Wednesday, June 29, 2016

[Crustacea • 2016] Macrobrachium spelaeus | กุ้งถ้ำพระวังแดง • A New Species of Stygobitic Freshwater Prawn (Decapoda: Palaemonidae) from northern Thailand

กุ้งถ้ำพระวังแดง | Macrobrachium spelaeus 
Cai & Vidthayanon, 2016


 A new species of stygobitic freshwater prawn, Macrobrachium spelaeus from Tham Phra Wang Daeng, Pitsanulok Province, in northern Thailand, is described and illustrated in detail. Morphological comparisons with allied epigean species M. dienbienphuense and known stygobitic congener M. poeti are given. The new species is characterised by its reduced eyes, smooth and slender second pereiopods, hairy chelae and short carpus of second pereiopods, and elongated telson.

Key words. New species, Macrobrachium, stygobitic, freshwater prawn, Thailand


Palaemonidae Rafinesque, 1815

Macrobrachium Bate, 1868
Macrobrachium spelaeus, new species

Colouration (live). Yellowish pale cephalothorax with pale yellow and brown visceral mass, rostrum translucent, eyes black, abdomen opaque with brownish hue dorsally. Hairs on chelae pale brown, antennas and appendages opaque.

Habitat. Macrobrachium spelaeus is known only from shallow (0.3–1 m depth) subterranean streams in the type locality, over 100 m from the cave entrance, at Tham Phra Wang Daeng of the Tham Phra Karst in Klong Chompu area of Thung Salaeng Luang National Park.

Etymology. The new species is named spelaeus (L., caved-welling), after its stygobitic habit.

Yixiong Cai and Chavalit Vidthayanon. 2016. Macrobrachium spelaeus, A New Species of Stygobitic Freshwater Prawn from Thailand (Decapoda: Palaemonidae).  RAFFLES BULLETIN OF ZOOLOGY. 64: 117–122. 

กุ้งถ้ำพระวังแดง  อีกหนึ่งชนิดใหม่ จากถ้ำพระวังแดง อช. ทุ่งแสลงหลวง พิษณุโลก ยังมีอีกหลาย species ที่ยังไม่มีการสำรวจในภูมินิเวศเขาหินปูนนี้