[Crustacea • 2022] Lobothelphusa bagoensis & L. thewanica • Two New Species of the Genus Lobothelphusa Bouvier, 1917 (Decapoda: Brachyura: Potamidae) from the Pegu Range, central Myanmar

Lobothelphusa bagoensis and L. thewanica

 Shi, Chen & Sun, 2022

 

 RAFFLES BULLETIN OF ZOOLOGY. 70; 

 Abstract

 The freshwater crab genus Lobothelphusa Bouvier, 1917, is known from five species (L. crenulifera, L. calva, L. barbouri, L. floccosa, and L. woodmasoni), which are mainly distributed in Myanmar (=Burma). In this study, we describe two new species, Lobothelphusa bagoensis and L. thewanica, from the Pegu Range in central Myanmar. Characters of the carapace and male first gonopod can clearly distinguish the two new species from their congeners. Molecular data derived from a partial sequence of the mitochondrial 16S rDNA support the systematic position of the new taxa. 

Key words. Crustacea, Potamidae, freshwater crab, taxonomy

 

Habitat and live colouration.
A–D, Lobothelphusa bagoensis, new species: A, habitat; B, paratype, ovigerous female (SEABRIDYX3); C, D, holotype, male (NNU16-DYX1).
E–G, Lobothelphusa thewanica, new species: E, habitat; F, G, holotype, male (NNU16-BG1).

SYSTEMATICS 

Superfamily Potamoidea Ortmann, 1896 

Family Potamidae Ortmann, 1896 

Subfamily Potaminae Ortmann, 1896 

Lobothelphusa Bouvier, 1917 

Lobothelphusa bagoensis, new species:
A, habitat; B, paratype, ovigerous female (SEABRIDYX3);
C, D, holotype, male (NNU16-DYX1). 

Lobothelphusa bagoensis, new species

Etymology. The new species is named after the administrative region in which the type locality is situated, Bago Division, Myanmar.  

Ecological note. These specimens were obtained from streams in hilly terrain and were dug out from mud burrows approximately 60–80 cm deep in well-drained, silty soil along the riparian zone (Fig. 7A). The eggs from three female individuals (NNU16-AG2, NNU16-AG3, SEABRI-AG4) were observed to be a bright yellow in colour and small in size (1.5–2.0 mm diameter) (Fig. 7B), and with each female carrying 253–374 eggs.

Lobothelphusa thewanica, new species:
E, habitat; F, G, holotype, male (NNU16-BG1).

Lobothelphusa thewanica, new species

Etymology. The species is named after the type locality, the township of Thewa, in the Pegu Range, Bago Division, Myanmar.  

Ecological note. Individuals were collected under stones and the layers of fallen leaves in the river or on its banks; the substrate consists mainly of stones and rocky rubble (Fig. 7E).  

Boyang Shi, Xiaoyong Chen and Hongying Sun. 2022. On Two New Species of the Genus Lobothelphusa Bouvier, 1917 (Decapoda: Brachyura: Potamidae: Potaminae) from the Pegu Range, central Myanmar.  RAFFLES BULLETIN OF ZOOLOGY. 70; 65–79.