Macrobrachium spelaeus, Cai & Vidthayanon, 2016

Cai, Yixiong & Vidthayanon, Chavalit, 2016, Macrobrachium spelaeus, a new species of stygobitic freshwater prawn from Thailand (Decapoda: Palaemonidae), Raffles Bulletin of Zoology 64, pp. 117-122 : 117-121

publication ID

https://doi.org/10.5281/zenodo.4502008

publication LSID

lsid:zoobank.org:pub:0ADEAACE-24DD-4535-9378-9DF50A432A8C

DOI

https://doi.org/10.5281/zenodo.4502012

persistent identifier

https://treatment.plazi.org/id/93B28A24-83DB-468F-94E5-5B91746EB857

taxon LSID

lsid:zoobank.org:act:93B28A24-83DB-468F-94E5-5B91746EB857

treatment provided by

Carolina (2021-02-04 17:12:47, last updated 2024-11-29 18:48:09)

scientific name

Macrobrachium spelaeus
status

sp. nov.

Macrobrachium spelaeus View in CoL , new species

( Figs. 1–3 View Fig View Fig View Fig )

Material examined. Holotype: male, cl 13.7 mm, ( NIFI SH 00176 View Materials ), Tham Phra Wangdaeng , Baan Chompu southwest of Thung Salaeng Luang National Park, Pitsanulok Province, lower north Thailand, 100 m. from the cave entrance: 16.8379°N 100.877°E, 28 August 2002, coll. C. Vidthayanon. GoogleMaps Paratypes: 1 male, cl 11.7mm ( OUMNH. ZC.2016-01-022) , 1 female, cl 11.9mm ( ZRC 2016.0049 View Materials ), same locality as holotype GoogleMaps .

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

Remarks. Mcrobrachium spelaeus , new species, represents the first stygobitic Macrobrachium species found in Thailand. With the existence of the tufts of velvety setae on the dactylus of second pereiopods, short carpus in second pereiopods, relatively short rostrum which does not exceed the end of the scaphocerite, Macrobrachium spelaeus , new species, should be referred to the Macrobrachium pilimanus species group (cf. Cai et al., 2004). To date, there are 15 species recognised in the Macrobrachium pilimanus group, namely M. pilimanus ( De Man, 1879) , M. leptodactylus ( De Man, 1892) , M. hirsutimanus ( Tiwari, 1952) , M. dienbienphuense Dang & Nguyen, 1972 , M. poeti Holthuis, 1984 , M. eriocheirum Dai, 1984 , M. ahkowi Chong & Khoo, 1987 [= M. johnsoni Chong & Khoo, 1987 ], M. gua Chong, 1989 , M. forcipatum Ng, 1995 , M. platycheles Ou & Yeo, 1995 , M. pilosum Cai & Dai, 1999 , M. amplimanus Cai & Dai, 1999 , M. sirindhorn Naiyanetr, 2001 , M. kelianense Wowor & Short, 2007 , and M. empulipke Wowor, 2010 . With its reduced eyes, M. spelaeus could be easily separated by all the other members of the M. pilimanus group except M. poeti . Macrobrachium poeti was described from several caves in Gunung Sewu, Java, Indonesia. Macrobrachium spelaeus could be distinguished from M. poeti (cf. Holthuis, 1984) by having more teeth on the lower margin of the rostrum (2 or 3 vs. 1 in M. poeti ); the shorter merus of the second pereiopods (as long as palm vs. distinctly longer than palm in M. poeti ); the larger number of teeth on the cutting edges of the fingers (15 vs. several in M. poeti ), the slender propodus in third pereiopods (3.4 times as long as dactylus vs.3 times in M. poeti ). Compared to epigean species of the group, M. spelaeus morphologically resembles M. dienbienphuense Dang & Nguyen, 1972 , a species originally described from northern Vietnam, but also reported from China, Laos, and Thailand ( Cai et al., 2004; Hanamura et al., 2011), especially when taking into account of the form of second pereiopods. Besides the eyes, M. spelaeus could be separated from M. dienbienphuense (cf. Dang & Nguyen, 1972; Cai et al. 2004, Hanamura et al. 2011) by the form of rostrum (straight vs. convex); shorter major second pereiopods in male specimens (as long as body length vs. distinctly longer in M. dienbienphuense ) less setae/pubescence in second pereiopods (see fig. 3 vs. fig. 3 in Dang & Nguyen 1972); fewer number of teeth on the cutting edges of the fingers (15 vs. 18–32 in M. dienbienphuense ).

Comparative specimens examined. Macrobrachium dienbienphuense : 10 males, cl 9.0–11.0 mm, 5 ovigerous females, cl 6.7–8.3 mm, eggs 1.3 × 1.0 mm ( ZRC 2000.2693 View Materials ), Central Thailand, Lop Buri Province, Chai Badan , coll. Y. Cai, 20 June 1998 ; 9 males, cl 10.2–11.7 mm, North-east Thailand, Phibun, Mangsahan, Ubon Rachathani Mae Nam Moon, Mangsahan afternoon market, coll. Y. Cai et al., 16 June 1998 .

Cai Y & Dai AY (1999) Freshwater shrimps (Crustacea: Decapoda: Caridea) from the Xishuangbanna region of Yunnan Province, southern China. Hydrobiologia, 400: 211 - 241.

Cai Y, Naiyanetr P & Ng PKL (2004) The freshwater prawns of the genus Macrobrachium Bate, 1868, of Thailand (Crustacea: Decapoda: Palaemonidae). Journal of Natural History, 38: 581 - 649.

Chong SSC (1989) A new species of freshwater prawn, Macrobrachium gua sp. nov. (Decapoda, Caridea, Palaemonidae) from Sabah, East Malaysia, Borneo. Crustaceana, 56 (1): 31 - 38.

Dai AY (1984) A preliminary study on the freshwater prawn genus Macrobrachium of China (Decapoda: Caridea). Acta Zootaxanomica Sinica, 9 (3): 244 - 252. [In Chinese with English summary].

Dang NT & Nguyen HY (1972) Dan lieu ve tom nuoc ngot giong Macrobrachium Bate (Palaemonidae) o cac thuy vuc vung nui mien bac Viet Nam (Faunistic study of freshwater prawn genus Macrobrachium Bate from mountainous region of North Vietnam). Tap san Sinh Vat-Dai Hoc, 10 (1 - 4): 1 - 6. [In Vietnamese with French summary].

De Man JG (1879) On some species of the genus Palaemon Fabr. with descriptions of two new forms. Notes from the Leyden Museum, 1 (41): 165 - 184.

De Man JG (1892) Decapoden des IndischenArchipels. In: Weber M, Zoologische Ergebnisseeiner Reise in Niederlandische Ost- Indien, 2: 265 - 527, pls. 15 - 29.

Hanamura Y, Imai H, Lasasimma O, Souliyamath P & Sayaka I (2011) Freshwater prawns of the genus Macrobrachium Bate, 1868 (Crustacea, Decapoda, Palaemonidae) from Laos. Zootaxa, 3025: 1 - 37.

Holthuis LB (1984) Freshwater prawns (Crustacea Decapoda: Natantia) from subterranean waters of the Gunung Sewu area, Central Java, Indonesia. Zoologische Mededelingen, Leiden, 58 (9): 141 - 148.

Naiyanetr P (2001) Macrobrachium sirindhorn n. sp., a new freshwater prawn from northern Thailand (Decapoda, Caridea, Palaemonidae). Crustaceana, 74 (7): 609 - 616.

Ng PKL (1995) Freshwater decapod crustaceans (Potamidae, Palaemonidae) of Temengor Forest Reserve, Hulu Perak, Malaysia. Malayan Naturalist Journal, 48: 249 - 257.

Ou ACT & Yeo DCJ (1995) A new species of freshwater prawn, Macrobrachium platycheles (Decapoda: Caridea: Palaemonidae) from Singapore and Peninsular Malaysia. Raffles Bulletin of Zoology, 43 (2): 299 - 308.

Tiwari KK (1952) Diagnosis of new species and subspecies of the genus Palaemon Fabricius (Crustacea: Decapoda). Annals and Magazine of Natural History, (12) 5: 27 - 32.

Wowor D & Short JW (2007) The new freshwater prawns of the genus Macrobrachium Bate, 1868 (Crustacea: Decapoda: Palaemonidae) from the Kelian River, East Kalimantan, Indonesia. Raffles Bulletin of Zoology, 55 (1): 77 - 87.

Wowor D (2010) Macrobrachium empulipke, a new freshwater prawn species (Decapoda, Palaemonidae) from Indonesia. In: Fransen CHJM, De Grave S & Ng PKL (eds.) Studies on Malacostraca: Lipke Bijdeley Holthuis Memorial Volume, Crustaceana Monographs, 14: 715 - 726.

Gallery Image

Fig. 1. Macrobrachium spelaeus, new species. A, B, cephalothorax; C, scaphocerite; D, antennal spine; E, epistome; F, fourth thoracic sternite; G, eighth thoracic sternum; H, 1st–3rd abdominal sterna with transverse ridge and median tooth; I, preanal carina; J, telson; K, uropodal diaeresis. Scale bars = 4 mm [A–C]; 1.5 mm [D]; 0.8 mm [E, H, I]; 1.2 mm [G, J]; 1.0 mm [F]; 0.5 mm [K] (holotype: male, cl 13.7 mm, NIFI SH 00176).

Gallery Image

Fig. 2. Macrobrachium spelaeus, new species. A, first pereiopods; B, C, second pereiopods; D, E, third pereiopods, Scale bars = 2 mm [A, C]; 4 mm [B]; 1.5 mm [D]; 0.5 mm [E] (holotype: male, cl 13.7 mm, NIFI SH 00176).

Gallery Image

Fig. 3. Colour photograph of Macrobrachium spelaeus, new species (paratype, male, cl 11.7mm, OUMNH.ZC.2016-01-022)

NIFI

National Inland Fisheries Institute

ZC

Zoological Collection, University of Vienna