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| Lebbeus java
Komai, Chang & Chan, 2019
RAFFLES BULLETIN OF ZOOLOGY. 67
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Abstract
A new species of the thorid genus Lebbeus White, 1847, L. java new species, is described on the basis of two ovigerous female specimens from south of Java, Indonesia, collected at depths of 637–689 m. It is morphologically most similar to L. formosus Chang, Komai & Chan, 2010, known from off Taiwan, amongst about 70 congeners, but subtle morphological differences and genetic divergence estimated from the barcoding segments of the mitochondrial COI gene warrant the recognition of the new species. The new species is the third representative of Lebbeus from Indonesian waters.
Key words: COI barcode, SJADES 2018, Caridea, Alpheoidea, Lebbeus formosus
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| Fig. 5. Lebbeus java, new species, holotype, ovigerous female (cl 8.7 mm), MZB Cru 4923, habitus in lateral view, showing fresh colour. |
TAXONOMY
Family Thoridae Kingsley, 1879
Genus Lebbeus White, 1847
Lebbeus java new species
Diagnosis. Body surface glabrous. Rostrum straight, directed forward, reaching midlength of article 2 of antennular peduncle, approximately half length of carapace; dorsal margin armed with 3 or 4 moderately small teeth, including 1 or 2 postrostral; ventral margin armed with 4 small teeth in distal 0.3 on well developed lamina. Carapace with low postrostral ridge extending to at least midlength; supraorbital tooth arising at rostral base; orbital margin with deep notch just inferior to base of postorbital spine; suborbital lobe subtriangular, exceeding beyond antennal spine; anterolateral margin between antennal and small pterygostomial spine strongly sinuous. Pleura of anterior 4 pleomeres rounded, that of pleomere 5 with small posteroventral spine. Telson with 3 pairs of dorsolateral movable spines; convex posterior margin with 4 pairs of unequal spiniform setae. No ocellar spot on eye. Antennular peduncle article 1 with 2 or 3 spines on dorsodistal margin. Antennal carpocerite reaching midlength of scaphocerite; scaphocerite with distolateral spine reaching as far as rounded distal lamella. Strap-like, terminally hooked epipods on maxilliped 3 and pereopods 1–3. Maxilliped 3 overreaching scaphocerite by half length of ultimate article; ultimate article with short row of darkly pigmented spiniform setae on mesial margin distally. Pereopods 3 and 4 with dactyli approximately 0.2 times as long as propodi and bearing 5–7 small accessory spinules over entire length; meri of pereopods 3–5 with 3–5, 3–4 and 1 movable spines on lateral surface, respectively.
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Etymology. The species is named after the island of Java, on whose continental shelf the two specimens of the new species were collected. Used as a noun in apposition.
Distribution. Known only from the type locality, south of Java, Indonesia, at depths of 637–689 m.
Tomoyuki Komai, Su-Ching Chang and Tin-Yam Chan. 2019. A New Deep-sea Species of the Caridean Shrimp Genus Lebbeus White, 1847 (Crustacea: Decapoda: Thoridae) from southern Java, Indonesia. RAFFLES BULLETIN OF ZOOLOGY. 67: 150–159.
