodite around 0.6 times length of ischium) and gonopod (apex elongated; apical field of spines in distal position, and lateral border with developed lobe distally).
The new genus resembles Hypolobocera Ortmann, 1897, Moritschus Pretzmann, 1965, and Lindacatalina Pretzmann, 1977, with respect to some characters of the gonopod: the stem recurved to cephalic direction in lateral view, the elongated apex, the field of apical spines in distal position, and the distinct lateral lobe on the distal half of the stem (best seen in caudal view). Colombiathelphusa gen. nov. differs from these genera by having two subdistal spine-like cephalic processes and the strongly recurved apex in a transverse plane. In the other two genera the subdistal portion of the cephalic surface is usually smooth, with no spine-like process, and the apex is usually oblong or subcircular in Lindacatalina, or nearly straight or just a little curved in Moritschus. In addition, the lateral end of the apex is bifid, whereas it is simple (either pointed or rounded) in the three similar genera. The elongated apex with a bifid lateral end, and the presence of mesial and lateral processes suggest a closer affinity with Ptychophallus Smalley, 1964. In Ptychophallus, however, the apex is strongly curved in the cephalic direction and the lateral process is usually bilobed, in addition to other differences in the mesial process (spine-like, partially displaced towards cephalic side in the new genus; usually broadly subtriangular in Ptychophallus) and the bifid lateral end of the apex (lateral end of apex usually rounded in Ptychophallus).
description: Published as part of Campos, Martha R. & Magalhães, Célio, 2014, Colombiathelphusa, a new genus of freshwater crab from Colombia, and the first location record of Eidocamptophallus chacei (Pretzmann, 1967) (Crustacea: Decapoda: Pseudothelphusidae), pp. 571-579 in Zootaxa 3860 (6) on page 572, DOI: 10.11646/zootaxa.3860.6.5, http://zenodo.org/record/228451