Species New to Science

  Crustacea, Bac Kan Province, taxonomy, Potamiscinae, Tiwaripotamon edostilus, Tiwaripotamon pluviosum, Tiwaripotamon araneum, karsts

Khai DANG and Cuong DO. 2025. A New Species of Genus Tiwaripotamon Bott, 1970 (Crustacea, Decapoda, Brachyura, Potamidae) from northern Vietnam, with Notes on a similar species identified as “Tiwaripotamon araneum”  Zootaxa. 5631(3); 585-593. DOI: doi.org/10.11646/zootaxa.5631.3.11 [2025-05-05]

Diagnosis. G1 with large, roughly rounded, thick apical plate, widest medially; proximal lobe of apical plate subtriangular, well developed, situated on mesio-caudal side; distal margin straight, stretching diagonally over the distal lobe, fusing to mesiodistal portion of apical plate; distal lobe of apical plate broad, with lateral margin angulate in mesial view, caudal margin straight, distal margin slightly concave, mesial margin rounded, thick.

Etymology. The specific epithet refers to castra, the Latin word for military camp, in reference to the Brazilian Army battalion camp where this species was found.

YUAN Ziming, JIANG Wei and SHA Zhongli. 2025. A New Species of Gaillardiellus Guinot, 1976 (Crustacea, Brachyura, Xanthidae) from the coral reefs of the South China Sea. ZooKeys. 1234: 1-17. DOI: doi.org/10.3897/zookeys.1234.144026

Family Sesarmidae Dana, 1851 

Genus Geosesarma De Man, 1892 

Type species. Sesarma (Geosesarma) nodulifera De Man, 1892, 

subsequent designation by Serène & Soh (1970). 

Diagnosis. Carapace quadrate, as wide as long, adult width to length ratio ca. 1.0, lateral margins parallel (Figs. 2, 4A, B); dorsal surface with regions just visible, anterior regions with small, low rounded granules on gastric regions (Figs. 2C, D, 4A, B); front distinctly deflexed, 2 frontal lobes broad with almost straight margins in dorsal view; postfrontal, postorbital cristae sharp, distinct (Figs. 2C, D, 3A, 4A, B); external orbital tooth (= first lateral tooth) triangular, directed obliquely laterally, outer margin gently convex to almost straight, tip extending just beyond lateral margin; second lateral tooth low, distinct, separated from rest of margin by cleft (Figs. 2C, D, 4A, B). Merus of third maxilliped subovate, shorter than ischium; exopod slender ...

Etymology. The name is derived from a Malay term used to describe the “hidden people” of the forest or Orang Bunian. They are often described as beautifully dressed forest denizens. The name, bunian, here used as a Latin noun in apposition, alludes to the beautiful colours of the new species as well as it escaping scientific attention until now. 

Peter K. L. NG, S. KHADIJAH-AHMAD and Amirrudin B. AHMAD. 2025. On A New Species of Vampire Crab from the Geosesarma foxi species-group (Crustacea: Brachyura: Sesarmidae) in northern Peninsular Malaysia. RAFFLES BULLETIN OF ZOOLOGY . 73; 162–168.

A new species of the palaemonid genus Paraclimenes is described from relatively deep water in New Zealand. The new species can easily be distinguished from the only other two known species in the genus by the non-spatulate chela of the first pereiopod, the size of the uropods and the produced distal telson margin.

A new genus and species of the family Pseudocyclopidae, Sipadantonius roihani gen. et sp. nov., was described based on specimens collected using a light trap in the marine cave of Sipadan Island, Sabah, Malaysia. The new genus is most related to Pinkertonius, primarily based on the similarity observed in the armament of ancestral segment IV of the male antennules, the armament of the female P5 Exp-3, the segmentation of the male P5, the armament of the maxillular basal exite, and the relative length of the ancestral segment XXVII of the antennules. Nevertheless, it distinguishes itself from Pinkertonius and all other genera of the family by the absence of the lateral seta of the basis of all swimming legs, the presence of an inner seta on the coxa of the female P5, the reduction of furcal setae I and III, as well as the specific armament of the ancestral segment XX of the antennules and the maxillular coxal endite. The female of Sipadantonius roihani gen. et sp. nov. has aesthetascs on the ancestral segments IV and XX of the antennules, as well as six setae on the maxillular coxal endite, exhibiting the most plesiomorphic characteristics of the family Pseudocyclopidae. The latter characteristic has not been recorded in the order Calanoida. It was hypothesised that the new species was a particle feeder living in the pelagic zone of the marine cave. The existence of the new species supported the assumption that the regional distribution of the family Pseudocyclopidae exhibited the Tethyan track, which might have been the subsequent result of the colonisation of the habitats prior to the closure of the Tethys Sea.

Key words: Crustacea, Southeast Asia, systematics, taxonomy, Zooplankton

Chaichat Boonyanusith, Koraon Wongkamhaeng and Abdul-Rahim Azman. 2024. Sipadantonius roihani gen. et sp. nov., A New Genus and Species of Pseudocyclopidae Giesbrecht, 1893 (Copepoda, Calanoida) from the marine cave “Turtle Tomb” of Sipadan Island, Sabah, Malaysia. ZooKeys. 1219: 303-329. DOI: doi.org/10.3897/zookeys.1219.133132

Diagnosis: Clypeal region with lateral margin parallel, distal margin concave, apex narrowly acute, transversely rectangular (Figs 4C, 5C, 6C, 9A). Coxa of pereopod 7 narrows distally, curved posteriorly (Figs 5D, 6D, E, 9B). Distinct row of setae present between pleotelson spines; 11 upwardly curved pleotelson spines; pleotelson 0.6 as long as wide (Figs 5A, 9D); pleotelson vaulted laterally (Figs 6E, 9C). Appendix masculina slightly shorter than or reaching to end of endopod of pleopod 2 (Fig. 10A).